1.

The minimum height of antenna required for transmission in terms of ʎ is ________(a) ^3ʎ⁄2(b) ^ʎ⁄4(c) 2ʎ(d) ʎThis question was addressed to me in an interview for internship.I need to ask this question from Source of Information in chapter Elements of Communication System of Analog Communications

Answer»

Correct choice is (b) ^ʎ⁄4

The BEST explanation: For effective transmission, HEIGHT of antenna should be one-forth of ʎ.

(H = ^ʎ⁄4 where ʎ = ^c⁄f). The reason for maintaining antenna height to ʎ/4 is for matching IMPEDANCE. It means that the antenna is atleast 1/4^th above ground LEVEL.



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