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The microwave dielectric properties of binary composites made by high dielectric constant ceramic fillers and polyethylene matrix are studied in this paper. Three ceramic powders of fillers with dielectric constants of 100 and 170, respectively, are adopted. The experimental dielectric constants of ceramic dispersions in the polyethylene matrix at microwave(More)
  • Jyh Sheen
  • 2006 IEEE Instrumentation and Measurement…
  • 2006
The various loss aspects of the parallel-plate microwave dielectric resonator for the TE<sub>01delta</sub> mode is studied from a modified field model. The calculation methods of losses are discussed. The analyses on the calculated results of conductor loss and radiation loss are given. By conducting practical measurements to compare with theoretical(More)
  • Jyh Sheen
  • IEEE Transactions on Dielectrics and Electrical…
  • 2007
Microwave measurements of the dielectric constant and loss tangent of homogeneous isotropic samples in rod form, using a closed cylindrical cavity resonator, are described. The measurements are made at the resonant frequency of the TE<sub>01delta</sub> is mode. A new simple field model of the resonator is developed. This model provides a very simple and(More)
This article reports on a study of the dielectric constant measurements of ceramic at microwave frequency by powder mixture equations. The dielectric constants of ceramics are indirectly obtained from the dielectric constants of ceramic-polymer composites. Dielectric properties of heterogeneous mixtures have been investigated by different authors for over(More)
A low loss measurement technique for complex permittivity, using a closed cylindrical cavity resonator, is investigated. The measurements are made at the resonant frequency of the TE<inf>01.&#x03B4;</inf> mode with a new modified field model, which provides a very simple and clear description of the field distribution within the resonator. The various(More)
  • Jyh Sheen
  • 2006 7th International Symposium on Antennas…
  • 2006
Theoretically, the quality factor of a metal resonant cavity will be increased after introducing a lossless dielectric sample. However, for the conventional cavity perturbation method, widely used on the measurements of microwave dielectric properties, this increment of quality factor is not put into the consideration of calculation on loss tangent(More)
The accuracy of an amendment theory on the cavity perturbation technique for microwave dielectric properties measurements has been studied. The accuracy was confirmed by comparisons of experimental results with those measured by another well known measurement method – post resonance technique. Based on the conventional circular aperture coupling structure,(More)
Powder mixture rules derived from the filler particles with the shapes of sphere, cylinder or rod, and lamella or disk with random distributions are studied in this paper. Three ceramic powders of fillers with dielectric constants of 10, 20, and 36, respectively, are adopted. The experimentaldielectric constantsof ceramicdispersions in thepolyethylenematrix(More)
This paper is designed to develop a portable auxiliary system for those visually impaired, such as color blindness or serious low vision, to enhance their visual sensitivity or substitute the original visual function thus improve their life quality. Individual vision model for each user can be constructed and the optimal visual compensation process is(More)