Transactions of Nanjing University of Aeronautics & Astronautics
A Directional DifferentialFed UWB Antenna with Stable Radiation Pattern
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Abstract:
A directional ultrawideband (UWB) antenna with improved radiation patterns is presented. The proposed sheme comprises a differentialfed microstrip antenna and a rectangular cavity. The hexagonshaped slot and four trianglecut corners on the ground plane of the planar antenna are used to improve the impedance matching within the UWB frequency range. A rectangular cavity is used as the reflector for the planar microstrip antenna, so as to achieve directed radiation. The measured results indicate that the designed antenna exhibits a stable broadside directional radiation patterns within the entire operating frequency band. Furthermore, thanks to the differentially driven technique, the crosspolarization is greatly decreased and the polariz ation purity is maintained in a high level.
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