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Micromachines
Special Issues
Novel Electromagnetic and Acoustic Devices
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Novel Electromagnetic and Acoustic Devices

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

Deadline for manuscript submissions: 30 November 2025 | Viewed by 6862

Special Issue Editors

Dr. Bin Zheng

E-Mail Website
Guest Editor
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
Interests: metamaterials and metasurfaces; invisibility cloaks; transformation optics; acoustic devices
Special Issues, Collections and Topics in MDPI journals
Dr. Rui Xi

E-Mail Website
Guest Editor Assistant
Hangzhou Institute of Technology, Xidian University, Hangzhou 311200, China
Interests: electromagnetic metasurface; high gain antenna; frequency selective surface; deep learning; topological insulator

Special Issue Information

Dear Colleagues,

Electromagnetic and acoustic devices with higher-order flexibility are continually promising and urgently required for energy transmission manipulation. With the rapid development of material innovations and performance advancements, more sophisticated electromagnetic and acoustic devices with novel characteristics have attracted broad research attention due to their profound applications in radar communications, broadcasting, and telecommunications. Great efforts have been made in electromagnetic wave transmission, reflection, absorption, shielding, and invisible cloaking for electromagnetic devices. Multiple scenes with severe circumstances have encouraged the promotion of acoustic devices with outstanding tunable functions. Based on physical field theory, various synthesis mechanism have led to the multifunctional field effects of novel electromagnetic and acoustic devices. This Special Issue aims to give an outlook on what the future might hold for novel electromagnetic and acoustic devices.

It is our great pleasure to invite you to submit a manuscript to this Special Issue. Full papers, communications, and reviews are all welcomed on themes including, but not limited to, the following:

  • Novel electromagnetic/acoustic devices;
  • Reconfigurable or intelligent electromagnetic/acoustic devices;
  • Transformation optics and invisibility cloaks;
  • Absorbers and frequency selective surfaces;
  • Topological insulators;
  • Multifunctional metadevices.

Dr. Bin Zheng
Guest Editor

Dr. Rui Xi
Guest Editor Assistant

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

  • metamaterials
  • metasurfaces
  • acoustics topological insulators
  • reconfigurable
  • multifunction

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Further information on MDPI's Special Issue policies can be found here.

Published Papers (5 papers)

