Discussion
What is a planar inverted F antenna?
Answer: A
Shorting one edge places a voltage null there, so the structure resonates as a quarter wave rather than a half wave and is about half the size of an equivalent patch. The shorting pin or wall and the feed pin close together give the F shaped side view that names it. It became the standard internal handset antenna for exactly this size reason. Halving a resonator by exploiting a symmetry plane is a technique that recurs throughout antenna design.
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