双频段双极化共孔径阵列馈源反射面天线设计

摘要

A novel dual-band dual-polarized shared-aperture array-fed offset parabolic cylindrical reflec-tor antenna operating at Ku and Ka bands is presented.In the dual-band dual-polarized shared-aperture array, the radiating element at Ka band is the longitudinal slot in the broad face of rectangular waveguide which is in the lower layer of the shared-aperture array,the radiating element at the dual-polarized Ku-band is rectangu-lar microstrip patch antenna which is in the top layer of the shared-aperture array.The design and measure-ment results of this shared-aperture array are presented.The semi-physical simulation is also completed on the FEKO software platform.The simulation results indicate that the azimuth plane scanning capacity at the dual-polarized Ku-band is better than ±17°and the sidelobe level is better than -30 dB in two main planes, as well as the azimuth plane scanning capacity at Ka-band is better than ±10°and the sidelobe level is better than - 30 dB in two main planes.The beam width and the beam pointing in two main planes are matched completely.%介绍了一种新型Ku／Ka双频段双极化共孔径阵列馈源偏馈抛物柱反射面天线的设计。在双频段双极化共孔径阵列馈源设计中，Ka 波段采用裂缝波导阵，并且位于共孔径馈源阵列的下层，双极化 Ku波段采用微带贴片天线、位于共孔径阵列馈源的上层。文中给出了该双频段双极化共孔径阵列馈源的设计及测试结果，并将该测试结果代入偏馈抛物柱反射面天线中在 FEKO 软件平台上进行了半实物仿真，仿真结果表明，该双频段双极化共孔径阵列馈源偏馈抛物柱反射天线实现了如下设计目标：Ku 波段双极化水平面扫描范围为±17°，两个主面副瓣电平优于－30 dB，Ka 波段水平面扫描范围为±10°，两个主面的副瓣电平优于－30 dB，双频段双极化两个主面的波瓣宽度和波束指向完全匹配。