Freelancer logo
Log In Sign Up
Post a Project

EXPLORE

Antenna Design Circuit Design Electronics PCB Layout Product Design
Profile cover photo
User Avatar

Nada

@rfandelectronics

monthly-level-three.svg
5.0
3

2.5

2.5

100%

RF/Antenna/PCB/Electronics/Embedded system design

$20 USD / Hour

・

Flag of EGYPT

Egypt (8:54 PM)

・

Joined on January 21, 2026

・

2 Recommendations

$20 USD / Hour

・

We are RF & Electronics Engineers specialized in high-frequency systems, microwave engineering, and advanced electronic design. Our expertise covers the complete development cycle — from concept and simulation to hardware implementation and system integration. We specialize in: * RF & Microwave Circuit Design * Antenna Design & Simulation * Radar Systems Engineering * High-Frequency PCB Design * Electromagnetic Simulation using CST Microwave Studio & ANSYS HFSS * Embedded Systems Development (Arduino, ESP, C/C++) * PCB Design using KiCad , Proteus and Altium designer * MATLAB-based Modeling & Signal Processing In addition to engineering development, we actively contribute to academic research and postgraduate studies, including: * Master’s & PhD Research Support in RF, Microwave & Antenna Engineering * Thesis Design, Simulation & Experimental Validation * Research Paper Preparation & Technical Modeling * Academic Supervision & Technical Consulting We also provide professional training courses in: * RF & Microwave Engineering * Antenna Design & EM Simulation (CST & HFSS) * Radar Systems Fundamentals & Applications * High-Frequency PCB Design * Embedded Systems Programming With a strong background in RF systems and microwave engineering, we focus on delivering high-performance, optimized, and reliable solutions for communication, radar, and embedded electronic applications. We combine theoretical knowledge with practical implementation to transform complex RF challenges into efficient real-world systems.

Verifications

On time

100%

On budget

100%

Accept rate

100%

Repeat hire rate

25%

Freelancer Electronics Engineers Egypt
See all Electronics Engineers in Egypt

Portfolio

Portfolio

14075350
? Integrating AI with Antenna Design: From Simulation to Smart Prediction! ?✨I’m excited to share my latest project: The design and development of a Frequency-Reconfigurable Antenna using PIN Diodes, coupled with a Machine Learning (ML) model to accelerate and optimize the design process!? Key Highlights of the Project:Electromagnetic Simulation & Analysis (CST Studio Suite):Designed the antenna geometry and integrated PIN Diode switches to dynamically control resonance frequencies.Evaluated $S_{11}$ Return Loss parameters to ensure high performance across multiple frequency bands.Smart AI Tool (Antenna AI Designer):Forward Mode (Dimensions $\rightarrow$ Frequencies): Predicts center frequencies, bandwidth, and return loss based on diode states and patch dimensions, eliminating the need for time-consuming full-wave simulations.Inverse Mode (Frequencies $\rightarrow$ Dimensions): Recommends the optimal antenna dimensions and diode states required to achieve target operational freque

? Reconfigurable Multiband Antenna

? Integrating AI with Antenna Design: From Simulation to Smart Prediction! ?✨I’m excited to share my latest project: The design and development of a Frequency-Reconfigurable Antenna using PIN Diodes, coupled with a Machine Learning (ML) model to accelerate and optimize the design process!? Key Highlights of the Project:Electromagnetic Simulation & Analysis (CST Studio Suite):Designed the antenna geometry and integrated PIN Diode switches to dynamically control resonance frequencies.Evaluated $S_{11}$ Return Loss parameters to ensure high performance across multiple frequency bands.Smart AI Tool (Antenna AI Designer):Forward Mode (Dimensions $\rightarrow$ Frequencies): Predicts center frequencies, bandwidth, and return loss based on diode states and patch dimensions, eliminating the need for time-consuming full-wave simulations.Inverse Mode (Frequencies $\rightarrow$ Dimensions): Recommends the optimal antenna dimensions and diode states required to achieve target operational freque

? Reconfigurable Multiband Antenna

14029527
4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

14029523
? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

14028151
This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

13871385
? Progress Update: Reconfigurable Rectangular Patch Antenna Design for WiFi 7 Applications I’m excited to share the latest milestone in my ongoing project — a novel reconfigurable rectangular patch antenna designed on Rogers RO5880 substrate (εᵣ = 2.2, tanδ = 0.0009, h = 1.575 mm). The antenna features a main rectangular patch with crossed slots and an inset microstrip feed. This structure was simulated in CST Microwave Studio to achieve frequency agility through PIN diode switching. Current Simulation Results (without PIN diodes): Strong resonance observed around 3.7 GHz with S11 ≈ -14 dB Excellent deep resonance at 4.8 GHz with S11 reaching -28 dB Additional minor dip near 6 GHz These results demonstrate promising multi-resonant behavior, making the base structure an excellent foundation for further reconfigurability. Next Steps: I will now integrate 8 PIN diodes: 4 diodes placed strategically within the crossed slots to enable frequency reconfiguration. 4 additional diodes connec

