Discussion
How is the resonant frequency of a circular patch set?
Answer: D
The resonance follows from the radius through the zeros of the Bessel function derivative, scaled by the wavelength in the substrate, with a small edge extension for fringing. Thickness affects bandwidth and the extension slightly, and feed position sets the impedance rather than the frequency. The parallel with the rectangular patch is close: one dimension and one material property set the frequency, and the feed position then selects the impedance along the standing wave.
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