Microwave and Optical Technology Letters最新文献_第2页

Development of a Compact Microstrip Antenna Using Slow-Wave Artificial Dielectric Substrate 利用慢波人工介质基底开发紧凑型微带天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-16 DOI: 10.1002/mop.70191

Elias Rahimi, Mohammad H. Neshati

引用次数: 0

FPGA-Integrated Digital Locking Scheme for Mode-Locked Fiber Lasers 锁模光纤激光器的fpga集成数字锁定方案

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-15 DOI: 10.1002/mop.70193

Ziye Wang, Yanqing Shi, Weiqian Zhao

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Multi-Bit Coding Polarization Conversion Metasurface for RCS Reduction 用于降低 RCS 的多比特编码偏振转换元面

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-15 DOI: 10.1002/mop.70199

Chao Zhang, Jingxuan Cheng, Jiawei Zhang, Qiangming Cai, Yanwen Zhao, Shaojun Guo, Tongsheng Shen

{"title":"Multi-Bit Coding Polarization Conversion Metasurface for RCS Reduction","authors":"Chao Zhang, Jingxuan Cheng, Jiawei Zhang, Qiangming Cai, Yanwen Zhao, Shaojun Guo, Tongsheng Shen","doi":"10.1002/mop.70199","DOIUrl":"https://doi.org/10.1002/mop.70199","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a single-layer multi-bit coding polarization conversion metasurface (MCPCM) designed for the attainment of broadband and wide-angle radar cross section (RCS) reduction. The metasurface unit possesses a symmetrical structure composed of a bidirectional arrow and a defective rectangular ring, making it polarization-insensitive to electromagnetic (EM) waves. The designed metasurface unit exhibits broadband polarization conversion efficiency across the frequency spectrum of 11.2–25.6 GHz, achieving a polarization conversion rate (PCR) beyond 90% and displaying four resonance points. We obtained multi-bit phase responses with phase differences of 180°, 90°, and 45° through the optimized design of the unit's structure. A discrete artificial bee colony (DABC) algorithm optimizes the coding sequence, enhancing RCS reduction performance. Compared with an equivalently sized perfect electric conductor (PEC), the optimized MCPCM achieves over 10 dB RCS reduction within the 11–25 GHz frequency range. Additionally, the optimized MCPCM achieves a broader RCS reduction bandwidth compared to traditional chessboard-patterned metasurfaces. Furthermore, we investigated the proposed MCPCM's bistatic RCS performance, achieving substantial RCS reduction over a broad spectrum of incident angles. Simulation and measurement results validate the proposed metasurface capability for effective EM wave manipulation, demonstrating its potential for broadband and wide-angle RCS reduction.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Investigation of Human Hair by Laser-Induced Breakdown Spectroscopy: Qualitative and Quantitative Analysis of Content Element in Human Hair 人发激光诱导击穿光谱研究：人发中含量元素的定性和定量分析

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-15 DOI: 10.1002/mop.70198

Ines Arbi, Gündüz Yümün, Nursel Sezgin

{"title":"Investigation of Human Hair by Laser-Induced Breakdown Spectroscopy: Qualitative and Quantitative Analysis of Content Element in Human Hair","authors":"Ines Arbi, Gündüz Yümün, Nursel Sezgin","doi":"10.1002/mop.70198","DOIUrl":"https://doi.org/10.1002/mop.70198","url":null,"abstract":"<div>\u0000 \u0000 <p>Human hair is a significant biological sample in forensic science, biomedical research, and the cosmetic industry, with the presence of essential nutrients like zinc, copper, and silicon being indicative of health. This study aimed to investigate the elemental composition of human hair using Laser-Induced Breakdown Spectroscopy (LIBS) to assess differences across age groups. Nine volunteers provided hair samples, which were analyzed using the Foster + Freeman ECCO2 LIBS system. Quantitative analysis of elemental concentrations was performed, and elemental ratios, such as Mg/Ca, Mg/Si, Mg/Fe, and Fe/Mn, were calculated to compare the samples. Results demonstrated that LIBS is a fast, accurate, and non-destructive method for detecting and quantifying mineral elements in human hair. The study highlights age-related differences in elemental concentrations, offering insights into the use of hair analysis for monitoring nutritional and health status. LIBS could be a promising tool for further studies in clinical and forensic applications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advancements in Optical Glucose Sensing for Diabetes Diagnostics and Monitoring 光学葡萄糖传感在糖尿病诊断和监测中的研究进展

