Advanced Electromagnetics最新文献_第7页

Highly Directive Array Pattern Synthesis in Different phi Planes of a Large CCRAA Using Array Thinning Technique 利用阵列细化技术合成大型CCRAA不同phi平面的高定向阵列方向图

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Advanced Electromagnetics Pub Date : 2022-04-05 DOI: 10.7716/aem.v11i2.1828

S. Dubey, D. Mandal, A. K. Mishra

{"title":"Highly Directive Array Pattern Synthesis in Different phi Planes of a Large CCRAA Using Array Thinning Technique","authors":"S. Dubey, D. Mandal, A. K. Mishra","doi":"10.7716/aem.v11i2.1828","DOIUrl":"https://doi.org/10.7716/aem.v11i2.1828","url":null,"abstract":"This paper presents a pattern synthesis method of a sizeable concentric circular ring array (CCRAA) of isotropic antennas using Evolutionary Algorithms. In this method, the array is thinned using the optimum set of binary excitations to achieve the desired highly directive pencil beam patterns with lower peak side lobe level(SLL). The half-power beam width and first null beam width is kept constant to obtain such highly directive beam patterns with lower peak SLL. This pattern is not synthesized to a particular azimuth plane rather in four different ' planes from entire azimuth planes. The isotropic elements are uniformly spaced in the concentric ring. The achieved set of optimum amplitudes are constructed with either 1 or 0 using Differential Evolutionary Algorithm(DE), Genetic Algorithm (GA), and Particle Swarm Optimization Algorithm (PSO). These excitations show the state of the elements. The elements are in “ON” state or in “OFF” state depending upon the excitation ‘1’ or ‘0’. It is also helpful to reduce the complexity of the feed networks. The excitations are also verified in the whole range (0o <phi<360o) of ' planes by selecting four phi planes arbitrarily. The outcomes established the superiority of GA and DE over PSO and also the effectiveness of the proposed method.","PeriodicalId":44653,"journal":{"name":"Advanced Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47543892","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-Wideband Circular Microstrip Antenna with Hybrid EBG for reduced SAR 用于缩减SAR的混合EBG超宽带圆形微带天线

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Advanced Electromagnetics Pub Date : 2022-04-03 DOI: 10.7716/aem.v11i1.1688

M. Munde, A. Nandgaonkar, S. Deosarkar

{"title":"Ultra-Wideband Circular Microstrip Antenna with Hybrid EBG for reduced SAR","authors":"M. Munde, A. Nandgaonkar, S. Deosarkar","doi":"10.7716/aem.v11i1.1688","DOIUrl":"https://doi.org/10.7716/aem.v11i1.1688","url":null,"abstract":"This article presents a basic ultra-wideband circular microstrip antenna (UWB-CMSA) with partial ground resonating from 2.38 GHz to 12 GHz for handheld devices. The designed antenna covers bands for Bluetooth (2.4 GHz), LTE (2.5/2.69 GHz), WLAN (2.4/3.5/5 GHz), and WiMAX (2.5/3.5/5.5) GHz applications. Specific Absorption Rate (SAR) values of certain bands exceed a limit for UWB-CMSA. The uniplanar spiral unit cell is designed and exhibits phase reversal for 2.4 GHz, 3.5 GHz, and 5.5 GHz. EBG unit cells are placed near the feed for surface wave minimization so as to achieve a reduction in SAR. Furthermore, the EBG structure is placed on the ground plane to analyze the impact, also designs are fabricated and results are compared. Mushroom type M-shaped unit cell is designed which offers phase reversal at 2.3 GHz which is placed near feed in a similar fashion to the earlier spiral one to suppress surface waves also the structure is investigated by arranging it on the ground plane. It is evident that SAR is reduced for all the cases being inspected but for certain bands it exceeds the limit of 1.6 W/kg. A combination of two different unit cells to form a hybrid EBG structure is proposed and evaluated by placing it near the feed. SAR is curtailed by 87.05% at 5.5 GHz.","PeriodicalId":44653,"journal":{"name":"Advanced Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45513469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Design of Microstrip Tchebyscheff Phased Array Antennas for Inter-Vehicular Communication 车际通信微带切比舍夫相控阵天线设计

