基于TM0mn模式微波介质材料复介电常数的测量
Measurement of complex permittivity of microwave dielectric materials using TM0mn modes
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摘要: 提出了一种基于闭式谐振腔TM0mn模式测量微波介质材料复介电常数的方法。利用模式匹配技术、Ritz-Galerkin方法以及传输模品质因数测量法导出了介质材料相对介电常数和损耗角正切的测量公式。最后，利用矢量网络分析仪对常用天线罩材料进行了扫频测量，结果表明：高分子量聚乙烯在3~6 GHz范围内的相对介电常数为2.30±0.05，损耗角正切为(1.8~2.0)×10-4。
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关键词:
- 复介电常数 /
- 闭式谐振腔 /
- Ritz-Galerkin方法 /
- 模式匹配 /
- 品质因数
Abstract: A novel method for measuring the complex permittivity of dielectric plates is proposed by using TM0mn modes in a closed cylindrical resonant cavity. The analysis based on the Ritz-Galerkin method, mode matching technique and transmission-mode quality factor measurement method is performed, and the formulas for calculating the complex permittivity are developed. Finally, a sweep-frequency measurement of the complex permittivity is conducted on high molecular weight polyethylene(HMWPE) using an Angilent vector network analyzer. Within the frequency range of 3~6 GHz, the relative permittivity and loss tangent of HMWPE turn out to be 2.30±0.05 and (1.8~2.0)×10-4, respectively. -
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