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Design of wideband bandpass frequency selective surface based on the patch resonators and substrate integrated waveguide cavities 基于贴片谐振器和基底集成波导腔的宽带带通频率选择表面设计
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-29 DOI: 10.1002/mop.34310
Qianwen Liu, Ying Zhou, Bo Li, Yun-peng Lyu
{"title":"Design of wideband bandpass frequency selective surface based on the patch resonators and substrate integrated waveguide cavities","authors":"Qianwen Liu,&nbsp;Ying Zhou,&nbsp;Bo Li,&nbsp;Yun-peng Lyu","doi":"10.1002/mop.34310","DOIUrl":"https://doi.org/10.1002/mop.34310","url":null,"abstract":"<p>In this paper, a new approach for the design of wideband bandpass frequency selective surface (FSS) is proposed based on the microstrip patch resonator and substrate integrated waveguide (SIW) cavity. Originating from the similarity of field distributions between the patch and SIW resonators, the patch resonator is concentrically embedded within the SIW cavity. In this context, resonant modes in both patch resonator and SIW cavity can be generated without enlarging the circuit size. Then, the slotlines are introduced to the ground layer to establish cross-couplings to produce transmission zeros (TZs) for better out-of-band performances. For demonstration, a fourth-order bandpass FSS is constructed, simulated, and fabricated. The measured results agree with the simulated ones, verifying that the proposed design method possesses attractive advantages of low profile, compact size, high frequency selectively, and nice universality.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 9","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100405","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
Metal-loaded slot antenna with flat gain and one-sided radiation 具有平坦增益和单面辐射的金属负载槽形天线
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-28 DOI: 10.1002/mop.34275
Peiyi Qiu, Jinghui Meng, Xiaoyu Yang, Haruichi Kanaya
{"title":"Metal-loaded slot antenna with flat gain and one-sided radiation","authors":"Peiyi Qiu,&nbsp;Jinghui Meng,&nbsp;Xiaoyu Yang,&nbsp;Haruichi Kanaya","doi":"10.1002/mop.34275","DOIUrl":"https://doi.org/10.1002/mop.34275","url":null,"abstract":"<p>A metal-loaded double-layer unidirectional radiation slot antenna with flat gain is proposed for millimeter-wave (mm-wave) operations. Our presented antenna is constituted of a slot antenna with metal vias, an inner floating metal, a metal line, and ground patch. With the help of inner metal excited by the coupling of the slot antenna, an additional resonance point around 26 GHz could be obtained and the antenna gain is enhanced. To verify the design, the antenna has been fabricated with the prepreg technology. The whole fabricated size is only 0.62 × 0.62<i>λ</i><sub>0</sub>² with a thickness of 0.057<i>λ</i><sub>0</sub> (<i>λ</i><sub>0</sub> is the free-space wavelength at 26 GHz). The measured impedance bandwidth is from 25.1 to 26.55 GHz. Moreover, the proposed antenna obtains a wide flat gain (5.78 ± 0.48 dBi) within the bandwidth and stable one-sided radiation patterns. The above characteristics show that the proposed antenna is a competitive choice for mm-wave systems.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142089824","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 high selectivity tunable bandpass filter with switchable single-/dual-band responses 设计具有可切换单/双波段响应的高选择性可调带通滤波器
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-28 DOI: 10.1002/mop.34306
Liangzu Cao, Shouzhan Li
{"title":"Design of high selectivity tunable bandpass filter with switchable single-/dual-band responses","authors":"Liangzu Cao,&nbsp;Shouzhan Li","doi":"10.1002/mop.34306","DOIUrl":"https://doi.org/10.1002/mop.34306","url":null,"abstract":"<p>This article proposes a switchable filter with four operating states, namely dual-band mode, lower band mode, upper band mode, and all-stop mode. The transition between these states is achieved by using positive intrinsic negative diodes, while the center frequency tuning is done by using varactors. In order to verify the design concept, a prototype has been fabricated on an F4BME substrate with a dielectric constant of 2.25 and a thickness of 1 mm, and the measured results were in agreement with the simulations. Notably, the dual-band mode yields four transmission zeros (TZs), while the single-band mode produces two TZs. The final circuit size of the designed filter is 0.18 × 0.14 λg, making it ideally suited for reconfigurable multi-band communication systems.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 9","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142100156","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
