Micromachines最新文献_第5页

Variational Bayesian Innovation Saturation Kalman Filter for Micro-Electro-Mechanical System-Inertial Navigation System/Polarization Compass Integrated Navigation. 微机电系统-惯导系统/极化罗经组合导航的变分贝叶斯创新饱和卡尔曼滤波。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-10 DOI: 10.3390/mi16091036

Yu Sun, Xiaojie Liu, Xiaochen Liu, Huijun Zhao, Chenguang Wang, Huiliang Cao, Chong Shen

{"title":"Variational Bayesian Innovation Saturation Kalman Filter for Micro-Electro-Mechanical System-Inertial Navigation System/Polarization Compass Integrated Navigation.","authors":"Yu Sun, Xiaojie Liu, Xiaochen Liu, Huijun Zhao, Chenguang Wang, Huiliang Cao, Chong Shen","doi":"10.3390/mi16091036","DOIUrl":"10.3390/mi16091036","url":null,"abstract":"Aiming at the issue of time-varying measurement noise with heavy-tailed characteristics and outliers generated by the polarization compass (PC) in the micro-electro-mechanical system-inertial navigation system (MEMS-INS) and PC-integrated navigation system when it is subject to internal and external disturbances, an improved Variational Bayesian Innovation Saturation Robust Adaptive Kalman filter (VISKF) algorithm is proposed. This algorithm utilizes the variational Bayesian (VB) method based on Student's t-distribution (STD) to approximately calculate the statistical characteristics of the time-varying measurement noise of the PC, thereby obtaining more accurate measurement noise statistical parameters. Additionally, the algorithm introduces an innovation saturation function and proposes an adaptive update strategy for the saturation boundary. It mitigates the problem of innovation value divergence in PC caused by outliers through a two-layer structure that can track the changes in the innovation value to adaptively adjust the saturation boundary. To verify the effectiveness of the algorithm, static and dynamic experiments were conducted on an unmanned vehicle. The experimental results show that compared with adaptive Kalman filter (AKF), variational Bayesian robust adaptive Kalman filter (VBRAKF), and innovation saturate robust adaptive Kalman filter (ISRAKF), the proposed algorithm improves the dynamic orientation accuracy by 76.89%, 67.23%, and 84.45%, respectively. Moreover, compared with other similar target algorithms, the proposed algorithm also has obvious advantages. Therefore, this method can significantly improve the navigation accuracy and robustness of the INS/PC integrated navigation system in complex environments.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 9","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12472092/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of N-Way Power Divider Based on TE₁₀ Mode Splitting Strategy. 基于TE10模式分裂策略的n路功率分配器设计。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-10 DOI: 10.3390/mi16091033

Jianfeng Chen, Haidi Tang, Shengqi Zhang, Leijun Xu

引用次数: 0

Lightweight Design Method for Micromanufacturing Systems Based on Multi-Objective Optimization. 基于多目标优化的微制造系统轻量化设计方法。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-09 DOI: 10.3390/mi16091032

Shan Li, Seyed Hamed Hashemi Sohi

{"title":"Lightweight Design Method for Micromanufacturing Systems Based on Multi-Objective Optimization.","authors":"Shan Li, Seyed Hamed Hashemi Sohi","doi":"10.3390/mi16091032","DOIUrl":"10.3390/mi16091032","url":null,"abstract":"This study proposes a multi-stage collaborative design framework integrating sensitivity analysis, response surface methodology (RSM), and topology optimization for synergistic lightweighting and performance enhancement of micromanufacturing systems using ultra-precision computer numerical control (CNC) machine tools. Overall sensitivity analysis identified the base and column as stiffness-critical components, while the spindle box exhibited significant weight-reduction potential. Using spindle box wall and bottom thickness as variables, RSM models for mass and stress were constructed. Multi-objective optimization via a genetic clustering algorithm achieved a 57.2% (590 kg) weight reduction under stress constraints (<45 MPa). Subsequent variable-density topology optimization (SIMP model) reconfigured the rib layouts of the base and column under volume constraints, reducing their weights by 38.5% (2844 kg) and 41.5% (1292 kg), respectively. Whole-machine validation showed that maximum static deformation decreased from 0.17 mm to 0.09 mm, maximum stress reduced from 58 MPa to 35 MPa, and first-order natural frequency increased from 50.68 Hz to 84.08 Hz, significantly enhancing dynamic stiffness. Cumulative weight reduction exceeded 3000 kg, achieving a balance between lightweighting and static/dynamic performance improvement. This work provides an effective engineering pathway for a structural design of high-end micromanufacturing systems.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 9","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12471825/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176532","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Gate-Induced Static and Dynamic Nonlinearity Characteristics of Bilayer Graphene Field-Effect Transistors (Bi-GFETs). 双层石墨烯场效应晶体管（bi - gfet）栅致静态和动态非线性特性。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-09 DOI: 10.3390/mi16091031

