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Electronics
Special Issues
New Techniques and Components for Microwave and Radiofrequency Applicator Design
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New Techniques and Components for Microwave and Radiofrequency Applicator Design

A special issue of Electronics (ISSN 2079-9292). This special issue belongs to the section "Microwave and Wireless Communications".

Deadline for manuscript submissions: closed (30 June 2022) | Viewed by 6045

Special Issue Editors

Prof. Dr. Juan Monzó-Cabrera

E-Mail Website
Guest Editor
Department of Information and Communication Technologies, Universidad Politécnica de Cartagena, 30202 Cartagena (Murcia), Spain
Interests: microwave heating and drying processes; microwave applicator design; permittivity measurements; microwave filter design; EM compatibility; microwave calibration and applications of microwave-heating
Prof. Dr. Alejandro Díaz-Morcillo

E-Mail Website
Guest Editor
Department of Information and Communication Technologies, Universidad Politécnica de Cartagena, 30202 Cartagena (Murcia), Spain
Interests: microwave heating applications; numerical methods; permittivity measurement; microwave engineering
Prof. Dr. Lozano-Guerrero Antonio

E-Mail Website
Guest Editor
Department of Information and Communication Technologies, Universidad Politécnica de Cartagena, 30202 Cartagena (Murcia), Spain
Interests: microwave heating applications; electromagnetic compatibility; permittivity measurement; microwave engineering

Special Issue Information

Dear colleagues:

Microwave and RF heating systems must be carefully designed in order to provide high-quality and efficient results. These systems should provide uniform or localized heating and stay in acceptable power efficiency limits and this implies the usage of commercial EM simulators or self-made numerical EM techniques that allow the prediction and optimization of the main parameters of applicators.  Additionally, the increasing amount of solid-state based systems also offer the opportunity to explore new frequency hopping-based strategies in order to achieve more uniform heating patterns and controlled operation. Furthermore, new applications in plasma processing, medical, biological or waste management fields, require new specific applicator designs or components. The aim of this Special Issue is to collect the latest advances on microwave and RF applicator design in different areas.

Potential topics in microwave and RF applicator design areas include but are not limited to the following:

  • New design techniques for monomode and multimode cavities
  • Design of applicators and components for specific applications in food, waste management, medical, biological or chemical/biochemical fields, etcetera
  • Emerging technologies such as solid state applicators
  • New EM modelling and numerical Techniques
  • Microwave plasma applicators and processing (CVD, cleaning, nanoparticles, etc.)
  • Microwave component design and optimization: filters, stirrers, circulators, matching devices, etcetera
  • Frequency sources and power supply design
  • Electronics and microwave devices for microwave-heating and drying monitoring
  • Design and optimization of multimode feeding: leaky-wave antennas, slotted waveguides, multiport optimization, etcetera
  • Design of new radiofrequency applicators and components

Selected papers of AMPERE 2021 conference will be welcome and they will undergo the same review process as external contributions.

Prof. Dr. Juan Monzó-Cabrera
Prof. Dr. Alejandro Díaz-Morcillo
Prof. Dr. Lozano-Guerrero Antonio
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Electronics is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • Microwave heating
  • Radiofrequency heating
  • EM modelling
  • Numerical Methods
  • Solid State technology
  • numerical techniques
  • microwave applicator and components design
  • power supply design
  • microwave cavities

Published Papers (3 papers)