Development of tunable mid-infrared laser at 10–25 μm 开发 10-25 μm 波长的可调谐中红外激光器
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-27 DOI: 10.1002/mop.34299
Ke Wang, Lu Zhao, Kuan Li, Chao Niu, Chunting Wu, Yongji Yu
{"title":"Development of tunable mid-infrared laser at 10–25 μm","authors":"Ke Wang,&nbsp;Lu Zhao,&nbsp;Kuan Li,&nbsp;Chao Niu,&nbsp;Chunting Wu,&nbsp;Yongji Yu","doi":"10.1002/mop.34299","DOIUrl":"https://doi.org/10.1002/mop.34299","url":null,"abstract":"<p>Ten to 25 μm-long-wavelength mid-infrared laser has broad application prospects in fields such as military, industrial, medical, and spectroscopy. Currently, lasers capable of emitting 10–25 μm-long-wavelength mid-infrared radiation include CO<sub>2</sub> lasers, solid-state lasers, quantum cascade lasers, infrared supercontinuum light sources, and free electron lasers. This review summarizes the development status of these five types of lasers, providing a detailed analysis and summary of their operating principles, advantages, limitations, and future outlooks. The aim is to offer valuable reference information for related research and to promote the further development and application of tunable mid-infrared laser at 10–25 μm.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142077916","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
Compact multi-band eight-element MIMO antenna with decoupled antenna pairs for 5G mobile terminal applications 用于 5G 移动终端应用的带解耦天线对的紧凑型多频带八元件 MIMO 天线
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-26 DOI: 10.1002/mop.34300
Ke Li, Hanxin Geng, Jinge Guo, Jiale Fan, Yuchen Luan
{"title":"Compact multi-band eight-element MIMO antenna with decoupled antenna pairs for 5G mobile terminal applications","authors":"Ke Li,&nbsp;Hanxin Geng,&nbsp;Jinge Guo,&nbsp;Jiale Fan,&nbsp;Yuchen Luan","doi":"10.1002/mop.34300","DOIUrl":"https://doi.org/10.1002/mop.34300","url":null,"abstract":"<p>This paper presents a novel design method for a tri-band multiple in multiple out (MIMO) antenna. The antenna consists of four sets of identical antenna pairs arranged on the two side frames. Three resonant modes can be obtained using a microstrip coupling feed structure by employing different branches in antenna unit design. The working frequencies of the modes can be adjusted independently. Moreover, in each pair of antennas, two antenna units were closely arranged and a decoupling grounding branch was employed between the adjacent antennas to ensure good isolation. The tri-band eight-element MIMO antenna operates at 3.5, 4.9, and 5.6 GHz and the isolations were better than 14 dB. The proposed antenna had a low profile of 0.06<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <msub>\u0000 <mi>λ</mi>\u0000 \u0000 <mn>0</mn>\u0000 </msub>\u0000 </mrow>\u0000 <annotation> ${lambda }_{0}$</annotation>\u0000 </semantics></math> and good isolation so it has potential applications in 5G mobile terminals.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142077923","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
Eigenvector method for array pattern synthesis 阵列图案合成的特征向量法
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-24 DOI: 10.1002/mop.34302
Jie Chen, Yingzeng Yin
