An antenna with a circular aperture has a circular beam with a beamwidth of 3° at 20 GHz.
(a) What is the antenna directivity in dB?
(b) If the antenna area is doubled, what will be the new directivity and new beamwidth?
(c) If the aperture is kept the same as in (a), but the frequency is doubled to 40 GHz, what will the directivity and beamwidth become then?
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