Precise Measurement of Complex Permittivity for High-k Dielectrics, Liquids, and Powders
Hsein-Wen, Chao1*, Tsun-Hsu Chang1
1Department of Physics, National Tsing Hua University, Hsinchu, Taiwan
* Presenter:Hsein-Wen, Chao
We proposed an enhanced field method that determines the complex permittivity by comparing the simulation results and experimental measurement. This method is superior in accuracy especially for the extremely high k dielectric materials, as compared with the traditional cavity perturbation technique. The complex permittivity measurement will be very helpful in clarifying the mechanism of the microwave and material interaction. Firstly, the sample with 5mm of height and 8mm of radius. When the dielectric constant of sample is over 120, the variation of response is heavily dependent on the variation of dielectric constant. The result is very different from preceding viewpoint. In the past measured methods, the higher the variation of dielectric constant and the more unobvious the variation of resonant frequency. However, not all of samples are solid type or easily to be manufactured the solid type. Those materials include liquids and powders. Those liquids are placed inside the teflon’s pillbox to be measured their complex permittivities. For those powders, we can place them on the teflon’s pillbox and employ the effective medium (extrapolated) method to evaluate their complex permittivities. This method not only can be to measure the high-k materials but also can be to extend the liquids and powders.

Keywords: high k , complex permittivity, effective medium method