Shielding Performance of a Metallic Rack used for Telecommunication Equipment : Simulation and Measurements
The rule regarding the electromagnetic immunity and electromagnetic interference of electronic devices increases the importance of a careful design of shielding enclosures. The prediction of the shielding performance of a metallic rack used for telecommunication devices it has been always a critical point of the global design process. Aim of the present paper is to apply to evaluate the electric field radiated from a defined metallic rack when a source is located inside it. A view of the opened metallic rack is shown in Fig. 1.
Figure 1: Real view of the metallic rack
Fig. 2 depicts a real view and the correspondent electromagnetic model of the loaded monopole antenna used to perform measurements inside a semi-anechoic chamber. The antenna consists on two disks of radius r=48mm, thickness t=0.5mm, distant 1mm one each other and separated by a dielectric material with relative electric permittivity epsilon=8. The leg length is h=95mm, and the first resonance frequency is at 0.65GHz, as confirmed in Fig.3.
Figure 2: Real view and CST MWS model of the used loaded monopole antenna
Figure 3: S11 parameter of the loaded monopole antenna.
The results obtained by means of measurements are presented in Fig. 4 where the vertical and horizontal (Ex and Ey) electric field components registered 3m distant from the metallic opened rack are compared with the corresponding results coming from the numerical simulation.
Figure 4: Comparison between measured results and simulated (CST MWS) results
Very good agreement with the measured results is achieved; this is a clear indication of the effectiveness of numerical modeling of EMC and shielding problems since it allows an analysis to be performed on the model and its general performance to be investigated even before the prototyping stage of the structure.
CST Article "Shielding Performance of a Metallic Rack used for Telecommunication Equipment : Simulation and Measurements"
last modified 27. Jun 2006 5:47
printed 10. Feb 2012 10:58, Article ID 269
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Article ID: 269
Last modified: 27. Jun 2006 5:47
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