{"title":"Eigenvector method for array pattern synthesis","authors":"Jie Chen,&nbsp;Yingzeng Yin","doi":"10.1002/mop.34302","DOIUrl":"https://doi.org/10.1002/mop.34302","url":null,"abstract":"<p>A novel equation for array beam pattern synthesis is presented. The expected pattern total power is set to a fixed value, under this constraint, the difference between the main beam total power and the other part total power is maximized to achieve the array pattern synthesis. To solve the proposed pattern synthesis equation, which cannot be solved by any published traditional method, based on the Lagrange multiplier method, it is transformed into a new equation in which the array element excitation vector is the eigenvector of a matrix. Thus, the array element excitation vector can be obtained by matrix eigenvalue decomposition. Three array architectures using the method are taken as examples to show its advantages. Simulation results of the examples show that the method has better performance than other methods. The method is a noniterative approach, so it requires less computational volume to complete the pattern synthesis process. In addition, through eigenvalue decomposition, multiple eigenvectors can provide other different solutions of array elements current excitations, which can be applied in different areas.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050558","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 single-channel transmitarray antenna with abilities of super resolution and digital beamforming 具有超分辨率和数字波束成形能力的单通道发射阵列天线
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-24 DOI: 10.1002/mop.34304
Xin Guo, Jiayu Tang, Wen Wu
{"title":"A single-channel transmitarray antenna with abilities of super resolution and digital beamforming","authors":"Xin Guo,&nbsp;Jiayu Tang,&nbsp;Wen Wu","doi":"10.1002/mop.34304","DOIUrl":"https://doi.org/10.1002/mop.34304","url":null,"abstract":"<p>A single-channel transmitarray antenna with abilities of super resolution and digital beamforming (DBF) is proposed. The amplitude and phase distributions on the array aperture are reconstructed through beam switching with a single channel. By finding and solving relations between distributions and received signals of beams, aperture distributions can be reconstructed. The ill-conditioned problem caused by limited scanning range and angular interval is solved using the regularization method. The obtained distributions can then be delivered to super-resolution algorithm to obtain super resolution, or used to produce shaped beams by DBF. On the basis of the proposed theory, a bifocal beam-reconfigurable transmitarray is designed and tested as a single-channel DBF antenna without special and additional hardware design. It has the outstanding advantages of low cost, simple structure, low energy consumption, and high working frequency.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050559","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 wideband fully enclosed coaxial-to-substrate-integrated waveguide transition and its applications in a 1-to-4 radial power divider 宽带全封闭同轴到基底集成波导过渡及其在 1-4 径向功率分配器中的应用
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-24 DOI: 10.1002/mop.34290
Bo Tao, Jiong Liu, Linna Yang, Zihao Qing, Zhiyi Li
{"title":"A wideband fully enclosed coaxial-to-substrate-integrated waveguide transition and its applications in a 1-to-4 radial power divider","authors":"Bo Tao,&nbsp;Jiong Liu,&nbsp;Linna Yang,&nbsp;Zihao Qing,&nbsp;Zhiyi Li","doi":"10.1002/mop.34290","DOIUrl":"https://doi.org/10.1002/mop.34290","url":null,"abstract":"<p>Aimed at the interconnection between coaxial transmission line and substrate-integrated waveguide (SIW), a wideband coaxial-to-SIW transition was proposed and applied in a 1-to-4 radial power divider. First of all, a fan-shaped region was designed on the end of a SIW transmission line. Then, a coaxial transmission line was inserted into this region. To improve the impedance matching at the coaxial port, a feeding ring was designed on the back of the transition where the coaxial line was inserted. Next, the transition was applied in a 1-to-4 radial power divider to realize an equal power division. Finally, to validate the correctness of the designs, prototypes were fabricated and measured. For the coaxial-to-SIW transition, measured reflection coefficient |S<sub>11</sub>| was less than −15 dB from 7.84 to 12.18 GHz. Transmission coefficient |S<sub>21</sub>| was between −0.52 and −0.24 dB. For the 1-to-4 radial divider, measured |S<sub>11</sub>| was less than −15 dB from 7.91 to 12.4 GHz, and the transmission coefficient was around −6.9 dB. Measurement and simulation agreed well with each other. Therefore, the proposed design can be used in coaxial-to-SIW interconnection scenarios.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050561","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
