高铝型硅酸铝纤维板介电特性和透波性能

Dielectric Properties and Electromagnetic Wave Transmission Performance of High-Al Aluminum Silicate Fiberboard

采用谐振腔微扰法测量了高铝型硅酸铝纤维板(high-Al aluminum silicate fiberboard,HAF)在915 MHz和2450 MHz频率下,25~1000℃温度范围内的介电参数,并基于电磁波传输线理论计算了HAF的功率透过系数,进而分析了不同影响因素条件下HAF的透波性能。结果表明:在2种频率下,HAF的介电常数和介电损耗因子均在800℃之后明显增大;不同极化模式下,HAF的透波性能显著不同,其在水平极化下的透波性能优于垂直极化,且水平极化下存在使微波发生全透射的Brewster角(50°~53°);HAF的透波性能随厚度的增加而波动,其功率透过系数曲线在0~0.2 m厚度区间出现多个透波峰。

The dielectric parameters of high-Al aluminum silicate fiberboard(HAF) at 915 MHz and 2 450 MHz and 25-1 000 ℃were measured by a resonant cavity perturbation method.The power transmission coefficient of HAF was calculated based on an electromagnetic wave transmission line theory,and the transmission performance of HAF at different affecting factors was analyzed.The results show that the dielectric constant and dielectric loss factor of HAF increase at 800 ℃ and the both frequencies.The transmission performance of HAF is different under different polarization modes.Its transmission performance in a transverse magnetic field is better than that in a transverse electric field,and there is the Brewster angle(i.e.,50°-53°),which fully makes the microwave transmitting in transverse magnetic field.The transmission performance of HAF fluctuates with the increase of thickness,and its power transmission coefficient curve has a multiple transmission peak in the thickness range of 0-0.2 m.