電磁波遮蔽性粒片板之研究（II）木材粒片與金屬材料複合製板

Electromagnetic Shielding Particleboard (II) Manufactured from Wood Particles and Metal Materials

黃耀富(Yaw-Fuh Huang) ； 林正榮(Cheng-Jung Lin)

《林產工業》 17卷4期 (1998/12) Pp. 631-645

https://doi.org/10.6561/FPI.1998.17(4).2

摘要

本試驗探討了不同mesh號數的不銹鋼網、不同mesh號數的銅網之層數及複合位置、鋁箔及銅箔層數及複合位置等對粒片板在1.5~2.7 GHz頻率範圍之電磁波遮蔽性質之影響。結果顯示粒片板防電磁波之介入衰減效果，60及120 mesh之不銹鋼網及銅網，板中複合2層者之介入衰減值在30~60 dB 之間；若以120 mesh銅網兩面各複合兩層，介入衰減值可達60~75 dB以上。又各以鋁箔及銅箔於兩板面各複合一層者，其介入衰減效果比二層複合於板中者大，其介入衰減值亦可達60~75 dB以上。另方面粒片板的反射衰減效果，各種金屬網，不論層數、mesh號數、複合位置對複合板之電磁波反射效果均很小，均介於0~0.6 dB之間。銅箔、鋁箔兩種金屬箔複合於板中者之反射衰減值大於複合於板面者，鋁箔者介於0.35~-0.05 dB之間，銅箔者介於0.5~-0.05 dB之間。顯示以各種金屬材料複合之粒片板對測定範圍內之電磁波遮蔽效果完全來自反射效果而非吸收效果。

關鍵字

電磁波 ； 電磁波干擾 ； 電磁波遮蔽性 ； 木質複合材料 ； 介入衰減 ； 反射衰減

並列摘要

In this study, the factors for making electromagnetic shielding particle composites of mesh no. of stainless web, mesh no. and sheet number of copper web and its setting location, and sheet number and its setting location of aluminum foil or copper foil were examined. The results showed that the electromagnetic shielding effectiveness of the board overlaid with 60 or 120 mesh stainless web or copper web is better than that of embedded board. The insertion loss values of these composites are greater than 60-70 dB. The insertion loss values of the composites embedded with 60 or 120 mesh metal web at 1/4 and 3/4 weight ratio of Japanese fir particles are within 30-60 dB. And when the composites overlaid on both sides with 2 sheets of 120 mesh copper web the insertion loss values are greater than 60-75 dB. Another result indicated that when 1 sheet of aluminum foil or copper foil was overlaid on both sides of composite boards, the insertion loss values are greater than 60-75 dB and they are better than that of embedded boards. For the return loss values of the composites made from Japanese fir particles and metal materials are small (0-0.6 dB) in spite of sheet number, mesh no. and setting location of any type of metal web was adapted. When 1 sheet of aluminum foil or copper foil was overlaid on both sides of composites, the return loss value is smaller than that of embedded board which 2 sheets were embedded at 1/4 and 3/4 particles weight ratio, respectively.

並列關鍵字

Electromagnetic wave ； electromagnetic interference ； electromagnetic shielding characteristics ； wood based composites ； insertion (or transmission) loss ； return (or reflection) loss