A Simple Approach to Analyze Asymmetrical Gaps of Various Configurations in Microstrip Line

To predict transverse distribution of surface currents density on strips of asymmetrical series gap in microstrip line particularly near to discontinuity, a rather simple two- dimensional and quasi-TEM approach in which a strip is transformed into multi-conductor transmission lines (MTL), is developed. Moreover a general equivalent circuit consisting of two asymmetrical steps plus a symmetrical series gap of great use in either symmetrically or asymmetrically placed gaps of unequal widths in microstrip line, is proposed and its corresponding scattering parameters are brought into comparison with a couple of rigorous fullwave analyses such as finite element method and method of moment as well as with an equivalent circuit reported earlier in literature. Those are in good agreement in a wide range of frequency.