使用模式匹配法和基于矩量法求解的混合位积分方程预估了有孔缝金属屏蔽腔体的屏蔽效能,该算法考虑了孔缝厚度、孔缝形状、入射波极化方向及高次模等因素对屏蔽效能的影响.通过对经典孔缝电磁耦合模型的数值仿真,验证了该算法具有较高的准确性和计算效率.数值仿真表明:当屏蔽腔体上的孔缝为矩形且入射波的电场极化方向平行于矩形缝隙的短边时,对应于该极化方向的腔体屏蔽效能是所有极化方向中最差的;当频率低于主谐振频率时,测试点距离缝隙越近,该点的耦合场越强,屏蔽效能越差;在孔缝面积相同的情况下,正方形孔缝的屏蔽效能要优于矩形孔缝的屏蔽效能.%A rigorous numerical method for the prediction of shielding effectiveness, which adopts the mode-matching technique and the mixed potential integral equation based on the method of moments, has been presented for rectangular metallic enclosure with aperture. Some influence factors, such as aperture thickness, aperture shape, incident polarization direction and highorder modes, are considered. By the numerical simulation of classical models, the high accuracy of this method is verified, and the efficiency of the method is remarkable compared with other numerical algorithms. Furthermore, some valuable conclusions in engineering are obtained: When the polarized direction of the incident wave is parallel to the short side of the rectangular aperture,the coupled energy will attain the maximum; when the frequency is under the dominant resonant frequency, closer to the aperture means more coupling energy; for apertures of the same area, the shielding effectiveness of the square aperture is better than that of the rectangular aperture.
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