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Microwave/Millimeter Wave Circuits and Systems for Emerging Wireless Applications

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: closed (20 June 2022) | Viewed by 12202

Special Issue Editor


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Guest Editor
Division of Electronics Engineering, Jeonbuk National University (JBNU), Jeonju-si 54896, Korea
Interests: single/multi-band filters; reconfigurable filters; in-band full duplex radio; high-efficiency power amplifier design; negative group delay circuits; magnet-less non-reciprocal circuits and its applications; RF energy harvesting; in-band full duplex antenna; substrate-integrated waveguide filters

Special Issue Information

Dear Colleagues,

Mobile communications have changed people’s daily lifestyles in recent years. Microwave and millimeter-wave circuits and systems play key roles in evolutions of wireless applications such as wireless communication systems (e.g., 4G/5G mobile communication), industrial automation, radar communication, and driverless automotive safety. Emerging applications in wireless (e.g., Beyond 5G, Internet of Things (IoT), Internet of Space (IoS)) demand highly versatile microwave/millimeter circuits and systems.

The purpose of this Special Issue is to host recent research findings in the area of RF/wireless communication that focus on microwave/millimeter active and passive circuits and systems. This issue will serve as a valuable resource for both academic and industrial researchers to understand the state of the art of microwave/millimeter-wave circuit design for emerging applications.

The topics of interest include but are not limited to:

  • Single/multi-band RF/millimeter-wave passive and active components;
  • Single/multi-band RF/millimeter-wave filters, power dividers, impedance transformer;
  • Reconfigurable RF filters and power divider/combiner;
  • RF front-end circuits (amplifiers, filters, antenna);
  • Microstrip line reconfigurable filters;
  • Substrate-integrated waveguide (SIW) filters, power dividers, and antenna;
  • RF self-interference cancellation techniques;
  • In-band full-duplex antenna;
  • Group delay circuits for analog signal processing;
  • RF/millimeter-wave switch for next-generation communication system;
  • RF energy harvesting circuits;
  • Microwave non-reciprocal filters.

Dr. Girdhari Chaudhary
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. Applied Sciences 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

  • RF/millimeter-wave circuit
  • microwave/millimeter-wave active and passive filters
  • power divider
  • antenna
  • reconfigurable filter
  • power amplifiers
  • group delay circuits
  • RF/millimeter-wave switch
  • energy harvesting
  • substrate-integrated waveguide
  • in-band full-duplex
  • microstrip antenna self-interference cancellation
  • negative group delay
  • RF front-end
  • impedance transformer
  • non-reciprocal circuits

Published Papers (4 papers)

