Question

If there are no any reflections, then the value of the SWR will be ________________

(a) 1

(b) 0

(c) ∞

(d) 2

I got this question in an online interview.

I want to ask this question from Standing Wave Ratio Method topic in chapter Modern Antennas & Antenna Measurements of Antennas

Answer 1

Right choice is (a) 1

Easiest explanation: The standing wave ratio is defined as the maximum voltage to minimum voltage.

\(S=\frac{V_{max}}{V_{min}} =\frac{1+ρ}{1-ρ}\)

And reflection coefficient is \(ρ=\frac{P_{ref}}{P_{inc}} =0 \) (Since there are no reflections).

\(S=\frac{1+ρ}{1-ρ}=1\)