Discussion
The property of Faraday rotation in the ferrite material is used by which of the following ?
(1) Circulators
(2) Isolators
(3) Directional coupler
(4) Magic Tee
Codes :
Answer: D
Faraday rotation is used in (1) and (2), circulators and isolators.
In a magnetised ferrite the plane of polarisation of a wave rotates by an amount that does not depend on the direction of travel, so the effect is non-reciprocal. A Faraday rotation isolator uses this to pass a wave in one direction and absorb it in the other, and a Faraday rotation circulator routes power from each port to the next in one rotational direction only.
The directional coupler and the magic tee are reciprocal passive junctions made of ordinary waveguide. They need no ferrite and do not use Faraday rotation, so any option including (3) or (4) is wrong.
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