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Electronics
Special Issues
Microwave Devices and Their Applications
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Microwave Devices and Their Applications

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

Deadline for manuscript submissions: 15 September 2024 | Viewed by 1965

Special Issue Editor

Prof. Dr. Jayant Parekh

E-Mail Website
Guest Editor
Department of Electrical and Computer Engineering, Stony Brook University, Stony Brook, NY 11794-2350, USA
Interests: microwave acoustics; microwave magnetics; microwave electronics

Special Issue Information

Dear Colleagues,

The Special Issue of the open-access journal Electronics aims to present both review and research articles on the subject of microwave devices and their applications. Microwave devices may be classified into two groups: passive devices (isolators, attenuators, phase shifters, circulators, directional couplers, waveguide tees, etc) and active devices (klystrons, magnetrons, travelling wave tubes, solid-state amplifiers and oscillators, mixers, etc).  A plethora of applications of microwave devices exist including satellite communications, microwave ovens, RF Identification, radars, wifi, Bluetooth, hotspot, IoT, medical applications, food processing applications, particle accelerators, miniaturized bulk acoustic wave (BAW) filters, etc. The present Special Issue presents review and research articles illustrating different microwave devices and their applications, including recent advances and emerging trends.

Prof. Dr. Jayant Parekh
Guest Editor

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 devices and applications
  • passive and active elements
  • microwave ferrite devices
  • novel microwave devices, e.g., miniaturized bulk acoustic wave (BAW) filters
  • medical applications of microwaves
  • high power microwaves used in food industry and particle accelerators
  • microwave integrated circuits
  • Resonators
  • computer-aided design
  • solid-state generators
  • klystrons
  • magnetrons
  • travelling-wave tubes

Published Papers (3 papers)

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Research

12 pages, 9389 KiB  
Article
Nonlinear Capacitance Compensation Method for Integrating a Metal–Semiconductor–Metal Varactor with a Gallium Nitride High Electron Mobility Transistor Power Amplifier
by Ke Li, Yitian Gu, Haowen Guo and Xinbo Zou
Electronics 2024, 13(7), 1265; https://doi.org/10.3390/electronics13071265 - 28 Mar 2024
Viewed by 389
Abstract
A nonlinear capacitance compensation technique is presented in this paper to enhance the linearity of a power amplifier (PA) in the GaN process. The method involves placing an MSM varactor device alongside the GaN HEMT device, which works as the amplifying unit such [...] Read more.
A nonlinear capacitance compensation technique is presented in this paper to enhance the linearity of a power amplifier (PA) in the GaN process. The method involves placing an MSM varactor device alongside the GaN HEMT device, which works as the amplifying unit such that the overall capacitance observed at the amplifier input is constant, thus improving linearity. This approach is a reliable and straightforward way to improve PA linearity in the GaN process. The proof-of-concept prototype in this study involves the fabrication of a PA device using a standard GaN HEMT process, which successfully integrates the proposed compensation technique and demonstrates excellent compatibility with existing processes. The prototype has a saturation output power of 18 dBm, a peak power-added efficiency of 51.8%, and a small signal gain of 15.5 dB at 1 GHz. The measured AM–PM distortion at the 5 dB compression point is reduced by more than 50% compared to that of an uncompensated device. Furthermore, the results of third-order intermodulation distortion demonstrate the effectiveness of the linearity enhancement concept, with values improved by more than 5 dB in the linear region compared to those of the uncompensated device. All of the results demonstrate the potential utility of this design approach for wireless communication applications. Full article
(This article belongs to the Special Issue Microwave Devices and Their Applications)
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13 pages, 3254 KiB  
Article
Microwave Metamaterial Absorber with Radio Frequency/Direct Current Converter for Electromagnetic Harvesting System
by Jerzy Mizeraczyk and Magdalena Budnarowska
Electronics 2024, 13(5), 833; https://doi.org/10.3390/electronics13050833 - 21 Feb 2024
Viewed by 582
Abstract
This article presents the analysis of the electromagnetic (EM) properties of a novel metamaterial (MM) array in the microwave frequency range. The background for this work is the rapid development of portable devices with low individual energy consumption for the so-called “Internet of [...] Read more.
This article presents the analysis of the electromagnetic (EM) properties of a novel metamaterial (MM) array in the microwave frequency range. The background for this work is the rapid development of portable devices with low individual energy consumption for the so-called “Internet of Things” (IoT) and the demand for energy harvesting from the environment on a micro scale through harvesters capable of powering billions of small receivers globally. The main goal of this work was to check the potential of the novel MM array structure for EM energy harvesting. The proposed MM array was analyzed in the CST Studio simulation environment. This resulted in the determination of the substitute average EM parameters (absorption, reflection, and transmission) of the MM array. Then, the MM array was manufactured, and the simulation results of the MM array parameters were experimentally validated in a microwave waveguide test system. Based on this conclusion, a prototype of the microwave MM absorber, together with an RF/DC converter, was designed and manufactured for harvesting EM energy from the environment. The system’s energy efficiency was evaluated, and its potential application in energy harvesting technology was appraised. Using a microwave horn antenna, the EM energy harvesting efficiency of the prototype was evaluated. It was about 50% at a microwave frequency of about 2.6 GHz. This may make the prototype attractive as an EM energy harvester or bolometric sensor. Full article
(This article belongs to the Special Issue Microwave Devices and Their Applications)
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15 pages, 5931 KiB  
Article
Harmonic Suppressed Wilkinson Power Divider Using Parallel Resonant Shunt Stub
by Yeongmin Jang and Jinho Jeong
Electronics 2024, 13(2), 424; https://doi.org/10.3390/electronics13020424 - 19 Jan 2024
Viewed by 529
Abstract
This paper proposes a harmonic-suppressed Wilkinson power divider (HS WPD) utilizing parallel resonant shunt stubs (PRSSs). PRSSs are integrated into the conventional WPD by adding functionalities such as bandpass filtering, harmonic suppression, and physical port separation. The resonance conditions and design equations of [...] Read more.
This paper proposes a harmonic-suppressed Wilkinson power divider (HS WPD) utilizing parallel resonant shunt stubs (PRSSs). PRSSs are integrated into the conventional WPD by adding functionalities such as bandpass filtering, harmonic suppression, and physical port separation. The resonance conditions and design equations of the PRSS are theoretically derived and verified through circuit simulations. Using the PRSS, we designed an HS WPD operating at 1 GHz. The fabricated HS WPD demonstrated an insertion loss of 3.2 dB at the fundamental frequency, with a wide 3 dB bandwidth of 129%. The harmonic suppression levels at the 2nd and 3rd harmonic frequencies are measured to be 21.0 dB and 25.8 dB, respectively. The measured input return loss at the fundamental frequency was 27.9 dB, whereas the output return loss was 24.6 dB. Additionally, the HS WPD demonstrates isolation levels at the fundamental, 2nd, and 3rd harmonic frequencies, with levels of 29.2 dB, 17.8 dB, and 47.1 dB, respectively. It also exhibited broadband isolation (>8.7 dB) across the frequency range of 100 kHz to 3.35 GHz. The PRSS design allows for the physical separation of the ports without requiring additional circuitry. Compared to previously reported PDs, the proposed design offers multiple functions in a compact size, making it highly suitable for various microwave systems. Full article
(This article belongs to the Special Issue Microwave Devices and Their Applications)
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