Calculator — Inset Fed Patch Antenna

To design an inset fed patch antenna, the following parameters need to be considered:

When using an online calculator or building a spreadsheet, you must provide the following:

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(using simpler formula for demonstration) [ R_\textin(0) \approx 90\frac4.4^24.4-1\left(\frac28.437.3\right)^2 \approx 90\times\frac19.363.4\times0.58 \approx 297\ \Omega ]

If you are designing multiple patch antennas for an array (e.g., 2x2 or 4x4 phased array), manual entry becomes tedious. Consider these advanced options: To design an inset fed patch antenna, the

Inset feed at ( y_0 = 10.4 ) mm from the patch edge, centered along the width.

At the exact center of the patch, the voltage is zero (for the fundamental TM010 mode), so the resistance ideally drops to 0 Ω. Therefore, somewhere between the edge (high Z) and the center (0 Ω) lies a point where the impedance equals 50 Ω. At the exact center of the patch, the

Even with a calculator, designers make mistakes. Here’s what a good calculator warns about: