Informatics Publishing Limited

G. Sindura ¹, P. Salil ², K. Ram Prakash ³

Affiliations
1 Department of Electronics & Communication Engineering, Kumaraguru College of Technology, Anna University, Coimbatore, TamilNadu, IN
2 EMC division, SAMEER-Centre for Electromagnetics, Chennai, Tamilnadu
3 Department of Electronics & Communication Engineering, Kumaraguru College of Technology, Anna University, Coimbatore, TamilNadu, IN

Abstract

In this paper (i) shielding effectiveness of shielded enclosure with single and multiple apertures (ii) Radiation from PCB without shield (iii) Radiation from PCB with shield are analyzed using computational electromagnetic software tool-FEKO. Electromagnetic shielding involves shielding components from electric and magnetic fields and also preventing electronic devices from sending them out. In order to achieve electromagnetic compatibility, mainly with respect to radiated emission and radiated immunity it is required to have a good shielding effectiveness for the equipment enclosure. Shielding Effectiveness is defined as the ratio of the input field of the unshielded load to that of the shielded one. The shielded enclosure is modelled with both single and multiple apertures. The shielding effectiveness of both enclosures are found. The PCB is modelled with a ground plane at the bottom and a trace at the top. Then the radiations from PCB are analyzed, before and after the shield. The height of the PCB which is kept inside the enclosure is varied to find the variations in radiation.

Keywords

Electromagnetic Shielding, Aperture, Radiated Emission, Shielded Enclosure, Electromagnetic Compatibility.

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G. Sindura ¹, P. Salil ², K. Ram Prakash ³

Affiliations
1 Department of Electronics & Communication Engineering, Kumaraguru College of Technology, Anna University, Coimbatore, TamilNadu, IN
2 EMC division, SAMEER-Centre for Electromagnetics, Chennai, Tamilnadu, IN
3 Department of Electronics & Communication Engineering, Kumaraguru College of Technology, Anna University, Coimbatore, TamilNadu, IN

Abstract

In this paper, (i) Shielding effectiveness of shielded enclosure (ii) radiation from PCB with and without the shield are analyzed using computational electromagnetic software tool-FEKO. Electromagnetic shielding involves shielding components from electric and magnetic fields and also preventing electronic devices from sending them out. In order to achieve electromagnetic compatibility, mainly with respect to radiated emission and radiated immunity it is required to have a good shielding effectiveness for the equipment enclosure. Shielding Effectiveness is defined as the ratio of the input field of the unshielded load to that of the shielded one. The shielded enclosure is modeled with a single aperture in x-z plane and shielding effectiveness of this enclosure is obtained for various incident angle. The PCB is modeled with a ground plane at the bottom and a trace at the top and radiations coming out from this PCB are obtained at various directions. Then the PCB is kept inside the shielded enclosure and the emission from PCB is obtained at various directions. In this case, the PCB acts as the load. The importance of electromagnetic shielding is revealed through this paper.

Keywords

Electromagnetic Shielding, Aperture, Radiated Emission, Shielded Enclosure, Electromagnetic Compatibility.

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S. Deivanai ¹, K. Ram Prakash ¹

Affiliations
1 Electronics and Communication Engineering, Kumaraguru College of Technology, Coimbatore, IN

Abstract

To meet the growing demand for bandwidth in communication, different antennas have to be designed. This paper deals with the design of Hilbert fractal patch antenna for ISM band and wireless sensor network applications. The first structure is CPW feed and the second one has modified ground plane. The dimension of the substrate is 18mm×16.5mm. The first antenna resonates at 1.44 GHz and 3.03 GHz. The bandwidths are 200 MHz and 190 MHz. The return loss is -23 db and -15 db respectively. The electric field is 5.3 db. The second structure with modified ground plane resonates at 7.96 GHz and has a bandwidth of 1.67 GHz. The return loss is -28 db at 7.96 GHz. The Electric field is 16.4 db.

Keywords

Hilbert, Fractal, ISM, CPW.

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