Transmission Lines

Transmission line calculators and formulas for characteristic impedance, reflection, and wave propagation on lines. Covers reflection coefficient, standing wave ratio, and line loss calculations.

6Formulas

All levels Difficulty

Updated Jul 2026

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Fundamental

Return Loss

RL = −20·log₁₀|Γ|

Fundamental

Phase Velocity

v_p = 1 / √(LC)

Fundamental

Propagation Constant

γ = √(Z·Y)

Fundamental

Standing Wave Ratio

SWR = (1 + |Γ|) / (1 − |Γ|)

Fundamental

Reflection Coefficient

Γ = (Z_L − Z₀) / (Z_L + Z₀)

Fundamental

Characteristic Impedance

Z₀ = √(L/C)