Reconfigurable Rectangular Patch Ant

? Progress Update: Reconfigurable Rectangular Patch Antenna Design for WiFi 7 Applications I’m excited to share the latest milestone in my ongoing project — a novel reconfigurable rectangular patch antenna designed on Rogers RO5880 substrate (εᵣ = 2.2, tanδ = 0.0009, h = 1.575 mm). The antenna features a main rectangular patch with crossed slots and an inset microstrip feed. This structure was simulated in CST Microwave Studio to achieve frequency agility through PIN diode switching. Current Simulation Results (without PIN diodes): Strong resonance observed around 3.7 GHz with S11 ≈ -14 dB Excellent deep resonance at 4.8 GHz with S11 reaching -28 dB Additional minor dip near 6 GHz These results demonstrate promising multi-resonant behavior, making the base structure an excellent foundation for further reconfigurability. Next Steps: I will now integrate 8 PIN diodes: 4 diodes placed strategically within the crossed slots to enable frequency reconfiguration. 4 additional diodes connec

Reconfigurable Rectangular Patch Ant

13802217
Successfully designed and simulated a rectangular microstrip patch antenna operating at 2.4 GHz with the following performance: ? Resonant Frequency: 2.4 GHz ? S11 (Return Loss): Below -50 dB at resonance ? Optimized Bandwidth around the target frequency ? Directivity: ≈ 6.9 dBi ⚡ Stable Radiation Pattern suitable for ISM / WiFi applications Design Process Included: ✔️ Theoretical dimension calculations ✔️ Impedance matching optimization ✔️ Return loss enhancement ✔️ Full far-field radiation analysis Suitable for: WiFi systems IoT applications Embedded wireless solutions Short-range communication systems ? Custom antenna design services available based on required frequency and application.

? Microstrip Patch Antenna Design

Successfully designed and simulated a rectangular microstrip patch antenna operating at 2.4 GHz with the following performance: ? Resonant Frequency: 2.4 GHz ? S11 (Return Loss): Below -50 dB at resonance ? Optimized Bandwidth around the target frequency ? Directivity: ≈ 6.9 dBi ⚡ Stable Radiation Pattern suitable for ISM / WiFi applications Design Process Included: ✔️ Theoretical dimension calculations ✔️ Impedance matching optimization ✔️ Return loss enhancement ✔️ Full far-field radiation analysis Suitable for: WiFi systems IoT applications Embedded wireless solutions Short-range communication systems ? Custom antenna design services available based on required frequency and application.

? Microstrip Patch Antenna Design

Successfully designed and simulated a rectangular microstrip patch antenna operating at 2.4 GHz with the following performance: ? Resonant Frequency: 2.4 GHz ? S11 (Return Loss): Below -50 dB at resonance ? Optimized Bandwidth around the target frequency ? Directivity: ≈ 6.9 dBi ⚡ Stable Radiation Pattern suitable for ISM / WiFi applications Design Process Included: ✔️ Theoretical dimension calculations ✔️ Impedance matching optimization ✔️ Return loss enhancement ✔️ Full far-field radiation analysis Suitable for: WiFi systems IoT applications Embedded wireless solutions Short-range communication systems ? Custom antenna design services available based on required frequency and application.

? Microstrip Patch Antenna Design

14075350
? Integrating AI with Antenna Design: From Simulation to Smart Prediction! ?✨I’m excited to share my latest project: The design and development of a Frequency-Reconfigurable Antenna using PIN Diodes, coupled with a Machine Learning (ML) model to accelerate and optimize the design process!? Key Highlights of the Project:Electromagnetic Simulation & Analysis (CST Studio Suite):Designed the antenna geometry and integrated PIN Diode switches to dynamically control resonance frequencies.Evaluated $S_{11}$ Return Loss parameters to ensure high performance across multiple frequency bands.Smart AI Tool (Antenna AI Designer):Forward Mode (Dimensions $\rightarrow$ Frequencies): Predicts center frequencies, bandwidth, and return loss based on diode states and patch dimensions, eliminating the need for time-consuming full-wave simulations.Inverse Mode (Frequencies $\rightarrow$ Dimensions): Recommends the optimal antenna dimensions and diode states required to achieve target operational freque

