摘要
在大功率工作环境中,射频电路经常发生电磁泄漏(Electro Magnetic Leak,EML)和无源互调(Passive Inter-Modulation,PIM)等现象。而在同轴谐振器中,不稳定连接缝隙处成为增加电磁泄漏EML和PIM问题风险的隐患部位。文章通过对同轴谐振器等效电路建模和电磁场建模给出了缝隙位置与电磁场表面电流的关系,并分析了3种不同结构同轴谐振腔EML特性。结果表明通过微调连接缝隙,使其有效偏离同轴谐振器的电流波幅点位置,可以降低大功率同轴谐振器的连接泄漏,从而减小无源互调的风险。依据分析结果选取了3种同轴结构(单螺钉连接、法兰内连接、法兰外连接)中连接泄露最小的结构作为大功率器件的基本结构,小批量器件在大功率测试和试验中无EML和PIM现象。
Under the vacuum and high-power condition,an unstable slight gap of connecting structure of a coaxial resonator will have several risks,including PIM（Passive InterModulation）and EML（Electro-Magnetic Leakage）problems.The percentage of gap′s integral of surface current in the whole resonator cavity was analyzed.It shows that the gap′s location is farther away from high surface current strength part of the cavity,the percentageis smaller. Three kinds of coaxial resonators have been simulated. A stable one was presented for reducing those risks.The connection gap of the coaxial resonator is far away from electric field wave nodes available.
出处
《中国空间科学技术》
EI
CSCD
北大核心
2016年第2期81-86,共6页
Chinese Space Science and Technology
关键词
大功率
同轴谐振器
电磁泄露
无源互调
high-power
coaxial resonator
electro-magnetic leak
passive inter-modulation
