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Microstrip Patch Antenna Designer

Size a rectangular patch resonator from its frequency, laminate and substrate thickness.

GHz — the desired resonant frequency
εr of the substrate; FR-4 is about 4.4
dielectric height between patch and ground plane
applies to the substrate thickness only
Enter the frequency and laminate to size the patch.

Uses the transmission-line model for a rectangular TM₁₀ patch on a homogeneous substrate: width from the resonant half-wave condition, effective permittivity and fringing extension from the standard closed forms. The feed point is not calculated, and the length is the resonant dimension before any inset or notch is cut. Dielectric constant tolerance, copper thickness and the feed shift the real resonance by several percent, so prototype and measure before committing a board. Everything runs in your browser with no storage, uploads or network access.

Patch outline

Top view of the patch and the suggested ground plane, drawn to scale.