This calculator determines the Voltage Standing Wave Ratio (VSWR) from the forward and reflected power of an RF signal. It helps evaluate how efficiently power is transmitted without reflection in a transmission line or antenna system.
Formula
VSWR = (1 + √(Pr / Pf)) / (1 – √(Pr / Pf))
Formula Explanation
- Pf is the forward power transmitted toward the load (in watts).
- Pr is the reflected power returning from the load (in watts).
- The ratio of Pr to Pf indicates mismatch losses and reflection levels.
Example
Input: Pf = 100 W, Pr = 11.1 W
Result: VSWR ≈ 1.67
Who uses it
Useful for RF engineers and technicians to assess transmission efficiency and detect mismatches in antenna systems.