This paper presentsa a method of analysis of distributed slot discontinuity in a microstrip line ground plane based on transverse resonance technique. The scattering characteristics of symmetrical and nonsymmetrical slot resonators of a complex shape have been calculated by Galerkin’s procedure and taking into account the harmonics of current density in the microstrip line and waveguide modes in the slot aperture. As a computational example the analysis of a finite cell periodic structure on the basis of P- and O-shaped slot resonators in the ground plane of a microstrip line are presented. The effectiveness and accuracy of the proposed algorithm has been verified by the comparison with measurements conducted on experimental prototypes.
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