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Micromachines
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Recent Advances in Electromagnetic Devices, 2nd Edition
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Recent Advances in Electromagnetic Devices, 2nd Edition

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

Deadline for manuscript submissions: 15 October 2026 | Viewed by 3711

Special Issue Editor

Prof. Dr. Haejun Chung

E-Mail Website
Guest Editor
1. Department of Electronic Engineering, Hanyang University, Seoul 04763, Republic of Korea
2. Department of Artificial Intelligence, Hanyang University, Seoul 04763, Republic of Korea
Interests: electromagnetics; metamaterials; antenna; optics; photonics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues, 

This Special Issue, titled “Recent Advances in Electromagnetic Devices, 2nd Edition”, will explore the latest developments in the field of electromagnetic technology, focusing on innovations in design, materials, and applications. Central themes of this Special Issue include the optimization of device efficiency, miniaturization, and integration with other technologies. Key advancements within this field will be highlighted, such as the following:

  • Metamaterials, which enable novel properties and functions not found in natural materials, leading to breakthroughs in antenna design, cloaking, and electromagnetic shielding;
  • The momentum gained by wireless power transfer, allowing for efficient energy transmission over short and long distances with applications in consumer electronics and electric vehicles;
  • Electromagnetic actuators and sensors, which have the potential to improve robotic systems, medical devices, and aerospace engineering;
  • Aspects of optical devices and photonic devices such as lenses, mirrors, microscopes, fiber optics, imaging, sensing, lasers, solar energy harvesting, photodetectors, and biomedical research.

Prof. Dr. Haejun Chung
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 250 words) can be sent to the Editorial Office for assessment.

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
  • antenna
  • wireless power transfer
  • electromagnetic sensors
  • electromagnetic shielding
  • electromagnetic simulation
  • biomedical applications
  • terahertz technology
  • tunable metamaterials
  • beam forming, beam steering
  • optics
  • photonics
  • microwave

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Related Special Issue

Published Papers (4 papers)

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Research

14 pages, 5301 KB  
Article
Reinforcement Learning-Based Optimization of Ku-Band Low-Noise Amplifier
by Jiyong Chung, Hoyeon Shin, Seonho Shin, Yeonggi Kim, Saeed Zeinolabedinzadeh, Dongjin Ji and Ickhyun Song
Micromachines 2026, 17(5), 554; https://doi.org/10.3390/mi17050554 - 30 Apr 2026
Viewed by 267
Abstract
In this paper, we present a study on the automated design optimization of a wideband low-noise amplifier (LNA) operating in Ku-band (12 to 18 GHz) using proximal policy optimization (PPO), one of the widely applied reinforcement learning (RL) algorithms for engineering problems. As [...] Read more.
In this paper, we present a study on the automated design optimization of a wideband low-noise amplifier (LNA) operating in Ku-band (12 to 18 GHz) using proximal policy optimization (PPO), one of the widely applied reinforcement learning (RL) algorithms for engineering problems. As a target microwave active circuit, we select a two-stage LNA architecture, where transmission lines (TLs) are dominantly used for impedance matching and gain/noise optimization. For simplicity, all widths of TLs were fixed so that the characteristic impedance is 50 Ω, with lengths of TLs being set as design parameters. In addition, dimension variables of capacitors were treated as design parameters and, in total, we optimized 29 parameters. For target specifications, we set both S11 and S22 to be below −10 dB over the 12–18 GHz band and the noise figure (NF) to be below 2 dB. A total of 20,140 simulations were performed for training and the overall process took about 24 h. The results show that both the reward and the loss converged appropriately, achieving the target specifications successfully. For the final results, we performed up to 25 predictions, and the prediction process was terminated early if a solution meeting all target specifications was found within the given number of attempts. The device model used was a commercial 150 nm GaN high-electron-mobility transistor (HEMT) process technology. Full article
(This article belongs to the Special Issue Recent Advances in Electromagnetic Devices, 2nd Edition)
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16 pages, 24814 KB  
Article
Inverse Design of Thermal Imaging Metalens Achieving 100° Field of View on a 4 × 4 Microbolometer Array
by Munseong Bae, Eunbi Jang, Chanik Kang and Haejun Chung
Micromachines 2026, 17(1), 65; https://doi.org/10.3390/mi17010065 - 31 Dec 2025
Cited by 1 | Viewed by 1499
Abstract
We present an inverse designed metalens for long-wave infrared (LWIR) imaging tailored to consumer and Internet of Things (IoT) platforms. Conventional LWIR optics either rely on costly specialty materials or suffer from low efficiency and narrow fields of view (FoV), limiting scalability. Our [...] Read more.
We present an inverse designed metalens for long-wave infrared (LWIR) imaging tailored to consumer and Internet of Things (IoT) platforms. Conventional LWIR optics either rely on costly specialty materials or suffer from low efficiency and narrow fields of view (FoV), limiting scalability. Our approach integrates adjoint-based inverse design with fabrication-aware constraints and a cone-shaped source model that efficiently captures oblique incidence during optimization. The resulting multi-level metalens achieves a wide FoV up to 100° while maintaining robust focusing efficiency and stable angle-to-position mapping on low-power 4×4 microbolometer arrays representative of edge devices. We further demonstrate application-level imaging on 4×4 microbolometer arrays, showing that the proposed metalens delivers a substantially wider FoV than a commercial narrow FoV lens while meeting low-resolution, low-cost, and low-power constraints for edge LWIR modules. By eliminating bulky multi-element stacks and reducing cost and form factor, the proposed design provides a practical pathway to compact, energy-efficient LWIR modules for consumer applications such as occupancy analytics, smart-building automation, mobile sensing, and outdoor fire surveillance. Full article
(This article belongs to the Special Issue Recent Advances in Electromagnetic Devices, 2nd Edition)
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Graphical abstract

