首先利用恒温恒湿和高压锅两种处理条件对覆铜板基材进行湿热处理,然后用介质谐振腔(Split Post Dielectric Resonator,SPDR)法分别测出处理前后的介电常数Dk和介质损耗角正切Df值,研究两种湿热处理条件对Dk和Df值的影响。使用此方法,...首先利用恒温恒湿和高压锅两种处理条件对覆铜板基材进行湿热处理,然后用介质谐振腔(Split Post Dielectric Resonator,SPDR)法分别测出处理前后的介电常数Dk和介质损耗角正切Df值,研究两种湿热处理条件对Dk和Df值的影响。使用此方法,对低介电常数覆铜板(Low Dk FR-4)进行了测试,并得出相应的结论。展开更多
本文介绍了使用SPDR(Split Post Dielectric Resonator)法研究高频下,湿热环境对覆铜板基材介电常数Dk和介电损耗角正切Df的影响,用恒温恒湿处理箱,将温湿度设为85℃和85%RH处理样品,并分别测出处理前后的Dk和Df值。使用此方法,对普通F...本文介绍了使用SPDR(Split Post Dielectric Resonator)法研究高频下,湿热环境对覆铜板基材介电常数Dk和介电损耗角正切Df的影响,用恒温恒湿处理箱,将温湿度设为85℃和85%RH处理样品,并分别测出处理前后的Dk和Df值。使用此方法,对普通FR-4、无卤FR-4、Low Dk FR-4进行了测试,效果良好。展开更多
In the light of fractal geometry theory, the characteristics of coal's electric parameters (including dielectric constant, alternating conductivity, dielectric loss angle tangent and electric polarization constant...In the light of fractal geometry theory, the characteristics of coal's electric parameters (including dielectric constant, alternating conductivity, dielectric loss angle tangent and electric polarization constant) were studied by using literature data. The results are shown that the electrical properties of coal have fractal characteristic. The fractal dimensions of dielectric, alternating conductivity, dielectric loss angle tangent were obtained, and are relative to the content of pyrite sulfur, heat and ash content of coal.展开更多
基金Supported by Key Project of Chinese National Programs for Fundamental Research Development(973 Project 2005CB221502)
文摘In the light of fractal geometry theory, the characteristics of coal's electric parameters (including dielectric constant, alternating conductivity, dielectric loss angle tangent and electric polarization constant) were studied by using literature data. The results are shown that the electrical properties of coal have fractal characteristic. The fractal dimensions of dielectric, alternating conductivity, dielectric loss angle tangent were obtained, and are relative to the content of pyrite sulfur, heat and ash content of coal.
