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Find the half-power beamwidth (HPBW) and first-null beamwidth (FNBW), in radians, for the following normalized radiation...

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Find the half-power beamwidth (HPBW) and first-null beamwidth (FNBW), in radians, for the following normalized radiation...

Find the half-power beamwidth (HPBW) and first-null beamwidth (FNBW), in radians, for the following normalized radiation intensity U(?)=cos(4?) where (0? ? ? ?/2, 0??? 2?). HPBW= _____ radians and FNBW= _____ radians

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