Discussion
What is the usual resonant length of a rectangular patch?
Answer: B
The patch behaves as a half wavelength resonator in the dielectric, with the two ends acting as open circuits and the fringing fields there doing the radiating. Because the wavelength in the substrate is shorter than in free space, the patch is smaller than a half wavelength in air. A quarter wave version exists if one edge is shorted, which is the basis of the planar inverted F antenna. The half wavelength resonance is the starting point for every patch calculation.
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