# Electronics and Communication Engineering - Microwave Communication - Discussion

Discussion Forum : Microwave Communication - Section 1 (Q.No. 2)
2.
A loss less line of characteristic impedance Z0 is terminated in pure reactance of -jZ0 value. VSWR is
10
2
1
infinity
Explanation:

A pure reactance does not absorb any power.

Therefore VSWR is infinite because |rv| = 1.

Discussion:
9 comments Page 1 of 1.

Beulah Durairaj said:   2 years ago
VSWR = 1 + |ρ| / 1 - |ρ|.

Given: Zo, reactance value = -jZo..
That is ZL = 0 + (-jZo) = -jZo..
ρ= ( ZL - Zo) / ( ZL + Zo)
ρ = -jZo - Zo / -jZo + Zo.

Then take magnitude for ρ.

| ρ | = √ {(-jZo)2 + ( -Zo)2 }/(-jZo)2 + (Zo)2 }
| ρ | = √ { ( Zo)2 + (Zo)2 }/{ (Zo)2 + ( Zo)2 }
| ρ | = √(2 Zo)2/( 2Zo)2
| ρ | = √1 = 1.

VSWR = 1 + | ρ | / 1 - | ρ|
VSWR = ( 1 + 1) / (1 - 1)
VSWR = 2 / 0 = INFINITY.

Vineet said:   6 years ago
In that expression of VSWR, it is the magnitude of reflection coefficient |ρ|.

Roli said:   7 years ago
Reflection coefficient is ρ.

Guru said:   7 years ago
What's that RHO?

Vinay said:   7 years ago
How? Explain it in clear.

SWETHA said:   7 years ago
VSWR = (1 + rho)/(1 - rho),
rho = (ZL - Z0)/(ZL + Z0).

SWETHA said:   7 years ago
VSWR = (1 + rho)/(1 - rho),
rho = (ZL - Z0)/(ZL + Z0).

Gurpreet kaur said:   8 years ago
@Faizz.

VSWR means Voltage Standing Wave Ratio = (1 + |rho v|) / (1 - |rho v|).

Here (rho v) is (reflected power)/(incident power).

Faizz said:   8 years ago
Can I get some information about VSWR?