Question

Which among the following is not a reason for the use of antenna coupler?

(a) To make the antenna look resistive

(b) To provide the output amplifier with correct load impedance

(c) To discriminate against harmonics

(d) To prevent re-radiation of the local oscillator

I got this question in quiz.

I want to ask this question from Practical Aspects of Sampling in chapter Multiplexing & Sampling of Bandpass Signal of Analog Communications

Answer 1

The correct choice is (d) To prevent re-radiation of the local oscillator

Explanation: Antenna coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them. Antenna coupler is never used to prevent re-radiation of the local oscillator.