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Which of the following allows independent optimization of feed mechanism?

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Which of the following allows independent optimization of feed mechanism?

(a) Microstrip line feed

(b) Coaxial feed

(c) Aperture coupling

(d) Proximity Coupling

I have been asked this question during an internship interview.

This intriguing question originated from Feed Methods topic in portion Slot & Microstrip Antenna of Antennas

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Right option is (c) Aperture coupling

Explanation: In Aperture coupling, two different substrates are separated by ground plane.  This type of arrangement optimizes feed mechanism and radiating element.In Proximity coupling, the length of stub and length to width ratio of patch controls the match. Microstrip line feed acts as an extent to patch and is connected to patch just like a conducting strip. In coaxial feed, inner conductor is attached to patch and outer conductor to ground plane.

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