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Advanced Electromagnetics Pub Date : 2022-04-03 DOI: 10.7716/aem.v11i1.1909

J. S. Roy

引用次数: 0

An Innovative Odd-Power Divider by means of a Triple FinLine Waveguide to Microstrip Transition 一种创新的三鳍线波导-微带转换奇数功率分配器

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Advanced Electromagnetics Pub Date : 2022-04-03 DOI: 10.7716/aem.v11i1.1742

S. Fantauzzi, L. Valletti, D. Passi, F. Paolo

引用次数: 4

A High Gain Antenna with DGS for Sub-6 GHz 5G Communications 用于6 GHz以下5G通信的DGS高增益天线

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Advanced Electromagnetics Pub Date : 2022-04-02 DOI: 10.7716/aem.v11i1.1670

T. Olawoye, Pradeep Kumar

引用次数: 9

Perturbation-Asymptotic Series Approach for an Electromagnetic Wave Problem in an Epsilon Near Zero (ENZ) Material 近零Epsilon (ENZ)材料中电磁波问题的摄动-渐近级数法

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Advanced Electromagnetics Pub Date : 2022-04-01 DOI: 10.7716/aem.v11i1.1668

M. K. Akkaya, A. Yılmaz, M. Kuzuoglu

引用次数: 0

Design and experimental validation of a multifunction Single layer UHF-RFID Tag antenna 一种多功能单层UHF-RFID标签天线的设计与实验验证

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Advanced Electromagnetics Pub Date : 2022-03-15 DOI: 10.7716/aem.v11i1.1639

M. El Bakkali, M. A. Ennasar, O. El Mrabet, R. F. García

引用次数: 0

Band Pass Negative Group Delay demonstration on a VHF RLC parallel passive lumped circuit VHF RLC并联无源集总电路的带通负群延迟演示

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Advanced Electromagnetics Pub Date : 2022-02-18 DOI: 10.7716/aem.v11i1.1858

E. Sambatra, Y. C. Mombo Boussougou, Lucius Ramifidisoa, Jean-Paterne Kouadio, S. Ngoho, A. Jaomiary, N. Murad

{"title":"Band Pass Negative Group Delay demonstration on a VHF RLC parallel passive lumped circuit","authors":"E. Sambatra, Y. C. Mombo Boussougou, Lucius Ramifidisoa, Jean-Paterne Kouadio, S. Ngoho, A. Jaomiary, N. Murad","doi":"10.7716/aem.v11i1.1858","DOIUrl":"https://doi.org/10.7716/aem.v11i1.1858","url":null,"abstract":"This paper demonstrates the bandpass (BP) negative group delay (NGD) function on a passive RLC-parallel lumped network at Very High Frequencies (VHF). After the topological description of the RLC cell, the BP NGD analysis is introduced. The NGD circuit is modelled theoretical by means of voltage transfer function (VTF) expression. The analytical equations illustrating the BP NGD specifications as the NGD center frequency, NGD value, NGD bandwidth and the VTF attenuation are established in function of the R, L and C component parameters. A proof of concept is designed, fabricated as a SMD on printed circuit board, and measured. As expected, the different models (calculated, simulated and measured) present a BP NGD and are significantly corelated. The POC prototype (resp the calculated and simulated model), presents an NGD value of - 8 ns (resp -12 ns) and attenuation of - 10 dB (resp -8 dB) around a 225 MHz (resp 240 MHz) NGD center frequency. Uncertainties analysis (UA) of BP NGD specifications is also studied in order to show the influence of quality and tolerance of components for NGD circuit. The theoretical formulas of NGD specification UAs in function of R, L and C tolerances are derived. UAs with respect to 1%, 2% and 5% relative tolerances of R, L and C components constituting the POC designed circuit are performed.","PeriodicalId":44653,"journal":{"name":"Advanced Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46064516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Temporal Spectrum of a Scattered Electromagnetic Waves in the Conductive Collision Turbulent Magnetized Plasma 传导碰撞湍流磁化等离子体中散射电磁波的时间谱

