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ELECTROMAGNETIC WAVE PROPAGATION ALONG A SINUSOIDALLY STRATIFIED DIELECTRIC SLAB,
POLYTECHNIC INST OF BROOKLYN N Y MICROWAVE RESEARCH INST
The guiding and scattering of electromagnetic waves in a periodically-stratified dielectric slab located in free space are investigated in detail. The problem is solved by representing the fields in both the air and the dieelectric regions in terms of modes with propagation normal to the slab. For a field polarized along the y direction, these modes are Bloch exponentials in the air region and Mathieu functions in the dielectric. The study reveals that a discrete spectrum of bound surface waves and leaky complex waves may be supported by such a configuration. When the thickness of the slab becomes infinitellely large, the configuration becomes a stratified dielectric halfspace which may support only a continuous but not discrete spectrum of waves. The effect of the interface and the Woods anomalies of the Rayleigh type are examined by expressing the interface discontinuity as an equivalent network for the propagating modes on both sides. For small modulation, simple analytical eexpressions are obtained and the network exhibits certain interesting properties.
AF19 628 4324