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What is the overall efficiency of a lossless antenna with reflection coefficient 0.15?

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What is the overall efficiency of a lossless antenna with reflection coefficient 0.15?

(a) 0.997

(b) 0.779

(c) 0.669

(d) 0.977
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The correct answer is (d) 0.977

Explanation: For a lossless antenna, the radiation efficiency ecd=1.

Overall efficiency of antenna is given by eo =ecd (1-(midgamma^2mid))=1×(1-(0.15^2))=0.977.
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