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A STUDY OF FLUSH-MOUNTED AIRBORNE ANTENNAS FOR FERRET AND ECM APPLICATIONS
AERO GEO ASTRO CORP ALEXANDRIA VA
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Work was directed toward several basic problems associated with microwave radiation from apertures in proximity to finite conducting surfaces, with emphasis on techniques applicable to airborne antennas, particularly the use of open wave supporting structures. Results of a detailed investigation of effects of a low-susceptibility dielectric coating for parallel and perpendicular polarization indicated that low-angle signal enhancement for the two polarizations simultaneously could be obtained with the use of an artificially polarized dielectric layer. The effectiveness of two such media, a pin dielectric of very low density and a rodded dielectric, in achieving low-angle enhancement for both principal polarization is demonstrated. The problem of waves guided along a conducting channel loaded with a flush-mounted dielectric layer is treated theoretically using field equations of Helmholz form. Experimental results for vertically and horizontally excited waves are presented. Performance characteristics of a compact, broad-band, low silhouette radiator offering omnidirectional coverage in azimuth for both horizontal and vertical polarization, as well as a survey of materials for use in open wave-supporting media are summarized. Author
APPROVED FOR PUBLIC RELEASE