双极化膜片阵列加载方波导带通滤波器的设计

Design of Dual-polarized Diaphragm-loaded Square Waveguide Band-pass Filter

采用方波导对称加载周期性金属膜片阵列的结构,设计并研制了一个双极化宽带方波导带通滤波器,分析了膜片高度和加载周期这两个关键参数对滤波器滤波特性的影响,获得7.5～14 GHz上插入损耗小于1 dB的实测通带带宽,阻带范围14.5～16.8 GHz,且阻带衰减最大值达到45 dB,正交双极化之间的极化隔离度大于25 dB。该滤波器可很方便的用于宽频带双极化波导天馈系统。

An electromagnetic band gap （EBG） loaded posed by symmetrically loading periodical metal diap ences of insert height and loading period on the BPF square waveguide band-pass filter （BPF） is pro- hragms on each wall of a square waveguide. Influ- performances are analyzed. Experimental results a- gree well with those predicted 7.5 - 14 GHz pass-band with insert attenuation less than ldB and 14.5 - 16.8 GHz stop-band with largest out-band attenuation 45 dB can be obtained. Good dual-polarization iso- lation larger than 25 dB is achieved on the entire band. This BPF can be conveniently applied to dual-po- larization systems.