International Journal of Antennas and Propagation最新文献_第10页

A Computationally Efficient Estimator for the Target Angle, Delay, and Doppler Parameters in Passive Radar 一种计算效率高的无源雷达目标角、时延和多普勒参数估计方法

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-07-18 DOI: 10.1155/2023/5551000

Jing Yang, Chengcheng Liu, Jie Huang, Dapeng Liu, Ting Ding, Jian-dong Zhu, Xia Li

{"title":"A Computationally Efficient Estimator for the Target Angle, Delay, and Doppler Parameters in Passive Radar","authors":"Jing Yang, Chengcheng Liu, Jie Huang, Dapeng Liu, Ting Ding, Jian-dong Zhu, Xia Li","doi":"10.1155/2023/5551000","DOIUrl":"https://doi.org/10.1155/2023/5551000","url":null,"abstract":"The azimuth, elevation, time delay (TD), and Doppler shift (DS) of the target echo signal are important parameters for target localization in passive radar. In this paper, for the problem of joint estimation of target azimuth, elevation, TD, and DS parameters in passive radar, a computationally efficient estimator is proposed based on segmented coherent integration and uniform circular array (UCA) interferometer direction finding. First, according to the parameters of the target motion and illuminators of opportunity, the reference and surveillance signals are divided into segments, with fast time within a segment and slow time across the segments; then, matching filtering along the fast time and fast Fourier transform (FFT) along the slow time are performed to accumulate the target echo energy to the same delay-Doppler cell; finally, the UCA interferometer two-dimensional direction finding is performed at the delay-Doppler cell where the target echo is located, to achieve the target azimuth and elevation estimate. Simulation results demonstrate that the proposed algorithm has low computational complexity, high real-time processing capability, and can achieve efficient and real-time estimation of the azimuth, elevation, TD, and DS parameters of weak target echoes in passive radar.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46830203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","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 Miniaturized FSS with High Angular Stability Utilizing a Novel Closed Loop 基于新型闭环的高角稳定性小型化FSS设计

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-07-12 DOI: 10.1155/2023/8894404

Wei Li, Fengshuo Zhang, Ying Suo, Zhe Jiang, Jinghui Qiu

{"title":"Design of Miniaturized FSS with High Angular Stability Utilizing a Novel Closed Loop","authors":"Wei Li, Fengshuo Zhang, Ying Suo, Zhe Jiang, Jinghui Qiu","doi":"10.1155/2023/8894404","DOIUrl":"https://doi.org/10.1155/2023/8894404","url":null,"abstract":"In this paper, we propose a miniaturized 2.5-dimensional (2.5D) frequency selective surface (FSS) structure with high angular stability. A novel closed-loop FSS is formed by combining the Jerusalem cross (JC) structure with the conventional rectangular closed loop using vias. This approach further enhances the coupling performance of the FSS and thus achieves miniaturized design. The unit cell size of the proposed FSS is 0.019λ0 × 0.019λ0 at the resonant frequency, and the metal is printed on a dielectric substrate with a thickness of 0.003λ0. The proposed FSS has a resonant frequency of 850 MHz and exhibits band-stop characteristics. It is insensitive to the incident angle with a good operating performance in both the TE and TM wave modes. Therefore, it can be well used as an electromagnetic shield for the GSM 850 band. In order to facilitate the rapid analysis and design of the FSS, the equivalent circuit model is further analyzed and established, and values of the corresponding lumped components are derived. In addition, a prototype FSS is fabricated using printed circuit board technology and is tested in a microwave anechoic chamber. The full-wave analysis simulation, equivalent circuit model simulation, and practical measurement results reflect a high level of consistency.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42760303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","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 an Enhanced Isolation 8-Unit MIMO Antenna for Smartphones Operating in 5G nR and LTE 42 Bands 用于5G nR和LTE 42频段智能手机的增强型隔离8单元MIMO天线设计

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-06-30 DOI: 10.1155/2023/7157515