? Reconfigurable Multiband Antenna

? Integrating AI with Antenna Design: From Simulation to Smart Prediction! ?✨I’m excited to share my latest project: The design and development of a Frequency-Reconfigurable Antenna using PIN Diodes, coupled with a Machine Learning (ML) model to accelerate and optimize the design process!? Key Highlights of the Project:Electromagnetic Simulation & Analysis (CST Studio Suite):Designed the antenna geometry and integrated PIN Diode switches to dynamically control resonance frequencies.Evaluated $S_{11}$ Return Loss parameters to ensure high performance across multiple frequency bands.Smart AI Tool (Antenna AI Designer):Forward Mode (Dimensions $\rightarrow$ Frequencies): Predicts center frequencies, bandwidth, and return loss based on diode states and patch dimensions, eliminating the need for time-consuming full-wave simulations.Inverse Mode (Frequencies $\rightarrow$ Dimensions): Recommends the optimal antenna dimensions and diode states required to achieve target operational freque

? Reconfigurable Multiband Antenna

14029527
4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

4-Channel Over/Under Voltage Protection Circuit Smart protection board using LM324 that monitors voltage on 4 separate channels and cuts the output instantly if voltage goes too high or too low. • Adjustable threshold via potentiometers (RV1–RV4) • 4 status LEDs (Red = Fault | Green = Normal) • Powerful transistor outputs • PWR_FLAG signal for microcontroller connection Fully designed in KiCad – clean schematic, professional PCB, and nice 3D render. Perfect for protecting motors, power supplies, batteries, or any sensitive loads. #PCB #electronics #RF #microwave #power

4-Channel Over/Under Voltage Protect

14029523
? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

? Professional 2.4 GHz RF Power Amplifier Project Completed! ? We’ve just finalized an advanced Power Amplifier design utilizing the TQP7M9103 IC, optimized specifically for the 2.4 GHz frequency band. Project Overview: • Objective?: Amplify weak 2.4 GHz input signals with high efficiency, strong gain, and minimal distortion while preserving excellent signal quality. • Design?: Professional high-frequency PCB layout featuring precise routing, accurate impedance matching, power integrity optimization, and RF best practices. In addition, full electromagnetic simulation and in-depth analysis of S-Parameters (S11, S21, S12, S22) along with radiation characteristics. Key focus areas: •1️⃣ Highly accurate input/output Matching Networks •2️⃣Minimizing losses and reflections •3️⃣Effective Thermal Management •4️⃣Compact and practical layout suitable for real-world applications such as WiFi, IoT, and wireless communication systems. Result ✅: A high-performance design that achieves professional

Professional 2.4 GHz RF Power Amplif

14028151
This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

This system is a complete portable potentiostat capable of performing electrochemical analysis such as voltammetry and amperometry. It is designed for field or lab use in applications like biosensors, environmental monitoring, and point-of-care diagnostics. Key Features • Power Management: • USB Type-B 5V input with TP4056 lithium battery charger • Seamless switching between USB and battery power • 3.3V linear regulator with proper decoupling and protection • Main Controller: • ESP32 Pico D4 microcontroller • WiFi & Bluetooth connectivity for wireless data transmission • I2C, ADC, DAC, and UART interfaces fully utilized • Core Sensing Block: • LMP91000 – Highly integrated, low-power potentiostat AFE • Supports 3-electrode configuration (Working, Reference, Counter) • Configurable via I2C from the ESP32 • Ideal for low-current electrochemical measurements • User Interface & Expansion: • External ADC and DAC channels available • Status LED • Connecto

Industrial PCB Design

13871385
? Progress Update: Reconfigurable Rectangular Patch Antenna Design for WiFi 7 Applications I’m excited to share the latest milestone in my ongoing project — a novel reconfigurable rectangular patch antenna designed on Rogers RO5880 substrate (εᵣ = 2.2, tanδ = 0.0009, h = 1.575 mm). The antenna features a main rectangular patch with crossed slots and an inset microstrip feed. This structure was simulated in CST Microwave Studio to achieve frequency agility through PIN diode switching. Current Simulation Results (without PIN diodes): Strong resonance observed around 3.7 GHz with S11 ≈ -14 dB Excellent deep resonance at 4.8 GHz with S11 reaching -28 dB Additional minor dip near 6 GHz These results demonstrate promising multi-resonant behavior, making the base structure an excellent foundation for further reconfigurability. Next Steps: I will now integrate 8 PIN diodes: 4 diodes placed strategically within the crossed slots to enable frequency reconfiguration. 4 additional diodes connec

