Question

What is the length of the shortest element in the yagi antenna?

(a) One quarter the wavelength of the highest frequency

(b) One quarter the wavelength of the lowest frequency

(c) One half the wavelength of the highest frequency

(d) One half the wavelength of the lowest frequency

The question was posed to me during an interview.

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

Answer 1

Right option is (c) One half the wavelength of the highest frequency

To explain: The lengths of the driven elements vary from long to short and are related logarithmically. The longest element has a length of one-half wavelength at the lowest frequency to be covered, and the shortest element is one-half wavelength at the higher frequency. The spacing is also variable.