ट्रांसमिशन लाइन प्रतिबाधा कैलकुलेटर — सूत्र

What is VSWR?

VSWR (Voltage Standing Wave Ratio) measures impedance mismatch between a transmission line and its load. A perfect match is 1:1.

Formulas

Gamma = Z_load - Z_0/Z_load + Z_0

VSWR = (1 + Gamma) / (1 - Gamma)

Return Loss = -20 x log10(Gamma) dB

Interpretation

  • VSWR 1.0: Perfect match (0% reflected)
  • VSWR 1.5: Good match (4% reflected)
  • VSWR 2.0: Acceptable (11% reflected)
  • VSWR 3.0+: Poor match (25%+ reflected)

    • हल किया गया उदाहरण

    75 ohm load on a 50 ohm transmission line.

    1. Gamma = |75 - 50| / |75 + 50| = 25 / 125 = 0.2000
    2. VSWR = (1 + 0.2) / (1 - 0.2) = 1.2 / 0.8 = 1.50
    3. Return loss: -20 x log10(0.2) = 13.98 dB
    4. Power reflected: 0.04 = 4.0%