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Noise equivalent temperature of Wilkinson coupler having a gain of 1/2L is given as:

Noise equivalent temperature of Wilkinson coupler having a gain of 1/2L is given as: Correct Answer T (2L-1)

Noise equivalent temperature of the Wilkinson coupler is found using the relation T (1-G21)/G21. Substituting for G21 in the above expression, equivalent noise temperature is T (2L-1).

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A Wilkinson coupler designed can be operated at any frequency.
The plot of frequency v/s S11 parameter of a Wilkinson coupler has a dip at the frequency at which it is designed to operate.