Experiment
1
Experiment
2
Experiment 3
Experiment
4
Experiment 3 : Voltage Standing Wave Ratio and Standing Wave
Result
1. Measurement of outgoing power, Pva.
Vva = mV, Pva = mW
2. Measurement of the reflected power, Pa with terminating
impedance connected.
Va = mV, Pa = mW
3. Measurement of reflected power Pvo with open line
Vvo = mV, Pvo = mW
4. Measurement of reflected power Pf with a strongly mismatched
line connected
Vvf = mV, Pvf = mW
Vf = mV, Pf = mW
5. Measurement of the reflected power Pan with a horn antenna
connected.
Van = mV, Pan = mW
Calculate the power ratios of every component of the reflected to outgoing power as a numeric value, Pa / Pva i.e. the
power reflection coefficient, ρ2 and the voltage reflection coefficient, ρ :
ρ a2 = ,
ρ a =
.
ρ o2 = , ρ o = .
ρ f2 = , ρ f = .
ρ an2 = , ρ an = .
Calculate the VSWR, s and the inverse standing wave ratio, m:
s a =
, m a =
.
s o = , m o = .
s f = , m f = .
s an =
, m an =
.
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m =1/s = (1-ρ) /(1+ρ)
ρ = Vr/Vv ρ = Pr/Pv Pr = [Pv (s-1) ²] / [(s+1) ²] = Pv. ρ² ρ =Pr / Pv ≤ 1
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