一种K频段宽带双极化滤波喇叭天线设计

文中设计了一种K频段宽带双极化滤波喇叭天线，该天线采用阶梯型喇叭代替传统喇叭提升了天线效率，并通过在馈电波导冗余空间中引入一种T/Π型滤波结构，提升了天线带外的抗干扰能力. 仿真和实验结果表明，该双极化天线的?10 dB阻抗带宽超过5 GHz，覆盖了K/Ka频段卫星的下行频段，天线效率超过58%，并在其上行频段实现了超过33.1 dB的带外抑制，该天线可作为单元用于K/Ka频段卫星下行频段的大型阵列天线设计.

Design of a K-band broadband dual-polarized filtering horn antenna

This paper introduces a broadband dual-polarized filtering horn antenna operating in K-band. By using a stepped horn instead of the traditional horn and introducing the filtering structure of T/Π-type units into the redundant space of the waveguide feeder, the antenna obtains a high efficiency and an out-of-band anti-interference ability. Simulated and measured results show that the ?10 dB impedance bandwidth of the dual-polarized antenna is more than 5 GHz, covering the downlink frequency band of the K/Ka satellite. The antenna efficiency is higher than 58%, and it also achieves the uplink frequency band suppression of more than 33.1 dB. The antenna can be used as an element for the design of K/Ka satellite downlink large array antenna.