Iet Microwaves Antennas & Propagation最新文献_第4页

A novel millimetre-wave 2D wide-angle scanning phased array antenna based on decoupling surface 基于去耦表面的新型毫米波二维广角扫描相控阵天线

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-20 DOI: 10.1049/mia2.12521

Bao Xiong, Yongzhong Zhu, Yunxue Xu, Wenxuan Xie, Leng Han

引用次数: 0

An ultra-thin switched state active frequency selective surface absorber with wide bandwidth using semi-analytical method

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-16 DOI: 10.1049/mia2.12511

Z. A. Pandit Jibran, Kumud R. Jha, Satish K. Sharma, Anuj Shukla

{"title":"An ultra-thin switched state active frequency selective surface absorber with wide bandwidth using semi-analytical method","authors":"Z. A. Pandit Jibran, Kumud R. Jha, Satish K. Sharma, Anuj Shukla","doi":"10.1049/mia2.12511","DOIUrl":"https://doi.org/10.1049/mia2.12511","url":null,"abstract":"Using low-voltage forward biased PIN diodes, an ultrathin switched states active frequency selective surface based microwave absorber is designed. Using a semi-analytical method, the NXP#BAP70-03 PIN diode-based single polarised unit-cell of the active FSS absorber is rigorously analysed and its equivalent circuit model is developed. The unit-cell of the structure is selected as such to increase the envelope of the operating bandwidth and thus a total measured operating bandwidth extending from 1.70 to 11.36 GHz with reflectivity ≤−10 dB and the fractional bandwidth of 148.4% is achieved. This envelope also contains a 21.05% minimum, and 94.76% maximum fractional bandwidths corresponding to their resonance frequencies. It has been achieved by the absorber with the unit-cell size of 0.113λL × 0.113λL × 0.048λL where λL is the wavelength corresponding to the lowest operating frequency. The structure has been fabricated and experimentally verified for the normal and the angular incidences of the electromagnetic wave up to 30°. An exhaustive state-of-art comparison has also been made to demonstrate the novelty of the proposed work. Due to its low thickness of 0.048λL, and wide envelope of the operating bandwidth; it is a potential candidate for a smart stealth system, electromagnetic camouflage, and adaptive radar absorbing materials.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 12","pages":"944-956"},"PeriodicalIF":1.1,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12511","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143252794","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Classification with electromagnetic waves

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-14 DOI: 10.1049/mia2.12522

Ergun Simsek, Harish Reddy Manyam

{"title":"Classification with electromagnetic waves","authors":"Ergun Simsek, Harish Reddy Manyam","doi":"10.1049/mia2.12522","DOIUrl":"https://doi.org/10.1049/mia2.12522","url":null,"abstract":"The integration of neural networks and machine learning techniques has ushered in a revolution in various fields, including electromagnetic inversion, geophysical exploration, and microwave imaging. While these techniques have significantly improved image reconstruction and the resolution of complex inverse scattering problems, this paper explores a different question: Can near-field electromagnetic waves be harnessed for object classification? To answer this question, we first create a dataset based on the MNIST dataset, where we transform the grayscale pixel values into relative electrical permittivity values to form scatterers and calculate the electromagnetic waves scattered from these objects using a 2D electromagnetic finite-difference frequency-domain solver. Then, we train various machine learning models with this dataset to classify the objects. When we compare the classification accuracy and efficiency of these models, we observe that the neural networks outperform others, achieving a 90% classification accuracy solely from the data without a need for projecting the input data into a latent space. The impacts of the training dataset size, the number of antennas, and the location of antennas on the accuracy and time spent during training are also investigated. These results demonstrate the potential for classifying objects with near-field electromagnetic waves in a simple setup and lay the groundwork for further research in this exciting direction.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 12","pages":"898-910"},"PeriodicalIF":1.1,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12522","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143252614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A reconfigurable transmitarray unit cell employing liquid metal

