Question

When a dipole with a parasitic reflector is used as a feed system, the distance between them is _____

(a) 0.125λ

(b) 0.4λ

(c) 1λ

(d) 0.625λ

I had been asked this question by my college director while I was bunking the class.

My query is from Feeding Systems topic in section Reflector Antenna of Antennas

Answer 1

The correct option is (a) 0.125λ

Easy explanation: In a parabolic reflector antenna, a dipole along a parasitic reflector serves well as a feed radiator. The distance between parasitic reflector and the dipole is 0.125λ. The distance between dipole to dipole is approximately 0.4λ.