1.

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 signalI 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»

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.


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