Radiation from Dielectric Loaded Waveguide Fed Aperture Antennas.
Technical rept. May 68-Jul 69,
NEW MEXICO UNIV ALBUQUERQUE OFFICE OF RESEARCH SERVICES
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Theoretical and experimental studies of the radiation pattern and input admittance of dielectric loaded waveguide fed aperture antennas are presented. The model consists of a waveguide fed, dielectric loaded aperture whose outer surface is flush with an infinite, perfectly conducting ground plane. The aperture and ground plane are covered by a dielectric layer. The window and the covering layer may be inhomogeneous in the direction of propagation. The analysis makes use of a mode-matching process that permits the effects of higher order modes to be taken into account in the dielectric loaded aperture section and in the covering layer. The window and layer are represented by an arbitrary number of inhomogeneous, lossy, dielectric slabs, each with slightly different permittivities. Collaction point-matching techniques are used to match boundary conditions at each interface within the dielectric loaded aperture section and two-dimensional Fourier transforms are used to match boundary conditions at each interface in the covering layer. Matrix techniques are used to handle an arbitrary number of layers in either region. A large number of experimental measurements of input admittance and far-field radiation pattern measurements are presented for three different aperture configurations, with and without a covering dielectric layer. A computer program is described that can handle the computations. The program is written in FORTRAN IV for a Control Data Corporation 6600 machine. Computed values of input admittance and far-field radiation patterns are presented. Author
- Electrical and Electronic Equipment
- Radiofrequency Wave Propagation