基于传输线等效法的双腔体屏蔽系数快速算法

Fast prediction algorithm for shielding effectiveness of double enclosures based on transmission line equavilent circuit method

传输线等效法(TLM)是一种常用的开孔腔屏蔽系数快速计算方法,在孔缝耦合系数的计算中考虑了孔缝处的场模式,提高了TLM算法在高频段计算屏蔽系数(SE)的准确性。继而将TLM算法推广到开孔双金属腔屏蔽系数的计算,通过将外腔体中任意位置的电压等效为内孔缝处的辐射电压源,计算得到内腔体中任意位置上的屏蔽系数,解决了已有文献中方法的不足。该算法计算结果与CST仿真结果吻合较好。

The transmission line equavilent circuit method（TLM） is one of the frequently used quick algorithms for shielding effectiveness （SE） prediction of an enclosure. Electromagnetic field modes at the aperture are taken into consideration in the cou- pling coefficient calculation to improve the accuracy of SE at higher frequencies. Then TLM algorithm is developed to calculate the shielding effectiveness of double metal enclosures with apertures on the common wall. The shielding effectiveness of the inner caw ity can be predicted by using the voltage at any position inside the outer cavity to derive the equivalent voltage source at the aper- tures on the common wall. The results calculated by the proposed method are in good agreement with the simulated results using commercial software CST.