For a simple load mismatch with a defined incident wave, accepted-power fraction is 1 minus the squared reflection coefficient magnitude. Mismatch loss is −10 log10 of that fraction.
How it works in practice
This calculation does not replace a full source-load mismatch analysis when both ends reflect. It also does not account for cable dissipation. State the assumptions and reference plane. Good matching reduces this loss, but other insertion losses may remain.
Example and interpretation
With a reflection magnitude of 0.2, accepted fraction is 0.96 and mismatch loss is approximately 0.177 dB.
Checks before use
- Identify the reflection coefficient
- Calculate accepted fraction
- Convert to dB
- Separate other losses
Important limit
Do not apply this single-load formula as a complete multi-reflection uncertainty model.
Related Centron RF product
SMA 2 W 6 GHz fixed attenuator. Use calculated levels to define a requirement, then compare it with the exact product’s current bandwidth, input power, impedance and available attenuation options. Calculations assume stated conditions and do not replace a component datasheet.
Further reading
Keysight: Fundamentals of RF and Microwave Power Measurements. This background reference explains general principles; the selected Centron RF model’s datasheet governs its own ratings.
Related guides
Educational guide. Numerical examples use the stated assumptions and are not test results for a supplied unit.