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Research

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11 pages, 2425 KB  
Article
Single-Layer High-Efficiency Metasurface for Multi-User Signal Enhancement
by Hui Jin, Peixuan Zhu, Rongrong Zhu, Bo Yang, Siqi Zhang and Huan Lu
Micromachines 2025, 16(8), 911; https://doi.org/10.3390/mi16080911 - 6 Aug 2025
Viewed by 640
Abstract
In multi-user wireless communication scenarios, signal degradation caused by channel fading and co-channel interference restricts system capacity, while traditional enhancement schemes face challenges of high coordination complexity and hardware integration. This paper proposes an electromagnetic focusing method using a single-layer transmissive passive metasurface. [...] Read more.
In multi-user wireless communication scenarios, signal degradation caused by channel fading and co-channel interference restricts system capacity, while traditional enhancement schemes face challenges of high coordination complexity and hardware integration. This paper proposes an electromagnetic focusing method using a single-layer transmissive passive metasurface. A high-efficiency metasurface array is fabricated based on PCB technology, which utilizes subwavelength units for wide-range phase modulation to construct a multi-user energy convergence model in the WiFi band. By optimizing phase gradients through the geometric phase principle, the metasurface achieves collaborative wavefront manipulation for multiple target regions with high transmission efficiency, reducing system complexity compared to traditional multi-layer structures. Measurements in a microwave anechoic chamber and tests in an office environment demonstrate that the metasurface can simultaneously create signal enhancement zones for multiple users, featuring stable focusing capability and environmental adaptability. This lightweight design facilitates deployment in dense networks, providing an effective solution for signal optimization in indoor distributed systems and IoT communications. Full article
(This article belongs to the Special Issue Novel Electromagnetic and Acoustic Devices)
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14 pages, 4288 KB  
Article
The Impact of Acoustic Synthetic Jet Actuator Parameters on the Generated Noise
by Emil Smyk and Michał Stopel
Micromachines 2025, 16(7), 803; https://doi.org/10.3390/mi16070803 - 10 Jul 2025
Viewed by 543
Abstract
Synthetic jet actuators are becoming increasingly popular for enhancing electronic heat transfer. However, their use is currently limited due to the high noise they generate. This article examines how actuator parameters (orifice diameter, orifice length and cavity height) affect synthetic jet velocity and [...] Read more.
Synthetic jet actuators are becoming increasingly popular for enhancing electronic heat transfer. However, their use is currently limited due to the high noise they generate. This article examines how actuator parameters (orifice diameter, orifice length and cavity height) affect synthetic jet velocity and noise generation. Hot-wire anemometry was used to measure velocity, and noise was measured with a sound meter. The actuator was supplied with constant power at different frequencies ranging from 50 to 500 Hz. Observation of the velocity showed that it decreased with an increasing orifice diameter and increased with a decreasing orifice length. No relationship was observed between cavity height and synthetic jet velocity. This article indicates that increasing the orifice diameter or reducing the orifice length causes an increase in the noise generated by SJAs, provided we remain in the vicinity of the characteristic frequency. It was demonstrated that higher actuator chambers produce higher noise levels, although this was not a consistent trend across the entire tested frequency range. Full article
(This article belongs to the Special Issue Novel Electromagnetic and Acoustic Devices)
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10 pages, 2060 KB  
Article
Passive Frequency Tunability in Moiré-Inspired Frequency Selective Surfaces Based on Full-Wave Simulation
by Jieun Hwang and Sungcheol Hong
Micromachines 2025, 16(6), 702; https://doi.org/10.3390/mi16060702 - 12 Jun 2025
Viewed by 3065
Abstract
This paper presents a simulation-based investigation of passive frequency tunability in frequency-selective surfaces (FSSs) enabled by Moiré pattern interference. By overlapping two identical hexagonal FSS layers and introducing rotational misalignment between them, we demonstrate that the resulting Moiré patterns induce significant shifts in [...] Read more.
This paper presents a simulation-based investigation of passive frequency tunability in frequency-selective surfaces (FSSs) enabled by Moiré pattern interference. By overlapping two identical hexagonal FSS layers and introducing rotational misalignment between them, we demonstrate that the resulting Moiré patterns induce significant shifts in the resonance frequency without any external bias or active components. Using full-wave simulations in HFSS, we show that rotating the second layer from 0° to 30° can shift the resonant frequency from 4.4 GHz down to 1.2 GHz. This tunable behavior emerges solely from geometrical manipulation, offering a low-complexity alternative to active tuning methods that rely on varactors or micro-electromechanical systems (MEMSs). We discuss the theoretical basis for this tuning mechanism based on effective periodicity modulation via rotational interference and highlight potential applications in passive reconfigurable filters and refractive index sensors. The proposed approach provides a promising route for implementing tunable electromagnetic structures without compromising simplicity, power efficiency, or integration compatibility. Full article
(This article belongs to the Special Issue Novel Electromagnetic and Acoustic Devices)
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9 pages, 9851 KB  
Article
Manipulation of Topological Edge States and Realization of Zero-Dimensional Higher-Order Topological Point States
by Jiahui Ren, Wenjing Ding, Sihan Wang and Shiwei Tang
Micromachines 2025, 16(6), 686; https://doi.org/10.3390/mi16060686 - 7 Jun 2025
Viewed by 787
Abstract
Topological photonics has provided revolutionary ideas for the design of next-generation photonic devices due to its unique light transmission properties. This paper proposes a honeycomb photonic crystal structure based on a mirror-symmetric interface and numerically simulates the precise manipulation of topological edge states [...] Read more.
Topological photonics has provided revolutionary ideas for the design of next-generation photonic devices due to its unique light transmission properties. This paper proposes a honeycomb photonic crystal structure based on a mirror-symmetric interface and numerically simulates the precise manipulation of topological edge states and the robust excitation of high-order topological corner states in this structure. Specifically, two honeycomb photonic crystals with non-trivial topological properties form an interface through mirror-symmetric stitching. Continuous adjustment of the spacing between their coupling pillars can induce the closure and reopening of topological edge state energy bands, accompanied by significant band inversion, revealing the dynamic process of topological phase transitions. Furthermore, zero-dimensional high-order topological corner states are observed at the junction of boundaries with different topological properties. Their localized field strengths are strictly confined and exhibit strong robustness against structural defects. This study not only provides a new mechanism for the local symmetry manipulation of topological edge states but also lays a foundation for the design of high-order topological photonic crystals and the practical application of topological photonic devices. Full article
(This article belongs to the Special Issue Novel Electromagnetic and Acoustic Devices)
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Review

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20 pages, 2666 KB  
Review
Development of Energy-Selective Surface for Electromagnetic Protection
by Jinghao Lv, Caofei Luo, Jiwei Zhao, Haoran Han, Huan Lu and Bin Zheng
Micromachines 2025, 16(5), 555; https://doi.org/10.3390/mi16050555 - 1 May 2025
Cited by 2 | Viewed by 1252
Abstract
Energy-selective surfaces (ESSs) have gained attention as an advanced electromagnetic protection technology. This review discusses the evolution of ESSs, focusing on four key areas: frequency bandwidth expansion, material innovations, functional enhancements, and application diversification. ESSs have evolved from narrowband designs to providing ultra-wideband [...] Read more.
Energy-selective surfaces (ESSs) have gained attention as an advanced electromagnetic protection technology. This review discusses the evolution of ESSs, focusing on four key areas: frequency bandwidth expansion, material innovations, functional enhancements, and application diversification. ESSs have evolved from narrowband designs to providing ultra-wideband protection, covering L-band to K-band frequencies. New designs, including non-reciprocal mechanisms and cascaded filters, enhance the shielding efficiency. Material advancements like the use of vanadium dioxide (VO2) and micro–nano fabrication techniques have reduced costs and improved performance, enabling higher-frequency applications. Future developments aim to overcome the current limitations, offering a broader bandwidth, higher power tolerance, and faster response times. ESSs play a key role in integrated electromagnetic protection systems. Full article
(This article belongs to the Special Issue Novel Electromagnetic and Acoustic Devices)
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