1.

Find the number of turns in the helical antenna with directivity 120 and Cλ=1 and pitch angle 6°.(a) 100(b) 50(c) 120(d) 12I have been asked this question in class test.This intriguing question comes from Frequency Independent Antenna in portion Frequency Independent Antenna of Antennas

Answer»

Right choice is (a) 100

The best explanation: DIRECTIVITY of helical ANTENNA D = 12CλnSλ

Pitch angle \(α=TAN^{-1}⁡\frac{S_λ}{C_λ}\)

⇨ Sλ=Cλ tan α=1*0.1=0.1

D = 12CλnSλ

120=12×1×n×0.1

n=100 turns


Discussion

No Comment Found

Related InterviewSolutions