Detection of defects in composite insulators based on laser-induced plasma combined with machine learning 基于激光诱导等离子体和机器学习的复合绝缘体缺陷检测
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-24 DOI: 10.1002/mop.34298
Shuaiqi Xu, Changjin Che
{"title":"Detection of defects in composite insulators based on laser-induced plasma combined with machine learning","authors":"Shuaiqi Xu,&nbsp;Changjin Che","doi":"10.1002/mop.34298","DOIUrl":"https://doi.org/10.1002/mop.34298","url":null,"abstract":"<p>Due to Prolonged operation and external environmental factors, composite insulators may develop various defects, which can potentially lead to serious accidents in power systems. Detecting and analyzing these defects is critically important. In this study, we combine machine learning with laser-induced breakdown spectroscopy (LIBS) to identify defects in composite insulators and obtain spectral data from both defective and nondefective samples. The Uniform Manifold Approximation and Projection algorithm was employed to reduce the dimensionality of the data, thereby enhancing detection accuracy and efficiency. Decision tree, random forest (RF), K-nearest neighbor, and support vector machine algorithms were used to classify the dimensionality-reduced data. The results indicate that the RF algorithm achieved the best classification performance, with accuracies of 100% and 95.46% for the training and test sets, respectively. Furthermore, the precision, recall, and F1 scores, which reflect model performance, also showed superior results with the RF algorithm. These findings suggest that the combination of LIBS technology and machine learning can rapidly and accurately detect and analyze defects in composite insulators, offering new insights and methods for defect detection in composite insulators.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050560","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 laser tuning by means of nonthermal plasma as a temperature regulator 利用非热等离子体作为温度调节器进行光纤激光器调谐
IF 1 4区 工程技术
Microwave and Optical Technology Letters Pub Date : 2024-08-24 DOI: 10.1002/mop.34297
Hao Jiun Tung, Raja Kamarulzaman Raja Ibrahim, Asrul Izam Azmi, Nor Ain Husein, Everardo Vargas-Rodriguez, Mohammed Thamer Alresheedi, Eng Khoon Ng, Mohd Adzir Mahdi
{"title":"Fiber laser tuning by means of nonthermal plasma as a temperature regulator","authors":"Hao Jiun Tung,&nbsp;Raja Kamarulzaman Raja Ibrahim,&nbsp;Asrul Izam Azmi,&nbsp;Nor Ain Husein,&nbsp;Everardo Vargas-Rodriguez,&nbsp;Mohammed Thamer Alresheedi,&nbsp;Eng Khoon Ng,&nbsp;Mohd Adzir Mahdi","doi":"10.1002/mop.34297","DOIUrl":"https://doi.org/10.1002/mop.34297","url":null,"abstract":"<p>This work presents a technique to obtain wavelength tuning for a fiber laser with a nonthermal plasma<b>-</b>based temperature regulator system and a fiber Bragg grating (FBG). The plasma effect was generated in a dielectric barrier discharge (DBD) reactor filled with helium as the carrier gas for plasma generation. The temperature characterization of the DBD reactor had shown that the nonthermal heating mechanism of plasma could manipulate gas temperature from 25°C to around 145°C in ~10 min. By exploiting the rapid temperature change of plasma, the reflected wavelength of the FBG can be tuned accordingly. At a discharge voltage of 3 kV, the fiber laser was tuned within a range of 2 nm with 11.9 pm/°C tuning resolution. The fiber laser exhibits a thermally stable emission with very low shifting at a constant temperature value.</p>","PeriodicalId":18562,"journal":{"name":"Microwave and Optical Technology Letters","volume":"66 8","pages":""},"PeriodicalIF":1.0,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142050562","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
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