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Micromachines
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RF Devices: Technology and Progress
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RF Devices: Technology and Progress

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

Deadline for manuscript submissions: 30 September 2025 | Viewed by 5003

Special Issue Editor

Dr. Lifeng Wang

E-Mail Website
Guest Editor
Key Laboratory of MEMS of the Ministry of Education, School of Electronic Science & Engineering, Southeast University, Nanjing 210096, China
Interests: micro sensors; wireless passive sensor systems; RF MEMS
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

RF MEMS is a type of MEMS device that processes radio frequency signals. RF MEMS can utilize MEMS technology to manufacture on-chip transmission lines, RF cavities, three-dimensional inductors, couplers, varactors, switches, filters, phase shifters and antennas. Compared with traditional RF devices, RF MEMS devices have many advantages, including their small size, insensitivity to acceleration, low DC power consumption, and ability to be fabricated on low-cost silicon or glass substrates. In addition, RF MEMS devices can be integrated with traditional silicon-based and gallium arsenide-based circuits, enabling miniaturization of RF processing systems. These advantages have led to significant applications in fields such as mobile communications, satellites, radars, etc. Accordingly, this Special Issue seeks to showcase research papers, short communications, and review articles that focus on novel technology and progress in RF MEMS and its use for various RF systems.

Dr. Lifeng Wang
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 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

  • RF MEMS
  • switch
  • filters
  • ase shifters
  • varactors
  • inductors
  • antenna
  • reconfigurable
  • tuneable

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Published Papers (3 papers)

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Research

11 pages, 5969 KiB  
Article
W-Band Low-Noise Amplifier with Improved Stability Using Dual RC Traps in Bias Networks on a 0.1 μm GaAs pHEMT Process
by Seong-Hee Han and Dong-Wook Kim
Micromachines 2025, 16(2), 219; https://doi.org/10.3390/mi16020219 - 15 Feb 2025
Viewed by 443
Abstract
This paper demonstrates that potential oscillations in various frequency bands of monolithic microwave integrated circuits (MMICs) can be effectively suppressed using well-designed dual RC traps in the bias networks. The proposed approach is applied to the design and development of a highly stable [...] Read more.
This paper demonstrates that potential oscillations in various frequency bands of monolithic microwave integrated circuits (MMICs) can be effectively suppressed using well-designed dual RC traps in the bias networks. The proposed approach is applied to the design and development of a highly stable W-band low-noise amplifier (LNA) MMIC for high-precision millimeter-wave applications. The amplifier is fabricated using the 0.1 µm GaAs pHEMT process from Win Semiconductors. The cascaded four-stage design consists of two low-noise-optimized stages, followed by two high-gain-tuned stages. Stability is enhanced through the integration of dual RC traps in the bias networks, which is rigorously evaluated using stability factors (K and μ) and network determinant function (NDF) encirclement analysis. In low-noise mode, the developed low-noise amplifier MMIC achieves a noise figure of 5.6−6.2 dB and a linear gain of 17.8−19.8 dB over the 90−98 GHz frequency range, while only consuming a DC power of 96 mW. In high-gain mode, it has a noise figure of 6.2−6.9 dB and a linear gain of 19.8−21.7 dB. Full article
(This article belongs to the Special Issue RF Devices: Technology and Progress)
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12 pages, 2891 KiB  
Article
Dual-Band Multi-Layer Antenna Array with Circular Polarization and Gain Enhancement for WLAN and X-Band Applications
by Bal S. Virdee, Tohid Aribi and Tohid Sedghi
Micromachines 2025, 16(2), 203; https://doi.org/10.3390/mi16020203 - 10 Feb 2025
Viewed by 638
Abstract
This paper presents a novel multi-layer, dual-band antenna array designed for WLAN and X-band applications, incorporating several innovative features. The design employs a pentagon-shaped radiating element with parasitic strips to enable dual-band operation. A dual-transformed feed network with chamfered feed strip corners minimizes [...] Read more.
This paper presents a novel multi-layer, dual-band antenna array designed for WLAN and X-band applications, incorporating several innovative features. The design employs a pentagon-shaped radiating element with parasitic strips to enable dual-band operation. A dual-transformed feed network with chamfered feed strip corners minimizes radiation distortion and cross-polarization while introducing orthogonal phase shifts to achieve circular polarization (CP) at the X-band. A Fabry–Pérot structure, strategically placed above the array, enhances gain in the WLAN band. The antenna demonstrates an impedance bandwidth of 1.8 GHz (S11 < −10 dB) at the WLAN band, with 36% fractional bandwidth, and 4.3 GHz at the X-band, with 43% fractional bandwidth. Measured peak gains are 7 dBi for the WLAN band and 6.8 dBi for the X-band, with favourable S11 levels, omni-directional radiation patterns, and consistent gain across both bands. Circular polarization is achieved within 8.5–10.4 GHz. Experimental results confirm the array’s significant advancements in multi-band performance, making it highly suitable for diverse wireless communication applications. Full article
(This article belongs to the Special Issue RF Devices: Technology and Progress)
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11 pages, 6036 KiB  
Article
A Compact Wideband Vivaldi Antenna for Non-Invasive Glucose Monitoring
by Shasha Yang, Yu Wang, Shiwen Gao, Yi Zhuang, Lifeng Wang, Zhenxiang Yi and Weixun Zhang
Micromachines 2024, 15(11), 1389; https://doi.org/10.3390/mi15111389 - 16 Nov 2024
Viewed by 2261
Abstract
Due to the high gain, wide bandwidth, and directional radiation characteristics of Vivaldi antennas, this paper conducted relevant research on the feasibility of non-destructive blood glucose detection based on Vivaldi antennas. The research included finite element method (FEM) simulation and glucose concentration monitoring. [...] Read more.
Due to the high gain, wide bandwidth, and directional radiation characteristics of Vivaldi antennas, this paper conducted relevant research on the feasibility of non-destructive blood glucose detection based on Vivaldi antennas. The research included finite element method (FEM) simulation and glucose concentration monitoring. In the simulation stage, the power transmission and reflection characteristics, radiation characteristics, and electric field distribution characteristics of the antenna were described in detail. In the test stage, the S11 response of the antenna to variation in glucose concentration in the range of 0–6.11 mg/mL was measured, including the S11 amplitude and phase. The experimental results show that there is a high linear correlation between the S11 response and glucose concentration, and the sensitivity of the S11 amplitude response to the variation in glucose concentration is close to 0.3445 (dB/(mg/mL)) at 14.2556 GHz, and the sensitivity of the S11 phase response to the variation in glucose concentration is about 0.5652 (degree/(mg/mL)) at 14.37 GHz. In addition, the predicted results of the glucose concentration based on linear regression are discussed. Full article
(This article belongs to the Special Issue RF Devices: Technology and Progress)
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