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本文首先用两个TE_(01n)模螺旋线谐振腔在9—12千兆赫对固体材料的相对介电系数ε′和损耗角正切tanδ作比对测量。其中一个是采用新的tanδ计算方法,在固定长度腔体上进行测量;另一个是采用常用的计算方法,腔体的一个端面是用精密测微器推动不接触活塞构成。用两种腔体所获得的ε′、tanδ结果,一致性很好,其标准误差相当于用一个腔体所获得的误差。进而用固定长度腔体研究了样品相厚度对测量固体材料ε′、tanδ的影响,得出一些对精密测量电介质复介电系数有实用价值的结论。
In this paper, the relative permittivity ε ’and loss tangent tan δ of solid materials are first measured by using two TE_ (01n) -mode helical resonant cavities at 9-12 GHz. One is to use the new tan δ calculation method to measure the length of the cavity; the other is to use a common calculation method, one end face of the cavity is a precision micrometer to promote contactless piston. The results of ε ’and tanδ obtained with the two kinds of cavities are in good agreement with standard errors equivalent to those obtained with one cavity. Furthermore, the influence of sample phase thickness on the measurement of solid materials ε ’and tanδ was studied by using a fixed length cavity, and some conclusions were obtained that the practical value of the complex dielectric coefficient was accurately measured.