An Experimental Study on New Ag Coated Fabrics as Shielding Material for Electromagnetic Radiation from PCB

Motoshi TANAKA  Hisashi TAKITA  Hiroshi INOUE  Yusuke MAEDA  Mitsuhiro UMEHARA  Makoto TSUNASHIMA  

IEICE TRANSACTIONS on Electronics   Vol.E86-C   No.6   pp.988-994
Publication Date: 2003/06/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Recent Development of Electro-Mechanical Devices (IS-EMD 2002))
Category: Emerging Technologies
Ag coated fabric,  electromagnetic radiation,  shielding,  PCB,  

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As a new material, silver (Ag) coated fabric has been developed, and its use for shielding electromagnetic radiation is expected. In this paper, seven kinds of Ag coated fabrics, woven, knitted and nonwoven by Ag coated fibers, are prepared, and placed over a PCB with a microstrip line, which is used as a noise source. By measuring the input impedance of the microstrip line, the distance between the PCB and the fabric is fixed to 8 mm to reduce the coupling paths. The shielding effect SE of those fabrics was compared by measuring the magnetic near-field with a small shielded-loop probe. In the results, the resonance frequency is dependent on the fabric's length, as well as the case of a copper sheet. Comparing the texture, the SE of woven and nonwoven fabrics is larger than the knitted fabric. Comparing with the copper sheet, the SE of the fabrics is smaller below 200 MHz, but elsewhere is almost the same.