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Pattern-Reconfigurable, Circularly Polarized, High-Gain, Archimedean Spiral Antenna Array for Long-Distance, Wide-Coverage RFID Inventorying 用于远距离、广覆盖 RFID 盘点的模式可重构、圆极化、高增益、阿基米德螺旋天线阵列
Q2 Physics and Astronomy Pub Date : 2024-03-20 DOI: 10.1109/JRFID.2024.3379875
Da Yi;Ren-Long Zhang;Ming-Chun Tang;Jing-Feng Fu;Yao Li;Xing-Xing Li;Huapeng Zhao;Richard W. Ziolkowski
A low-cost, pattern-reconfigurable, circularly polarized, high-gain, radio-frequency identification (RFID) reader antenna array is presented. It is a $2times2$ array whose elements are based on an innovative Archimedean spiral design. A 4-way power divider feed network with switchable delay lines is designed that enables reconfiguring the radiation patterns of the array. Because of its high realized gain and nine reconfigurable states, the developed reader antenna can be applied in long-distance, wide-coverage RFID inventorying. The fabricated prototype, with dimensions $1.15times 1.15times 0.07~lambda _{L}^{3}$ at 920 MHz, achieves a measured axial-ratio (AR) fractional bandwidth of 4.6%, and a peak realized gain (RG) of 10.5 dBic (12 dBic without the feed network). The RG of its reconfigurable patterns is greater than 6 dBic within $theta $ = $0^{circ }pm 45^{circ }$ for all azimuth angles. It was also tested in an outdoor range as the reader antenna for a practical RFID system. The maximum read distance was 22.3 m.
本文介绍了一种低成本、可重新配置图案、圆极化、高增益的射频识别(RFID)阅读器天线阵列。这是一个 2 美元乘 2 美元的阵列,其元件基于创新的阿基米德螺旋设计。设计了一个带有可切换延迟线的 4 路功率分配器馈电网络,可以重新配置阵列的辐射模式。由于实现了高增益和九种可重新配置的状态,所开发的读取器天线可应用于远距离、大覆盖范围的 RFID 盘点。制作的原型尺寸为1.15/times 1.15/times 0.07~lambda _{L}^{3}$,频率为920 MHz,测得的轴向比(AR)分数带宽为4.6%,峰值实现增益(RG)为10.5 dBic(无馈电网络时为12 dBic)。其可重构图案的 RG 在所有方位角的 $theta $ = $0^{circ }pm 45^{circ }$ 范围内均大于 6 dBic。它还作为实用 RFID 系统的读取器天线在室外范围进行了测试。最大读取距离为 22.3 米。
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引用次数: 0
Parallel Dispatching: A New Paradigm for High-Speed Train Operation Management and Optimization 并行调度:高速列车运行管理与优化的新范例
Q2 Physics and Astronomy Pub Date : 2024-03-20 DOI: 10.1109/JRFID.2024.3379225
Min Zhou;Hairong Dong;Juanjuan Li;Runmei Li;Xuan Liu;Hongwei Wang
In order to tackle the intricate challenges of train dispatching and command within China’s extensive high-speed railways (HSRs) network, this paper presents a novel parallel dispatching approach founded on the ACP (Artificial systems, Computational experiments, and Parallel execution) methodology. We provide a comprehensive overview of the framework and technical architecture of the parallel dispatching system (PDS), offering detailed insights into each fundamental module. It initiates by establishing the PDS for HSRs, emphasizing the deep integration of the actual and artificial systems. The methods for train operation situation deduction, rapid dispatching strategy generation, and comprehensive evaluation of parallel dispatching are then expounded, each tailored to different scales. Subsequently, the paper proposes the creation of a parallel dispatching platform for HSRs, utilizing a real line’s dispatching system as a prototype. Two typical scenarios are considered to validate the effectiveness of the PDS. The computational experiments are designed and executed in the artificial dispatching system to facilitate accurate deduction of operational scenarios and swift generation of dispatching solutions within defined computational constraints. The adjustment effects are assessed and iteratively optimized through parallel execution. The research outcomes of this paper can serve as a theoretical foundation and technical resource for the design, implementation, and validation of PDS in China’s high-speed railway network.