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Research

18 pages, 4740 KiB  
Article
Electromagnetic Wave Scattering by a Multiple Core Model of Composite Cylindrical Wires at Oblique Incidence
by George S. Liodakis, Theodoros N. Kapetanakis, Melina P. Ioannidou, Anargyros T. Baklezos, Nikolaos S. Petrakis, Christos D. Nikolopoulos and Ioannis O. Vardiambasis
Appl. Sci. 2022, 12(19), 10172; https://doi.org/10.3390/app121910172 - 10 Oct 2022
Viewed by 1637
Abstract
A complex cylindrical structure consisting of a group of parallel stratified circular lossy dielectric cylinders, embedded in a dielectric circular cylindrical region and surrounded by unbounded dielectric space, is considered in this paper. The scattering of electromagnetic (EM) plane waves by the aforementioned [...] Read more.
A complex cylindrical structure consisting of a group of parallel stratified circular lossy dielectric cylinders, embedded in a dielectric circular cylindrical region and surrounded by unbounded dielectric space, is considered in this paper. The scattering of electromagnetic (EM) plane waves by the aforementioned configuration was studied; the EM waves impinged obliquely upon the structure and were arbitrarily polarized. The formulation used was based on the boundary-value approach coupled with the generalized separation of variables method. The EM field in each region of space was expanded in cylindrical wave-functions. Furthermore, the translational addition theorem of these functions was applied in order to match the EM field components on any cylindrical interface and enforce the boundary conditions. The end result of the analysis is an infinite set of linear algebraic equations with the wave amplitudes as unknowns. The system is solved by the truncation of series and unknowns and then matrix inversion; thus, we provide a semi-analytical solution for the scattered far-field and, as a consequence, for the scattering cross section of the complex cylindrical structure. The numerical results focus on calculations of the electric- and magnetic-field intensity of the far-field as well as of the total scattering cross section of several geometric configurations that fall within the aforementioned general structure. The effect of the geometrical and electrical characteristics of the structure on the scattered field was investigated. Specifically, the cylinders’ size and spacing, their conductivity and permittivity as well as the incidence direction were modified in order to probe how these variations are imprinted on scattering. Moreover, comparisons with previously published results, as well as convergence tests, were performed; all tests and comparisons proved to be successful. Full article
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14 pages, 4122 KiB  
Article
An Ultra-Wideband Vivaldi Antenna System for Long-Distance Electromagnetic Detection
by Jinjing Ren, Hezhihan Fan, Qi Tang, Zhongyuan Yu, Yang Xiao and Xiang Zhou
Appl. Sci. 2022, 12(1), 528; https://doi.org/10.3390/app12010528 - 5 Jan 2022
Cited by 11 | Viewed by 3968
Abstract
Enlarging or reducing the antenna beam width of antennas can improve the positioning capability of detection systems. A miniaturized and easily fabricated ultra-wideband (UWB) antenna system for long-distance electromagnetic detection is proposed in this article. Two ultra-wideband Vivaldi antennae were designed. One was [...] Read more.
Enlarging or reducing the antenna beam width of antennas can improve the positioning capability of detection systems. A miniaturized and easily fabricated ultra-wideband (UWB) antenna system for long-distance electromagnetic detection is proposed in this article. Two ultra-wideband Vivaldi antennae were designed. One was the transmitting antenna with a beam width of 90° or above, the other was a narrow beam antenna array with beam width less than 10°, as a receiving antenna. Both proposed antennae feature broadside gain diagrams with stable radiation patterns and wideband impedance matching in the frequency range between 2.5 GHz and 4 GHz. After detecting their frequency and time-domain behaviors, the detection system can achieve measurements covering a radius of 30 m. Full article
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13 pages, 7510 KiB  
Article
A Reflection-Type Dual-Band Phase Shifter with an Independently Tunable Phase
by Suyeon Kim, Junhyung Jeong, Girdhari Chaudhary and Yongchae Jeong
Appl. Sci. 2022, 12(1), 492; https://doi.org/10.3390/app12010492 - 4 Jan 2022
Cited by 2 | Viewed by 2537
Abstract
This paper presents a design for a dual-band tunable phase shifter (PS) with independently controllable phase shifting between each operating frequency band. The proposed PS consists of a 3-dB hybrid coupler, in which the coupled and through ports terminate with the same two [...] Read more.
This paper presents a design for a dual-band tunable phase shifter (PS) with independently controllable phase shifting between each operating frequency band. The proposed PS consists of a 3-dB hybrid coupler, in which the coupled and through ports terminate with the same two reflection loads. Each reflection load consists of a series of quarter-wavelength (λ/4) transmission lines, λ/4 shunt open stubs, and compensation elements at each operating frequency arm. In this design, a wide phase shifting range (PSR) is achievable at each operating frequency band (fL: lower frequency; fH: higher frequency) by compensating for the susceptance occurring at the co-operating frequency band caused by the λ/4 shunt open stub. The load of fL does not affect the load of fH and vice versa. The dual-band tunable PS was fabricated at fL = 1.88 GHz and fH = 2.44 GHz, and testing revealed that achieved a PSR of 114.1° with an in-band phase deviation (PD) of ± 8.43° at fL and a PSR of 114.0° ± 5.409° at fH over a 100 MHz bandwidth. In addition, the maximum insertion losses were smaller than 1.86 dB and 1.89 dB, while return losses were higher than 17.2 dB and 16.7 dB within each respective operating band. Full article
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11 pages, 4307 KiB  
Article
Additive Manufactured Waveguide for E-Band Using Ceramic Materials
by Florian Hubert, Tobias Bader, Larissa Wahl, Andreas Hofmann, Konstantin Lomakin, Mark Sippel, Nahum Travitzky and Gerald Gold
Appl. Sci. 2022, 12(1), 212; https://doi.org/10.3390/app12010212 - 26 Dec 2021
Cited by 2 | Viewed by 3148
Abstract
Ceramic materials are chemical- and temperature-resistant and, therefore, enable novel application fields ranging from automotive to aerospace. With this in mind, this contribution focuses on developing an additive manufacturing approach for 3D-printed waveguides made of ceramic materials. In particular, a special design approach [...] Read more.
Ceramic materials are chemical- and temperature-resistant and, therefore, enable novel application fields ranging from automotive to aerospace. With this in mind, this contribution focuses on developing an additive manufacturing approach for 3D-printed waveguides made of ceramic materials. In particular, a special design approach for ceramic waveguides, which introduces non-radiating slots into the waveguides sidewalls, and a customized metallization process, are presented. The developed process allows for using conventional stereolithographic desktop-grade 3D-printers. The proposed approach has, therefore, benefits such as low-cost fabrication, moderate handling effort and independence of the concrete waveguide geometry. The performance of a manufactured ceramic WR12 waveguide is compared to a commercial waveguide and a conventionally printed counterpart. For that reason, relevant properties, such as surface roughness and waveguide geometry, are characterized. Parsing the electrical measurements, the ceramic waveguide specimen features an attenuation coefficient of 30–60 dB/m within the E-Band. The measured attenuation coefficient is 200% and 300% higher compared to the epoxy resin and the commercial waveguide and is attributed to the increased surface roughness of the ceramic substrate. Full article
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