Characterization of planar microstrip discontinuities

This paper proposes a solution to deal with the problem of the errors introduced by the presence of discontinuities in planar microstrip circuits in computing some physical quantities, like the distribution of the current, by the moment method. In this approach, we combine the Moment Method (MoM) with the method of generalized equivalent circuit (MCEG) for analyzing step discontinuities in microstrip circuits. The interest of the method is the translation of an electromagnetic problem to an electric one and the use of a few number of subdomain trial functions in the base of entire domain trial functions in the moment method, generally one or two functions by interface to correct the mistake of the results at the discontinuities of the structure. Furthermore, the obtained results are conformed to theory with respect to the boundary conditions and they are reasonably in good agreement with previously published data.