Microwave and Optical Technology Letters最新文献_第10页

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

An All-Metal Slotted Waveguide Antenna for 79 GHz Automotive Radar Applications 用于79 GHz汽车雷达的全金属开槽波导天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-06 DOI: 10.1002/mop.70183

Jinghu Sun, Leyao Wu, Xinwei Chen, Ronglin Li, Xiuyin Zhang, Yuehui Cui

{"title":"An All-Metal Slotted Waveguide Antenna for 79 GHz Automotive Radar Applications","authors":"Jinghu Sun, Leyao Wu, Xinwei Chen, Ronglin Li, Xiuyin Zhang, Yuehui Cui","doi":"10.1002/mop.70183","DOIUrl":"https://doi.org/10.1002/mop.70183","url":null,"abstract":"<div>\u0000 \u0000 <p>An all-metal slotted waveguide antenna is proposed for 79 GHz millimeter-wave automotive radar applications. The slotted waveguide antenna consists of a jagged rectangular waveguide cavity with four rectangular slots which forms a linear array. A TE<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mrow></mrow>\u0000 \u0000 <mn>140</mn>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${}_{140}$</annotation>\u0000 </semantics></math> mode is excited in the rectangular cavity by a rectangular waveguide feed at the bottom center of the cavity. Four radiating slots are introduced above the jagged cavity to enhance the radiation of the slotted cavity, thus improving the impedance matching and increasing the antenna gain. Simulation and measurement results show that the all-metal slotted waveguide antenna achieves a peak gain of 14 dBi with a fan-beam radiation pattern and an impedance bandwidth of 7%, covering the 79 GHz band (76–81 GHz) for global automotive radar sensors. A two-transmit/two-receive (2-TX/2-RX) antenna module is investigated. The isolations between TX antennas and between RX antennas are higher than 30 dB. A 6-TX/8-RX antenna module is developed to demonstrate the potential for commercial automotive radar sensors. Stable radiation patterns and antenna gains are obtained for all of the TX/RX antennas, suitable for automotive radar applications.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143787021","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 A 26/36 GHz Dual-Band GaN MMIC Power Amplifier 26/36 GHz双频GaN MMIC功率放大器的设计

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-04-01 DOI: 10.1002/mop.70187

Qi Cai, Dingyuan Zeng, Haoshen Zhu, Quan Xue, Wenquan Che

引用次数: 0

28/38 GHz MEMS-Controlled SIW Antenna for 5G Communication Systems 用于5G通信系统的28/38 GHz mems控制SIW天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-03-31 DOI: 10.1002/mop.70182

Asmaa E. Farahat, Khalid F. A. Hussein

{"title":"28/38 GHz MEMS-Controlled SIW Antenna for 5G Communication Systems","authors":"Asmaa E. Farahat, Khalid F. A. Hussein","doi":"10.1002/mop.70182","DOIUrl":"https://doi.org/10.1002/mop.70182","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel design for a reconfigurable antenna is proposed for 5G communication systems. The antenna operates in two bands 28 and 38 GHz. Two parallel slots have been created in the upper surface of the SIW antenna cavity. The configurability of the antenna is achieved through a rotary strip where the orientation of the strip specifies the operating frequency of either 28 or 38 GHz. The controlling strip can be rotated while touching the upper external wall surface of the SIW cavity through a micro-electro-mechanical system (MEMS) servomotor. At the orientation where the rotary strip is rotated to be normal to the feed line and parallel to the slots, it operates at 28 GHz. At the orientation where the rotary strip is rotated to be parallel to the feed line and normal to the slots, it operates at 38 GHz. When the rotary strip is normal to the two radiating slots, it divides each slot into two equal slots. The radiation efficiency is improved by the dual-slot configuration at the two operating frequencies 28 and 38 GHz. The bandwidth at 28 GHz band is 1.1 GHz and at 38 GHz band 0.9 GHz. The peak value of the gain at the 28 GHz band is 5.4 dBi with a radiation efficiency of 80.5% and at the 38 GHz band 6 dBi with a radiation efficiency of 82%. To verify the achieved numerical results by simulations, a prototype of the antenna is fabricated and subjected to practical measurements showing good consent with the simulation results.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143741633","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