NFC Rectangular Antenna Calculator

This page describes an NFC antenna calculator specifically for rectangular shapes. It outlines the formulas used to calculate the inductance of an NFC rectangular antenna. Links to other helpful antenna calculators are also provided.

NFC Antenna Calculator and Example

Here’s an example demonstrating how to use the NFC rectangular antenna calculator:

INPUTS:

• a0 = 35 mm
• b0 = 25 mm
• w = 0.2 mm
• g = 0.2 mm
• t = 0.035 mm
• N = 3
• E = 1.65

OUTPUTS:

• Equivalent conductor diameter = 0.094
• Average length (a avg ) = 33.82 mm
• Average Width (b avg ) = 23.83 mm
• Inductance = 0.7127 µH

Mils to mm Conversion Example

Here’s a simple example showing how to convert mils to mm:

• INPUT: mils = 8
• OUTPUT: mm = 0.2

Formula: 1 mm (millimeter) = 39.37 mils

Formulas Used in the NFC Rectangular Antenna Calculator

The following formulas are used in this NFC rectangular antenna calculator:

This NFC rectangular antenna calculator is a useful tool for designing NFC loop antennas.