一种计算双层带缝屏蔽腔内置传输线响应的混合方法

针对外场激励下双层带缝屏蔽腔内置传输线的终端响应计算问题,提出了一种混合方法。先利用传输线模型计算外腔体内的响应电压,将响应电压转换成内腔体孔缝处的等效磁流。然后利用电磁拓扑方法的BLT方程计算内腔体内置传输线终端的响应电压。计算结果表明:双层屏蔽腔内置传输线的终端响应明显低于单层屏蔽腔的,但在腔体和孔缝的谐振频率处,传输线响应仍然出现了峰值。

Hybrid method to calculate response of transmission lines in double-layer shielding cavity with apertures

In order to make it work well under complex electromagnetic environments, the electronic system is usually required to be installed in the shutter. However, for the ventilation and heat dissipation, it is inevitable to make some tiny apertures on the shielding wall. In order to solve the computational problem of terminal responses of the transmission lines in the double-layer shielding cavity with apertures excited by the exterior field, this paper presents a hybrid method. First, the response voltages are computed in the exterior layer shielding cavity by the transmission line model. After the response voltages transmitted into the equivalent magnetic currents, the BLT equation based on the electromagnetic topology theory can be used to compute the induced voltage of the transmission line in the double-layer shielding cavity. Finally, the numerical results show that the terminal response of the transmission line in the double-layer cavity is weaker than that in the single-layer cavity. And the response of the transmission line reaches its maximum value near the cavity and slot resonance. The analytic results give reference to electromagnetic compatibility and the design of the protection of electronic equipment against the external source.