为了应对中国高速铁路(HSR)网络中列车调度和指挥的复杂挑战,本文提出了一种基于 ACP(人工系统、计算实验和并行执行)方法的新型并行调度方法。我们全面概述了并行调度系统(PDS)的框架和技术架构,并对每个基本模块进行了详细介绍。报告从建立高铁并行调度系统入手,强调实际系统与人工系统的深度融合。然后阐述了列车运行态势推演、快速调度策略生成和并行调度综合评估的方法,每种方法都针对不同规模的列车运行态势而量身定制。随后,本文以实际线路的调度系统为原型,提出了高铁并行调度平台的创建方案。文中考虑了两个典型场景,以验证 PDS 的有效性。计算实验在人工调度系统中设计和执行,以便在规定的计算约束条件下准确推断运行场景并快速生成调度解决方案。通过并行执行对调整效果进行评估和迭代优化。本文的研究成果可作为中国高速铁路网 PDS 设计、实施和验证的理论基础和技术资源。
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引用次数: 0
Guest Editorial on Advanced Antennas for Radio Frequency Identification (RFID) Systems 射频识别(RFID)系统的先进天线》客座编辑文章
Q2 Physics and Astronomy Pub Date : 2024-03-20 DOI: 10.1109/JRFID.2024.3396948
Daniele Inserra;Andrea Michel
The RFID community is enjoying new impetus coming from the revolutionary Internet-of-Things (IoT) paradigm and its integration with new application scenarios like Industry 4.0. RFID technology, in fact, enables reliable communication at low cost and with lightweight apparatus, desirable features for pervasive devices employment as desired by the IoT. Nonetheless, commercial-off-the-shelf (COTS) solutions cannot be always employed in some of emerging application scenarios, requiring customized reader and/or tag antenna design. In order to collect the most recent developments in the antenna design research for both legacy and novel RFID application contexts, the IEEE Journal of Radio Frequency Identification proposed the special issue “Advanced Antennas for Radio Frequency Identification (RFID) Systems”. A RFID system and its performance clearly depend on the antenna ability, both on reader and tag sides, to make the system accessible from short or long distances, and on different environments. The latter is particularly important in the new RFID tag application contexts, e.g., industrial manufacturing processes, vehicular environments, etc., where tags are indifferently applied on heterogeneous materials, many times on metal surfaces, and for this reason the antenna design requires particular care. Moreover, the pervasive diffusion of RFID-IoT devices poses new challenges in inventory assessment, requiring even longer read ranges and wide coverage ability, which clearly translates in new reader/tag antenna requirements. The purpose of this special issue was therefore to encourage the research on novel RFID antenna design solutions for both reader and tag devices to face these new application scenarios and cope with the new challenging requirements. Starting from magnetic coupling resonant high-frequency (HF) RFID systems, Mukherjee et al. consider the annoying problem of HF RFID reading performance deterioration in the presence of metallic conductors in the close vicinity [A1]. This problem arises because of the eddy currents induced on the metal surface by a varying magnetic field generated by the reader coil, which in turn generate an opposite magnetic field that reduces the intensity of the original field, deteriorating the reader-tag communication performance. Authors study the possibility to employ an auxiliary coil in the proximity of the metal surface, and how this mitigates the deleterious surface current effect. Tag coils co-located with the auxiliary coil are fabricated and placed on the cap of a plastic container (where the cap contains an aluminum foil) and on a credit card size metal sheet to benchmark the read range capabilities, showing an almost doubled read range and an improvement of more than 44% if compared with the case no auxiliary coil, respectively.
