Browsing by Subject "Cylindrical antennas"

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    Radar cross-section study of cylindrical cavity-backed apertures with outer or inner material coating: the case of E-polarization
    (IEEE, 1993) Çolak, D.; Nosich, A. I.; Altintaş, A.
    A dual-series-based solution is obtained for the scattering of an E-polarized plane wave from a cavity-backed aperture which is formed by a slitted infinite circular cylinder coated with absorbing material. The material coating can be done on the inner or outer surface of the cylinder. For both cases, numerical results are presented for the radar cross section and comparisons are given for two different realistic absorbing materials. The radar cross-section results are also given for the aspect angle of the screen. Finally, the dependence of radar cross section on the thickness of the absorbing layer is presented. © 1993 IEEE
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    Smart radome improves reflector antenna directivity
    (IEEE, 1997) Altıntaş, Ayhan; Yurchenko, Viladimir; Nosich, A.
    A numerical optimization procedure is applied to two dimensional model of cylindrical reflector antenna arbitrarily located inside a circular cylindrical dielectric radome. If the radome thickness has been optimized, then varying the radome radius and the reflector position has a small effect on the directivity. However, the feed position should be corrected with respect to the free-space optimum after finding the best thickness. The optimization code is based on solving an integral equation by means of the regularization technique, guaranteeing a desired accuracy.