A fixture de-embedding method for material S-parameters measurement

The material S-parameter is one of the important parameters, for that it characterizes material electromagnetic properties like μ and ε. The fixture is usually used for the S-parameter measurement, but the fixture will cause the embedding error during the process of measurement. Thus, it is important that the embedding error should be eliminated for improving the S-parameter accuracy as more as possible. The measurement system is mapped into the cascade model of port network, and five states of cascade network are designed. Then, state equations can be built to solve fixture S-parameters problem. The result is proved that the proposed method of S-parameter de-embedding is feasible. And the simulation result shows that the maximum deviation between the calculated value and the physical simulated value is less than 2dB from 0.1 to 1.5 GHz.