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

Development of a Fiber Optic Surface Plasmon Resonance Sensor for Salinity Sensing 光纤表面等离子体共振传感器的研制

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-10-03 DOI: 10.1002/mop.70813

Shikha Sachdeva, Navneet K. Sharma

引用次数: 0

3D Printed Compact Dual-Band Bandpass Filter Based on Modified Strong Coupled Coaxial Resonator 基于改进强耦合同轴谐振腔的3D打印紧凑型双带带通滤波器

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-10-03 DOI: 10.1002/mop.70796

Chao Li, Zhaoyang Li, Jiayu Rao, Gang Zhang, Kuosheng Jiang

引用次数: 0

Flexible High-Scanning-Rate Leaky-Wave Antenna Based on Phase Compensation and Double-Sided Parallel-Strip Line Slow-Wave Structure 基于相位补偿和双面平行条形线慢波结构的柔性高扫描速率漏波天线

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-10-03 DOI: 10.1002/mop.70814

Hao Ni, Leilei Liu, Lei Zhu, Guoqing Luo

{"title":"Flexible High-Scanning-Rate Leaky-Wave Antenna Based on Phase Compensation and Double-Sided Parallel-Strip Line Slow-Wave Structure","authors":"Hao Ni, Leilei Liu, Lei Zhu, Guoqing Luo","doi":"10.1002/mop.70814","DOIUrl":"https://doi.org/10.1002/mop.70814","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a flexible high-scanning-rate leaky-wave antenna (LWA) based on phase compensation and double-sided parallel-strip line (DSPSL) slow-wave structure is presented. The larger gradient of dispersion is achieved by the tapered open-ended stubs, thus achieving the high-scanning-rate. A phase compensation method is proposed and implemented by gradually varying the groove depth of the open-ended stubs, to passively correct the wavefront distortion when the antenna is bent, thereby preserving radiation pattern quality. In order to verify the method, the prototype of the proposed LWA was fabricated, and simulated and measured results are in good accordance with each other. The LWA is able to scan from −90° to +22° when it is flat and from −90° to +30° when it is bent with the designed bending radius of 150 mm in the frequency range of 9–10.2 GHz. The scanning-rate of this LWA achieved 100°/GHz. The proposed LWA holds the advantage of flexible, low profile, high-scanning-rate, and radiation efficiency, and it has broad application prospects in the field of flexible systems in the future.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 10","pages":""},"PeriodicalIF":1.1,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145784","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

Acoustic Detector Based on an Unbalanced Single-Arm Fiber-Optic Interferometer: Application to 2-FSK Digital Transmission Along a Solid Aluminum Rod 基于非平衡单臂光纤干涉仪的声探测器：在沿固体铝棒2-FSK数字传输中的应用

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-10-03 DOI: 10.1002/mop.70806

Alexandre C. T. Santos, Ricardo M. Ribeiro

{"title":"Acoustic Detector Based on an Unbalanced Single-Arm Fiber-Optic Interferometer: Application to 2-FSK Digital Transmission Along a Solid Aluminum Rod","authors":"Alexandre C. T. Santos, Ricardo M. Ribeiro","doi":"10.1002/mop.70806","DOIUrl":"https://doi.org/10.1002/mop.70806","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper presents a simple and easy to build fiber-optic acoustic detector based on an unbalanced Single-Arm Fiber-Optic Interferometer (SAFI). The latter can be described as a low-finesse Fabry-Perot structure. The sensing cavity was easily created when a weakly (0.01%) reflective FC/PC connection couples a piece (< 2 m length) of a singlemode <i>pigtail</i> fiber with an optical circulator. The other end of the sensing fiber-cavity (s-fiber) was orthogonally cleaved thus reflecting a power fraction over 3.5%. This simple and highly unbalanced SAFI can work as an acoustic detector. When a fusion splice was performed instead of the FC/PC connection no acoustic detection was observed. Characterization of acoustic sensitivity around 42.9 kHz frequency was carried out while varying the length of the <i>loose</i> s-fiber from 175 to 195 cm yielding a sensitivity increase. Similar results, but with quite reduced amplitude were achieved when the s-fiber was <i>tight</i>. In order to demonstrate the feasibility of the proposed interferometer as an acoustic detector, a 2-FSK digital transmission through a 0.51-m-long solid aluminum rod was performed, with no detected bit errors in several 2-kbit bursts at a rate of 1.2 kbit/s, using a 30-ms symbol interval comprising the bit slot and guard band.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 10","pages":""},"PeriodicalIF":1.1,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145781","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

