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What is the maximum directive gain of antenna with radiation efficiency 98% and maximum power gain 1?

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What is the maximum directive gain of antenna with radiation efficiency 98% and maximum power gain 1?

(a) 0.98

(b) 1.02

(c) 1.98

(d) 1

The question was asked in a job interview.

Asked question is from Directive Gain topic in section Antenna Parameters of Antennas

1 Answer

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Right answer is (b) 1.02

The explanation is: Gpmax=ηr Gdmax where ηr is radiation efficiency

Therefore Gdmax=1/0.98=1.02

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