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Which of the following is true regarding the coaxial coupling feed in Microstrip antenna?

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Which of the following is true regarding the coaxial coupling feed in Microstrip antenna?

(a) Inner conductor is connected to patch and outer conductor to ground plane

(b) Outer conductor is connected to patch and inner conductor to ground plane

(c) It is connected to patch just like a conducting strip

(d) It contains two different substrates separated by a ground plane

I had been asked this question during a job interview.

My question is taken from Feed Methods topic in section Slot & Microstrip Antenna of Antennas

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The correct answer is (a) Inner conductor is connected to patch and outer conductor to ground plane

The explanation: A coaxial feed consists of inner and outer conductors to which the patch and ground planes are attached respectively. In a Microstrip feed line the patch is attached to the feed like a conducting strip. Different substrates are used in aperture coupling.

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