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-15 DOI: 10.1002/mop.70190

Sobia Wassan, Rana Muhammad Amir Latif, Liudajun, Han Ying, Muhammad Farhan, Wasif Akbar

{"title":"Advancements in Optical Glucose Sensing for Diabetes Diagnostics and Monitoring","authors":"Sobia Wassan, Rana Muhammad Amir Latif,  Liudajun, Han Ying, Muhammad Farhan, Wasif Akbar","doi":"10.1002/mop.70190","DOIUrl":"https://doi.org/10.1002/mop.70190","url":null,"abstract":"<div>\u0000 \u0000 <p>Diabetes presents a major global health challenge, with an increasing prevalence worldwide. Early detection and continuous glucose monitoring are pivotal to effective diabetes management. Optical glucose sensing is a promising noninvasive alternative to traditional methods, such as finger-prick blood glucose tests. This study explores the cutting-edge techniques employed in optical glucose sensing, such as Fluorescence, Raman spectroscopy, and near-infrared spectroscopy. Recent advancements in nanotechnology, photonic materials, and machine learning algorithms are discussed, focusing on overcoming current limitations. The integration of these technologies is propelling the development of highly sensitive, accurate, and real-time glucose monitoring systems. Despite challenges such as calibration complexities, biological interference, and limited tissue penetration, ongoing research and innovative solutions such as adaptive AI-driven calibration, multi-layer sensing, and improved light source technologies are addressing these limitations. Optical glucose sensing promises to transform diabetes management by enabling continuous, personalized, and proactive care.in this article, we highlight the potential of optical glucose sensing in revolutionizing diabetes care and its role in future personalized medicine.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143835768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Near-Infrared CO Sensor Based on Small Multi-Pass Gas Cell and GCRA-BiLSTM Model in Underground Parking 基于小型多通气池和gra - bilstm模型的地下停车场近红外CO传感器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-14 DOI: 10.1002/mop.70200

Minghao Cai, Guangzhao Cui, Ruixiang Sun, Yingjie Zhao, Longju Li, Haoran Yuan, Guolin Li

{"title":"Near-Infrared CO Sensor Based on Small Multi-Pass Gas Cell and GCRA-BiLSTM Model in Underground Parking","authors":"Minghao Cai, Guangzhao Cui, Ruixiang Sun, Yingjie Zhao, Longju Li, Haoran Yuan, Guolin Li","doi":"10.1002/mop.70200","DOIUrl":"https://doi.org/10.1002/mop.70200","url":null,"abstract":"<div>\u0000 \u0000 <p>Due to the influence of automobile exhaust in underground parking lots all year round, a large amount of carbon monoxide (CO) gas accumulates in underground parking lots, endangering the safety of human lives. Based on tunable diode laser absorption spectroscopy (TDLAS) technology, a CO gas detection system is designed to be applied in underground parking lots. A distributed feedback baser (DFB) laser was used to scan the CO absorption peak at 1.566 μm, avoiding interference from other background gases. A small multi-pass gas cell (MPGC) was designed with a volume of only 704 cm<sup>3</sup> and an effective optical range of up to 26 m. An improved wavelet thresholding denoising-complete esemble empirical mode decomposition with adaptive noise (IWTD-CEEMDAN) denoising algorithm was designed to filter out the effects of background noise, thereby improving the signal-to-noise ratio (SNR) and lowering the detection limit of the system. A greater cane rat algorithm-bidirectional long short-term memory (GCRA-BiLSTM) concentration inversion algorithm was designed to improve the accuracy of the system concentration inversion. According to the Allan variance, the limit of detection (LoD) of the sensor is 11.57 ppm at 1 s and 0.124 ppm at 117 s. A series of experiments are carried out on the sensor, and the experimental results show that the sensor has good linearity, stability, and LoD, which can realize the real-time monitoring of underground garage CO, and it has an important application value.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143826820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Generation of Electromagnetic OAM Vortex Waves Using a Simple Conformal Antenna Array 利用简单共形天线阵列产生电磁OAM涡旋波

