Question

Which of the following statements is false?

(a) Log periodic antenna is a broadband antenna

(b) The active region doesn’t change with the change in frequency in Log Periodic antenna

(c) The geometry structure of the dipole changes proportional to the wavelength in LPDA

(d) Impedance is function of logarithmic of frequency

This question was posed to me in a job interview.

Question is from Frequency Independent Antenna topic in section Frequency Independent Antenna of Antennas

Answer 1

Correct option is (b) The active region doesn’t change with the change in frequency in Log Periodic antenna

To explain: In Log period antenna, the active region changes with the change in frequency. There are three regions of operation in the LPDA.Impedance is function of logarithmic of frequency in LP so it is called log periodic antenna.