A new method for load matching in multimode‐microwave heating applicators based on the use of dielectric‐layer superposition

Abstract

8510C Network Analyser. Figures 3 and 4 show the measured radiation patterns in the d-a-b and d-b-a orientations of the DR.The patterns of all the orientations are reasonably broad in both E and H planes. The cross-polarization is ϳ 20 dB, indicating the usefulness of the proposed antenna configuration for mobile communication. It is observed that the gain of the proposed antenna configuration is almost the same as that of a standard circular patch antenna with Ϯ 0.5-dB variation. CONCLUSIONExperiments were conducted on a high-permittivity rectangular DR excited by a 50⍀ microstrip line. It was observed that different resonant modes are excited at different locations of the DR along the feed line. Broad radiation patterns were obtained in almost all orientations, with the main lobe of the radiation pattern remaining normal to the ground plane of the structure with variations in orientation and frequency.

Uniform Electric Field Distribution in Microwave Heating Applicators by Means of Genetic Algorithms Optimization of Dielectric Multilayer Structures

“…This differs from the procedure carried out in [19] since, in that study, these dielectric layers were employed in order to optimize load matching. Previous studies [20]- [22] use this configuration as a matching technique as well, and good results were obtained there with efficiencies above 95%. Other studies use dielectric susceptors as a form of active packaging in order to modify temperature profiles when using microwave heating [23].…”

Load matching in multimode microwave‐heating applicators based on the use of dielectric‐layer moulding with commercial materials

“…In a previous work, a novel load-matching method based on the use of dielectric-layer superposition around a sample was presented, tested, and validated for a multimode microwave-heating cavity [1]. An iterative procedure was implemented to find the best dielectric multilayer configuration for a given dielectric load.…”

Feedback control procedure for energy efficiency optimization of microwave-heating ovens

“…Common problems of all those methods are the high sensibility 2 to the variation of the dielectric properties, and shape and dimensions of the sample to be heated. Other authors have shown that it is possible to achieve high power efficiencies by using dielectric casts around the sample [3,4]. However, these methods have not been experimentally tested yet, showing only simulated data.…”