Basic design of adjusting methods on indoor electromagnetic wave absorber using powder-type magnetic wood

为了在日益增加的电磁环境下改善舒适的居住环境，木质电磁波吸收器是一种可能的方法来解决不必要的辐射或减少其对周围地区的影响。研究了考虑材料常数和电磁吸收特性的室内电磁吸波器调节方法的基本设计，结果表明，在一定的吸波频率下，室内粉末型磁木吸波器的设计效果良好。提出了两种方法，一种是在木粉中浸渍磁流体的方法，另一种是在低温下加热粉末型磁性木。这两种方法都可以改变介电常数，在不改变电路板厚度和重量的情况下改变匹配频率。我们的研究结果可用于设计特定吸收频率的室内粉末型磁性木材吸波器。

To improve a comfortable residential environment under the increasing electro-magnetic environment, a woody electromagnetic wave absorber is one possible approach to solving the unwanted radiation or to reduce its impact on the surrounding area. The basic design of adjusting methods on indoor electro-magnetic wave absorber concerning about material constants and electromagnetic absorption characteristic is examined and the methods give good results to design indoor powder-type magnetic wood wave absorbers for a specified absorp-tion frequency. The two methods are proposed, one is a method to impregnate magnetic fluid to wood powder and the other is to heat the powder type magnetic wood in low temperature. Both methods change permittivity and can shift the matching frequency without changing the thickness and the weight of the board.The results from our studies can be used to design indoor powder-type magnetic wood wave absorbers for a specified absorption frequency.