Discussion
How does a stacked patch widen the bandwidth?
Answer: C
Two resonators tuned slightly apart and coupled give a double humped response that is flatter and wider than either alone, exactly as in a two pole filter. The spacing and the coupling set how wide and how flat. Shielding, permittivity and absorption are not the mechanism, and absorbing reflected power would be a loss rather than a gain in bandwidth. Recognising the antenna as a resonant circuit lets the whole vocabulary of filter design be brought to bear on its bandwidth.
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