Inset Feed Calculator [upd]: Patch Antenna

This entire article assumes a patch. For a circular patch, the inset feed is replaced by an offset feed along the radius. The math uses Bessel functions. A standard rectangular calculator will give you garbage results.

An inset feed is coplanar . A proximity-coupled feed (feed line under the patch) offers wider bandwidth but is harder to manufacture. Inset feed calculators do apply to proximity coupling. patch antenna inset feed calculator