革命性的物联网(IoT)模式及其与工业 4.0 等新应用场景的整合为 RFID 业界带来了新的动力。事实上,射频识别(RFID)技术能以低成本和轻便的设备实现可靠的通信,这是物联网所需的普及型设备的理想功能。然而,商业现货(COTS)解决方案并不能始终应用于某些新兴应用场景,这就需要定制化的读取器和/或标签天线设计。为了收集传统和新型 RFID 应用背景下天线设计研究的最新进展,《电气和电子工程师学会射频识别学报》(IEEE Journal of Radio Frequency Identification)提议出版 "射频识别(RFID)系统的先进天线 "特刊。射频识别(RFID)系统及其性能显然取决于读取器和标签两侧天线的能力,以实现系统在不同环境下的长距离或短距离访问。后者在新的 RFID 标签应用环境中尤为重要,如工业生产过程、车辆环境等,标签被随意地贴在不同的材料上,很多时候是贴在金属表面上,因此天线的设计需要特别小心。此外,RFID-IoT 设备的普及为库存评估带来了新的挑战,需要更远的读取距离和更广的覆盖能力,这显然需要新的读取器/标签天线。因此,本特刊旨在鼓励针对读写器和标签设备的新型 RFID 天线设计方案的研究,以应对这些新的应用场景和新的挑战性要求。Mukherjee 等人从磁耦合谐振高频 (HF) RFID 系统入手,研究了在金属导体近距离存在的情况下 HF RFID 读取性能下降的恼人问题[A1]。出现这一问题的原因是读取器线圈产生的变化磁场在金属表面诱发了涡流,涡流反过来又产生了相反的磁场,从而降低了原始磁场的强度,恶化了读取器与标签之间的通信性能。作者研究了在金属表面附近使用辅助线圈的可能性,以及如何减轻有害的表面电流效应。作者制作了与辅助线圈同位的标签线圈,并将其放置在塑料容器的盖子上(盖子上有铝箔)和信用卡大小的金属片上,对读取范围能力进行了基准测试,结果显示,与没有辅助线圈的情况相比,读取范围几乎增加了一倍,读取性能提高了 44% 以上。
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引用次数: 0
Zeroth-Order Serpentine Antenna With Omnidirectional Radiation Pattern for Anti-Metal Tag Antenna Design 用于反金属标签天线设计的具有全向辐射模式的零阶蛇形天线
Q2 Physics and Astronomy Pub Date : 2024-03-12 DOI: 10.1109/JRFID.2024.3376333
Muthukannan Murugesh;Eng-Hock Lim;Pei-Song Chee;Fwee-Leong Bong
A new double-layered serpentine antenna is proposed for designing an anti-metal tag with an omnidirectional radiation pattern on metallic surfaces using the concept of electric and magnetic loop currents. The zeroth-order resonance (ZOR) structure here is made up of two closely stacked serpentine lines for providing the strong capacitive reactance and parasitic elements that are required for supporting the zeroth-order resonance. Also, the geometrical parameters of the double-layered serpentine structure can control the capacitive reactance for tuning the tag resonant frequency effectively. Due to the successful excitation of the ZOR mode, our tag antenna can generate a reasonably good omnidirectional radiation pattern with a consistent read range of 7.9 m– 8.9 m (at EIRP of 4 W) on metal in all directions in the azimuth plane. It has a uniform spatial coverage ( $>$ 8 m) in the entire azimuth plane. Additionally, the antenna’s good impedance matching allows for an excellent power transmission of $sim 99$ %. The tag resonant frequency is found to be very stable and not affected much by any changes in the backing object and the maximum measured read range is $sim 9$ meters in $theta ,,{=},,pm $ 50 o at 915 MHz. It has a footprint of 50 mm $times50$ mm ( $0.153lambda times 0.153lambda$ ) with a low profile of 3.38 mm ( $0.010lambda$ ). Furthermore, the antenna configuration is a simple folded structure around the foam substrate, without comprising any complex structures.
