Microwave and Optical Technology Letters最新文献_第3页

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

A 77 GHz Millimeter-Wave Comb Antenna With Suppressed Side-Lobe 一种抑制旁瓣的77ghz毫米波梳状天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-03-31 DOI: 10.1002/mop.70185

Jia Zhou, Qirui Wang, Yujie Yang, Yalun Li, Kai Kang, Hongyan Tang

引用次数: 0

A High Bandwidth X Band Monopulse Comparator for Tracking Radio Detection and Ranging 用于跟踪无线电探测和测距的高带宽X波段单脉冲比较器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-03-31 DOI: 10.1002/mop.70188

Rashmi Priyadarshini B. K., Anil Kumar H. L., Rajendra Prasad P., Saikeerthika K., Malavika S.

{"title":"A High Bandwidth X Band Monopulse Comparator for Tracking Radio Detection and Ranging","authors":"Rashmi Priyadarshini B. K., Anil Kumar H. L., Rajendra Prasad P., Saikeerthika K., Malavika S.","doi":"10.1002/mop.70188","DOIUrl":"https://doi.org/10.1002/mop.70188","url":null,"abstract":"<div>\u0000 \u0000 <p>Mono-pulse antennas in radio detection and ranging (RADAR) has been a significant focus. The accurate localization and tracking of targets remain fundamental challenges in various RADAR applications. This paper introduces a cutting-edge X-band mono-pulse comparator (MPC) designed for exceptional tracking performance. The precise target tracking system lies the eight-port mono-pulse comparator. Its four input channels—sum, azimuth difference, elevation difference, and a guarded port—feed into a sophisticated network that generates four output channels: sum, azimuth, elevation, and a termination port. This high-bandwidth design enables the MPC to deliver accurate angle measurements, ensuring effective target tracking. The inclusion of a mono-pulse antenna in the design proves instrumental in reducing side lobes, contributing to improved tracking accuracy. The high-bandwidth MPC demonstrates superior target azimuth measurement compared to angular position estimation. When integrated with an active antenna array unit, the MPC achieves exceptional performance metrics, including a side lobe of better than –30 dB and a null depth exceeding –50 dB. This high-bandwidth mono-pulse comparator excels in providing a return loss or voltage standing wave ratio surpassing –10 dB across a bandwidth of over 1 GHz.</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":"143741621","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

Spatiotemporal Detection of the Carbon Dioxide Using a Compact Differential Absorption LiDAR 基于紧凑差分吸收激光雷达的二氧化碳时空探测

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-03-28 DOI: 10.1002/mop.70184

Tao Zhu, Boyang Xue, Hui Li, Zhangjun Wang, Chao Chen

{"title":"Spatiotemporal Detection of the Carbon Dioxide Using a Compact Differential Absorption LiDAR","authors":"Tao Zhu, Boyang Xue, Hui Li, Zhangjun Wang, Chao Chen","doi":"10.1002/mop.70184","DOIUrl":"https://doi.org/10.1002/mop.70184","url":null,"abstract":"<div>\u0000 \u0000 <p>Carbon dioxide (CO<sub>2</sub>) is a major greenhouse gas contributing to climate change. Especially, the real-time monitoring of its spatial and temporal variations have drawn significant attention in the past few decades. In the present work, we proposed a Differential Absorption LiDAR (DIAL) system for the CO<sub>2</sub> concentration profiling. By employing a dual-wavelength 1.5 μm fiber laser and an InGaAs/InP negative feedback avalanche diode (NFAD) based free-running single-photon detector (SPD), it allowed the system to be compact, with low power consumptions. Comparisons between different laser pulse durations, laser pulse energies and peak powers were performed in terms of the signal-to-noise ratio (<i>SNR</i>) of the backscattering signals of the LiDAR. It is shown that the three parameters have a combined effect on the signal response behavior. After the optimization of the laser pulse energy, the signal integration time, and the workflow of CO<sub>2</sub> profile retrieval, the analytical performance of the LiDAR system has been evaluated. The temporal evolution of the measured CO<sub>2</sub> concentration nicely coincides with the values from a standard CO<sub>2</sub> detector, with a correlation coefficient higher than 0.7 and a relative standard deviation within 6.8%. Subsequently, vertical observations were carried out to obtain the height-time plot of the CO<sub>2</sub> concentrations, with a high spatial-temporal resolution of 25 m and 15 min, respectively. The results indicated a diurnal variation of CO<sub>2</sub> concentration at the nearshore region. This compact DIAL system shows promising analytical potential streamlining online monitoring of atmospheric CO<sub>2</sub> over the ocean based on buoy platforms.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143717244","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

