Unified Equivalent Circuit Model of Finite-Ground Microstrip Line Open-End Discontinuities Using MoM-SOC Technique

Sheng SUN  Lei ZHU  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.5   pp.828-831
Publication Date: 2004/05/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Microwaves, Millimeter-Waves
finite-ground microstrip line,  open-end discontinuity,  equivalent circuit model,  short-open calibration procedure,  method of moments,  

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Finite-ground microstrip line (FGMSL) open-end discontinuities are characterized via a self-calibrated method of moments (MoM) as a unified circuit model with a fringing capacitance and radiation conductance. By integrating the short-open calibration (SOC) procedure into a determinant MoM, the model parameters are extracted without needing the alternative port impedance. Regardless of non-ideal voltage sources, extracted parameters are observed to achieve a stable convergence as the feeding line is sufficiently extended. After extracted capacitance of a FGMSL open-end with equal strip and finite-ground widths are validated against its traditional MSL counterpart with infinite ground, extensive results are given to originally demonstrate that the capacitance increases as a decelerated function of the finite-ground width and length while the conductance is negligibly small as compared with its imaginary part.