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Microwave/Millimeter Wave Circuits and Systems for Emerging Wireless Applications

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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 12243

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Special Issue Editor

Dr. Girdhari Chaudhary

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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

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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

Open AccessArticle

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 1652

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 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

(This article belongs to the Special Issue Microwave/Millimeter Wave Circuits and Systems for Emerging Wireless Applications)

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14 pages, 4122 KiB

Open AccessArticle

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 3986

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 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

(This article belongs to the Special Issue Microwave/Millimeter Wave Circuits and Systems for Emerging Wireless Applications)

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13 pages, 7510 KiB

Open AccessArticle

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 2550

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 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 (f_L: lower frequency; f_H: 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 f_L does not affect the load of f_H and vice versa. The dual-band tunable PS was fabricated at f_L = 1.88 GHz and f_H = 2.44 GHz, and testing revealed that achieved a PSR of 114.1° with an in-band phase deviation (PD) of ± 8.43° at f_L and a PSR of 114.0° ± 5.409° at f_H 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

(This article belongs to the Special Issue Microwave/Millimeter Wave Circuits and Systems for Emerging Wireless Applications)

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11 pages, 4307 KiB

Open AccessArticle

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 3161

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 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

(This article belongs to the Special Issue Microwave/Millimeter Wave Circuits and Systems for Emerging Wireless Applications)

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