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Analysis of reactive and resistive open waveguide filters for use in microwave‐heating applicators

Francisco J. Clemente‐Fernández (Departamento de Tecnologías de la Información y Comunicaciones, Universidad Politécnica de Cartagena, Murcia, Spain)
Juan Monzó‐Cabrera (Departamento de Tecnologías de la Información y Comunicaciones, Universidad Politécnica de Cartagena, Murcia, Spain)
Juan L. Pedreño‐Molina (Departamento de Tecnologías de la Información y Comunicaciones, Universidad Politécnica de Cartagena, Murcia, Spain)
Antonio J. Lozano‐Guerrero (Departamento de Tecnologías de la Información y Comunicaciones, Universidad Politécnica de Cartagena, Murcia, Spain)
Alejandro Díaz‐Morcillo (Departamento de Tecnologías de la Información y Comunicaciones, Universidad Politécnica de Cartagena, Murcia, Spain)

Abstract

Purpose

The purpose of this paper is to analyze the limitations of conventional reactive and resistive filters employed in the open ports of microwave‐heating applicators, in order to know the limits of these filters as a function of the permittivity of the inner materials.

Design/methodology/approach

CST Studio Suite™ commercial electromagnetic software has been employed to simulate the behaviour of singly and doubly corrugated reactive filters. Additionally, several configurations for resistive filters implemented with water are assessed. Optimization procedures based on genetic algorithms have been used by modifying some geometric parameters of the filters in order to obtain the best possible bandstop response.

Findings

Results show the serious limitations of these filters depending on the electric permittivity of the inner materials.

Practical implications

These limitations restrict the type of the materials that can be processed, so there is a need for new structures which solve these problems.

Originality/value

Although extensively used in many applications, there are few works that analyze the behaviour of these filters as a function of the geometric parameters or the sample permittivity, and therefore this influence needs to be studied.

Keywords

Citation

Clemente‐Fernández, F.J., Monzó‐Cabrera, J., Pedreño‐Molina, J.L., Lozano‐Guerrero, A.J. and Díaz‐Morcillo, A. (2011), "Analysis of reactive and resistive open waveguide filters for use in microwave‐heating applicators", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 30 No. 5, pp. 1606-1615. https://doi.org/10.1108/03321641111152766

Publisher

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Emerald Group Publishing Limited

Copyright © 2011, Emerald Group Publishing Limited