Fiber Sensor for Liquid Level Detection Based on Micro-Arc Air Cavity Structure 基于微弧气腔结构的光纤液位传感器

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-03-27 DOI: 10.1002/mop.70186

Shuqin Cao, Beibei Mao, Weihao Cheng, Mingzhu Yang, Jingfei Ye, Yongfeng Wu

{"title":"Fiber Sensor for Liquid Level Detection Based on Micro-Arc Air Cavity Structure","authors":"Shuqin Cao, Beibei Mao, Weihao Cheng, Mingzhu Yang, Jingfei Ye, Yongfeng Wu","doi":"10.1002/mop.70186","DOIUrl":"https://doi.org/10.1002/mop.70186","url":null,"abstract":"<div>\u0000 \u0000 <p>A novel liquid level sensor is devised, leveraging the principle of Fabry-Perot interferometry (FPI). The sensor amalgamates micro-arc and air cavity structures. The micro-arc is fabricated through flame pyrolysis, while the air cavity is created by fusion splicing a SiO<sub>2</sub> microtube with single-mode fiber (SMF). When alterations occur in either the liquid level or temperature, the spectral information primarily manifests as variations in reflected light intensity. Consequently, it provides a new perspective for liquid level and temperature measurements. The FPI sensor is a three-wave interference model. To realize low-temperature sensitivity, an optical fiber is fused at the end of FPI to reduce the reflection of the third reflector. The temperature sensitivity of the sensor is measured at 0.0856 dB/°C, the liquid level sensitivity is determined to be 0.2185 dB/mm. Therefore, the sensor is suitable for conducting liquid level measurements in industrial applications. Additionally, the sensor is simple in structure and does not need special treatment, making it highly competitive in industrial production.</p></div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143717311","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 Extremely Low-Profile Wideband Patch Antenna for 5G Smartphones 用于5G智能手机的极低姿态宽带贴片天线

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-03-26 DOI: 10.1002/mop.70178

Hui Li, Mengdi Liu, Tianxi Feng

引用次数: 0

Design of Photonic Crystal All-Optical Analog-to-Digital Using Nonlinear Kerr Effect 基于非线性克尔效应的光子晶体全光模数转换设计

IF 1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2025-03-26 DOI: 10.1002/mop.70181

Negar Esmaeili, Fariborz Parandin, Mohammad S. Feali, Farzin Shama

{"title":"Design of Photonic Crystal All-Optical Analog-to-Digital Using Nonlinear Kerr Effect","authors":"Negar Esmaeili, Fariborz Parandin, Mohammad S. Feali, Farzin Shama","doi":"10.1002/mop.70181","DOIUrl":"https://doi.org/10.1002/mop.70181","url":null,"abstract":"<div>\u0000 \u0000 <p>This study presents an innovative approach to the design of an optical analog-to-digital converter (OADC) that employs square nonlinear ring resonators. The configuration consists of dielectric silicon rods alongside nonlinear rods fabricated from doped glass, utilizing the Kerr optical effect to realize the intended operational capabilities. The proposed architecture incorporates a nonlinear three-channel demultiplexer along with an optical encoder. The nonlinear demultiplexer transforms the continuous input signal into three distinct quantized levels, while the optical encoder produces two-bit binary codes corresponding to the demultiplexer's output channel. The performance of this optical analog-to-digital converter (OADC) has been evaluated through plane wave expansion (PWE) and finite difference time domain (FDTD) methodologies. Results demonstrate that the OADC exhibits a compact footprint of 324 µm² and achieves a sampling rate of 125 GS/s, significantly exceeding the capabilities of traditional analog-to-digital converter designs.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"67 4","pages":""},"PeriodicalIF":1.0,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143707527","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