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Research

12 pages, 3878 KiB  
Article
Investigation of the Optimum Diameter of the Ring Reflector for an Axial Virtual Cathode Oscillator
by Wan-Il Kim, Se-Hoon Kim and Kwang-Cheol Ko
Electronics 2022, 11(13), 2002; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics11132002 - 26 Jun 2022
Viewed by 1253
Abstract
The optimum hole diameter of a ring reflector was experimentally investigated using an axial virtual cathode oscillator (vircator) to enhance its microwave power. The ring reflector enhances the microwave power from the axial vircator by forming a cavity. The ring reflector was installed [...] Read more.
The optimum hole diameter of a ring reflector was experimentally investigated using an axial virtual cathode oscillator (vircator) to enhance its microwave power. The ring reflector enhances the microwave power from the axial vircator by forming a cavity. The ring reflector was installed 9 mm behind the anode. The optimum hole diameter of the ring reflector was analyzed through simulations and experiments by changing the diameter from 60 mm to 160. PIC simulations show that the maximum peak microwave power was generated when the hole diameter was 116 mm and enhanced by 210%. The experiments show similar results to the simulations. The largest peak maximum power was 23.67 MW when the hole diameter was 120 mm. The simulations show that the dominant microwave frequency was formed between 5.33 GHz and 6.7 GHz. The experiments show that the dominant microwave frequency was formed between 5.3 GHz and 5.8 GHz. The frequency trend was approximately similar to that of the simulation results. However, the trend depending on the hole diameter was not as obvious as in the simulations. Although the frequency change was not as clear as in the simulations, experiments show that the hole diameter of the ring reflector affects the vircator operation. Full article
(This article belongs to the Special Issue New Techniques and Components for Microwave and Radiofrequency Applicator Design)
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10 pages, 4445 KiB  
Article
A Novel Bandstop Filter Based on Two-Port Coaxial Cavities for the Installation of Metallic Mode Stirrers in Microwave Ovens
by Juan Monzo-Cabrera, Alejandro Díaz-Morcillo, Antonio Martínez-Gonzalez, Antonio Lozano-Guerrero, José Fayos-Fernández, Rafael Pérez-Campos and Juan Luis Pedreño-Molina
Electronics 2022, 11(13), 1989; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics11131989 - 24 Jun 2022
Cited by 1 | Viewed by 1826
Abstract
Metallic stirrers are commonly used in mode-stirred reverberation chambers but are less common in microwave ovens, because the use of a metallic axis creates a coaxial port in the cavity wall where the axis is introduced, which may result in significant microwave leakage [...] Read more.
Metallic stirrers are commonly used in mode-stirred reverberation chambers but are less common in microwave ovens, because the use of a metallic axis creates a coaxial port in the cavity wall where the axis is introduced, which may result in significant microwave leakage levels. However, due to electromagnetic, mechanical, temperature, or chemical requirements, metallic axes must be used in some cases. In this paper, we present a high power coaxial filter that enables the use of metallic stirrers in microwave applications. The filter employs two-port coaxial cavities that are analyzed to determine their design parameters. These cavities are coupled via coaxial lines to achieve proper attenuation levels. The cavities were designed using commercial electromagnetic (EM) software, and a filter prototype was validated using vector network analyzer (VNA) measurements. The simulated and measured results show that a three-stage configuration can achieve attenuations greater than 70 dB at the 2.45 GHz ISM band, allowing the use and external handling of the metallic axis inserted into microwave ovens with negligible microwave radiation leakage. Full article
(This article belongs to the Special Issue New Techniques and Components for Microwave and Radiofrequency Applicator Design)
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10 pages, 2878 KiB  
Article
Cavity Backed Slot Antenna Fed by a Stripline with SIW Structure and Vertical Coaxial Transition for Microwave Solid-State Heating Applications
by Pablo Santón, Ruth De los Reyes and Juan Vicente Balbastre
Electronics 2022, 11(3), 327; https://0-doi-org.brum.beds.ac.uk/10.3390/electronics11030327 - 20 Jan 2022
Viewed by 2220
Abstract
This paper presents a new approach to feed multimode cavities used as microwave applicators for industrial and domestic microwave ovens using solid-state sources operating in the 2.45 GHz ISM (Industrial, Scientific and Medical) band (commonly used for industrial microwave applications). The feeding structure [...] Read more.
This paper presents a new approach to feed multimode cavities used as microwave applicators for industrial and domestic microwave ovens using solid-state sources operating in the 2.45 GHz ISM (Industrial, Scientific and Medical) band (commonly used for industrial microwave applications). The feeding structure consists of a slot on the top side of the applicator cavity. The slot is fed by a shielded asymmetric stripline with a Substrate Integrated Waveguide structure (to preserve the stripline Transversal Electro-Magnetic (TEM) operation within the shield) and is N-connectorized. A first design of the antenna was obtained using state-of-the-art antenna theory assuming free-space radiation. Then, it was refined using a commercial simulation tool based on the Finite Element Method in the frequency domain to achieve VSWR values lower than 1.5 in the source bandwidth (from 2.42 to 2.48 GHz) when the antenna radiates into the applicator cavity. The design parameters of all the components making up this feeding structure are discussed throughout the paper. A prototype was built and measured in the laboratory. The experimental results are presented at the end of the paper along with the simulated ones, showing a very good agreement. Full article
(This article belongs to the Special Issue New Techniques and Components for Microwave and Radiofrequency Applicator Design)
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