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Micromachines
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Microwave Passive Components, 3rd Edition
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Microwave Passive Components, 3rd Edition

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "E：Engineering and Technology".

Deadline for manuscript submissions: 31 December 2025 | Viewed by 1558

Special Issue Editors

Dr. Lin Huang

E-Mail Website
Guest Editor
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Interests: THz passive devices; THz sensing and communication; electromagnetic and acoustic-based biomedical imaging and sensing
Special Issues, Collections and Topics in MDPI journals
Dr. Weijie Wang

E-Mail Website
Guest Editor Assistant
School of Physical Science and Technology, Southwest Jiaotong University, Chengdu 611756, China
Interests: dielectric properties measurement; programmable metasurface; vacuum electronic devices; millimeter-wave devices
Dr. Guoxiang Shu

E-Mail Website
Guest Editor
College of Electronics and Information Engineering, Shenzhen University, Shenzhen 518060, China
Interests: vacuum electronic devices; millimeter-wave/THz passive devices; dielectric microwave measurement
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Guo Liu

E-Mail Website
Guest Editor
School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China
Interests: vacuum electronic devices; passive pulse compressor; microwave biosensor; dielectric microwave measurement
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nowadays, micro-, millimeter- and terahertz-wave devices and systems are widely used in various aspects of life, such as in 5G/6G communication, vehicle imaging radar, medical, bio-science, security, etc. As is well known, microwave passive components play an important role in the design and application of these devices and systems. Particularly with the development of advanced machining technologies, such as the micro-electro-mechanical system (MEMS), 3D printing, and micro-/nano-machining, the machining accuracy and ability of the passive components have been significantly improved. In addition, over the past two decades, novel concepts and mechanisms have been continually introduced from within or beyond the field of micromachines, which include meta-materials, vortex electromagnetic waves, and spoof surface plasmons. This has resulted in microwave passive devices/components entering a new stage, controlled by information coding. This indicates that the performance of microwave passive devices still has great potential in the future, which may contribute to the miniaturization and integration of RF circuits and devices. This Special Issue is devoted to continuing the exploration for research papers, short communications, and review articles focusing on the theory, modeling, simulation, measurement and applications of passive components, circuits, devices and systems in the microwave-, millimeter-wave and terahertz-wave bands.

We look forward to receiving your contributions to this Special Issue.

  • Theory, modeling, fabrication, measurement and applications;
  • Microwave-, millimeter- and terahertz-wave passive component/devices applied in communication, radar and other systems;
  • Passive component/devices in antennas, filters, biosensors, vacuum electronic devices, pulse compressor, particle accelerator, etc.;
  • Other work related to microwave devices.

Dr. Lin Huang
Guest Editor

Dr. Weijie Wang
Guest Editor Assistant

Dr. Guoxiang Shu
Prof. Dr. Guo Liu
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. Micromachines is an international peer-reviewed open access monthly 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 2100 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

  • theory, modeling, fabrication, measurement and applications
  • microwave-, millimeter- and terahertz-wave passive component/devices applied in communication, radar and other systems
  • passive component/devices in antennas, filters, biosensors, vacuum electronic devices, pulse compressor, particle accelerator, etc.
  • other work related to microwave devices

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Published Papers (3 papers)