Zhiwei Song, Hongxiang Miao, Xiaoming Xu, Lu Wang

{"title":"Design of an Enhanced Isolation 8-Unit MIMO Antenna for Smartphones Operating in 5G nR and LTE 42 Bands","authors":"Zhiwei Song, Hongxiang Miao, Xiaoming Xu, Lu Wang","doi":"10.1155/2023/7157515","DOIUrl":"https://doi.org/10.1155/2023/7157515","url":null,"abstract":"A miniaturized enhanced isolation 8-unit MIMO antenna for smartphones is proposed in this paper. The units are planar inverted-F antennas with the same structure, and we use the slotting method and shorted probe to miniaturize them. The size of every unit is 14 × 6 mm2 (0.149 × 0.064λ2). We insert an L-shaped decoupling element into the middle of adjacent radiating elements and connect the decoupling element to the GND. Note that the decoupling elements are on the outer side of the substrate, and the radiating elements are on the inner side of the substrate. Finally, a prototype is fabricated and measured. The measured results show that the bandwidth of the MIMO antenna is from 3.0 GHz to 5.3 GHz (55.4%), which fully supports the n77, n78, and n79 in the 5G nR frequency band and the 4G LTE 42 frequency band (S11 less than −6 dB). The measured isolation of the MIMO antenna is greater than 25 dB by using the decoupling method in this paper. The envelope correlation coefficient of the proposed MIMO antenna is less than 0.08, its radiation efficiency is greater than 50%, and its gain is between 4.2 and 5.3 dBi in the whole operating frequency band.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44139494","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Independently Tunable Triband Patch Antenna with Band-Notched Characteristics for X-Band Applications 用于x波段应用的带陷波特性独立可调谐三带贴片天线

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-06-15 DOI: 10.1155/2023/1395473

Thi Kieu Nga Le, Fabian Schwartau, Sebastian Paul, D. T. Phan, P. Soh, J. Schoebel

{"title":"Independently Tunable Triband Patch Antenna with Band-Notched Characteristics for X-Band Applications","authors":"Thi Kieu Nga Le, Fabian Schwartau, Sebastian Paul, D. T. Phan, P. Soh, J. Schoebel","doi":"10.1155/2023/1395473","DOIUrl":"https://doi.org/10.1155/2023/1395473","url":null,"abstract":"This paper presents a triband antenna with a simple design for X-band applications. The proposed antenna is designed based on a patch with a truncated corner slot and complementary split-ring resonators in the ground plane. In this way, the antenna exhibits three operating bands and its resonant frequencies can be controlled independently by changing dimensions of the slot in the patch and the resonator structures in the ground plane. In addition, due to the antiresonant behavior of the complementary split-ring resonator structures, the antenna exhibits a notch-band characteristic at 10.7 GHz. A parametric study is performed to provide a detailed understanding of the independent resonance tuning behavior of the antenna. Both simulated and measured results of the proposed antenna are presented, which are in good agreement. The proposed antenna shows three operating bands in the X-band including (with absolute and relative bandwidths) 9.4–9.7 GHz (300 MHz, 3.14%), 10.3–10.6 GHz (300 MHz, 2.86%), and 11.05–11.32 GHz (297 MHz, 2.66%). In addition to that, a notched band of 10.6–11.05 GHz is introduced to exclude operation in the frequency bands of radiometric observation systems (10.6–10.7 GHz). To the best of our knowledge, this work is unique in its combination of independent tuning of three frequency bands of operation with single-layer implementation in the X-band. Such a structure provides additional degrees of freedom to the antenna design, customizing operation in the required bands while avoiding operation in other bands.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43377949","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Parametric Model for Coaxial Cavity Filter with Combined KCCA and MLSSVR KCCA和MLSVR组合同轴腔滤波器的参数模型

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-06-07 DOI: 10.1155/2023/2024720

Shengbiao Wu, Huaning Li, Xianpeng Chen

{"title":"Parametric Model for Coaxial Cavity Filter with Combined KCCA and MLSSVR","authors":"Shengbiao Wu, Huaning Li, Xianpeng Chen","doi":"10.1155/2023/2024720","DOIUrl":"https://doi.org/10.1155/2023/2024720","url":null,"abstract":"Aiming at the problems of poor data effectiveness, low modeling accuracy, and weak generalization in the tuning process of microwave cavity filters, a parametric model for coaxial cavity filter using kernel canonical correlation analysis (KCCA) and multioutput least squares support vector regression (MLSSVR) is proposed in this study. First, the low-dimensional tuning data is mapped to the high-dimensional feature space by kernel canonical correlation analysis, and the nonlinear feature vectors are fused by the kernel function; second, the multioutput least squares support vector regression algorithm is used for parametric modeling to solve the problems of low accuracy and poor prediction performance; third, the support vector of the parameter model is optimized by the differential evolution whale algorithm (DWA) to improve the convergence and generalization ability of the model in actual tuning. Finally, the tuning experiments of two cavity filters with different topologies are carried out. The experimental results show that the proposed method has an obvious improvement in generalization performance and prediction accuracy compared with the traditional methods.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-06-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43451095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Low Cross-Polarization Microstrip Antenna Array for Millimeter Wave Applications 用于毫米波应用的低交叉极化微带天线阵列

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-06-06 DOI: 10.1155/2023/7622014