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-12 DOI: 10.1049/mia2.12518

Zhishu Qu, Yihua Zhou, James R. Kelly, Zhengpeng Wang, Kenneth Lee Ford, Yue Gao

{"title":"A reconfigurable transmitarray unit cell employing liquid metal","authors":"Zhishu Qu, Yihua Zhou, James R. Kelly, Zhengpeng Wang, Kenneth Lee Ford, Yue Gao","doi":"10.1049/mia2.12518","DOIUrl":"https://doi.org/10.1049/mia2.12518","url":null,"abstract":"<div>\u0000 \u0000 \u0000 <section>\u0000 \u0000 In this paper, a reconfigurable transmitarray unit cell using liquid metal is presented. It consists of three conducting layers where the geometries of the resonators, on the different layers, differ and consist of an arrow shape together with rotated split rings. The arrow-shaped conducting layer has the capability to convert the polarization of the incoming waves by 90°. The split ring resonators, on the upper and lower conducting layers, have the same dimensions but different orientations (horizontal and vertical polarization). Several fluidic channels are placed beneath/above the conducting layers. The transmission behaviour of the unit cell can be changed by altering the geometrical parameters which is achieved by injecting the liquid metal into the channels. More than 300° phase shift range with a maximum S21 of ∼ −1.5 dB at 3.3 GHz is obtained. It exhibits 3 dB of insertion loss over a bandwidth ranging from 3.2 to 3.43 GHz. It is the first time that a transmitarray unit cell, reconfigured employing liquid metal, provides a combination of low insertion loss and large phase shift range. The proposed prototype was fabricated and measured within an open-ended waveguide and the measured results agree well with the simulations and verify the effectiveness of the design. The reconfigurable transmitarray unit cell can be used to design beam-scanning arrays, as well as for applications in wireless communications.\u0000 </section>\u0000 </div>","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 12","pages":"985-991"},"PeriodicalIF":1.1,"publicationDate":"2024-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12518","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143252516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Development of a compact metasurface antenna with reconfigurable pattern through mode combination technique for 5G mm-wave applications

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-10 DOI: 10.1049/mia2.12515

Hamed Hamlbar Gerami, Robab Kazemi

{"title":"Development of a compact metasurface antenna with reconfigurable pattern through mode combination technique for 5G mm-wave applications","authors":"Hamed Hamlbar Gerami, Robab Kazemi","doi":"10.1049/mia2.12515","DOIUrl":"https://doi.org/10.1049/mia2.12515","url":null,"abstract":"This paper presents a compact metasurface antenna with reconfigurable radiation patterns designed for 5G mm-wave applications. The antenna consists of a metasurface with 3 × 3 unit cells of modified patches, two coupling slots on the ground plane, and a reconfigurable feeding network. The method of characteristic mode analysis is initially employed to identify the modes of the metasurface layer which are responsible for steering the radiation pattern of the antenna at angles of 0° and ±30°. By analysing the surface currents of these modes, the locations of the coupling slots are determined, making it easier to excite and combine the desired modes and steer the main beam of the antenna in specific directions. The pattern reconfigurability is achieved by switching PIN diodes in the microstrip feed network to excite the appropriate coupling slots. The proposed metasurface antenna, with dimensions of 0.9λ0 × 0.9λ0 × 0.08λ0 (where λ0 is the free space wavelength at the centre frequency of 27 GHz), was fabricated and tested. The experimental results showed a wide bandwidth of 22.71% achieved by combining the resonance frequencies of the slots and metasurface layer. Furthermore, the antenna exhibits three distinct main beams at +30°, 0°, and −30° with a peak gain of 8.95 dB.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 12","pages":"885-897"},"PeriodicalIF":1.1,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12515","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143252440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wideband patch antenna through introducing co-plane terminal

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-07 DOI: 10.1049/mia2.12520

Boyu Sima, Zhengkun Guo, Run Liu, Heling Gong, Qingqing Yang, Jun Hu, Zhiwei Sun, Wen Wu

{"title":"Wideband patch antenna through introducing co-plane terminal","authors":"Boyu Sima, Zhengkun Guo, Run Liu, Heling Gong, Qingqing Yang, Jun Hu, Zhiwei Sun, Wen Wu","doi":"10.1049/mia2.12520","DOIUrl":"https://doi.org/10.1049/mia2.12520","url":null,"abstract":"Wideband operation is a crucial topic in patch structure research. Various wideband methods have been developed for patch antennas. However, some of the key benefits of patch antennas, such as semi-space radiation and easy fabrication, are degraded. In this study, we refer to the planar inverted-F antenna (PIFA) and propose a co-plane terminal loading strategy, resulting in an antenna model termed the co-plane terminal loaded antenna (CTLA). It transforms the dipole-to-background metallic via in PIFA to a dipole-to-feed gap in CTLA. Because the gap is a coupling connection, the impedance-match and resonant-frequency performance improve, resulting in a wider bandwidth. Based on the proposed approach, three CTLAs, including an original CTLA, an improved CTLA, and a multi-path CTLA, were constructed and simulated, with relative bandwidths of 63.5%, 55%, and 62%, respectively. The radiation pattern is typically patch-like, radiating in semi-space, and hybrid polarisation over the working band. Finally, the improved and multi-path CTLAs are fabricated and measured to validate this method and ensure that the results are consistent with the simulation results accurately. This study proposes a terminal-loading method for patch structures, which results in wideband radiation. It can be used in wideband phased arrays, communication systems etc.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 12","pages":"1001-1010"},"PeriodicalIF":1.1,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12520","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of bandwidth enhancement circular polarisation microstrip antenna loaded with sunflower-shaped metasurface