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Research

15 pages, 5625 KiB  
Article
Compact Frequency-Agile and Mode-Reconfigurable Antenna for C-Band, Sub-6-GHz-5G, and ISM Applications
by Esraa Mousa Ali, Wahaj Abbas Awan, Anees Abbas, Syed Mujahid Abbas and Heba G. Mohamed
Micromachines 2025, 16(6), 724; https://doi.org/10.3390/mi16060724 - 19 Jun 2025
Viewed by 529
Abstract
This article presents the design and evaluation of a compact-sized antenna targeting heterogenous applications working in the C-band, 5G-sub-6GHz, and the ISM band. The antenna offers frequency reconfigurability along with multi-operational modes ranging from wideband to dual-band and tri-band. A compact-sized antenna is [...] Read more.
This article presents the design and evaluation of a compact-sized antenna targeting heterogenous applications working in the C-band, 5G-sub-6GHz, and the ISM band. The antenna offers frequency reconfigurability along with multi-operational modes ranging from wideband to dual-band and tri-band. A compact-sized antenna is designed initially to cover a broad bandwidth that ranges from 4 GHz to 7 GHz. Afterwards, various multiband antennas are formed by loading various stubs. Finally, the wideband antenna along with multi-stub loaded antennas are combined to form a single antenna. Furthermore, PIN diodes are loaded between the main radiator and stubs to activate the stubs on demand, which consequently generates various operational modes. The last stage of the design is optimization, which helps in achieving the desired bandwidths. The optimized antenna works in the wideband mode covering the C-band, Wi-Fi 6E, and the ISM band. Meanwhile, the multiband modes offer the additional coverage of the LTE, LTE 4G, ISM lower band, and GSM band. The various performance parameters are studied and compared with measured results to show the performance stability of the proposed reconfigurable antenna. In addition, an in-depth literature review along with comparison with proposed antenna is performed to show its potential for targeted applications. The utilization of FR4 as a substrate of the antenna along with its compact size of 15 mm × 20 mm while having multiband and multi-mode frequency reconfigurability makes it a strong candidate for present as well as for future smart devices and electronics. Full article
(This article belongs to the Special Issue Microwave Passive Components, 3rd Edition)
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13 pages, 4379 KiB  
Article
A Broadband Millimeter-Wave Circularly Polarized Folded Reflectarray Antenna Based on Transmissive Linear-to-Circular Polarization Converter
by Yue Cao, Zhuwei Wang, Qing Wang, Mingzhu Du and Miaojuan Zhang
Micromachines 2025, 16(6), 711; https://doi.org/10.3390/mi16060711 - 14 Jun 2025
Viewed by 455
Abstract
In this paper, a wideband circularly polarized folded reflectarray antenna (CPFRA) based on a transmissive linear-to-circular polarization converter is proposed. The CPFRA consists of a primary reflector and a sub-reflector. To achieve broadband performance, a metasurface-based RA element on the primary reflector surface [...] Read more.
In this paper, a wideband circularly polarized folded reflectarray antenna (CPFRA) based on a transmissive linear-to-circular polarization converter is proposed. The CPFRA consists of a primary reflector and a sub-reflector. To achieve broadband performance, a metasurface-based RA element on the primary reflector surface and a transmissive linear-to-circular polarization converter on the sub-reflector surface are applied. Moreover, the transmissive linear-to-circular polarization converter on the sub-reflector surface helps convert linear polarization to circular polarization. To verify the proposed CPFRA, a prototype is designed, fabricated, and tested. The measured results exhibit that the proposed CPFRA presents a 3 dB gain bandwidth of 27.4% and a 3 dB axial ratio bandwidth of 23%. The CPFRA achieves a peak gain of 21.2 dBi with an aperture efficiency of 27.2%. The proposed CPFRA is a promising candidate for millimeter-wave (mm-W) satellite communication applications because of its advantages of high gain, low cost, low profile, and broad bandwidth. Full article
(This article belongs to the Special Issue Microwave Passive Components, 3rd Edition)
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10 pages, 1404 KiB  
Communication
Synthesis and Design of a Miniaturized Broadband Bandstop Filter with a Simple Structure
by Chuan Shao, Rong Cai, Xinnai Zhang and Kai Xu
Micromachines 2025, 16(6), 607; https://doi.org/10.3390/mi16060607 - 23 May 2025
Viewed by 352
Abstract
In this paper, a miniaturized broadband bandstop filter with a simple structure is proposed, synthesized, and developed. The proposed broadband bandstop filter is designed using asymmetrically loaded parallel-coupled microstrip lines, resulting in five transmission zeros within the stopband. Closed-form formulas of the entire [...] Read more.
In this paper, a miniaturized broadband bandstop filter with a simple structure is proposed, synthesized, and developed. The proposed broadband bandstop filter is designed using asymmetrically loaded parallel-coupled microstrip lines, resulting in five transmission zeros within the stopband. Closed-form formulas of the entire set of generated transmission zeros are derived to guide a practical design procedure. To demonstrate the effectiveness of the proposed concept and synthesis method, a miniaturized broadband bandstop filter centered at 3 GHz with a 20 dB rejection bandwidth of about 100% is designed, fabricated, and measured. The core circuit size of the developed broadband bandstop filter is only 0.5 λg × 0.1 λg (31.2 mm × 6.5 mm). Full article
(This article belongs to the Special Issue Microwave Passive Components, 3rd Edition)
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