Electro/magnetic shielding effectiveness of soft magnetic Fe80Nb6B14 amorphous alloy

✍ Scribed by G. Haneczok; R. Wroczyński; P. Kwapuliński; A. Chrobak; Z. Stokłosa; J. Rasek

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 495 KB
• Volume: 209
• Category: Article
• ISSN: 0924-0136
• DOI: 10.1016/j.jmatprotec.2008.05.026

✦ Synopsis

Application of the Fe 80 Nb 6 B 14 amorphous alloy to electromagnetic shielding was examined in detail using different experimental techniques. For shields made of the optimized (annealing at 700 K/1 h) amorphous ribbons the shielding effectiveness b was measured versus frequency f and shield thickness h. It was shown that for h = 200 m in the frequency range 2 MHz < f < 15 MHz (the near-zone, electric field) b decreases from 55 dB to 20 dB. In the frequency range 0.2 kHz < f < 10 kHz (the near-zone, magnetic field) b > 20 dB. The best shielding effectiveness, i.e. b > 100 dB was obtained for electromagnetic field in the frequency range 200 MHz < f < 1000 MHz (the far-zone).