期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 70, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2021.3102742
关键词
Broadband characterization; coplanar waveguide (CPW); dielectric characterization and time-domain reflectometry
The broadband reflection technique presented in the study is suitable for measuring the complex dielectric constant of low-loss dielectric slabs using a CPW transmission line sample holder. It is validated through measurements of known Rogers RT/duroid samples and shows good agreement with data reported in materials' datasheets. The technique does not require complicated sample machining and preparation, making it suitable for characterizing materials like glass.
A broadband (1-35 GHz) time-/frequency-domain reflection technique for measuring the complex dielectric constant of low-loss dielectric slabs is presented. The technique uses a coplanar waveguide (CPW) transmission line sample holder for measurements. In addition to the standard substrate materials, the technique is suitable for the characterization of materials, such as glass, as it does not require complicated sample machining and preparation. The procedure is based on comparing the measured effective dielectric constant and the attenuation constants for both the loaded and unloaded CPW line sample holder. The effective dielectric constant and the attenuation constant are first modeled as a function of the real and imaginary parts of the superstrate's dielectric constant using a 2-D numerical line calculator. Samples under test are assumed to be nonmagnetic and have their material resonances at frequencies substantially above 35 GHz. The technique is validated through measurements of known Rogers RT/duroid samples. Measured complex dielectric constants of different materials are in very good agreement with data reported in materials' datasheets.
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