Dielectric properties of hardwood species at microwave frequencies
2004
Sahin, H. (Karadeniz Technical Univ., Trabzon (Turkey)) | Ay, N.
Dielectric measurements at 9.8 GHz and 2.45 GHz were made for the three hardwoods Euramerican hybrid poplar, alder, and oriental beech. The method used was based on Von Hippel's transmission line method. The measurements were carried out at room temperature of 20 deg - 24 deg C. The dielectric properties of the wood species were determined for the three principal structural directions at six different moisture conditions, covering the range of 0% to 28% moisture content. Results indicated that the behavior of all wood species studied is quantitatively similar. In general, the dielectric properties increase within the range studied with rising moisture content. The grain direction of the wood also plays a significant role.
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