镀镍碳纤维对电磁波屏蔽效能之探讨astudyoftheshielding.pdf

黎明學報 第二十四卷 第二期 中華民國一○二年七月三十一日 JOURNAL OF LEE-MING INSTITUTE OF TECHNOLOGY VOL. 24, NO.2, JUL. 2013 鍍鎳碳纖維對電磁波屏蔽效能之探討 A Study of the Shielding effectiveness of Nickel-plated Carbon Fiber Against the Electromagnetic Wave 孫長春 高振育 許主霖 蘇惟隆 Chang Chun Sun, Jenn Yu Kau, Chu Lin Hsu, Wei Long Su 黎明技術學院 數位多媒體系 Department of Digital Multimedia Technology, Lee-Ming Institute of Technology 摘 要 本文是探討以高導電的鍍鎳碳纖維作為添加物之複合材料對電磁波屏蔽 效能之影響。該片狀之複合材料，是以熱可塑性聚胺酯(polyurethane, PU)為膠 2 合劑 (Binder) ，再以特定製程製作出20x20 cm 之不同厚度及不同鍍鎳碳纖維 含量的片狀成品。接著將該片狀成品分別採用 ASTM D4935規範之同軸測試 法及IEEE-299規範之自由空間測試法，來量測高導電鍍鎳碳纖維複合材料對 電磁波之屏蔽效能，二種方法的測試頻譜範圍不同。同軸測試法之頻譜範圍是 30 MHz～1.5 GHz ，自由空間測試法之頻譜範圍是10 KHz～1.5 GHz 。經由屏 蔽效能的測定，添加 21克之高導電的鍍鎳碳纖維配方，其屏蔽效能均能大於 80dB 以上，亦能符合IEEE-299規範之：實測值≧SEM ≒20 log f - 60的規格。 關鍵詞：鍍鎳碳纖維、電磁波、屏蔽效能、聚胺酯 Abstract This paper is to discuss the influence of the high electrical conductivity nickel-plated carbon fiber on the shielding performance against the electromagnetic wave. The nickel-plated carbon fiber is used as an additive into the thermoplastic polyurethane as the binder to make the composite material. The sheets of composite material are made at the size of 20x20 cm2 of different thickness and various content of nickel-plated carbon fiber. The composite material sheets will be tested by two test methods respectively to measure their shielding effectiveness against the electromagnetic wave: the coaxial test method with the ASTM D4935 specification, and the free-space test method with the IEEE-299 specification. The test spectrum of the coaxial test method ranges from 30 MHz to 1.5 GHz, while that of