GREENS IMPEDANCE FUNCTION-APPROACH FOR PROPAGATION CHARACTERISTICS OFGENERALIZED STRIPLINES AND SLOTLINES ON NONLAYERED SUBSTRATES

A newly proposed generalized full-wave space-domain integral equation technique incorporating dyadic Green's impedance function and a new se t of basis functions are presented for the analysis of striplines and slotlines arbitrarily integrated on multiple nonlayered sustrates. The generalized full-wave integral equation technique is validated by con ducting convergence study and several case studies. The theoretical di spersion characteristic of the transmission lines obtained here are in very good agreement with the published and measured data for the modi fied Microslab and the microstrip proximity effect near substrate edge . For the slotline type problem, where a new set of current basis func tion must be derived to be incorperated into Green's impendance functi on approach, the new approach presented here shows that the correspond ing propagation characteristics thus obtained are also in excellent ag reement with those reported in the available literature, which normall y used the slot electric fields as the unknowns. To explain bow genera l the present formulation is, it can be reduced to the well-known spec tral domain formulation for any guided-wave structure containing only layered substrates.