Yanzhi Fu, Yixiang Lin, Changda Shi

引用次数: 1

A Car Logo Design-Inspired CPW-Fed Semitransparent Antenna for Vehicular Applications 一种以汽车标志设计为灵感的CPW-Fed车载半透明天线

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-05-27 DOI: 10.1155/2023/7101049

Lekha Kannappan, S. Palaniswamy, M. Kanagasabai, Sachin Kumar

{"title":"A Car Logo Design-Inspired CPW-Fed Semitransparent Antenna for Vehicular Applications","authors":"Lekha Kannappan, S. Palaniswamy, M. Kanagasabai, Sachin Kumar","doi":"10.1155/2023/7101049","DOIUrl":"https://doi.org/10.1155/2023/7101049","url":null,"abstract":"In this paper, a quad-port multiple-input multiple-output (MIMO) semitransparent antenna is designed for automotive applications. The transparent soda lime glass substrate is used in the prototype antenna for windshield applications, and the radiator is nontransparent copper metal. The unit cell radiator of the MIMO antenna is similar to the “NISSAN automobile-like” logo. The proposed MIMO antenna has a −10 dB impedance bandwidth of 3.4 to 11 GHz. The edge-to-edge distance between the elements in the MIMO configuration is 6 mm. The antenna elements are perpendicularly oriented to offer dual (horizontal and vertical) polarization, which aids in providing better isolation and good signal reception in all directions. The isolation between the resonating elements is greater than 15 dB without the use of any decoupling structure. The diversity metrics are examined in order to gain a better understanding of the MIMO antenna performance. The envelope correlation coefficient (ECC) is less than 0.01, diversity gain (DG) is greater than 9.98 dB, and the total active reflection coefficient (TARC) and channel capacity loss (CCL) are less than −10 dB and 0.07 bits/s/Hz, respectively. The quad-port MIMO antenna offers transparency of 52.26% over the entire area. The proposed antenna could be suitable for automotive applications such as intelligent transportation systems (ITS), vehicular communications, and the automatic vehicle identifier (AVI).","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48162031","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shaped Omnidirectional Reflector Fed by a Dielectric Lens Associated with a Coaxial Feed Horn 由与同轴馈电喇叭相连接的介质透镜馈电的形状全向反射器

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-05-23 DOI: 10.1155/2023/2729945

J. Bergmann, L. S. Patinos

引用次数: 0

A Ku Wideband Circularly Polarized Microstrip Antenna Array with Low Profile Crossed-Dipole Element 一种低轮廓交叉偶极元的Ku宽带圆极化微带天线阵列

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-05-19 DOI: 10.1155/2023/6645672

Haipeng Liu, Yunhua Zhang, Xiaowen Zhao

{"title":"A Ku Wideband Circularly Polarized Microstrip Antenna Array with Low Profile Crossed-Dipole Element","authors":"Haipeng Liu, Yunhua Zhang, Xiaowen Zhao","doi":"10.1155/2023/6645672","DOIUrl":"https://doi.org/10.1155/2023/6645672","url":null,"abstract":"This paper presents a novel Ku wideband circularly polarized (CP) antenna array composed of crossed-dipole element (CDE) and fed through sequential rotation (SR) feeding technique. Unlike the traditional CP-CDE fed by coaxial cable that usually works at low frequencies, the proposed CDE consists of two orthogonal heart-shaped patch dipoles that can work at frequencies as high as Ku-band, at the same time achieving a larger bandwidth. A feeding structure is proposed without welding, so potential errors in the antenna assembly process can be mitigated. A 2 × 2 CP antenna array with wideband SR feeding network is designed based on the CDE to further expand the axial ratio (AR) bandwidth. The designed antenna array is fabricated using the multilayer printed circuit board (PCB) technology and measured in anechoic chamber using the planar near-field measurement facility. The measured results show that −10 dB impedance bandwidth of 44% (11.6–18.15 GHz) along with 3 dB AR bandwidth of 38.7% (12–17.65 GHz) and 3 dB gain bandwidth of 34.6% (12.2–17.3 GHz) as well as 11.02 dBic peak gain have been achieved while maintaining a lower profile.","PeriodicalId":54392,"journal":{"name":"International Journal of Antennas and Propagation","volume":" ","pages":""},"PeriodicalIF":1.5,"publicationDate":"2023-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47463273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis of Sparse Uniformly Excited Concentric Ring Arrays Using the Chaos Sparrow Search Algorithm 利用混沌麻雀搜索算法合成稀疏均匀激励同心环阵列

IF 1.5 4区计算机科学

International Journal of Antennas and Propagation Pub Date : 2023-05-16 DOI: 10.1155/2023/2926111

Bin Wang, Xue Tian, Kui Tao

引用次数: 0