19 pages, 11278 KB  
Article
Design and Experimental Validation of a Round Inductosyn-Based Angular Measurement System
by Jian Wang, Jianyuan Wang, Jinbao Chen, Chukang Zhong and Yuankui Shao
Micromachines 2026, 17(1), 5; https://doi.org/10.3390/mi17010005 - 20 Dec 2025
Viewed by 604
Abstract
This paper presents the design, implementation, and experimental validation of a high-precision angular measurement system based on a round inductosyn. Dedicated hardware circuits, including excitation, signal conditioning, and resolver-to-digital conversion modules, together with software algorithms for coarse–fine data fusion and linear interpolation-based error [...] Read more.
This paper presents the design, implementation, and experimental validation of a high-precision angular measurement system based on a round inductosyn. Dedicated hardware circuits, including excitation, signal conditioning, and resolver-to-digital conversion modules, together with software algorithms for coarse–fine data fusion and linear interpolation-based error compensation, are developed to achieve accurate and stable angular measurement. Experimental results obtained from repeated measurements over a full rotation demonstrate reliable system operation and effective suppression of nonlinear errors. After compensation, the residual angular error is limited to within ±3″, while measurement consistency across repeated experiments is significantly improved. The output angle exhibits good continuity and stability, confirming the feasibility and effectiveness of the proposed system for high-precision servo control and aerospace attitude measurement applications. Full article
(This article belongs to the Special Issue Recent Advances in Electromagnetic Devices, 2nd Edition)
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14 pages, 3541 KB  
Article
A Solar Cell Compatible Super-Wideband Flexible Transparent Antenna with Enhanced Axial Ratio
by Nouman Rasool, Shuqi Yang, Chen Chen, Zhengming Tang, Kama Huang and Jinwei Gao
Micromachines 2025, 16(11), 1291; https://doi.org/10.3390/mi16111291 - 18 Nov 2025
Viewed by 652
Abstract
A super-wideband transparent antenna (SWTA) with wide axial ratio bandwidth (ARBW) featuring an enhanced ground plane and microstrip feeding is proposed. The antenna has planar dimensions of 0.20λ0 × 0.20λ0 × 0.003λ0 at its lowest frequency of [...] Read more.
A super-wideband transparent antenna (SWTA) with wide axial ratio bandwidth (ARBW) featuring an enhanced ground plane and microstrip feeding is proposed. The antenna has planar dimensions of 0.20λ0 × 0.20λ0 × 0.003λ0 at its lowest frequency of 1.33 GHz. The antenna is fabricated from a combination of PET and metal oxide thin films, which together enable its flexibility and transparency. The L-shaped strips attached to the ground perturb the electric field in the slot, exciting a pair of orthogonal modes and resulting in circular polarization. The proposed antenna demonstrate high performance with an impedance bandwidth of 182% (1.33–28.52 GHz), an axial ratio bandwidth of 66% (3.88–7.73 GHz), and attain a peak gain of 11.5 dBi. Moreover, with an optical transparency exceeding 90%, this design is a flexible, transparent, super-wideband (SWB) antenna capable of high data rates, easy integration, and beyond-visual-line-of-sight (BVLOS) operations. Full article
(This article belongs to the Special Issue Recent Advances in Electromagnetic Devices, 2nd Edition)
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