International Journal of Microwave and Wireless Technologies最新文献

A fast phase calibration method for a liquid crystal microwave phased array antenna assisted by neural network 神经网络辅助液晶微波相控阵天线的快速相位校准方法

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-08-13 DOI: 10.1017/s175907872400014x

Qianying Yan, Yanwei Huang, Wenzhao Zhang, Xin Hou, Mengqing Zhang, Xiangru Wang, Feng Liang

{"title":"A fast phase calibration method for a liquid crystal microwave phased array antenna assisted by neural network","authors":"Qianying Yan, Yanwei Huang, Wenzhao Zhang, Xin Hou, Mengqing Zhang, Xiangru Wang, Feng Liang","doi":"10.1017/s175907872400014x","DOIUrl":"https://doi.org/10.1017/s175907872400014x","url":null,"abstract":"Liquid crystal microwave phased arrays (LC-MPAs) are regarded as an ideal approach to realize compact antennas owing to their advantages in cost, size, weight, and power consumption. However, the shortcoming in low radiation deflection efficiency has been one of LC-MPAs’ main application limitations. To optimize the steering performance of LC-MPAs, it is essential to model the channel imperfections and compensate for the phase errors. In this paper, a phase error estimation model is built by training a neural network to establish a nonlinear relationship between the near-field phase error and the far-field pattern, hence realizing fast calibration for LC-MPAs within several measured patterns. Simulations and experiments on a 64-channel, two-dimensional planar antenna were conducted to validate this method. The results show that this method offers precise phase error estimations of 3.58° on average, realizes a fast calibration process with several field-measured radiation patterns, and improves the performances of the LC-MPA by approximately 4%–10% in deflection efficiency at different steering angles.","PeriodicalId":49052,"journal":{"name":"International Journal of Microwave and Wireless Technologies","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142209955","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

Air-filled substrate integrated waveguide bandpass filter based on miniaturized non-resonant node structure 基于小型化非谐振节点结构的空气填充基底集成波导带通滤波器

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-07-02 DOI: 10.1017/s1759078724000084

Yunlong Li, Changjun Tian, Shaozhuo Li, Peng Chen, Yun Li, Kai Yang

引用次数: 0

Design of a broadband high-efficiency power amplifier based on a rectangular double transmission line structure 设计基于矩形双传输线结构的宽带高效功率放大器

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-07-02 DOI: 10.1017/s1759078724000606

Luyu Zhang, Zhiwei Zhang, Chenlu Wang, Chao Gu

引用次数: 0

Design of a broadband high-efficiency power amplifier based on ring-resonant filter with compensation architecture and a series of continuous modes 基于带补偿结构和一系列连续模式的环谐振滤波器的宽带高效功率放大器设计

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-30 DOI: 10.1017/s1759078724000539

Sen Xu, JianFeng Wu, Xiang Chen

引用次数: 0

A broadband metasurface antenna with multimode resonance 具有多模谐振的宽带元面天线

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-30 DOI: 10.1017/s1759078724000588

Hui Pang, Jianping Zhao, Juan Xu

引用次数: 0

Circularly polarized dual-port MIMO DRA for future Wi-Fi 6E applications 用于未来 Wi-Fi 6E 应用的圆极化双端口 MIMO DRA

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-30 DOI: 10.1017/s1759078724000576

Javed Iqbal, Usman Illahi, Shahid Mahmood Ramay, Mohamad Ismail Sulaiman

{"title":"Circularly polarized dual-port MIMO DRA for future Wi-Fi 6E applications","authors":"Javed Iqbal, Usman Illahi, Shahid Mahmood Ramay, Mohamad Ismail Sulaiman","doi":"10.1017/s1759078724000576","DOIUrl":"https://doi.org/10.1017/s1759078724000576","url":null,"abstract":"This research article proposes a dual-sense dual-port wideband circularly polarized (CP) multi-input multi-output (MIMO) antenna designed for Wi-Fi 6E applications. The main novelty lies in achieving CP for both ports using a truncated rectangular-shaped aperture. By incorporating design and spatial diversity and defective ground structure between the two radiators, the design improves isolation and enables the antenna to generate Left-Hand Circular Polarization (LHCP)depending on the selected feed port. The proposed MIMO rectangular dielectric resonator antenna demonstrates an impressive impedance-matching bandwidth (IBW)from 5.5 to 8.0 GHz (37.10%) as well as an axial ratio bandwidth (ARBW) covering from 6.0 to 6.55 GHz (12.20%). Additionally, the dual-port wideband CP MIMO antenna exhibits satisfactory diversity performance parameters. To validate the simulated results, a physical prototype is fabricated and subjected to experimental testing. The measured outcomes of the fabricated model align closely with the simulated results, confirming the accuracy of the design. With both MIMO and CP capabilities and improved isolation, this proposed model proves beneficial in reducing latency and minimizing the impact of multipath fading. Therefore, it stands as an excellent choice for future devices utilizing the Wi-Fi 6E band due to its broad IBW and overlappingAR.","PeriodicalId":49052,"journal":{"name":"International Journal of Microwave and Wireless Technologies","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141198348","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

