Discussion
Why is a patch antenna's measured pattern rippled at wide angles?
Answer: C
The direct radiation and the contribution diffracted from the board edge arrive with a path difference that varies with angle, so they alternately add and cancel and the pattern ripples, most noticeably towards the horizon and behind. A larger or absorber lined ground plane smooths it. Connector reflection, mode excitation and range length can all degrade a measurement but produce different signatures. Recognising a ripple as an interference effect points straight at a second path.
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