
200 Microwave Engineering
Γ and T are required, the angles made by the phasor oz and o′z with the real
axis can be measured and the respective values can be evaluated.
6.6.4 Voltage Standing Wave Ratio
In view of Equation 6.11, VSWR (
ρ
) is related to r (
ρ
= r for R > R
0
) or 1/r
(
ρ
= 1/r for R < R
0
). Thus, the Smith chart can be used to evaluate voltage (or
current) standing wave ratios. The VSWR may have an integer or non-integer
real value. To nd its value, with p = 0, q = 0 point as the centre and p = k (k
corresponds to r) as the radius draw a circle on the Smith chart. The cross-
ing of this circle on one side of the real axis will corr ...