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![]() "Cecil Moore" wrote in message et... ilam wrote: I am in a process of understanding the importance of S-Parameter at high frequencies, please answer my following questions: 1. Why Measuring a wave (voltage or current) is more easier than volage and current? ( Why measuring S-Parameter is more easier than other parameters?) The reflection coefficients are measurable physical entities and there is a well-defined procedure for measuring them. Virtual reflection coefficients, such as the ones used by hams, are not used with S-Parameters. That's an advantage. The voltages are normalized to the characteristic impedance of the transmission line and everything obeys the rules of the wave reflection model. There are certainly other methods of analysis, h-parameters, Z-parameters, etc. -- 73, Cecil http://www.w5dxp.com The problem with some of the other parameters is that short and open circuits are required to obtain the data. This can cause instability in active devices. Frank |
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