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Electronics
Special Issues
Microwave Devices: Analysis, Design, and Application
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Microwave Devices: Analysis, Design, and Application

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

Deadline for manuscript submissions: 20 August 2024 | Viewed by 6114

Special Issue Editors

Dr. Tonino Pisanu

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Guest Editor
National Institute for Astrophysics, Astronomical Observatory of Cagliari, 09047 Selargius, Italy
Interests: microwave components; radar; radio astronomy receivers
Special Issues, Collections and Topics in MDPI journals
Dr. Paolo Maxia

E-Mail Website
Guest Editor
National Institute for Astrophysics, Astronomical Observatory of Cagliari, 09047 Selargius, Italy
Interests: microwave components; antennas; radar; radio astronomy receivers
Dr. Giacomo Muntoni

E-Mail Website
Guest Editor
Dipartimento di Ingegneria Elettrica ed Elettronica,Università degli Studi di Cagliari, 09124 Cagliari, Italy
Interests: microwave components; printed antennas; antennas for medical applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Microwave devices are the fundamental components of microwave systems purposely employed in the generation, amplification, manipulation, detection, and measurement of microwave signals (within the frequency spectrum ranging from 300 MHz to 300 GHz). They can be classified as active or passive components. With plenty of applications, including telecommunications, remote sensing, material characterization, radar, radioastronomy and many others, the technological advancement in this field has witnessed impressive progress. New materials, clever layouts, tentative fabrication, and measurement techniques are appealing for knowledge sharing in the scientific community.

The aim of the Special Issue on “Microwave Devices: Analysis, Design, and Application” is to exchange experiences and research information on the theory, design, and simulation processes as well as the application of these devices.

The main topics of this Special Issue cover the entire pipeline of microwave device development, including below but not limited to the following:

  • Electromagnetic theory of signal propagation and processing;
  • Electromagnetic CAD software tools to design and simulate microwave components;
  • Technology and processes: fabrication, materials, and assembly;
  • Measurement techniques to characterize the performances in different conditions (ambient or cryogenically cooled temperatures).

Dr. Tonino Pisanu
Dr. Paolo Maxia
Dr. Giacomo Muntoni
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

  • radioastronomical receivers
  • cryogenic temperatures
  • microwave devices
  • antennas
  • feed horns
  • waveguide components
  • low noise amplifiers
  • directional couplers
  • waveguide to coaxial transitions
  • polarizers
  • ortho mode transducers

Published Papers (4 papers)

