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Reciprocity applies to which of the following devices?

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Reciprocity applies to which of the following devices?

(a) Isolator

(b) Circulator

(c) Balun

(d) RF amplifiers

The question was posed to me in unit test.

This is a very interesting question from Types of Baluns in chapter Radiation, Baluns & Polarization of Antennas

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Correct answer is (c) Balun

The best explanation: In a Balun, a 3 port network, contains one matched input and two differential outputs. It is used to convert the unbalanced signal to balanced and vice-versa. So it is reciprocal. Isolator, Circulator, RF amplifiers are Non reciprocal devices.

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