Abstract
An efficient and practical method to enhance the shielding effectiveness of a rectangular enclosure with aperture against electromagnetic interferences is presented. In this paper an extra aperture as a matched load instead of a shorted waveguide has been proposed. Transmission line matrix method was used for simulation the rectangular enclosure under electromagnetic plane waves and the result was verified by analytical method and CST software. A complete range of simulations were performed to find the optimum size for second aperture. The proposed method resulted in a very good improving of shielding effectiveness of enclosure especially in resonant frequency.DOI: http://dx.doi.org/10.5755/j01.eee.18.10.3071
Highlights
Nowadays by using higher portion of electromagnetic spectrum, electrical and electronic devices used in power and communication respectively are expected to be shielded in order to increase reliability and immunity
It is evident that using an aperture load would improve the shielding effectiveness parameter about 5 dB in resonant frequency of the cavity
In this paper, an efficient and practical method to enhance the shielding effectiveness of a rectangular enclosure with aperture against electromagnetic pulses is represented. In this method using an extra aperture as a matched load instead of a shorted waveguide has been proposed
Summary
Nowadays by using higher portion of electromagnetic spectrum, electrical and electronic devices used in power and communication respectively are expected to be shielded in order to increase reliability and immunity. The equipment is commonly housed into metallic boxes In such structures, the external electromagnetic fields can directly couple energy into the interior through apertures or slots. Electromagnetic shielding is considered as a powerful approach that prevents coupling of unwanted radiated electromagnetic energy into protected equipment, but the efficiency of shielding enclosures is degraded because of the existence of the slots and apertures for signal and power cable penetration , heat dissipation, peripherals and displays. One of the most critical problems about SE parameter of a rectangular enclosure is about its resonant frequency. At this frequency the shielding effectiveness parameter will significantly decrease and the magnitude of the coupled electric and magnetic fields will be greater than the absence of the enclosure. In this study the focus has been on the resonant frequency of enclosure as a crucial problem
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