X波段宽带正交双线极化天线设计

Design of An X-Band Antenna with Broadband Orthogonally Dual-linear Polarization

为了满足某型电子系统特定的性能要求,本文研制了工作频率覆盖X波段全频段的正交双线极化喇叭天线。正交双线极化特性的实现主要是基于对称五端口分支形式的宽带正交模耦合器,喇叭天线的开口结构尺寸保证了覆盖空域的增益要求。在理论分析与仿真设计的基础上,加工了该天线工程样机并进行了实验验证。实测结果与仿真结果非常吻合,表明在所要求的工作频段内天线电压驻波比小于1.8,正交极化端口隔离度优于50 dB,并且具有优良的辐射特性。

In order to satisfy specially requirements of an electronic system, a broadband orthogonally dual-linear polarized horn antenna operating at X-band is developed. Implementation of the orthogonally dual-linear polarized property is mainly based on a broadband ortho-mode transducer （OMT） with symmetrical five-port junction. The aperture dimensions of the horn antenna could meet gain requirement for air space coverage. Based on theoretical analysis and software simulation, an engineering prototype is fabricated and verified by test. The measured results agree well with the simulated ones, which shows that within the required operating frequency band, VSWR of the designed antenna is less than 1.8, the orthogonal polarized port isolation is better than 50dB. In addition, the de- signed antenna demonstrates excellent radiation characteristics across the entire operating band.