What is a rejector circuit? State its use. - Vidyadip

Question

What is a rejector circuit? State its use.

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Answer

A rejector circuit is a parallel LC resonant circuit used in communications and broadcasting as well as filter circuits to selectively reject a signal of a certain frequency.
The resonance curve of a parallel resonant circuit with a finite resistance of its inductor windings exhibits a sharp minimum at a certain frequency called the resonant frequency $f_r$. For an alternating signal of this frequency, the impedance of the circuit is maximum and the current is minimum. That is, the circuit has a selective property to reject a signal of frequency $f _{ r }$ while passing those of other frequencies.
Use : A rejector circuit is used at the output stage of a radiowave transmitter.

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