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1·The working principle of novel single-phase RITHAF (Resonant Impendent Type Hybrid Active filter) and its filtering characteristic are analyzed.

分析了新型单相谐振阻抗型混合电力滤波器的工作原理及滤波特性。

2·In the methods, single feed, more feed and several patches consisting circular polarization are used to feed the antenna and improve the impendent or ar bands.

这些方法分别采用单点馈电，多点馈电或多元组合实现圆极化，均有效拓展了圆极化天线的阻抗匹配带宽和圆极化轴比带宽。