If maximum and minimum voltages on a transmission line are 4 V and 2 V respectively, VSWR is

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  2. 2
  3. 1
  4. 8

Answer (Detailed Solution Below)

Option 2 : 2
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Detailed Solution

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Concept:

  • Voltage Standing Wave Ratio (VSWR) defines mismatch on the line.
  • It is also the measure of the deviation of impedances or current or voltages from their central values.
  •  \(VSWR=\frac{V_{max}}{V_{min}}\) -----(1)
  • The value of VSWR varies from 1 to ∞.                  
  •  (1 ≤ VSWR < )

Calculation:

Given:

Vmax = 4

Vmin = 2

From equation (1):

\(VSWR=\frac{4}{2}\)

VSWR = 2

Important Points

Γ  is the amplitude ratio of reflected voltage to the forward voltage.

It also indicates a mismatch between the expected impedance and the actual impedance at that point.

\(Γ=\frac{Z_L-Z_0}{Z_L+Z_0}\)

Where,

ZL = Load Resistance

Z0 = Characteristic Impedance

The value of Γ varies between 0 and 1

0 ≤ Γ ≤ 1

Γ = 1 when there is complete reflection.

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