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Correction charts to obtain the accurate complex permittivity (εr and tanδr) from approximate values εp and tanδp by perturbation method were made on the basis of the rigorous analysis for the TM010 and TM020 modes of a circular cavity. Usefulness of these charts is verified from the measured results for four rod samples (Bakelite, Polyethylene, PTFE, Silica glass).
A measurement method using the TM010 and TM011 mode cylindrical cavity is proposed to measure the accurate relative permittivity εr and permeability μr of ferrite materials. The method is based on the rigorous electromagnetic field analysis using the Ritz-Galerkin method to take into account the effects of the sample insertion holes of a cavity and the material parameters εr and μr. Numerical calculations...
The effective characteristics of high frequency and strong electric field processing were observed. One of the interesting effects is so called non-thermal effect or microwave effect. In order to widely study the non-thermal effect of ceramics sintering and application of material heating, we developed a material processing system by using a 300 GHz gyrotron. This system are consisted of a 300 GHz,...
The effective characteristics of high frequency and strong electric field processing were observed. One of the interesting effects is so called non-thermal effect or microwave effect. In order to widely study the non-thermal effect of ceramics sintering, we developed a material processing system by using a 300 GHz gyrotron. Successful submillimeter wave sintering of partially stabilized zirconia ceramics...
High frequency gyrotrons are characterized by their capacity to generate powerful radiation in millimeter to submillimeter wavelength range. However, a gyrotron produces a spreading radiation with a spatial structure of the TEmn circular waveguide mode. Functional quasi-optical systems to transmit and to tune the waist size of Gaussian beam converted from gyrotron output are necessary to the application...
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