SURFACE-WAVE SCATTERING FROM A NOTCH IN A DIELECTRIC-COVERED GROUND PLANE - TE-MODE ANALYSIS

The problem of TE mode surface wave scattering from a rectangular notc h in a dielectric-covered ground plane is considered. A Fourier-transf orm technique is used to express the scattered field in the spectral d omain in terms of parallel-plate waveguide modes. The boundary conditi ons are enforced on the ground plane and the notch aperture to obtain simultaneous equations for the transmitted held inside the notch. The simultaneous equations are solved to obtain a solution in a fast conve rgent series, thus facilitating the numerical computation. The transmi ssion, reflection, and scattering coefficients are found to oscillate as the notch width increases especially when the notch depth is compar able to and larger than one wavelength. A limited number of computatio ns show that the reflected power loss is less than 2% when the notch w idth is less than one wavelength.