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

A beamwidth and beam direction reconfigurable antenna based on multi-mode parasitic coupling 基于多模寄生耦合的波束宽度和波束方向可重构天线

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-05-30 DOI: 10.1049/mia2.12483

Haoran Zhao, Binyun Yan, Weixing Sheng

引用次数: 0

Determining the parameters of a dielectric ellipsoid for minimising front echo in Gaussian pulse scattering analysis 在高斯脉冲散射分析中确定介质椭球参数以最小化前回波

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-05-23 DOI: 10.1049/mia2.12480

Emre İşcan, Vasil Tabatadze, Sebahattin Eker

{"title":"Determining the parameters of a dielectric ellipsoid for minimising front echo in Gaussian pulse scattering analysis","authors":"Emre İşcan, Vasil Tabatadze, Sebahattin Eker","doi":"10.1049/mia2.12480","DOIUrl":"https://doi.org/10.1049/mia2.12480","url":null,"abstract":"A novel numerical method is introduced for minimising the presence of scattering echoes in the frontal area of a dielectric ellipsoid through the application of the method of auxiliary sources (MAS) method. This approach utilises a Gaussian radio pulse that spans the frequency spectrum from 0 to 6 GHz. The approach involves determining the properties of an ellipsoid, such as its dimensions and a dielectric permittivity, using a specially developed MATLAB software package to make this ellipsoid invisible. This provides a valuable military and defence technology tool, particularly for stealth and invisibility technology applications. It is beneficial for avoiding detection by radar systems utilised for enemy surveillance and identifying concealed objects. This aims to eliminate the need for metamaterials for invisibility cloaking. The suggested methodology has been confirmed through a validation process, which involved a comparison of the outcomes derived from numerical experiments conducted during pulse echo observations using the FDTD method and an analytical solution. MAS offers a notable advantage over other methods and commercial software by significantly reducing computational time for simulating and analysing 3D dielectric objects. This allows for quicker consideration of various parameter scenarios and optimisation for desired outcomes.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 7","pages":"552-562"},"PeriodicalIF":1.1,"publicationDate":"2024-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12480","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730218","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 three-dimensional parabolic equation with fast reordered-alternate direction decomposition in atmosphere duct environment 大气管道环境中的三维抛物线方程与快速重定向分解

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-05-15 DOI: 10.1049/mia2.12479

Liang Shuai Shuai, Li Lei, Zhang Rui, Lin Le Ke, Yang Xiao, Li Zhuo Chen

{"title":"A three-dimensional parabolic equation with fast reordered-alternate direction decomposition in atmosphere duct environment","authors":"Liang Shuai Shuai, Li Lei, Zhang Rui, Lin Le Ke, Yang Xiao, Li Zhuo Chen","doi":"10.1049/mia2.12479","DOIUrl":"https://doi.org/10.1049/mia2.12479","url":null,"abstract":"In the design and optimisation of marine wireless communication and navigation systems, a thorough investigation of radio wave propagation characteristics under atmospheric ducting conditions is essential. The authors aim to enhance the efficiency of radio wave propagation loss prediction in marine atmospheric ducting environments, proposing a prediction model based on Fast Reordered-Alternate Direction Decomposition (FR-ADD). By approximating the diffraction term into three independent components, exploiting the commutative properties of the Fourier transform to reduce the spatial dimensions, and incorporating a rapid algorithm for the parabolic equation, the model optimises the stepping process and significantly improves computational efficiency. Simulation experiments demonstrate that, in the long-distance and complex marine ducting environments, the model not only maintains prediction accuracy but also substantially reduces computational load and prediction time, effectively realising over-the-horizon propagation prediction. In the experiment of radio wave propagation characteristics in the Yellow and Bohai Seas, the simulation data from the FR-ADD model showed significant correlation with actual measurements and simulations from the AREPS software, confirming the method's efficiency and practicality.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 7","pages":"537-551"},"PeriodicalIF":1.1,"publicationDate":"2024-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12479","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730125","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

Theoretical and experimental investigations on a compact TE11 mode bend for high-power transmission line 用于大功率传输线的紧凑型 TE11 模弯曲器的理论与实验研究

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-05-13 DOI: 10.1049/mia2.12478