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Advanced Electromagnetics Pub Date : 2022-01-06 DOI: 10.7716/aem.v11i1.1859

G. Jandieri, A. Ishimaru, B. Rawat, N. Tugushi

{"title":"Temporal Spectrum of a Scattered Electromagnetic Waves in the Conductive Collision Turbulent Magnetized Plasma","authors":"G. Jandieri, A. Ishimaru, B. Rawat, N. Tugushi","doi":"10.7716/aem.v11i1.1859","DOIUrl":"https://doi.org/10.7716/aem.v11i1.1859","url":null,"abstract":"Using WKB method the peculiarities of the temporal spectrum of an ordinary and extraordinary electromagnetic wave scattered in a weakly randomly inhomogeneous three-dimensional nonstationary and conductive magnetized plasma are investigated. On the basis of the stochastic differential transport equation for the frequency fluctuation the broadening and the displacement of the temporal spectrum for both waves are obtained for the polar terrestrial ionosphere. These statistical characteristics contains anisotropic parameters: velocity of a plasma stream, conductivities of the ionosphere, elongated electron density irregularities are characterized by the anisotropy factor and inclination angle with respect to the geomagnetic lines of forces. The analysis of the power spectrum of the waves as a function of the propagation distance and the nondimensional frequency parameter containing the carrier frequency and characteristic temporal scale of electron density fluctuations are carried out. Analytical and numerical calculations have shown that the terrestrial conductivity and anisotropy factors exert a substantial influence on evaluation of the temporal spectrum than the inclination angle. It was found that the wave spectrum increases initially as the square root of the propagation distance, but at large distances it approaches a limiting value. Statistical moments of a scattered ordinary and extraordinary waves do not depend on an absorption sign and valid for both absorptive and active media.","PeriodicalId":44653,"journal":{"name":"Advanced Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2022-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46197958","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An Effective Antenna Array Diagnosis Method via Multivalued Neural Network Inverse Modeling Approach 一种有效的基于多值神经网络逆建模的天线阵列诊断方法

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Advanced Electromagnetics Pub Date : 2021-12-27 DOI: 10.7716/aem.v10i3.1784

O. J. Famoriji, T. Shongwe

{"title":"An Effective Antenna Array Diagnosis Method via Multivalued Neural Network Inverse Modeling Approach","authors":"O. J. Famoriji, T. Shongwe","doi":"10.7716/aem.v10i3.1784","DOIUrl":"https://doi.org/10.7716/aem.v10i3.1784","url":null,"abstract":"Failure of element (s) in antenna arrays impair (s) symmetry and lead to unwanted distorted radiation pattern. The replacement of defective elements in aircraft antennas is a solution to the problem, but it remains a critical problem in space stations. In this paper, an antenna array diagnosis technique based on multivalued neural network (mNN) inverse modeling is proposed. Since inverse analytical input-to-output formulation is generally a challenging and important task in solving the inverse problem of array diagnosis, ANN is a compelling alternative, because it is trainable and learns from data in inverse modelling. The mNN technique proposed is an inverse modelling technique, which accommodates measurements for output model. This network takes radiation pattern samples with faults and matches it to the corresponding position or location of the faulty elements in that antenna array. In addition, we develop a new training error function, which focuses on the matching of each training sample by a value of our proposed inverse model, while the remaining values are free, and trained to match distorted radiation patterns. Thereby, mNN learns all training data by redirecting the faulty elements patterns into various values of the inverse model. Therefore, mNN is able to perform accurate array diagnosis in an automated and simpler manner.","PeriodicalId":44653,"journal":{"name":"Advanced Electromagnetics","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48489609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1