一种X/Ka双频共用同轴馈源设计

Design of X/Ka Dual Band Coaxial Feed

针对深空探测通信的需求,提出了一种X/Ka双频共用同轴馈源设计。馈源由X频段圆极化器、X频段十字波导结、Ka频段圆极化喇叭等部件组成。馈源在X频段以同轴波导形式工作,在Ka频段以圆波导形式工作。从X频段波导端口馈入TE10模激励时,在空间形成左旋圆极化波束,从Ka频段波导端口馈入TE10模激励时,在空间形成右旋圆极化波束,从而实现双频双圆极化工作模式。对实际设计的馈源进行了仿真分析,结果表明:该馈源具有较好的阻抗特性和方向图特性,能够满足新一代深空探测双频通信的需求。

Considering the requirement of deep space exploration communication,this paper proposes a design of X/Ka dual band coaxial feed.This feed consists of X band polarizer,X band cruciform waveguide junction and Ka band circular polarized horn.The feed is a coaxial waveguide in X band and a circular waveguide in Ka band.When driven in the X band waveguide port in TE10 mode,the LHCP（left hand circular polarization）beam can be achieved,and when driven in the Ka band waveguide port in TE10 mode,the RHCP（right hand circular polarization）beam can be achieved,thus the feed accomplishes dual band dual-circular-polarization.Simulation results of the design feed show that the satisfied impedance and pattern characteristics for the interested bands are obtained,and the design can meet the requirement of dual band communication for deep space exploration.