Abstract
This paper propose a new method for improving shielding effectiveness (SE) of a rectangular enclosure with multiple circular apertures. In this method in order to compensate the effects of the apertures on (SE) parameter, we use two metallic walls each containing apertures instead of the one wall. By using two walls for shielding an enclosure, the shielding effectiveness of the enclosure will improve. The numerical simulation uses a symmetric condensed node of TLM – TD (Transmission line Modeling Method – Time Domain) and subsequent Fourier Transform and the result was verified by HFSS and CST software. We obtain the shielding effectiveness response to an electric field impulsive excitation. It is shown that field polarization and enclosure direction has a noticeable effect on SE that should be considered in SE calculations. The effect of different parameters and improving the shielding effectiveness of a metallic enclosure with extra wall is studied. An optimization of the influence of the place of apertures in the walls and the diameter of circles on two walls is presented.
Highlights
Nowadays, regarding the electromagnetic immunity and electromagnetic interferences of the electronic devices increase the importance of a careful design of shielding enclosures.There are different routes for coupling unwanted signals into shielding structures
Since usually there is a sort of coupling energy into shielding boxes we need to define the quality of a shielding box by introducing the shielding effectiveness (SE) of the enclosure
In order to produce plane wave which is radiated to enclosure a free space volume of 120mm x 300mm x l00mm is placed in front of the aperture
Summary
Nowadays, regarding the electromagnetic immunity and electromagnetic interferences of the electronic devices increase the importance of a careful design of shielding enclosures. There are different routes for coupling unwanted signals into shielding structures. Seams and slots are common path for coupling the energy. Since usually there is a sort of coupling energy into shielding boxes we need to define the quality of a shielding box by introducing the shielding effectiveness (SE) of the enclosure. EMC regulations demands the specific level of shielding effectiveness for shielding structures to meet the defined standards. The shielding effectiveness is defined as the ratio of received power without shielding to the received power with shielding. The Shielding effectiveness metallic enclosure with a square aperture of dimension 60×60mm is analyzed by Transmission Line Method (TLM) in [4] and is improved with using two metallic walls in [5]
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