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Which of the following is the disadvantage of the coaxial feeding?(a) Fabrication is very difficult(b) Low spurious radiation(c) Narrow Bandwidth(d) No generation of higher order modesI got this question during an internship interview.My doubt stems from Feed Methods in portion Slot & Microstrip Antenna of Antennas

Answer»

Correct option is (c) Narrow Bandwidth

The best EXPLANATION: In coaxial feed, inner conductor is attached to PATCH and outer conductor to ground plane. Coaxial feeding fabrication is simple and has LOW SPURIOUS radiation which is its advantage. Due to asymmetries, higher modes are GENERATED and produces cross polarization radiation.



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