Advances In Microwave And Rf Processing by M. Willert-Porada

By M. Willert-Porada

This booklet is meant to supply non-specialists an outline of the cutting-edge in microwave and excessive frequency undefined, size, and modelling in addition to to provide the experts perception into the main complex R&D themes of microwave and excessive frequency various disciplines. It offers not just with the applying of radiation of three hundred MHz to three hundred GHz frequency to synthesis, heating or ionisation of subject but in addition with new release, transmission, and detection of microwave and radio frequency radiation. the subjects have been chosen from contributions of the eighth overseas convention on Microwave and excessive Frequency Heating, organised by means of AMPERE and held in September 2001 in Bayreuth, Germany. The papers have been referred by way of significant experts within the respective box.

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5 has been considered as a representative example for the simulation. The dielectric constant corresponds to a powder material with high water content, typical of some food products. 6 electromagnetic field simulator. 45 GHz and a TE10 excitation, assumed as the only mode existing at the cavity ports with a 1 V/m peak to peak amplitude electric field. A magnetic wall is used in order to reduce the number of unknowns in the FEM simulation by exploitation of the symmetry of the problem and shortening the simulation time without loss of accuracy.

Such technological applications require gyrotrons with the following parameters: f > 24 GHz, Pout = 10 - 30 kW, CW, K > 30%. The present state-of-the-art of in- 20 Thumm dustrial CW gyrotrons for technological applications in the frequency range from 23 to 84 GHz is summarized in Table 2 [7, and references given there]. Table 2. Performance parameters of present industrial CW gyrotron oscillators for technological applications [7]. 6 38 14 40 30 40 80 roomtemp. roomtemp. mag. mag. 5 36 13 28 12 10 30 10-40 20 10-40 25 50 50 32 24 42 35 30-40 35 30-40 12 33 25 25 25 26 26 25-30 30 25-30 roomtemp.

This is due to the fact, that the sample radius is Design Guideliness for Applicators Used in The Microwave Heating 35 slightly bigger than one wavelength inside the material at the operating frequency. One maximum appears in the centre and two other near the surface of the sample in the propagation direction. However, in the x direction there is a variation of amplitude that can not be suppressed since it is due to the transverse variation of the TE10 mode. It should be pointed out, that in this configuration only a small fraction of the incident power from one of the two generators is absorbed by the sample, and all the remaining microwave power will be transmitted to the other generator.

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