Question

What is the use of loading coil?

(a) Correcting resonance to a desired frequency

(b) Increasing the antenna gain

(c) Sideband suppression

(d) Increasing the range of the antenna

I got this question by my college director while I was bunking the class.

I need to ask this question from Types of Antenna topic in chapter Antennas and Wave Propagation of Avionics

Answer 1

Right answer is (a) Correcting resonance to a desired frequency

To explain I would say: When a vertical antenna is made less than one-quarter wavelength, the practical effect is a decreased inductance. The antenna no longer resonates at the desired operating frequency, but at a higher frequency. To compensate for this, a series inductor, called a loading coil, is connected in series with the antenna coil. The loading coil brings the antenna back into resonance at the desired frequency.