Publication

Abstract : This paper presents an effective technique to develop the macromodel of a coaxial-to-microstrip transition (CMT) for X-band applications. CMTs generally manifest as discontinuous structures in the assembly and processing phases of RF and microwave circuit design, especially in systems that employ printed circuit boards. Macro models are necessary to address the parasitic coupling effects in CMT that occur at high frequencies. The proposed approach employs fast relaxed vector fitting (FRVF) to model the CMT as a stable state-space model. The developed model effectively simplifies the simulation process of systems that incorporate CMT which enables a reduction in computational complexity while maintaining system accuracy and stability. The developed macromodel using the proposed approach was found to be stable and causal with an RMSE fitting error of ≈ 10−4 for an order of approximation of 18.