Equivalent Circuit Extraction for Coaxial-to-Microstrip Transition Structure Using Response Surface Method

Coaxial-to-microstrip transition structure is a common discontinuity structure in the assembly processing of microwave electronic products. A simple and accurate equivalent circuit extraction method of coaxial-to-microstrip discontinuous structure is proposed in this paper. Response surface methodology (RSM) is applied to the extraction of the equivalent circuit of the coaxial-to-microstrip discontinuous structure for the first time. The equivalent circuit is obtained at a wide frequency band 5–40 GHz, and the explicit formulas of the model element for the equivalent circuit are given. The equivalent circuit can be embedded in the existing circuit analysis simulation software, which can greatly decrease the simulation time and have great potential for the real applications.