Keqiang Wang, Hao Li, Tianming Li, Chaoxiong He

{"title":"Theoretical and experimental investigations on a compact TE11 mode bend for high-power transmission line","authors":"Keqiang Wang, Hao Li, Tianming Li, Chaoxiong He","doi":"10.1049/mia2.12478","DOIUrl":"https://doi.org/10.1049/mia2.12478","url":null,"abstract":"The oversized TE11 mode bend is able to make the transmission direction of electromagnetic wave to turn 90°, and it is one of the key components in the high-power microwave system. The mode coupling characteristics between the TE11 and parasitic modes under two different polarisations in the bending waveguide are analysed, and it is found that the TE11 suffers less interferences from parasitic modes when its polarisation direction is perpendicular to the bending plane, and the corresponding 90° TE11 bend is easier to realise high performance. To verify this analysis, an oversized 90° TE11 bend waveguide working at 10 GHz is designed, and its structural length is only 7.5 times the central working wavelength. Simulated results indicate that its relative bandwidth is 15.6% when the transmission efficiency is over 98%, and its maximum power handling capacity reaches 5.6 GW at short microwave pulse duration (less than 100 ns). The S-parameters indicate that its S21 is about −0.1 dB from 9.5 to 10.5 GHz, and its S11 is under −25 dB in the same frequency range. Meanwhile, the high power test indicates that the bend works stably when the injected power is 3 GW.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 7","pages":"529-536"},"PeriodicalIF":1.1,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12478","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730030","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

Dual- and triple-passband coupled-complementary FSSs based on the four-arms star geometry 基于四臂星形几何结构的双通道和三通道耦合互补 FSS

IF 1.1 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-05-10 DOI: 10.1049/mia2.12477

Deisy F. Mamedes, Jens Bornemann, Alfredo Gomes Neto, Sérgio L. M. Sales Filho

引用次数: 0

Cross-talk reduction in metamaterial and non-uniform transmission lines 减少超材料和非均匀传输线中的串扰

IF 1.7 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-05-02 DOI: 10.1049/mia2.12476

Hamid Reza Abbasi, Jalil A. Rashed-Mohassel, Mohammad Naser Moghadasi

引用次数: 0

Low sidelobe planar electrically large sparse array antenna with element number reduction based on genetic algorithm 基于遗传算法减少元素数量的低侧叶平面电大稀疏阵列天线

IF 1.7 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-05-01 DOI: 10.1049/mia2.12475

Yangkun Zhu, Wenyu Ma, Chuang Wang, Wenquan Cao

{"title":"Low sidelobe planar electrically large sparse array antenna with element number reduction based on genetic algorithm","authors":"Yangkun Zhu, Wenyu Ma, Chuang Wang, Wenquan Cao","doi":"10.1049/mia2.12475","DOIUrl":"https://doi.org/10.1049/mia2.12475","url":null,"abstract":"Conventionally, both electrically larger (EL) arrays and sparse arrays offer the advantage of element number reduction but disadvantage of high sidelobe levels. A new scheme of planar EL sparse array antenna based on a genetic algorithm (GA) to achieve low sidelobe with element number reduction is proposed. To begin with, EL sparse array antenna optimisation models based on GA for both linear and planar arrays are analysed. Then, an EL slot antenna element based on a 3 × 3 substrate integrated waveguide cavity is designed. An 8-element linear EL sparse array antenna is designed and compared with a uniform array antenna, demonstrating a reduction in the maximum sidelobe level (MSLL) by nearly 4.6 dB. After that, a 4 × 8 element planar EL sparse array antenna is fabricated and measured. Compared to an 8 × 16 element planar EL uniform array antenna, the number of antenna elements is reduced by 75%, while the MSLL is reduced by approximately 3 dB. The measured −10 dB impedance bandwidth ranges from 25.3 to 27.8 GHz. At the central frequency, the radiation pattern achieves a peak gain of 29.6 dBi, exhibiting low sidelobe levels below −15.0 dB.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 6","pages":"447-458"},"PeriodicalIF":1.7,"publicationDate":"2024-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12475","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141424872","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