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Research

14 pages, 2933 KiB  
Article
A Novel Compact Gysel Power Divider with Bandpass Filtering Responses
by Zeyu Wu, Zihao Chen and Kaixu Wang
Electronics 2023, 12(17), 3578; https://doi.org/10.3390/electronics12173578 - 24 Aug 2023
Viewed by 779
Abstract
This study presents a novel compact design of the Gysel topology and a filtering power divider (FPD) that utilizes a coupling structure. The proposed design replaces the traditional four-quarter wavelength transmission lines of the Gysel power divider with transmission lines and lumped components, [...] Read more.
This study presents a novel compact design of the Gysel topology and a filtering power divider (FPD) that utilizes a coupling structure. The proposed design replaces the traditional four-quarter wavelength transmission lines of the Gysel power divider with transmission lines and lumped components, resulting in a significantly reduced circuit size. Furthermore, the introduction of this coupling structure ensures the integration of the filtering and power division functions. Two transmission zeros are created near the passband to enhance the frequency selectivity of the responses. Theoretical analysis is carried out, and closed-form equations are derived based on the even–odd-mode method. To validate the theory, a three-port equal Gysel FPD operating at 2 GHz was designed and fabricated. The simulated and measured results demonstrate that this FPD has good power splitting and filtering capability with the size of 0.15 λg × 0.25 λg (λg is the medium wavelength of the central frequency), which is a significant reduction compared to the existing Gysel FPDs. The simulated and measured results are presented to verify the theoretical derivation, demonstrating good features, such as a return loss greater than 15 dB, isolation greater than 15 dB, and an insertion loss of about 4.02 dB (3 + 1.02 dB) in the passband. Full article
(This article belongs to the Special Issue Microwave Devices: Analysis, Design, and Application)
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21 pages, 22447 KiB  
Article
Design of UWB Filtering Impedance Transformers and Power Dividers Using Stepped-Impedance Resonators
by Ziheng Cao, Yun Liu, Chen Liang and Irfan Majid
Electronics 2023, 12(13), 2800; https://doi.org/10.3390/electronics12132800 - 25 Jun 2023
Cited by 1 | Viewed by 905
Abstract
This study presents a novel design of ultra-wideband (UWB) impedance transformers and power dividers with filtering capabilities. Based on the UWB impedance matching network, the UWB filtering impedance transformers are designed, and the UWB filtering power dividers are achieved by impedance transforming one [...] Read more.
This study presents a novel design of ultra-wideband (UWB) impedance transformers and power dividers with filtering capabilities. Based on the UWB impedance matching network, the UWB filtering impedance transformers are designed, and the UWB filtering power dividers are achieved by impedance transforming one port of one or more impedance transformers. The transformers consist of a multi-mode stepped-impedance resonator (SIR) and defected ground structures (DGSs). The SIR is tightly coupled to two ports of different impedance levels via the unsymmetrical two-sided coupled lines and DGSs. In addition, two transformers that convert impedance from 50 Ω to 100 Ω are connected to form a UWB power divider with filtering function. The 25 Ω port of an impedance transformer with a 50 Ω to 25 Ω conversion is impedance matched to two 50 Ω ports connected in parallel, resulting in another power divider with filtering function. Thus, two prototype UWB impedance transformers from 50 Ω to 100 Ω and from 50 Ω to 25 Ω are designed and their corresponding power dividers are also designed and fabricated. The simulated and measured results are consistent, demonstrating good features, such as return loss greater than 10 dB and insertion loss less than 4.5 dB in the passband, UWB filtering capacity with out-of-band rejection greater than 20 dB, and compact size smaller than 1.2λ × 2.1λ (λ is the wavelength of the central frequency). Full article
(This article belongs to the Special Issue Microwave Devices: Analysis, Design, and Application)
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14 pages, 8969 KiB  
Article
A Compact Fourth-Order Tunable Bandpass Filter Based on Varactor-Loaded Step-Impedance Resonators
by Shuang Li, Shengxian Li and Jianrong Yuan
Electronics 2023, 12(11), 2539; https://doi.org/10.3390/electronics12112539 - 05 Jun 2023
Cited by 3 | Viewed by 1211
Abstract
In this paper, a compact high-selectivity frequency tunable bandpass filter (BPF) with constant absolute bandwidth (ABW) based on varactor-loaded step-impedance resonators (SIRs) is presented. By introducing cross coupling between resonators, a pair of transmission zeros (TZs) close to the passband are produced and [...] Read more.
In this paper, a compact high-selectivity frequency tunable bandpass filter (BPF) with constant absolute bandwidth (ABW) based on varactor-loaded step-impedance resonators (SIRs) is presented. By introducing cross coupling between resonators, a pair of transmission zeros (TZs) close to the passband are produced and the selectivity of the filter is enhanced significantly. Another pair of TZs are generated to improve the out-of-band rejection by using source-load coupling. The varactor-loaded SIRs are utilized to design the compact fourth-order tunable BPF in order to realize wide tuning range and compact size. In addition, the frequency-dependent coupling feeding structures are employed instead of lumped capacitors used in conventional feeding structures, as a result, the insertion-loss performance is improved. The simulated and measured results are presented and show good agreement. The measured results exhibit a tuning range from 0.8 to 1.14 GHz with a 3 dB constant ABW of about 47 ± 5 MHz, the return loss of the filter is greater than 13.9 dB, and the insertion loss is about 2.7–3.1 dB. Moreover, four TZs are generated, and the proposed tunable filter shows high selectivity with a rectangular coefficient of 2.3–3.1. Full article
(This article belongs to the Special Issue Microwave Devices: Analysis, Design, and Application)
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14 pages, 3057 KiB  
Article
Design of a Compact Ultra-Wideband Microstrip Bandpass Filter
by Chen Li, Zhong-Hua Ma, Jia-Xiang Chen, Meng-Nan Wang and Jian-Mei Huang
Electronics 2023, 12(7), 1728; https://doi.org/10.3390/electronics12071728 - 05 Apr 2023
Cited by 8 | Viewed by 2644
Abstract
A compact ultra-wideband bandpass filter based on a multilayer printed circuit board (MPCB) structure is proposed in this paper. RO4450F prepreg is used to bond three RO4350B dielectric substrates with different thicknesses in the MPCB structure. The upper surfaces of the three dielectric [...] Read more.
A compact ultra-wideband bandpass filter based on a multilayer printed circuit board (MPCB) structure is proposed in this paper. RO4450F prepreg is used to bond three RO4350B dielectric substrates with different thicknesses in the MPCB structure. The upper surfaces of the three dielectric substrates are respectively provided with copper-coated structures with different patterns. The blind holes and the defected ground structure (DGS) are added to the MPCB of an ultra-wideband bandpass filter. Two groups of loaded quarter-wavelength terminal-open stubs introduce two transmission zeros, which improves the roll-off rates and stopband characteristics, while simple DGS composed of rectangular slots introduces two resonance points in the passband to improve the return loss. Simulation and measurement are consistent. The insertion loss at the center frequency of 12.795 GHz is 0.58 dB and the fractional bandwidth of 3 dB is 40.33% from 10.215 GHz to 15.375 GHz. This bandpass filter can be widely used in wireless and satellite communication. Full article
(This article belongs to the Special Issue Microwave Devices: Analysis, Design, and Application)
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