摘要
介绍了透波材料毫米波复介电常数自动测试方法,采用高Q腔一腔多模扫频(18～40GHz)方法测试了微波低损耗圆盘状介质材料,谐振腔工作在TE10p模式,电场的极化方向平行于样品表面。为适应毫米波段材料测试的要求,在设计测试用宽频高Q值谐振腔时,改变以往工作中腔壁开槽位置以抑制TM1mn简并模,对测试用谐振腔的设计大大减小了测试误差。用此系统对几种低损耗材料进行测量,结果证明谐振腔有效抑制了干扰模式,减小了测试误差。对测试结果进行了误差分析,系统的最可几测试误差为:|Δεr/εr|=2%;|Δtanδ|=10%tanδ+5×10-5。
The complex permittivity of low loss microwave dielectric disk was measured by applying high Q faetor cylindrical cavity working in multimode. The cavity worked in TE10p mode , the polarization direction of electric field was parallel to the plane of the disk. Because of high measurement frequency, we displased the groove which separated resonant frequency of the degenerating TM1mn mode to the uper end plate of the cavity and decreased the groove between dielectric disk and cavity wall. As a result, the error of measurement is greatly decreased. The complex permittivity of several kinds of low-loss material were measured by using this method mentioned in this paper. The results were satisfactory. The maximum random error： ｜ △εr/εr｜=2%;｜△tanδ｜=10%tanδ＋5×10^-5.
出处
《宇航材料工艺》
CAS
CSCD
北大核心
2009年第1期82-84,共3页
Aerospace Materials & Technology
关键词
圆柱谐振腔
复介电常数
微波测试
Cylindrical cavity, Complex permittivity, Microwave measurement
