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J. Korean Ceram. Soc. > Volume 42(7); 2005 > Article
Journal of the Korean Ceramic Society 2005;42(7): 449.
doi: https://doi.org/10.4191/kcers.2005.42.7.449
Non-Resonant Waveguide Technique for Measurement of Microwave Complex Permittivity of Ferroelectrics and Related Materials
Moongi Jeong, Beomjin Kim, Yuriy Poplavko1, Kazmirenko Victor 1, Prokopenko Yuriy 1, Sunggi Baik
Department of Materials Science and Engineering, Pohang University of Science and Technology
1Department of Microelectronics, National Technical University of Ukraine
ABSTRACT
A waveguide method is developed to study the materials with relatively large dielectric constants at microwave range. Basically, the method is similar to the previous waveguide methods represented by short-circuit line and transmission/reflection measurement methods. However, the complex permittivity is not determined by the shift in resonance frequencies, but by numerical analysis of measured scattering parameters. In order to enhance microwave penetration into the specimen with relatively large permittivity, a dielectric plate with lower permittivity is employed for impedance matching. The influences of air gap between the specimen and waveguide wall are evaluated, and the corresponding errors are estimated. The propagation of higher order modes is also considered. Experimental results for several reference ceramics are presented.
Key words: Microwave complex permittivity, Rectangular waveguide, Non-resonant, Short-circuit line, Transmission, Reflection
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