Md. Wu et al., FULL-WAVE CHARACTERIZATION OF THE MODE CONVERSION IN A COPLANAR WAVE-GUIDE RIGHT-ANGLED BEND, IEEE transactions on microwave theory and techniques, 43(11), 1995, pp. 2532-2538
A full-wave algorithm is proposed to analyze thoroughly a 90 degrees b
end of coplanar waveguide (CPW). Based on the mixed potential integral
equation (MPIE) formulation, the equivalent magnetic current distribu
tion on the apertures is solved by the moment method using overlapping
rooftop basis functions and the Galerkin weighting procedure, The mat
rix pencil approach is then utilized to do the de-embedding procedure
and extract both the coplanar and slotline modes scattering off the as
ymmetric discontinuity. Experiments are performed to measure the scatt
ering parameters and the results verify the accuracy of the present al
gorithm. The full 4x4 scattering matrix between these two modes is pre
sented and from which, the occurrence of the mode conversion is invest
igated, The mode conversion is noticed to become almost complete at ce
rtain frequencies, which may be useful in the design of CPW to coupled
slotline transition.