高速飞行器等离子鞘套的自适应天线匹配系统设计

为解决高速飞行器表面产生的等离子鞘套对天线造成失配和驻波比劣化的影响,提出了自适应天线匹配的设计方案。通过使用微带定向耦合器实时测量受到等离子鞘套影响的失配天线,系统可根据失配天线的阻抗数值调整天线端口处的Pi型匹配网络参数,以实现天线阻抗的重新匹配。其中Pi型匹配网络的设计没有采用传统的电感方式,而是改用插入损耗小的1/4波长线加变容二极管方式实现,整个系统以S波段为设计频率,实测系统的总插入损耗为0.63 dB。通过实验测试表明,该系统能将失配驻波为10的天线重新调配到驻波1.5以内。

Design of adaptive matching antenna for plasma sheath in high speed aircraft

In order to solve the mismatch and the high standing wave in antenna are influenced by the plasma sheath in the surface of high speed aircraft, an adaptive antenna matching design is proposed.The mismatch antenna with plasma sheath effect was real-time measured by the micro-strip line directional coupler, the Pi type impedance matching network embedded in antenna was performed according to the impedance value of the mismatch antenna, eventual matching of antenna was achieved.The design was not used the inductive component in the Pi type matching network, but instead of a 1/4 wavelength transmission line with low loss varactor.The entire system was designed in S band frequency, the insertion loss of entire system was 0.63 dB by experimental measured.The experimental results show that the system can reconfigure the standing wave of the mismatch antenna from 10 to 1.5.