Question

The relation between the dipole lengths and the scaling factor τ in LPDA is given by _________

(a) \(\frac{L_N}{L_{N+1}} =τ\)

(b) \(\frac{L_N}{L_{N+1}} =\frac{1}{τ} \)

(c) \(\frac{L_N}{L_{N+2}} =τ\)

(d) \(\frac{L_{N+2}}{L_N} =τ\)

The question was posed to me during an online interview.

My enquiry is from Frequency Independent Antenna in section Frequency Independent Antenna of Antennas

Answer 1

Correct answer is (a) \(\frac{L_N}{L_{N+1}} =τ\)

The best explanation: The electrical properties of the log periodic antenna are repeated periodically in terms of logarithmic frequency. The relation between the antenna dipole adjacent lengths and the scaling factor is given as \(\frac{L_N}{L_{N+1}} =τ. \)