本文提出了一种新型双层蛇形天线,用于利用电流和磁环流的概念设计一种在金属表面具有全向辐射模式的抗金属标签。这里的零阶谐振(ZOR)结构由两条紧密堆叠的蛇形线组成,用于提供支持零阶谐振所需的强电容电抗和寄生元件。此外,双层蛇形结构的几何参数可以控制电容电抗,从而有效调节标签谐振频率。由于成功激发了 ZOR 模式,我们的标签天线可以产生相当好的全向辐射模式,在方位面的所有方向上,对金属的读取距离稳定在 7.9 米至 8.9 米之间(EIRP 为 4 W)。它在整个方位平面内具有均匀的空间覆盖范围(8 米)。此外,天线良好的阻抗匹配使其功率传输率达到 99%。标签的谐振频率非常稳定,不会受到背衬物体任何变化的影响,在 915 MHz 频率下,最大测量读取距离为 9 米。它的占地面积为 50 毫米乘以 50 美元(0.153 美元乘以 0.153 美元),外形小巧,仅为 3.38 毫米(0.010 美元)。此外,天线结构是围绕泡沫基板的简单折叠结构,不包含任何复杂结构。
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引用次数: 0
Close Motion Estimation of UHF-RFID Tagged Objects Based on Electromagnetic Coupling 基于电磁耦合的 UHF-RFID 标签物体近距离运动估计
Q2 Physics and Astronomy Pub Date : 2024-03-11 DOI: 10.1109/JRFID.2024.3375795
Lorenzo Bianchi;Emidio Di Giampaolo;Francesco Martinelli;Fabrizio Romanelli
We consider the close relative motion of two UHF RFID tags and the problem is the estimation of the distance between the two tags, by measuring the Received Signal Strength Indicator (RSSI) and the phase of the RFID signal backscattered by one of the two tags. Due to the short distance considered, and hence to the electromagnetic coupling between the antennas, the measured RSSI and phase present a complex and ambiguous dependence on the distance between the tags. The problem is solved through two approaches, based respectively on a Multi-Hypothesis Extended and a Multi-Hypothesis Unscented Kalman Filter (MHEKF and MHUKF). The availability of phase and RSSI allows to mitigate the ambiguity in the problem and to estimate the distance without any information on its initial value. Simulation and experimental results show the effectiveness of the approach, with the MHUKF presenting slightly better performances compared to the MHEKF. The proposed setup can be applied in manufacturing, robotics, safety and in any context where the variable distance between two close objects should be monitored.
我们考虑了两个超高频 RFID 标签的近距离相对运动,问题是通过测量接收信号强度指示器(RSSI)和两个标签之一反向散射的 RFID 信号的相位来估计两个标签之间的距离。由于所考虑的距离很短,因此天线之间存在电磁耦合,测量到的 RSSI 和相位与标签之间的距离有着复杂而模糊的关系。该问题通过两种方法来解决,分别基于多假设扩展卡尔曼滤波器(MHEKF)和多假设无标点卡尔曼滤波器(MHUKF)。有了相位和 RSSI,就可以减少问题的模糊性,并在没有任何初始值信息的情况下估计距离。仿真和实验结果表明了该方法的有效性,其中 MHUKF 的性能略优于 MHEKF。建议的设置可应用于制造、机器人、安全以及任何需要监控两个近距离物体之间可变距离的场合。
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引用次数: 0
Automated Current Monitoring for Microchannel Plates on Fast Plasma Investigation 快速等离子体研究中微通道板的自动电流监测
Q2 Physics and Astronomy Pub Date : 2024-03-08 DOI: 10.1109/JRFID.2024.3398443
Joseph Patton;Alexander C. Barrie;Stewart Doe;Daniel Gershman;Levon Avanov;Ali Abedi
The Fast Plasma Investigation (FPI) is an instrument suite aboard NASA’s Magnetospheric Multiscale space physics mission, which is designed to study magnetic reconnection in the Earth’s magnetosphere. In this work, a predictive model of microchannel plate (MCP) current was developed for FPI to autonomously monitor the device currents. The results of an analysis of the resistance of the microchannel plates included in the FPI particle spectrometers are presented along with a new model that combines a physically-informed model of MCP resistance with an empirically-derived model of FPI instrument temperature. This improved estimation of MCP resistance allows for a more precise determination of nominal MCP current, enabling accurate detection of current anomalies.
快速等离子体调查(FPI)是美国国家航空航天局磁层多尺度空间物理任务上的一套仪器,旨在研究地球磁层中的磁重联。在这项工作中,为 FPI 开发了一个微通道板 (MCP) 电流预测模型,以自主监测设备电流。本文介绍了对 FPI 粒子分光计中的微通道板电阻的分析结果,以及一个新模型,该模型结合了 MCP 电阻的物理信息模型和 FPI 仪器温度的经验模型。这种改进的 MCP 电阻估算方法可以更精确地确定 MCP 的额定电流,从而准确检测电流异常。
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引用次数: 0
A Wireless Motion Sensor Operating Down to −28-dBm Energy Harvesting 工作频率低至 -28 分贝的能量收集无线运动传感器
Q2 Physics and Astronomy Pub Date : 2024-03-07 DOI: 10.1109/JRFID.2024.3374648
Yero Dia;Helena Ribeiro;Laurent Oyhenart;Elie Zaraket;Ludivine Fadel;Valerie Vigneras;Corinne Dejous;Nuno Carvalho;Simon Hemour
ZeroPower devices are the next generation of Internet of Things. Typically taping from ambient energy, or activated by a remote reader, their first and foremost challenge is the operation distance from the nearest RF source. Unfortunately, these systems can only be activated within a range of a few tens of meters due to their minimum activation power (also named reading sensitivity). This work reduces the harvesting power to a new threshold of −28dBm ( $1.5 mu text{W}$ ). We demonstrate a wireless motion sensor operating in burst mode with as low as 120 mV of DC voltage and $0.72 mu text{J}$ of stored energy. This efficient operation is achieved without any DC/DC conversion thanks to a four-stages rectifier biasing a tunnel diode Voltage-controlled oscillator (VCO).
