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When a network is matched to its external circuitry, the gain of the two port network is given by:

When a network is matched to its external circuitry, the gain of the two port network is given by: Correct Answer │S21│2

The gain of a two port network is given by the product of SS21 of the network and reflection co-efficient at the source end. But when the two port network is matched to the external circuitry, reflection coefficient becomes zero and gain reduces to │S21│2.

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