小型化超宽带H面脊喇叭端射天线

Miniaturized Ultra-wideband H-plane Ridged Horn Antenna with End-fire Radiation Pattern

超宽带天线技术是实现射频孔径综合的关键技术之一,适用于解决大型电子信息系统中采用多个天线带来的布局困难、互相干扰等问题。本文设计了一款具有端射特性的小型化超宽带H面脊喇叭天线。天线通过加载指数型脊结构,降低了矩形波导的截止频率,从而大幅展宽了天线工作带宽。同时,通过在喇叭口加载单曲面形介质透镜,改善了辐射口面上相位不均匀的问题,进而显著提高了天线的端射增益。该天线结构紧凑,其尺寸仅为0.57λ_(L)×0.45λ_(L)×0.11λ_(L),可覆盖0.8 GHz~18 GHz的超宽频带,且交叉极化优于30 dB。该天线剖面低、结构稳定、易于加工,可直接安装于金属结构上,易于与载体集成。通过与同类型端射天线相比可知,该天线在小型化和电性能两方面都具有优越性。

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 0.57λ_(L)×0.45λ_(L)×0.11λ_(L)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.