Article
Engineering, Electrical & Electronic
Xueyong Wei, Liu Xu, Zhuangde Jiang, Ronghua Huan
Summary: A novel frequency multiplication mechanism utilizing superharmonic synchronization (SHS) effect in micromechanical resonator is proposed, achieving high-rate frequency amplification, improved output signal stability, and increased signal to noise ratio. Additionally, a frequency automatic tracking system is designed to expand the working range and solve the limitation of narrow synchronization range.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Analytical
Alexey Tkachenko, Igor Lysenko, Andrey Kovalev
Summary: In this article, the stages of designing high-performance radio-frequency single-pole single-throw microelectromechanical switches for mobile communication devices and 5G mobile networks are investigated. The manufactured experimental samples demonstrate low insertion loss, high linearity, and small contact resistance in the closed state.
Article
Metallurgy & Metallurgical Engineering
Zhang Ying-cong, Ge Jin-qun, Wang Guo-an
Summary: This paper discusses the needs and implementation methods of multi-function, multiband, cost-effective, miniaturized reconfigurable RF components in modern and future wireless communication systems. It focuses on the development of RF microelectromechanical systems and other tunable components using microfabrication techniques and advanced materials. The research on the application of ferroelectric and ferromagnetic materials to achieve continuous tunability, reduced size, and enhanced performance of RF components is also presented. Additionally, methods utilizing nano-patterning to improve the high frequency characteristics of ferromagnetic thin film and their applications in developing fully electrically tunable RF components are fully demonstrated.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Engineering, Mechanical
Zeji Chen, Tianyun Wang, Qianqian Jia, Jinling Yang, Quan Yuan, Yinfang Zhu, Fuhua Yang
Summary: This work introduces a high-performance Lame mode resonator with optimized design to decrease anchor loss and thermoelastic damping, and developed a simple and reliable process for batch fabrication. Impressive performance was achieved in both air and vacuum, and nonlinearities were observed experimentally, providing useful guidance for stable operation.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Multidisciplinary Sciences
Utku Emre Ali, Gaurav Modi, Ritesh Agarwal, Harish Bhaskaran
Summary: Phase-change materials have the ability to permanently and reversibly switch between amorphous and crystalline states. In this study, nanowires were used as active nanoelectromechanical systems to overcome limitations in suspended thin-film configurations. By exploiting a dislocation-based route for amorphization, the researchers achieved active modulation of Young's modulus in GeTe nanowires. These nanowires enabled power-free tuning of resonance frequency and demonstrated real-time frequency tuning in a frequency-hopping spread spectrum radio prototype.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
H. Dahmani, N. Smagin, P. Campistron, J. Carlier, M. Toubal, B. Nongaillard
Summary: This Letter reports the fabrication and characterization of a silicon micro-machined cavity designed for micro-resolution Ultra-High Frequency imaging in microfluidics and microbiological applications using one-channel time reversal. The wideband zinc oxide micro transducers coupled with the silicon wafer enable acoustical field confinement, and the diffused acoustic field and time-reversal retro-focusing were characterized. The transducers have a frequency range of 0.2-2 GHz with a central frequency of 0.9 GHz.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Matthew Giorgis Anderson, Arno Thielens, Stijn Wielandt, Ali M. Niknejad, Jan M. Rabaey
Summary: This paper presents a method for low-power RF beamforming utilizing transmission-line transformers and balanced impedance phase shifters. The method offers advantages of low loss, simplicity, and scalability, and extends the beam-steering range through the introduction of a crossover switch.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Chemistry, Analytical
Flavio Giacomozzi, Emanuela Proietti, Giovanni Capoccia, Giovanni Maria Sardi, Giancarlo Bartolucci, Jacopo Iannacci, Girolamo Tagliapietra, Benno Margesin, Romolo Marcelli
Summary: This paper discusses the design approach for U-shaped structures combined with RF MEMS switches for small-footprint tunable resonators. The devices were evaluated for K-Band operation and the ON-OFF states of the switches allow for selecting different frequencies. Initial configurations were designed and manufactured as a proof-of-concept and the advantages and critical aspects are discussed.
