ANALYSIS OF TRANSMISSION-LINES OF FINITE THICKNESS ABOVE A PERIODICALLY PERFORATED GROUND PLANE AT OBLIQUE ORIENTATIONS

A general method is formulated for the analysis of signal lines of fin ite thickness in the presence of a periodically perforated ground plan e, Utilizing the dyadic Green's functions, a set of electric and magne tic field integral equations (EFIE, MFIE) is established, which are th en transformed into the spectral domain by the Fourier transform, Gale rkin's method is used to solve the combined integral equations. The B- spline functions are chosen as basis functions to achieve a higher ord er of convergence, The dispersive characteristics of the transmission lines are studied and the characteristic impedance of the signal lines are evaluated by both the voltage-current definition and the power-cu rrent definition, with good consistency, The effect of signal location s versus apertures in the ground plane is discussed, Finally, measurem ents are conducted, and the results agreed very well with the theory.