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-03 DOI: 10.1049/mia2.12519

Xiumei Shen, Chuanyun Zhang, Yingzeng Yin, Xiangjiang Zhong

引用次数: 0

Metasurface-based circularly polarised antenna: Enhanced bandwidth with characteristic mode analysis and symmetric branch design

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-10-02 DOI: 10.1049/mia2.12516

Yan Wang, Zhendong Ding, Junrui Yu, Jianyin Cao, Hao Wang, Michael Yan-Wah Chia, Nasimuddin Nasimuddin

{"title":"Metasurface-based circularly polarised antenna: Enhanced bandwidth with characteristic mode analysis and symmetric branch design","authors":"Yan Wang, Zhendong Ding, Junrui Yu, Jianyin Cao, Hao Wang, Michael Yan-Wah Chia, Nasimuddin Nasimuddin","doi":"10.1049/mia2.12516","DOIUrl":"https://doi.org/10.1049/mia2.12516","url":null,"abstract":"A low-profile circularly polarised (CP) metasurface antenna is proposed, utilising characteristic mode analysis (CMA). The antenna design features a two-layer laminated substrate, a 4×4 Butterfly-shaped metasurface, a rectangular slot, an irregular transmission line, and a ground plane. The metasurface is analysed using mode significance (MS), characteristic angle (CA), and characteristic current to determine the resonance bandwidth and CA resonance points, which exhibit a near 90° difference. At the intersection of the two MS modes, their CAs differ by nearly 90°, and their far-field radiation directions align, indicating the potential for achieving circular polarisation at the desired frequency. The integration of the metasurface with the slot antenna is simulated to validate the CMA findings. Additionally, the CP bandwidth is enhanced by modifying the transmission line branches. Measurement of the fabricated antenna reveals an impedance bandwidth (IBW) of 27.4%, a 3-dB axial ratio bandwidth (ARBW) of 10.1%, and a peak gain of 6.9 dBic at 4.4 GHz. Compared to the design without branches, IBW and ARBW have increased by 10% and 7.3%, respectively.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 12","pages":"974-984"},"PeriodicalIF":1.1,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12516","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143248312","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Full-angle beam scanning leaky-wave antenna array based on spoof surface plasmon polaritons

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-09-12 DOI: 10.1049/mia2.12512

Jun Wang, Yuqi Yao, Xianglin Kong, Ruofeng Xu, Lei Zhao

引用次数: 0

A low-profile tri-band shared-aperture antenna for Sub-6G wide-beam and millimetre-wave high-gain applications

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-09-11 DOI: 10.1049/mia2.12510

Chuang Wang, Wenquan Cao, Yangkun Zhu, Yixin Tong

{"title":"A low-profile tri-band shared-aperture antenna for Sub-6G wide-beam and millimetre-wave high-gain applications","authors":"Chuang Wang, Wenquan Cao, Yangkun Zhu, Yixin Tong","doi":"10.1049/mia2.12510","DOIUrl":"https://doi.org/10.1049/mia2.12510","url":null,"abstract":"To achieve multi-function integration and independent performance regulation of microwave and millimetre-wave (mm-Wave) shared-aperture antennas, a design method based on embedded structure fusion is proposed. In the Sub-6G band, a high-order mode annular-ring patch antenna is designed. To transform the non-broadside characteristics, the current distribution of TM31 and TM12 modes is reconstructed by slotting in the centre of the patch. Additionally, the electric field distribution is modified by loading shorting pins to achieve beam broadening. In the 5G mm-Wave band, a four-element high-gain substrate integrated waveguide (SIW) slotted cavity backed antenna array with low-sidelobe characteristics is obtained using the element interleaving technique. The SIW slotted cavity backed antenna array is integrated into the central area of the annular-ring patch to achieve aperture-sharing fusion. Experimental results demonstrate that the antenna operates in the Sub-6G dual-band of 2.1–2.2 GHz and 5.2–5.4 GHz, respectively. Furthermore, the widest half-power beamwidth measured in these two bands is 126° and 140°. In the mm-Wave band, the operating bandwidth is 26.5–29.5 GHz, with a gain of up to 18.8 dBi. Notably, the performance of different bands does not impact the other, and the measured isolation exceeds 40 dB. Furthermore, the antenna profile is only 0.008 λ0. Therefore, an ultra-low-profile microwave and mm-Wave shared-aperture antenna with multi-function integration and independent performance control is realised, which has great potential for application in 5G intelligent connected vehicle communications.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 12","pages":"932-943"},"PeriodicalIF":1.1,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12510","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143252366","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"计算机科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0