半模基片集成波导增益均衡器的设计和实现

针对增益均衡器小型化的发展趋势和要求，设计了多子结构单元级联的Ku波段的半模基片集成增益均衡器.谐振子单元与主传输线在三层介质基板上，成空间立体分布，构成七层结构；提出了利用多节微带线枝节进行阻抗匹配的过渡带设计方法，根据坐标变换分析得到HMSIW谐振腔的主模；采用羟基铁填充的吸收柱阵列调节衰减量和Q值，给出了该结构均衡器的设计步骤.与微带均衡器相比，该均衡器提高了Q值，减小了损耗.测试结果表明，该结构保持了和腔体类均衡器相同的性能，同时缩小了体积，实测结果与目标均衡曲线吻合度较好，最大差值为0.6dB.行波管与均衡器联测后，输出增益波动小于±0.4dB.

The Design and ReaIization of HaIf Mode Substructure Integrated Waveguide Gain EquaIizer

The miniaturization of gain equalizer has been becoming the main tendency of theequalizer′s research and development.This paper designs a half mode substrate integrated waveguide (HMSIW)equalizer which has seven layers structures and multiplecascaded substructure units,and the resonant unitsand transmission line distribute at three-layers die-lectric substrates,working at Ku waveband.The transition design of multimicrostrip line segments impedance matching is proposed and the dominant mode of HMSIW resonant cavity is gotten based on coordinate transform theory.The design method is summarized.Compared with microstrip equalizers,this structure has higher Q-factor and lower loss.What’s more,with the use of absorbing pillar arrays,the attenuation and Q value can be easily tuned;test result shows that it has smaller size than the traditional cavity equalizers with the same performance,the measured curve and simulation curve are in good agreement,and the maximum error is 0.6dB.The output gain fluctuation of TWTA is less than ±0.4dB with the e-quipped HMSIW equalizer.