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http://dx.doi.org/10.5573/ieie.2016.53.8.076

A Study on the Evaluation Method of Shielding Effectiveness using NFS in Near-Field Tests  

Park, Jungyeol (School of Electronic Engineering, Soongsil University)
Song, Inchae (School of Electronic Engineering, Soongsil University)
Kim, Boo-Gyoun (School of Electronic Engineering, Soongsil University)
Kim, Eun-Ha (Korea Automotive Technology Institute)
Publication Information
Journal of the Institute of Electronics and Information Engineers / v.53, no.8, 2016 , pp. 76-82 More about this Journal
Abstract
In this paper, we evaluated shielding effectiveness (SE) of carbon nanotube (CNT) film using near field scanning (NFS) in near field analysis. We adopted CNT film with deposit carbon density of 5% and thickness of 1mm for evaluation of shielding characteristic. Using a test coupon analogized to an actual IC package, we measured SE according to measuring position and SE according to distances between the CNT film and the test coupon. As a result, the measured SE in the near field varied with frequency. Especially, the measured electric field SE in the center of the test coupon is better than that of the measured edge point of the test coupon where it is affected by fringing effect. The results show that the measured SE in the near field is affected not only by frequency but also by measurement environment such as position and height of the probe and height of shielding film. In conclusion, we should choose proper methods for SE measurement considering interference distance in the electronic control system because there is little correlation between the proposed evaluation method in the near field and ASTM D 4935-10.
Keywords
shielding effectiveness; carbon nanotube film; electromagnetic compatibility; near field scanning; near field probe;
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