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Which of the following feed line uses the length of stub and L/W ratio to control the match?

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Which of the following feed line uses the length of stub and L/W ratio to control the match?

(a) Microstrip line feed

(b) Coaxial feed

(c) Aperture coupling

(d) Proximity Coupling

The question was posed to me at a job interview.

The question is from Feed Methods topic in chapter Slot & Microstrip Antenna of Antennas

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Best answer
Right answer is (d) Proximity Coupling

The best I can explain: 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. In Aperture coupling, ground plane separates the different substrates.

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