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-13 DOI: 10.1002/mop.70195

Zhengyi Yang, Shanxiang Wei, Liping Shao

引用次数: 0

Novel Spiral Antenna for GNSS Applications 用于GNSS应用的新型螺旋天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-12 DOI: 10.1002/mop.70192

Olcay Yiğit

引用次数: 0

A Low-Profile Wide-Angle Multiband Multifunctional Reflective Polarization Conversion Metasurface 低矮型宽角度多波段多功能反射偏振转换元表面

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-12 DOI: 10.1002/mop.70194

Bao Zhang, Qi Xie, Tianxing Gao, Shui Liu, Feng Xu

{"title":"A Low-Profile Wide-Angle Multiband Multifunctional Reflective Polarization Conversion Metasurface","authors":"Bao Zhang, Qi Xie, Tianxing Gao, Shui Liu, Feng Xu","doi":"10.1002/mop.70194","DOIUrl":"https://doi.org/10.1002/mop.70194","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel multifunctional reflective polarization conversion metasurface (RPCM) is proposed in this letter. The unit cell of the metasurface (MTS) consists of a phase compensation dielectric layer at the top, an elliptical patch with a bent metal strip, a dielectric layer, and a reflective metal plate at the bottom. Simulations demonstrate that the MTS effectively converts a normally incident 45-degree polarized wave into a cross-polarized wave within the frequency bands 7.1–7.65 and 10.9–14.2 GHz, right-handed circularly polarized (RHCP) waves in the 5.33–7.0 GHz band, and left-handed circularly polarized (LHCP) waves in the 7.79–10.5 and 14.64–19.66 GHz bands. The performance under oblique incidence was also investigated, revealing that the introduction of the phase compensation dielectric layer ensures stable polarization conversion across the primary operating frequency ranges, even at a 45-degree incident angle. Notably, the 14.64–19.66 GHz band demonstrates angular stability up to 55 degrees. The underlying physical mechanisms of polarization conversion are examined through surface current analysis and equivalent circuit modeling. A prototype consisting of 20 × 20 unit cells was fabricated and experimentally characterized, with measurements closely matching the simulated results. The proposed MTS offers significant potential for polarization control in applications such as microwave communications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143824644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of Omnidirectional Reflectionless Absorbing Surface for Dual-Frequency Microwave Imaging 双频微波成像全向无反射吸收面设计

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-10 DOI: 10.1002/mop.70196

Tian Peng, Xiangyu Zhou, Wuyin Huang, Tianyi Zhou, Lixia Yang

{"title":"Design of Omnidirectional Reflectionless Absorbing Surface for Dual-Frequency Microwave Imaging","authors":"Tian Peng, Xiangyu Zhou, Wuyin Huang, Tianyi Zhou, Lixia Yang","doi":"10.1002/mop.70196","DOIUrl":"https://doi.org/10.1002/mop.70196","url":null,"abstract":"<div>\u0000 \u0000 <p>Inverse scattering-based microwave imaging has been an important subject of scientific research and practical engineering for centuries. In practice, anechoic chambers were always chosen as the optimal operating environment for microwave imaging. With large floor space and ultrahigh cost of an anechoic chamber, microwave imaging experiments in practical engineering applications remain a technical challenge. In this study, dual-frequency and dual-angle reflectionless absorbing units were designed and implemented, based on which a portable miniaturized imaging chamber was further established. For demonstration, practical imaging experiments were performed to reconstruct the profile of the object under imaging (OUI) which verified the effectiveness of the implemented dual-frequency imaging chamber. Taking advantage of the design method, imaging chambers can be customized on demand of the desired size of the OUI. With a dual-frequency imaging algorithm, we foresee the improvement of the image quality of the OUI which is of great importance for practical application.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143809847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0