Reconfigurable Rectangular Patch Ant

? Progress Update: Reconfigurable Rectangular Patch Antenna Design for WiFi 7 Applications I’m excited to share the latest milestone in my ongoing project — a novel reconfigurable rectangular patch antenna designed on Rogers RO5880 substrate (εᵣ = 2.2, tanδ = 0.0009, h = 1.575 mm). The antenna features a main rectangular patch with crossed slots and an inset microstrip feed. This structure was simulated in CST Microwave Studio to achieve frequency agility through PIN diode switching. Current Simulation Results (without PIN diodes): Strong resonance observed around 3.7 GHz with S11 ≈ -14 dB Excellent deep resonance at 4.8 GHz with S11 reaching -28 dB Additional minor dip near 6 GHz These results demonstrate promising multi-resonant behavior, making the base structure an excellent foundation for further reconfigurability. Next Steps: I will now integrate 8 PIN diodes: 4 diodes placed strategically within the crossed slots to enable frequency reconfiguration. 4 additional diodes connec

Reconfigurable Rectangular Patch Ant

13802217
Successfully designed and simulated a rectangular microstrip patch antenna operating at 2.4 GHz with the following performance: ? Resonant Frequency: 2.4 GHz ? S11 (Return Loss): Below -50 dB at resonance ? Optimized Bandwidth around the target frequency ? Directivity: ≈ 6.9 dBi ⚡ Stable Radiation Pattern suitable for ISM / WiFi applications Design Process Included: ✔️ Theoretical dimension calculations ✔️ Impedance matching optimization ✔️ Return loss enhancement ✔️ Full far-field radiation analysis Suitable for: WiFi systems IoT applications Embedded wireless solutions Short-range communication systems ? Custom antenna design services available based on required frequency and application.

? Microstrip Patch Antenna Design

Successfully designed and simulated a rectangular microstrip patch antenna operating at 2.4 GHz with the following performance: ? Resonant Frequency: 2.4 GHz ? S11 (Return Loss): Below -50 dB at resonance ? Optimized Bandwidth around the target frequency ? Directivity: ≈ 6.9 dBi ⚡ Stable Radiation Pattern suitable for ISM / WiFi applications Design Process Included: ✔️ Theoretical dimension calculations ✔️ Impedance matching optimization ✔️ Return loss enhancement ✔️ Full far-field radiation analysis Suitable for: WiFi systems IoT applications Embedded wireless solutions Short-range communication systems ? Custom antenna design services available based on required frequency and application.

? Microstrip Patch Antenna Design

Successfully designed and simulated a rectangular microstrip patch antenna operating at 2.4 GHz with the following performance: ? Resonant Frequency: 2.4 GHz ? S11 (Return Loss): Below -50 dB at resonance ? Optimized Bandwidth around the target frequency ? Directivity: ≈ 6.9 dBi ⚡ Stable Radiation Pattern suitable for ISM / WiFi applications Design Process Included: ✔️ Theoretical dimension calculations ✔️ Impedance matching optimization ✔️ Return loss enhancement ✔️ Full far-field radiation analysis Suitable for: WiFi systems IoT applications Embedded wireless solutions Short-range communication systems ? Custom antenna design services available based on required frequency and application.

? Microstrip Patch Antenna Design

5.0 · 3 Reviews
3 Reviews
S
Flag of BAHRAIN

Sharif

5.0

$15 USD

1 month ago

3–3.5 GHz Rectangular Patch Antenna

professional team working in RF and PCB designs. Very clever in their work and deliver the required deliverables in time.

Electronics
Matlab and Mathematica
Electrical Engineering
Antenna Design
Signal Processing

+1 more

Share

S
Flag of INDIA

Ravi

5.0

$10 USD

2 months ago

Quick KiCad PCB Revisions

Excellent freelancer. He understood my requirements well, communicated promptly, and was patient while PCB design. He incorporated all the requirements, including JLCPCB PCBA compatibility, component selection, and layout. He delivered the required Gerber, BOM, and related files on time. I am satisfied with the quality of the work and would be happy to work with him again.

Electronics
Electrical Engineering
PCB Layout
Circuit Design
Embedded Systems

+1 more

Share

Education

Cairo University

2016 - 2021

•

5 years

bachelor

Flag of EGYPT

Egypt

2016 - 2021

•

5 years

Certifications

P

Preferred Freelancer Program SLA

Freelancer logo US (International) / English
Help & Support

Freelancer

Categories Projects Contests Freelancers Enterprise Innovation Challenges AI Development Membership Preferred Freelancer Program Project Management Local Jobs Photo Anywhere Showcase API for Developers Get Verified

About

About us How it Works Security Investor Sitemap Stories News Team Awards Press Releases Careers

Terms

Privacy Policy Terms and Conditions Copyright Policy Code of Conduct Fees and Charges

Partners

Escrow.com Loadshift Warrior Forum

Apps

Apple App Store logoGoogle Play logo

Registered Users

Total Jobs Posted

Freelancer ® is a registered Trademark of Freelancer Technology Pty Limited (ACN 142 189 759)

Copyright © 2026 Freelancer Technology Pty Limited (ACN 142 189 759)