Iterative synthesis method for high-directivity symmetrical stepped-impedance microstrip parallel-line coupler 高指向性对称阶梯阻抗微带平行线耦合器的迭代合成方法

IF 1.7 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-04-23 DOI: 10.1049/mia2.12474

Yun Liu, Xiaojie Zhang, Zhuo Li

{"title":"Iterative synthesis method for high-directivity symmetrical stepped-impedance microstrip parallel-line coupler","authors":"Yun Liu, Xiaojie Zhang, Zhuo Li","doi":"10.1049/mia2.12474","DOIUrl":"https://doi.org/10.1049/mia2.12474","url":null,"abstract":"Traditional quarter-wavelength parallel-line couplers (QWPLC) in microstrip form suffer heavily in low directivity because of unbalanced even-mode and odd-mode phase velocities. Related schemes to improve directivity lead to complex structures and large dimensions. This study derives and validates an iterative synthesis method to design a high-directivity microstrip coupler adopting a symmetric stepped-impedance microstrip coupled line (SSIMCL). Given that the even-mode and odd-mode effective dielectric constants (EDCs) vary with the characteristic impedances, the authors take the EDCs of traditional QWPLC as the initial values for an SSIMCL, and the characteristic impedances and EDCs can be computed and converged in several iterations, resulting in good phase delay balance and high coupler directivity. A 20-dB microstrip coupler working at 1 GHz with high directivity is designed, fabricated, and measured. The obtained maximum directivity is 47 dB and approximately 1 GHz, while the relative bandwidth with a directivity higher than 20 dB and a return loss better than 20 dB is larger than 70%. The novel microstrip coupler also features a compact, simple structure shorter than λg/4.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 6","pages":"439-446"},"PeriodicalIF":1.7,"publicationDate":"2024-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12474","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141425127","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

Horn array antenna with high aperture efficiency and suppressed grating lobes 具有高孔径效率和抑制光栅裂片的喇叭阵天线

IF 1.7 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-04-08 DOI: 10.1049/mia2.12473

Mohamad Hossein Anjomshoa, Seyed Ali Razavi Parizi

引用次数: 0

A wideband end-fire stepped slot antenna with gain enhancement and filtering capability 具有增益增强和滤波功能的宽带端射阶梯槽天线

IF 1.7 4区计算机科学

Iet Microwaves Antennas & Propagation Pub Date : 2024-04-05 DOI: 10.1049/mia2.12472

Shiyan Wang, Hao-Chen Li, Yin Li, Zai-Cheng Guo, Gang Zhang, Li Yang, Roberto Gómez-García

{"title":"A wideband end-fire stepped slot antenna with gain enhancement and filtering capability","authors":"Shiyan Wang, Hao-Chen Li, Yin Li, Zai-Cheng Guo, Gang Zhang, Li Yang, Roberto Gómez-García","doi":"10.1049/mia2.12472","DOIUrl":"10.1049/mia2.12472","url":null,"abstract":"A wideband end-fire stepped slot antenna with gain enhancement and filtering capability is proposed. On one hand, a parasitic dipole serving as a director is introduced in the stepped slot to improve the radiation gain of the slot antenna without increasing its physical size. It is found that a gain enhancement of about 2 dB can be achieved after adopting such approach. On the other hand, an absorptive branch possessing a nearly complementary frequency response with regard to the one of the slot antenna is in-parallel loaded at the microstrip feedline. It allows the partial dissipation of the out-of-band/non-radiated RF-signal power of the antenna to attain both an RF-quasi-absorptive behaviour and filtering capability. It is found that after loading the dissipative branch, the out-of-band radiation efficiency of the slot antenna is reduced to less than 20%. The measured results of a fabricated proof-of-concept antenna prototype show a reasonable agreement with the simulated ones and verify the RF performance merits of the proposed stepped slot antenna, such as wide RF operating band covering the 3.39−4.73-GHz range, end-fire radiation with a front-to-back ratio (FBR) above 10 dB, flat radiation gain, and co-integrated filtering functionality with RF-quasi-absorptive capability.","PeriodicalId":13374,"journal":{"name":"Iet Microwaves Antennas & Propagation","volume":"18 6","pages":"422-429"},"PeriodicalIF":1.7,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1049/mia2.12472","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140575416","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