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Wideband performance has been obtained from a microstrip patch antenna by using parasitic patches coupled along the nonradiating edges. The concept of the coupled microstrip line model is extended for the theoretical interpretation of the input impedance of a two-patch gap coupled along the nonradiating edges. It is concluded that the theory presented here(More)
A technique for developing a new type of feed horn with the same radiation characteristics as a metallic corrugated horn is presented. This horn antenna with low back and sidelobe levels can be used as a substitute for a metallic corrugated horn with added advantages of high gain, low cross polarization, low cost, and light weight. The convenience of the(More)
The design and development of a feed-horn antenna with flow sidelobe and low cross-polarization levels are reported. The E-walls of this antenna are fabricated with low-loss dielectric substrate, periodically loaded with thin conducting strips. The antenna simulates the radiation characteristics of metallic corrugated horns. This can be an ideal substitute(More)
The authors present the results of the numerical solution to the problem of periodic metallic strips on a dielectric sheet above the ground plane. The present method is an extension of J. H. Richmond's (IEEE Trans. Antennas Propagat., vol.AP-28, p.883-7, 1980) approach. Calculation results agree well with experimental results. The low backscattered surface(More)
A method to lower the resonant frequency of a rectangular microstrip antenna, without degrading the radiation characteristics is proposed. The overall reduction in the area of the new antenna is more than 60% of a standard rectangular patch antenna operating at the same frequency. This antenna may find applications in large phased arrays where the size is a(More)
A theoretical analysis of the radiation pattern of dielectric image guide leaky-wave antennas is presented. Metallic perturbations in the antenna structure are considered as radiators of electromagnetic waves, and the array theory is applied to compute the radiation patterns by introducing the width of the perturbation element as a new parameter. The(More)
A method for RCS (radar-cross-section) reduction of metallic cylinders using periodic strip grating techniques is presented. The RCS of a cylinder with a periodic strip-loaded dielectric surface (SLDS) is determined experimentally and is compared with a reference target having the same dimensions. A typical reduction of 30-40 dB is obtained. It is concluded(More)
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