Miniaturized Ultra-wideband H-plane Ridged Horn Antenna with End-fire Radiation Pattern
With the increasing demand for multi-function and multi-band operation,more antennas have been employed in dif-ferent electronic systems,which inevitably results in difficulties in antenna arrangement and severe interference.As a key technique of radio-frequency aperture integration,ultra-wideband(UWB)antennas provide an effective solution to this problem.A novel min-iaturized UWB H-plane ridged horn antenna with end-fire radiation property is proposed in this paper.In order to broaden the operat-ing bandwidth,an exponential ridge is employed and the cutting-off frequency of the rectangle waveguide is significantly reduced.By extending a hyperbola-shaped dielectric lens from the horn aperture,nearly uniform aperture phase distribution is achieved along the H-plane,which leads to a significant enhancement of the end-fire gain.This antenna has a compact form factor of only 0.57 λL×0.45 λL×0.11 λL and it maintains a wide operating bandwidth ranging from 0.8 GHz to 18 GHz.Moreover,the simulated cross polar-ization discrimination across the operating bandwidth is better than 30 dB.The antenna structure features a low profile,good stabili-ty,and easy fabrication,which can greatly facilitate its integration with metallic structures and missiles.Compared with other report-ed end-fire antennas,the proposed design shows remarkable superiority in terms of its electrical size and performance.
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