Prediction for the electromagnetic coupling characteristics of a metallic enclosure with apertures

Aiming at prediction for the electromagnetic coupling characteristics of a metallic enclosure with a rectangular aperture,this paper proposes a hybrid approach which applies the mode-matching technique and the mixed potential integral equation based on the method of moments.The effects of high-order modes,aperture shape,aperture thickness,and polarization direction of incident wave are all considered in the simulation.The simulation results are compared with data obtained by measurement and finitedifference time-domain method to validate the accuracy and the efficiency of the proposed approach.The research shows that there is an obvious resonance when electromagnetic waves penetrating the metallic enclosure with a rectangular aperture;the coupling electric fields around the aperture and center of the enclosure are enhanced at the resonant frequency;with the thickness of the apertures growing,the coupling electric fields weaken;when the polarized direction of the incident wave is parallel to the short side of the rectangular aperture,the coupled electric fields attain the maximum.