Machine Learning Assisted Approach for Characteristic Mode Tracking 特征模式跟踪的机器学习辅助方法

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-10-03 DOI: 10.1002/mop.70811

Hui Li, Zhaolin Li, Chang Qu, Jiapeng Zhang

{"title":"Machine Learning Assisted Approach for Characteristic Mode Tracking","authors":"Hui Li, Zhaolin Li, Chang Qu, Jiapeng Zhang","doi":"10.1002/mop.70811","DOIUrl":"https://doi.org/10.1002/mop.70811","url":null,"abstract":"<div>\u0000 \u0000 <p>Characteristic mode (CM) tracking is important and challenging for CM computations, especially for complicated structures. In this paper, a machine learning (ML)-based method is proposed to track the CM effectively and efficiently, thus removing the mode swapping at the crossing frequencies. Due to the typical time-series (TS) characteristics of the mode data at different frequencies, a dynamic classification method based on a long short-term memory (LSTM) neural network is exploited to classify the modes over a frequency band for mode tracking. The untracked CMs are firstly selected as the training dataset, which is updated periodically during tracking. By updating the network with the tracked mode data, the proposed method solves the mode degradation problem that often occurs in conventional mode tracking methods. To validate the method, the modes of a simple metallic plate and a complicated fractal antenna are tracked. Compared with the tracking method in Altair FEKO, the proposed LSTM-based method provides accurate tracking results with less mesh elements, using less computational time as well.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 10","pages":""},"PeriodicalIF":1.1,"publicationDate":"2026-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145782","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 Differential FDR Microwave Soil Moisture Sensor Using an Exponential Tapered Line 基于指数变细线的差分FDR微波土壤水分传感器设计

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-10-01 DOI: 10.1002/mop.70808

Eonho Lee, Hosung Choo, Sungjun Yoo

{"title":"Design of a Differential FDR Microwave Soil Moisture Sensor Using an Exponential Tapered Line","authors":"Eonho Lee, Hosung Choo, Sungjun Yoo","doi":"10.1002/mop.70808","DOIUrl":"https://doi.org/10.1002/mop.70808","url":null,"abstract":"<div>\u0000 \u0000 <p>This paper proposes a differential frequency domain reflectometry (FDR) microwave soil moisture sensor employing an exponential tapered line to obtain improved impedance matching characteristics in a non-uniform microstrip line structure. In the proposed sensor, the width of the central microstrip line is set to 2 mm to obtain a distinct peak value in the sensing-band, while the feed microstrip line width is designed as 5 mm to achieve high skirt characteristics in the reference-band. To improve the impedance matching characteristics of the non-uniform microstrip lines, an exponential tapered line is applied to the feeding line structure. As a result, the proposed sensor simultaneously achieves the distinct peak value and high skirt characteristics. In addition, triangular spiral resonator and rectangular spiral resonator structures are employed to implement the differential FDR method, making the sensing- and reference-bands, respectively. The fabricated sensor is experimentally evaluated under various volumetric water content (VWC) conditions. When the VWC (%) varies from 0% to 20%, the frequency difference between the sensing- and reference-bands <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>f</mi>\u0000 \u0000 <mi>d</mi>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${f}_{d}$</annotation>\u0000 </semantics></math> shifts from 3150 MHz to 1925 MHz with a coefficient of determination <i>R</i><sup>2</sup> of 0.926. These results demonstrate that the proposed sensor is suitable for smart farming applications requiring accurate soil moisture monitoring.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 10","pages":""},"PeriodicalIF":1.1,"publicationDate":"2026-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149145758","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

Wideband Shared-Aperture Circularly Polarized Antenna With Large Frequency Ratio Based on Fabry-Perot Cavity 基于法布里-珀罗腔的宽带大频率比共孔径圆极化天线

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-10-01 DOI: 10.1002/mop.70797

