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VSWR Mismatch Errors
Both amplitude and phase errors are introduced when mismatched impedances are present at an electrical interface. The result is ripple across the frequency band (since the VSWR of each interface typically varies with frequency), as well as a portion of the incident power being reflected back to the source. Here is a well-done reflection coefficient video tutorial by SavvyPaper.
Here is a JavaScript calculator for VSWR / Return Loss / Reflection Coefficient / Mismatch Error / Improvement.
| Amplitude Error | Phase Error | ||
| εA = 20 * log (1 ± |ΓA * ΓB|) dB | εΦ = (180 / π) *| ΓA| * |ΓB| Note: This formula has also been seen written as εΦ= (180 / π) * sin-1 (| GA| * |GB|), See a derivation of this equation as provided by Haris Tabakovic | ||
| Resultant MIN and MAX Cascaded VSWR | |||
VSWRMIN = SA / SB
Example VSWRA = 2.5:1 --> SA = 2.5 | |||
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