Discussion
Why does the input resistance of a patch fall towards its centre?
Answer: D
The half wave standing wave puts a voltage maximum and current null at each open end and the reverse at the centre, so the ratio of voltage to current, which is the resistance, falls from hundreds of ohms to zero. Feeding anywhere between selects an intermediate value. Substrate thickness and ground plane spacing are uniform, and the centre does not radiate much because the fields there do not fringe. Locating the voltage and current maxima explains the impedance behaviour of every resonant structure.
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