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A rectangular horn antenna has an aperture area of 3λ × 2λ. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is:

A rectangular horn antenna has an aperture area of 3λ × 2λ. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is: Correct Answer 17.1 dB

Given the aperture dimensions of an antenna, the directivity that can be achieved is ap4π A/λ2, where A is the aperture area and λ is the operating wavelength, ap is the aperture efficiency. Substituting the given values in the above equation, the directivity achieved is 17.1 dB.

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Statements : Some taxis have horns. Some taxis have lights.

Conclusions :
I. Every taxi has either horn or light.
II. Some taxis have neither light nor horn.
III. Some taxis have horns as well as lights.
IV. No taxi has horn as well as light.