Advances in Microwave and Radio Frequency Processing : by M. Willert-Porada PDF

By M. Willert-Porada

ISBN-10: 3540432523

ISBN-13: 9783540432524

This e-book is meant to supply non-specialists an outline of the state-of-the-art in microwave and excessive frequency undefined, size, and modelling in addition to to provide the experts perception into the main complicated R&D subject matters of microwave and excessive frequency diversified disciplines. It offers not just with the appliance of radiation of three hundred MHz to three hundred GHz frequency to synthesis, heating or ionisation of subject but in addition with iteration, 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 way of AMPERE and held in September 2001 in Bayreuth, Germany. The papers have been referred via significant experts within the respective box.

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Extra info for Advances in Microwave and Radio Frequency Processing : Report from the 8th International Conference on Microwave and High-Frequency Heating held in Bayreuth, Germany, September 3-7, 2001

Sample text

Microwave heating of nylon or food defrosting are some examples of materials where runaway processes can appear. More examples and a detailed description of the runaway problem can be found in [1]. In order to avoid such unwanted effects, particular methods for applicator design were developed in the past, to enable either a homogeneous distribution of the electric field in the parts to be heated or to provide measures to better distribute the thermal energy evolution with time. Research work, carried out in the Microwave Heating Group at the Technical University of Valencia, derived some new 32 Balbastre ideas, based on simulation, for an appropriate design of applicators for this kind of materials.

3. Electric field strength (V/m) inside a non-standard 86 mm wide, 10 mm high waveguide with a cylindrical sample of high loss material in the middle of the waveguide. The waveguide is fed from both the left and right sides with a TE10 mode. 77 V/m. The detailed picture of the sample reveals a standing wave inside the sample, produced by the field interactions. 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.

As a conclusion, from these simulations, by only using the monomode approach, it is possible to properly predict low frequencies of the filter and the bandwidth of the attenuation curve. 2 Frequency (GHz) Fig. 5. Effect of stub with b in the final response of the choke. Effect of the open port height (g) and the stub height (d). The influence of these values has been checked manufacturing a doubly corrugated choke with the possibility of modifying the physical dimensions. The filter manufactured, depicted in Figure 5a, is composed of 5 rows of 3 cylindrical rods, instead of square blocks, that can penetrate in the waveguide at a desired depth.

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Advances in Microwave and Radio Frequency Processing : Report from the 8th International Conference on Microwave and High-Frequency Heating held in Bayreuth, Germany, September 3-7, 2001 by M. Willert-Porada


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