Article
Chemistry, Analytical
David Torres, LaVern Starman, Harris Hall, Juan Pastrana, Sarah Dooley
Summary: This paper presents a novel MEMS micromirror device capable of achieving large motion for both tip/tilt angles and piston motion. The device utilizes an electrothermal actuation assembly fabricated from carefully patterned thin-film stack, enabling large-angle beamsteering. The measured performance metrics include tip/tilt angles of +/- 23 degrees, piston motion of 127 mu m, and resonant frequencies at around 145 Hz and 226 Hz for tip/tilt and piston motion, respectively.
Article
Optics
Huan Guan, Feifei Ren, Shuhui Liang, Jinxin Gu, Chenchen Geng, Hang Wei, Shuliang Dou, Jiupeng Zhao, Yao Li
Summary: This study demonstrates that combining the insulator-to-metal transition of vanadium dioxide (VO2) with anti-reflection layers enables high and broadband open-state transmittance, while maintaining a large turndown ratio. Optothermal simulation shows that the transition of VO2 OL occurs at 0.23 μs under ultrafast laser irradiation with an intensity of 90 kW cm(-2). These findings provide a promising alternative to optical limiters in various technologies, from sensor protection to human eye defense.
LASER & PHOTONICS REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
Seonhyoung Kim, Hong Goo Yeo, Jungho Ryu, Hongsoo Choi
Summary: This paper investigates the design of circular pMUTs with different clamped membranes to enhance the acoustic intensity. The displacement and mode shape of the membranes were controlled by etched holes to improve the vibrational characteristics. Experimental and simulation results showed the effectiveness of the geometric design in enhancing acoustic intensity and effective area.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Jie Zhang, Hao Gao, Zhuoze Zhao, Jiahui Cheng, Baodong Zhao, Bin Luo, Song Yu
Summary: Synchronous radio frequency signals are widely used in various applications and the stability of frequency synchronization is affected by phase fluctuations induced by the transmission medium. We propose a stable RF transmission solution using coaxial cable as the medium, where the phase fluctuations caused by the cable can be detected and compensated in real-time.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Naci Pekcokguler, Dominique Morche, Andreas Burg, Catherine Dehollain
Summary: A low power receiver architecture is proposed to monitor the 2.4 GHz ISM band for communication standards such as WLAN, ZigBee, and BLE. The architecture includes a widely tunable Gm-C CBPF, achieving a frequency shift of +/- 60MHz and a bandwidth range of 5-40MHz. The power consumption ranges from 6.7 mu W to 99.2 mu W.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Chemistry, Analytical
Yong Zhu, Jitendra Pal
Summary: This paper presents a novel laterally actuated RF MEMS switch utilizing both electrothermal actuation and electrostatic latching hold mechanisms, achieving superior RF performance and high reliability. The switch features a 7 μm initial switch gap, an electrothermal actuation voltage of 7 V, and an electrostatic holding voltage of 21 V, with measured insertion loss of -0.73 dB and isolation of -46 dB at 6 GHz. Additionally, the switch demonstrates high reliability and power handling capability, capable of operating up to 10 million cycles without failure with 1 W power applied to its signal line.
Article
Computer Science, Information Systems
Jaswinder Lota, Andreas Demosthenous
Summary: Ultra-high-speed data communication receivers conventionally require high-sampling-rate analog digital converters (ADCs) with design challenges in terms of resolution and power. However, this paper proposes a paradigm approach that circumvents the use of power-hungry ADCs by employing low-power analog processing. Through simulations using Matlab, a low-power analog Rx with direct-demodulation and RF correlation is able to support multiple modulations, including 16-QAM. Power analysis shows considerable power savings compared to other approaches requiring ADCs. This novel approach offers a low-power integrated design solution for ultra-high-speed communication.