Jin-Jin Lin, Zhi-Hong Tu, Yun Wang

引用次数: 0

Broadband, Low Profile, Circularly Polarized, Slot Antenna With S-Shaped Coupling Structure for Vehicle-to-Satellite Communications 车星通信中宽带、低轮廓、圆极化、s型耦合结构缝隙天线

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-09-30 DOI: 10.1002/mop.70802

Lu Chang, Chao Wang

引用次数: 0

A Compact Dual-Band Filtering Antenna With Slot-Modified Ground Plane for 2.4/4 GHz Short-Range Wireless Applications 一种适用于2.4/4 GHz短距离无线应用的紧凑型双频滤波天线

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-09-30 DOI: 10.1002/mop.70790

Haofei Xie, Qirui An, Xin Kang, De-Yi Xiong, Fan Yang

{"title":"A Compact Dual-Band Filtering Antenna With Slot-Modified Ground Plane for 2.4/4 GHz Short-Range Wireless Applications","authors":"Haofei Xie, Qirui An, Xin Kang, De-Yi Xiong, Fan Yang","doi":"10.1002/mop.70790","DOIUrl":"https://doi.org/10.1002/mop.70790","url":null,"abstract":"<div>\u0000 \u0000 <p>In this letter, a compact dual-band filtering antenna with a slot-modified ground plane is proposed for 2.4 and 4 GHz dual-band short-range wireless applications. The filtering antenna is implemented on a single piece of FR4 substrate. It consists of a feeding line, two long rectangular slots, a semicircular annular patch, and a peripheral via array. The two long rectangular slots are mainly utilized to generate three resonances so as to form the passband. The annular patch is employed to introduce an additional resonance to broaden the impedance bandwidth. The peripheral via array is added to reshape the bottom layer current distribution to suppress unwanted modes and enhance the filtering response. To verify the design concept, the prototype is fabricated and measured. The measured results are in good agreement with the simulated ones demonstrating that the antenna achieves two operating bands centered at 2.52 and 4.16 GHz, with an impedance bandwidth of 41.5% and 7.3%, respectively. The measured peak realized gains are 7.0 dBi and 4.5 dBi in the lower and upper passbands, respectively, while the radiation patterns maintain good radiation characteristics.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 10","pages":""},"PeriodicalIF":1.1,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149147019","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

Polarization Insensitive Sensing for Direction of Arrival by Programmable Metasurface 可编程超表面到达方向的偏振不敏感传感

IF 1.1 4区工程技术

Microwave and Optical Technology Letters Pub Date : 2026-09-30 DOI: 10.1002/mop.70810

Shi Yu Wang, Zhi Lei Zhang, Xian Kun Zeng, Yong Han Liu, Yun Bo Li

{"title":"Polarization Insensitive Sensing for Direction of Arrival by Programmable Metasurface","authors":"Shi Yu Wang, Zhi Lei Zhang, Xian Kun Zeng, Yong Han Liu, Yun Bo Li","doi":"10.1002/mop.70810","DOIUrl":"https://doi.org/10.1002/mop.70810","url":null,"abstract":"<div>\u0000 \u0000 <p>We propose a new design of polarization insensitive sensing for Direction of Arrival (DoA) achieved by programmable metasurface with independent control of dynamic phase under dual-polarization. The unit cell of metasurface is constructed by multi-layer structure mainly including one dual-polarization patch for receiving of spatial electromagnetic (EM) signal with any polarization and two programmable phase shifters for each polarization. All of the EM power collected from each unit cell will be concentrated by one power-combining network integrated in the middle layer of metasurface to acquire the total receiving signal corresponding to each polarization. Accordingly, the spatial sensing matrix composed of diverse receiving patterns can be generated by randomly controlling the programmable phase shift in each unit cell, and the DoA estimation will be actualized by utilizing the compressive sensing method due to the information received from each polarized port. One prototype of metasurface is fabricated and measured, the DoA estimation in the azimuth plane of single source and two sources under different polarization states have been solved precisely under the center frequency of 4.8 GHz with a relative bandwidth of 8%.</p>\u0000 </div>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"68 10","pages":""},"PeriodicalIF":1.1,"publicationDate":"2026-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149146852","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