一种基于缝隙天线阻抗的带缝腔体谐振频率计算方法

发布时间：2018-01-09 01:13

本文关键词：一种基于缝隙天线阻抗的带缝腔体谐振频率计算方法　出处：《电子学报》2017年01期 　论文类型：期刊论文

【摘要】：电磁波经缝隙进入机箱腔体后,会在某些频率点形成驻波而发生电磁谐振,导致腔体屏蔽效能急剧下降.为快速准确预测谐振频率以指导屏蔽腔体设计,本文基于缝隙天线阻抗理论提出一种带缝腔体谐振频率的计算方法.将电磁场用自由空间和腔体格林函数表示,根据缝隙处的边界条件建立等效磁流源的积分方程.通过矩量法求解积分方程,计算出腔体输入阻抗.根据谐振发生时电抗为零或电阻最小,可从频率-阻抗曲线获得谐振频率.本文方法不仅能预测缝隙谐振和低阶模式腔体谐振,还能预测出高阶谐振.与实验和CST仿真结果对比验证了本文方法的准确性及快速性.最后用本文方法分析了腔体和缝隙尺寸以及缝隙位置对谐振频率的影响.
[Abstract]:The electromagnetic wave into the chassis cavity through the gap, will be a standing wave is formed in some frequency points and the occurrence of electromagnetic resonance, lead shielding effectiveness decreased rapidly. In order to quickly and accurately predict the resonant frequency in order to guide the design of shielding, slot antenna impedance theory put forward a calculation method of slit cavity resonance frequency based on the electromagnetic field in free space and. Green said that according to the function of the cavity, the gap integral equation boundary conditions equivalent magnetic current source. By using the moment method for solving the integral equation, the calculated input impedance. According to the resonance cavity occurs when the reactance is zero or minimum resistance, can be obtained from the resonant frequency frequency impedance curve. This method not only can predict the resonant gap and low order mode resonance cavity, but also can predict the higher-order resonance. Compared with the results of the simulation experiment and CST verified the accuracy and rapidity of the method in this paper. Finally this paper The influence of the cavity and gap size and the gap position on the resonant frequency is analyzed.

【作者单位】：电子科技大学机械电子工程学院;
【基金】：国家自然科学基金(No.51175068) 高等学校博士学科点专项科研基金(No.20130185110032)
【分类号】：TN06;TN823.24
【正文快照】： 1引言电子设备机箱由于装配等原因不可避免地存在缝隙,缝隙是影响机箱屏蔽效能的重要因素.电磁波经缝隙进入机箱腔体后,会在某些频率点形成驻波而发生电磁谐振,导致腔体屏蔽效能急剧下降,甚至出现屏蔽效能为负.因此,如果电子设备的工作频率位于谐振频率附近,则将受到高强度的

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