On the effects of struts diameter and shape on the European Space Agency deep space antenna directivity and first side lobe 支杆直径和形状对欧洲航天局深空天线指向性和第一侧叶的影响

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-30 DOI: 10.1017/s1759078724000527

Davide Arenare, Fabio Pelorossi, Filippo Concaro, Marco Pasian

引用次数: 0

Ultrahigh frequency path loss prediction based on K-nearest neighbors 基于 K 最近邻的超高频路径损耗预测

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-22 DOI: 10.1017/s1759078724000370

Mamta Tikaria, Vineeta Saxena Nigam

{"title":"Ultrahigh frequency path loss prediction based on K-nearest neighbors","authors":"Mamta Tikaria, Vineeta Saxena Nigam","doi":"10.1017/s1759078724000370","DOIUrl":"https://doi.org/10.1017/s1759078724000370","url":null,"abstract":"\u0000 Path loss prediction (PLP) is an important feature of wireless communications because it allows a receiver to anticipate the signal strength that will be received from a transmitter at a given distance. The PLP is done by using machine learning models that take into account numerous aspects such as the frequency of the signal, the surroundings, and the type of antenna. Various machine learning methods are used to anticipate path loss propagation but it is difficult to predict path loss in unknown propagation conditions. In existing models rely on incomplete or outdated data, which can affect the accuracy and reliability of predictions and they do not take into account the effects of environmental factors, such as terrain, foliage, and weather conditions, on path loss. Furthermore, existing models are not robust enough to handle the real-world variability and uncertainty, leading to significant errors in predictions. To tackle this issue, a novel ultrahigh frequency (UHF) PLP based on K-nearest neighbors (KNNs) is developed for predicting and optimizing the path loss for UHF. In this proposed model, a KNN-based PLP has been used to predict the path loss in the UHF. This technique is used for high-accuracy PLP through KNN forecast route loss by determining the K-nearest data points to a particular test point based on a distance metric. Moreover, the existing models were not able to optimize path loss due to complex and large-scale machine learning models. Therefore, the stochastic gradient descent technique has been used to minimize the objective function, which is often a measure of the difference between the model’s predictions and the actual output that will fine-tune the parameters of the KNN model, by measuring the similarity between data points. This model is implemented using Python to make it a lot more convenient.","PeriodicalId":49052,"journal":{"name":"International Journal of Microwave and Wireless Technologies","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141108877","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 TE-polarized resonant Bessel-beam launchers for wireless power transfer links in the radiative near-field region 设计用于辐射近场区无线电力传输链路的 TE 偏振谐振贝塞尔波束发射器

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-20 DOI: 10.1017/s1759078723001538

E. Negri, F. Benassi, W. Fuscaldo, D. Masotti, P. Burghignoli, A. Costanzo, Alessandro Galli

{"title":"Design of TE-polarized resonant Bessel-beam launchers for wireless power transfer links in the radiative near-field region","authors":"E. Negri, F. Benassi, W. Fuscaldo, D. Masotti, P. Burghignoli, A. Costanzo, Alessandro Galli","doi":"10.1017/s1759078723001538","DOIUrl":"https://doi.org/10.1017/s1759078723001538","url":null,"abstract":"\u0000 Resonant Bessel-beam launchers (BBLs)are radiating devices constituted by a cylindrical metallic cavity with a partially reflecting sheet (PRS) on top. Millimeter-wave resonant BBLs typically exhibit transverse magnetic (TM) polarization due to the use of coaxial probes as feeders and homogenized metasurfaces as PRS. Launchers showing either a purely transverse electric (TE) or a hybrid (quasi-TE) polarization have recently been proposed for realizing wireless power transfer (WPT) links in the radiative near-field region at millimeter waves. The former are obtained by means of a radial slot array as a feeder and a homogenized metasurface as a PRS. The latter are obtained by using a loop antenna as a feeder and an annular strip grating in the homogenization limit as radiating aperture. In this work, based on an original semi-analytical model, such a metasurface is demonstrated to show a dichroic behavior. This interpretation explains the improvement in terms of polarization purity with respect to more nondichroic conventional homogenized metasurfaces. The behavior of the annular strip grating under a pure TM polarization is tested with a coaxial feeder, whereas its behavior under a pure TE polarization is tested by means of the radial slot array feeder. Results confirm the validity of the proposed analysis, which is finally exploited to evaluate the WPT performance.","PeriodicalId":49052,"journal":{"name":"International Journal of Microwave and Wireless Technologies","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2024-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141120673","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

An ultra-wideband power amplifier designed through a bandwidth expansion strategy 通过带宽扩展策略设计的超宽带功率放大器

IF 1.4 4区计算机科学

International Journal of Microwave and Wireless Technologies Pub Date : 2024-05-13 DOI: 10.1017/s1759078724000552

Xuefei Xuan, Zhiqun Cheng, Brendan Hayes, Zhiwei Zhang, Tingwei Gong, Shenbing Wu, Chao Le

引用次数: 0