Abstract
Because the traditional transmission line method treats electromagnetic waves as excitation sources and the cavity as a rectangular waveguide whose terminal is shorted, the transmission line method can only calculate shielding effectiveness in the center line of the cavity with apertures on one side. In this paper, the aperture coupling effect of different sides was analyzed based on vector analysis. According to the field intensity distribution of different transport modes in the rectangular waveguide, the calculation model of cavity shielding effectiveness in any position is proposed, which can solve the question of the calculation model of shielding effectiveness in any position in the traditional method of equivalent transmission methods. Further expansion of the equivalent transmission lines model is adopted to study the shielding effectiveness of different aperture cavities, and the coupling effect rule of the incident angle, the number of apertures, and the size of the cavity is obtained, which can provide the technical support for the design of electromagnetic shielding cavities for electronic equipment.
Highlights
Due to the continuous improvement of the complexity and integration of electronic equipment and, because the electromagnetic environment is becoming increasingly complex, the electromagnetic sensitivity of electronic devices is getting lower and lower [1]
Robinsion improved the equivalent transmission line method to calculate the effect of the aperture shape, the number of apertures, and the cavity loss on the shielding coefficient of the cavity [7]; Belokour extended it to high-order modes and cavity loss [8]; Renzo has made it possible to calculate the influence of the azimuth and polarization angles on the coupling effect through the improvement of the equivalent transmission line method [9], and Poad F presented the case in Electronics 2018, 7, 52; doi:10.3390/electronics7040052
The frequency of the minimum shielding effectiveness at the center point of the cavity matches the theoretical resonant frequency in each direction shown in Tables 1–3, respectively, which proves the correctness of the improved equivalent transmission line method
Summary
Due to the continuous improvement of the complexity and integration of electronic equipment and, because the electromagnetic environment is becoming increasingly complex, the electromagnetic sensitivity of electronic devices is getting lower and lower [1]. The High Power Microwave finds it easy to pass through these channels into the cavity of the electronic equipment, resulting in greatly reduced shielding effectiveness. Song Hang improved the equivalent transmission line method to calculate the shielding effectiveness of double-layer shielded cavities under the high-order mode [12]. After the analysis of the field strength distribution in the different transmission modes of the equivalent rectangular waveguide is carried out, the calculation of the shielding effectiveness is extended to any position within the cavity to obtain a calculation model of the shielding effectiveness at any position within the multi-sided aperture cavity. The shielding effectiveness of the different aperture cavities was studied further by using the extended equivalent transmission line model, and, the coupling effect rules of the incident angle, the number of openings, and the cavity size were obtained
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