Question

Which of the following is not true with respect to loop antennas?

(a) Horizontal polarization is assumed

(b) Resonance is achieved by a variable capacitor

(c) The horizontal antenna pattern is a figure of eight

(d) The currents are equal in amplitude and phase when the antenna is 90° with the transmitted signal

I got this question in an interview for internship.

The above asked question is from Point Source Radio Systems in section Terrestrial Radio Navigation System of Avionics

Answer 1

The correct option is (a) Horizontal polarization is assumed

For explanation I would say: The loop antenna is a rectangular loop of wire whose inductance is resonated by a variable capacitor. The signal is assumed to be vertically polarized and the horizontal antenna pattern is a figure of eight. When the loop is 90° with respect to the transmitted signal the currents induced are of same amplitude and phase.