Numerical - Capture area of horn antenna for given 'f', 'λ' & gain

Q.  A rectangular horn antenna operating at 4GHz has the wavelength of 0.075m and gain of about 13dBi. What will be its required capture area?
- Published on 01 Oct 15

a. 0.0149 m2
b. 0.0475 m2
c. 0.5521 m2
d. 0.9732 m2

ANSWER: 0.0149 m2

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