Radio Amateur Quiz Canadian License

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Question A-007-008-006

How can the approximate beamwidth of a beam antenna be determined?

Correct Answer

Note the two points where the signal strength is down 3 dB from the maximum signal point and compute the angular difference

Explanation

The half-power beamwidth (HPBW) of an antenna is the angular separation between the two points on the main radiation lobe where the radiated power density is one-half (-3 dB) of its maximum value.

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