Antenna Calculator — Inset Fed Microstrip Patch

She already had the patch dimensions: length ( L ), width ( W ), on a humble FR4 substrate. But theory gave her a 200-ohm input impedance at the patch’s radiating edge — useless for her 50-ohm system. She needed to move the feed point inward along the width, where impedance drops to 50 ohms.

Most online calculators just solve this iteratively — and that’s the “good story” of how a simple trigonometric insight saves your antenna from becoming a dummy load. inset fed microstrip patch antenna calculator

Priya knew the formula by heart, but manual errors had already melted two prototypes. The first: return loss of -4 dB (basically a heater). The second: resonant at 2.7 GHz (hello, satellite interference). She already had the patch dimensions: length (