Some Aspects Regarding the Optimization of the Electromagnetic Field Propagation in Microwave Structures

Abstract

The paper presents an optimizationprocedure for the distribution of the electromagneticfield in a microwave applicator used for the drying of adielectric. There are shown various applications ofnumerical modelling 3D, using the Method of theFinite Elements, for the study of the heating of somedielectrics with losses, of parallelepiped shape, situatedin a multimode applicator, excited with energy througha wave guide. To determine the electromagnetic fieldwe used the Ansoft HFSS 10.1 programme. Thisprogramme uses the finite elements method and thenodal functions of the first order. The calculationdomain is divided into tetrahedral subdomains and thefield in each subdomain is properly defined by thevalues in the nodes of the tetrahedron. In this paper wepresent the optimization of the distribution of theelectromagnetic field from the following point of view:the placing mode of the wave guide on the applicator.The main problem which appears is represented by thehomogeneity of the field and implicitly of thetemperature in the material.

Keywords

• electromagnetic field
• optimization
• microwave
• dielectric
• numerical modelling
• finite elements method