估算双层屏蔽腔体窄缝耦合的混合方法
Hybrid algorithm for slot coupling of double layer shielding cavity
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摘要: 用混合方法计算双层屏蔽腔体窄缝耦合时，外腔体的窄缝耦合用传输线模型计算，内腔体的用磁偶极子模型计算。混合法可以求出双层屏蔽腔体内的场分布和屏蔽系数的分布规律，避免了传输线模型只能计算腔体中心线上的屏蔽系数而不能分析腔内横截面上耦合场分布规律的缺点。将得到的窄缝耦合的传输线模型和磁偶极子模型的计算结果与实测值和Micro-Stripes软件仿真值进行对比，验证了传输线和磁偶极子模型的有效性。混合方法给出了窄缝数量及腔体内不同观测点对屏蔽系数的影响，结果表明：双层屏蔽腔体的屏蔽效能明显优于单层屏蔽腔体；随着相同尺寸的窄缝数量的递增，腔体内的屏蔽系数递减；在与双层屏蔽腔体中心线垂直的横截面上，观测点屏蔽系数以中心线上点为中心，沿窄缝方向向两边递增，也就是离中心线越远，腔体内的耦合电场越弱，且混合法的速度明显快于软件计算速度，适合于高频范围的分析。Abstract: A hybrid method for shielding efficiency or coupling efficiency estimation of slot in double-layer shielding cavity is presented. The coupling efficiency of outer slot is calculated by the transmission line model and the coupling efficiency of inner slot is based on the coupling theory of small holes and its equivalent model of magnetic dipole, which is excited by magnetic current. The distribution of electric field and the rule of shielding efficiency in inner cavity is obtained by the hybrid method. The validity is given by the well matched of trasmission line model, magnetic dipole, Micro-Stripes software simulated data and measured data. The result of the hybrid method exhibit the relationship between the slot position, slot number and the shielding efficiency of different watching poi
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