腔体格栅的电磁屏蔽原理与方法

doi:10.7527/S1000-6893.2020.24803

Abstract

Abstract: Inlet grilles can prevent electromagnetic waves from entering the cavity to form strong scattering sources, improve the surface discontinuousness of air vehicles, and thereby reduce their scattering characteristics. Taking the leaning rectangular straight cavity as the research object, this study illustrates the principle of electromagnetic shield using the theory of waveguide mode propagation based on the algorithm of fast multi-pole method. The relationship between the size of the grille and the Radar Cross Section (RCS) is analyzed as well as that between the polarization angle and the direction of the grille. The inhomogeneous grille in the longitudinal and horizontal dimensions is designed based on the principle of destructive interference. Numerical simulations indicate that: compared with that of the homogeneous grille, the RCS of the inhomogeneous grille in the horizontal dimension is reduced beyond 8 dB within the range of ±15° in the front direction. The RCS of the inhomogeneous grille in the longitudinal dimension is clearly reduced within the range of ±35°, and the numerical value is beyond 20 dB within partial angles. Additionally, two layers of grilles are proposed to decrease the depth along axis x and the space between adjacent grilles. Numerical simulations show that: when the space between adjacent grilles is smaller than half of the wavelength, almost the same electromagnetic shielding effects as those of dense single layer of grilles is achieved.

Key words: Radar Cross Section (RCS), cavity grille, waveguide mode, stealth technology, destructive interference

CLC Number:

V211.3

YU Longzhou, CHEN Xian, HUANG Jiangtao, ZHONG Shidong, QUE Xiaofeng. Electromagnetic shielding principles and technologies of cavity grille[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022, 43(1): 324803.

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Electromagnetic shielding principles and technologies of cavity grille

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