NFC Antenna Coil Generator

Overview

This script automates the process of computing the necessary parameters for an NFC antenna coil based on a specified capacitance. It generates the following files:

• An image of the computed coil geometry.
• A KiCad footprint (.kicad_mod) for use in PCB designs.
• A DXF file (.dxf) for 2D CAD software.
• An SVG file (.svg) for vector-based graphic design or other use cases.

Features

• Automatic coil computation: Computes the optimal antenna coil geometry based on the resonant frequency and a given capacitance value.
• File generation: Generates the coil in multiple formats:
  • KiCad footprint module (.kicad_mod)
  • DXF file (.dxf)
  • SVG file (.svg)
  • Coil image plot.

Installation

To run this script, you'll need the following dependencies:

• Python 3.x
• NumPy
• Matplotlib

You can install the required Python libraries with:

pip install numpy matplotlib
pip install numpy

Usage

First you need to adapt the constants based on your requirements. The following parameters can be adjusted:

CAPACITANCE_CHIP = 28.5e-12 # 28.5 pF
RESONANT_FREQUENCY = 13.56e6 # 13.56 MHz

DEFAULT_MIN_LENGTH = 10
DEFAULT_MAX_LENGTH = 25
DEFAULT_STEP_LENGTH = 0.01

DEFAULT_MIN_TURNS = 5
DEFAULT_MAX_TURNS = 20
DEFAULT_STEP_TURNS = 1

DEFAULT_MIN_WIDTH = 0.25
DEFAULT_MAX_WIDTH = 1.0
DEFAULT_STEP_WIDTH = 0.05

DEFAULT_MIN_SPACING = 0.25
DEFAULT_MAX_SPACING = 1.0
DEFAULT_STEP_SPACING = 0.05

Then run the code with:

python3 main.py

example of output