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In this paper we present the design of a Luneburg type of lens antenna, with a flat base, designed for wide angle scan. The antenna consists of a 11-layer lens, fed at its base by a 6×6 array of waveguides. The lens is broadband and has a very high aperture efficiency, only 1 dB below that of a reference aperture antenna with a uniform amplitude and phase. Its sidelobe level is good, only −21 dB at...
In this paper we present a flat lens based on a zoned two-layer design, which provides us the freedom to simultaneously control the magnitude and phase of the transmitted wave passing through the lens. A transmission line approach is used to analyze the reflection and transmission coefficients of the proposed two-layer slab, and a two-step method is introduced to determine the distribution of the...
In this paper, we will present some recent developments of flat-lens designs for microwave imaging applications at the EMC Laboratory of Perm State. We will also describe a procedure for systematically synthesizing artificial dielectrics, e.g., MTMs, for flat lens designs that can achieve a sub-wavelength focal plane behavior. The design has the advantages of being wideband and low-loss, and it is...
In this work we present a systematic approach for designing planar lenses using artificial dielectrics to realize the desired phase delays. The artificial dielectric is synthesized by using multilayer frequency selective surfaces (FSSs) with Jerusalem Cross (JC) elements, because they are found to be good candidates that provide stable response over a wide range of incident angles and for both polarizations.
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