窄缝耦合的快速估算法
Fast estimation of shielding efficiency of cavity with thin slots
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摘要: 基于小孔耦合理论和腔体格林函数，提出了长宽比大于10的窄缝耦合的快速算法，并与Micro-Stripes软件的计算结果进行比较，两者基本一致。研究了窄缝位置、数量及腔体尺寸对屏蔽效能的影响，结果表明：每增加一条相同尺寸、相同取向的窄缝可使腔体的腔体屏蔽效能下降约6 dB;窄缝长度不变的条件下，长宽比每增大1倍则屏蔽效能增加1 dB，并且增大腔体任一方向的尺寸都可以使屏蔽效能增大；除腔体的谐振频率与软件计算结果稍有差异之外，快速算法与软件的计算结果吻合很好，而快速算法的速度远大于软件计算速度，且适合于高频范围。Abstract: A fast semi-empirical and semi-analytical method for shielding efficiency (or coupling efficiency) estimation of slot with large length-width ratio is presented. The method is based on coupling theory of small holes and Green’s functions of rectangular cavity excited by magnetic current. The result of the method matches well with that obtained by Micro-Stripes software and the measured result. The relationship between slot position, slot number, cavity volume and the shielding efficiency is analyzed. Calculation result shows that the shielding efficiency will degrade by 6 dB when adding a similar slot, and that when keeping slot length unchanged, shielding efficiency will increase by 1 dB when the length-width radio is two times larger and that the shielding efficiency will rise when the
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Key words:
- thin slot /
- coupling /
- estimation /
- magnetic dipole /
- green’s function
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