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A frequency-reconfigurable wideband antenna with dual-notch response for cognitive radios (CRs) application is presented. By placing stub-loaded resonators beside the feed line, two notched bands are generated. The central frequency of one notched band can be controlled by loading varactors while the other notched band remains constant. The biasing circuits for the varactors consist of Bias T and...
The imaging systems require low aberration and large depth of focus (DOF) to get an acceptable sharpness of the image. The lens antenna consists of a dielectric lens and an antenna array on the focus plane of the lens which has a great effect on the imaging quality of the system. In this paper, an aspheric biconvex lens with an aperture diameter of 430 mm is designed in W-band which could obtain a...
A T-shaped stub-loaded ring-resonator (SLRR) slot etched on the ground plane or on the radiating patch has been designed and analyzed for antenna applications. Compared with the conventional ring slot, the two resonant frequencies of the proposed SLRR-slot can be lowered, and can also be tunable by varying the parameters of the four T-shaped stubs. To validate the design concept, a tri-band printed...
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