Varun Kumar Kakar, Munindra, Pankaj Kumar Pal

{"title":"Gate-Induced Static and Dynamic Nonlinearity Characteristics of Bilayer Graphene Field-Effect Transistors (Bi-GFETs).","authors":"Varun Kumar Kakar, Munindra, Pankaj Kumar Pal","doi":"10.3390/mi16091031","DOIUrl":"10.3390/mi16091031","url":null,"abstract":"In this study, the nonlinearity characteristics of bilayer graphene field-effect transistors (Bi-GFETs) are analyzed by using a small-signal equivalent circuit. The static nonlinearity is determined by applying mathematical operation on the drain current equation of Bi-GFETs. Furthermore, the closed expressions for the second- and third-order harmonic distortion (HD) and the intermodulation (IM) distortion of the second- and third-order for Bi-GFETs are analyzed graphically. Dynamic nonlinearity is studied and illustrated in the results by examining the input and output characteristics; i.e., the drain current versus the negative drain to the source voltage and the transfer characteristic curve at various gate voltages controlled by both the top gate as well as the back gate. The characteristic behavior of the gate voltage in Bi-GFETs at short channel lengths is observed and compared; that is, the characteristic curves exhibits strong nonlinearity, with a low power point with some kinks at high gate biasing and a constant linear region at low gate biasing. The quantitative values of the second-order harmonic distortion (HD) and intermodulation distortion (IM) of the proposed analytical model are -40 dB and -45 dB. Quantitative and qualitative outcomes of the characteristics of Bi-GFETs are compared with existing experimental data, which is available in the literature.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 9","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12471557/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176419","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual-Mode Reconfigurable Frequency-Selective Surface for Switching Between Narrowband and Wideband Applications. 用于窄带和宽带应用切换的双模可重构频率选择表面。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-08 DOI: 10.3390/mi16091030

Batuhan Uslu, Sena Esen Bayer Keskin, Nurhan Türker Tokan

引用次数: 0

Study on the Preparation of Diamond Film Substrates on AlN Ceramic and Their Performance in LED Packaging. AlN陶瓷金刚石薄膜衬底的制备及其在LED封装中的性能研究。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-08 DOI: 10.3390/mi16091029

Shasha Wei, Yusheng Sui, Yunlong Shi, Junrong Chen, Tianlei Dong, Rongchuan Lin, Zheqiao Lin

引用次数: 0

Effect of Bias Voltage on the Crystal Growth of AlN(002) Thin Films Fabricated by Reactive Magnetron Sputtering. 偏置电压对反应磁控溅射制备AlN（002）薄膜晶体生长的影响。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-08 DOI: 10.3390/mi16091027

Yong Du, Haowen Zou, Tiejun Li, Guifang Shao

引用次数: 0

Advancements in Wearable Antenna Design: A Comprehensive Review of Materials, Fabrication Techniques, and Future Trends in Wireless Communication. 可穿戴天线设计的进展：无线通信材料、制造技术和未来趋势的综合回顾。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-08 DOI: 10.3390/mi16091028

Zhikai Cao, Mai Lu

{"title":"Advancements in Wearable Antenna Design: A Comprehensive Review of Materials, Fabrication Techniques, and Future Trends in Wireless Communication.","authors":"Zhikai Cao, Mai Lu","doi":"10.3390/mi16091028","DOIUrl":"10.3390/mi16091028","url":null,"abstract":"With the continuous development of wireless communication technology, the demand for wearable communication devices has rapidly increased. The antenna is one of the key components in communication devices, directly affecting the performance of wearable communication devices. As a result, wearable antenna design has become a research hotspot in recent years. Wearable antennas are widely used in various fields of daily life, including healthcare, sports and entertainment, the internet of things (IoT), and military positioning. In the last decade, related researchers have studied wearable antennas from various perspectives, and this paper summarizes the design and fabrication of wearable antennas more comprehensively and systematically. This review covers material selection, manufacturing techniques, miniaturization technologies, and performance metrics, while addressing key design considerations. It also highlights recent research, applications in critical fields, and future development trends, offering valuable insights for the design and study of wearable antennas.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 9","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12471413/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Neural Synaptic Simulation Based on ZnAlSnO Thin-Film Transistors. 基于ZnAlSnO薄膜晶体管的神经突触模拟。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-07 DOI: 10.3390/mi16091025

