microwave software®
Utilities+® User Manual
RF/Microwave Design Utility Programs
MISMATCH ERROR LIMITS
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Mismatch Error Limits This program calculates the +/-(dB) uncertainty in the power transfer between a source and load given the reflection coeffi- cient magnitude of each. Enter S,L Ref. [<Enter>=Quit] ? _ |
Given that the reflection coefficient of a source and a load are >0, or that, alternately, the VSWR is >1, (which is always the case in the real world), there will be an uncertainty in the power transfer between the two due to relection.
This program lets you quantify that error. If you don't know the reflection coefficients, but you do have the VSWR, use the Utilities+ Ref/MM/VSWR program first to convert VSWR to reflection coefficient magnitude. Press BACK on your browser to return to this page.
Assume that we have a VSWR = 1.35 source driving a VSWR = 1.5 load. The reflection coefficients of the source and load are, respectively, 0.15 and 0.2. What is the mismatch uncertainty?
To find the uncertainty, enter the "S,L Ref." reflection data as ".15,.2" at the prompt up above, and then press <Enter>.
Here is the output calculation:
+ Error = 0.257 dB
- Error = -0.265 dB
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