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Which of the following feeding has largest bandwidth?

(a) Microstrip line feed

(b) Coaxial feed

(c) Aperture coupling

(d) Proximity Coupling

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

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Correct answer is (d) Proximity Coupling

Explanation: Proximity coupling feed provides largest bandwidth. Microstrip line feed limits the bandwidth due to increase in substrate thickness. Coaxial feed has narrow bandwidth.

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