Yang Zhao, Chao Wang, Laizhe Ku, Liang Guo, Xuefeng Chu, Fan Yang, Jieyang Wang, Chunlei Zhao, Yaodan Chi, Xiaotian Yang

{"title":"Neural Synaptic Simulation Based on ZnAlSnO Thin-Film Transistors.","authors":"Yang Zhao, Chao Wang, Laizhe Ku, Liang Guo, Xuefeng Chu, Fan Yang, Jieyang Wang, Chunlei Zhao, Yaodan Chi, Xiaotian Yang","doi":"10.3390/mi16091025","DOIUrl":"10.3390/mi16091025","url":null,"abstract":"In the era of artificial intelligence, neuromorphic devices that simulate brain functions have received increasingly widespread attention. In this paper, an artificial neural synapse device based on ZnAlSnO thin-film transistors was fabricated, and its electrical properties were tested: the current-switching ratio was 1.18 × 107, the subthreshold oscillation was 1.48 V/decade, the mobility was 2.51 cm2V-1s-1, and the threshold voltage was -9.40 V. Stimulating artificial synaptic devices with optical signals has the advantages of fast response speed and good anti-interference ability. The basic biological synaptic characteristics of the devices were tested under 365 nm light stimulation, including excitatory postsynaptic current (EPSC), paired-pulse facilitation (PPF), short-term plasticity (STP), and long-term plasticity (LTP). This device shows good synaptic plasticity. In addition, by changing the gate voltage, the excitatory postsynaptic current of the device at different gate voltages was tested, two different logical operations of \"AND\" and \"OR\" were achieved, and the influence of different synaptic states on memory was simulated. This work verifies the application potential of the device in the integrated memory and computing architecture, which is of great significance for promoting the high-quality development of neuromorphic computing hardware.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 9","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12471619/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Meta-Optics for Optical Engineering of Next-Generation AR/VR Near-Eye Displays. 下一代AR/VR近眼显示光学工程的元光学。

IF 3 3区工程技术

Micromachines Pub Date : 2025-09-07 DOI: 10.3390/mi16091026

Junoh Lee, Sun-Je Kim

{"title":"Meta-Optics for Optical Engineering of Next-Generation AR/VR Near-Eye Displays.","authors":"Junoh Lee, Sun-Je Kim","doi":"10.3390/mi16091026","DOIUrl":"10.3390/mi16091026","url":null,"abstract":"Meta-optics, enabled by metasurfaces consisting of two-dimensional arrays of meta-atoms, offers ultrathin and multi-functional control over the vectorial wavefront of light at subwavelength scales. The unprecedented optical element technology is a promising candidate to overcome key limitations in augmented reality (AR) and virtual reality (VR) near-eye displays particularly in achieving compact, eyeglass-type form factors with a wide field-of-view, a large eyebox, high resolution, high brightness, and reduced optical aberrations, at the same time. This review highlights key performance bottlenecks of AR/VR displays in the perspective of optical design, with an emphasis on their practical significance for advancing current technologies. We then examine how meta-optical elements are applied to VR and AR systems by introducing and analyzing the major milestone studies. In case of AR systems, particularly, two different categories, free-space and waveguide-based architectures, are introduced. For each category, we summarize studies using metasurfaces as lenses, combiners, or waveguide couplers. While meta-optics enables unprecedented miniaturization and functionality, it also faces several remaining challenges. The authors suggest potential technological directions to address such issues. By surveying recent progress and design strategies, this review provides a comprehensive perspective on the role of meta-optics in advancing the optical engineering of next-generation AR/VR near-eye displays.","PeriodicalId":18508,"journal":{"name":"Micromachines","volume":"16 9","pages":""},"PeriodicalIF":3.0,"publicationDate":"2025-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12471599/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145176498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0