2.4ghz-ifa-antenna

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2.4ghz-ifa-antenna

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Reusable 2.4 GHz Inverted-F PCB antenna designed for 50 Ω impedance. Optimized for FR-4 boards and edge placement in Wi-Fi and BLE applications. Includes Altium schematic symbol, footprint, and integrated library for ESP32, nRF24, and similar RF modules.

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# 2.4 GHz IFA PCB Antenna (50 Ω)

This repository provides a **reusable 2.4 GHz Inverted-F Antenna (IFA)** for PCB-based RF designs.  
The antenna is designed for **50 Ω impedance matching** and intended for Wi-Fi and BLE applications in embedded systems.

The goal of this project is to maintain a **standardized, reusable PCB antenna library** that can be integrated across multiple hardware designs without redesigning the antenna each time.

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## 📡 Antenna Specifications
- **Antenna Type:** Inverted-F Antenna (IFA)
- **Operating Frequency:** 2.4 – 2.5 GHz (ISM band)
- **Target Input Impedance:** 50 Ω
- **PCB Material:** FR-4
- **Feed Type:** Microstrip feed
- **Mounting:** On-board PCB antenna
- **Polarization:** Linear

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## 📁 Repository Structure
- **Altium Schematic Symbol**
- **Altium PCB Footprint**
- **Integrated Library (.IntLib)**
- **Ground keep-out & placement guidelines**
- **Matching and tuning notes**
- **Reference usage information**

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## 📐 PCB Layout Guidelines
To achieve optimal antenna performance:
- Place the antenna at the **edge of the PCB**
- Maintain a **ground and copper keep-out region** beneath the antenna
- Route the RF feed using a **50 Ω controlled-impedance microstrip**
- Avoid vias, copper pours, or high-speed signals near the antenna
- Keep nearby components and metal objects away from the antenna region
- Provide a **π-matching network footprint** close to the RF feed for tuning

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## 🔧 Impedance Matching
- Designed for **nominal 50 Ω**
- Final impedance may vary depending on:
  - PCB dimensions
  - Ground plane size
  - Stack-up and dielectric thickness
  - Enclosure and nearby materials
- Matching components allow fine tuning during validation

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## 🧪 Intended Platforms
- ESP32
- nRF24L01
- Other 2.4 GHz Wi-Fi / BLE transceivers

---

## ⚠ Important Notes
- Antenna performance is **highly layout-dependent**
- Production designs should be verified using **VNA / S11 measurements**
- Minor tuning is expected for different PCB form factors

---

## 🛠 Tools Used
- Altium Designer
- FR-4 PCB stack-up assumptions

---

## 📜 License
This project is released under the **MIT License**.  
You are free to use, modify, and include this antenna in commercial designs.

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