零功耗设备是下一代物联网。它们通常利用环境能源或通过远程读取器激活,其首要挑战是与最近的射频源的操作距离。遗憾的是,由于这些系统的最小激活功率(也称为读取灵敏度),它们只能在几十米的范围内被激活。这项研究将采集功率降低到了-28dBm(1.5 美元)的新阈值。我们展示了一种在突发模式下工作的无线运动传感器,其直流电压低至 120 mV,存储能量为 0.72 mu text{J}$。由于采用了四级整流器为隧道二极管压控振荡器(VCO)提供偏压,因此无需任何直流/直流转换即可实现这种高效运行。
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引用次数: 0
Co-Location of PV Panel With Meshed Antenna Array for Inter-Satellite Energy Transmission 光伏电池板与网状天线阵列共址用于卫星间能量传输
Q2 Physics and Astronomy Pub Date : 2024-03-06 DOI: 10.1109/JRFID.2024.3397575
A. Baris Gok;Diego Masotti;Alessandra Costanzo
This paper investigates the design and fabrication, by additive manufacturing, of optically transparent meshed patch antenna arrays atop photovoltaic (PV) panels. This integration is foreseen to be exploited in space by small satellites to enable wireless power transfer among them, while maintaining optimal solar power production, with no need for extra areas for the antenna subsystems. The proposed antenna arrays utilize a novel approach, where horizontal conductive strips of a meshed metallization are removed, to enhance transparency without compromising antenna performance. Two arrays are designed at 2.45 GHz and 5.8 GHz, and the associated design choices and issues are discussed. The antenna metallizations make use of vertical strips only with a line spacing of $0.04boldsymbol {lambda }$ , found to be the best compromise to ensure maximal transparency and antenna performance, using low-cost printing technique on 110 mm $times $ 110 mm borosilicate glass. Simulations and experiments show that the underlying PV metallization patterns have a significant impact on the antenna radiation properties at the highest operating frequency of 5.8 GHz. In this case, a degradation of the antenna gain compared to the predictions is observed. Through a reverse-engineering method, this effect is modeled by the effective electromagnetic characteristics of the glass substrate, rather than by accounting for the pattern layout-wise. It is demonstrated that this choice enables an efficient yet accurate full-wave simulation of the entire system, suggesting the necessity for a co-design of the PV panel and the antenna to facilitate an accurate representation of the entire system and its current radiating characteristics.
本文研究了在光伏(PV)板上设计和制造光学透明网状贴片天线阵列的增材制造方法。预计小型卫星将在太空中利用这种集成技术实现卫星之间的无线电力传输,同时保持最佳的太阳能发电量,而无需为天线子系统预留额外区域。拟议的天线阵列采用了一种新方法,即去除网格金属化的水平导电条,从而在不影响天线性能的情况下提高透明度。设计了两个频率分别为 2.45 GHz 和 5.8 GHz 的阵列,并讨论了相关的设计选择和问题。天线金属化仅使用垂直条带,线间距为 0.04 美元,这是确保最大透明度和天线性能的最佳折衷方案,使用低成本印刷技术在 110 毫米的硼硅玻璃上印刷。模拟和实验表明,在最高工作频率 5.8 GHz 时,底层光伏金属化图案对天线辐射性能有重大影响。在这种情况下,与预测值相比,天线增益有所下降。通过逆向工程方法,这种影响是通过玻璃基板的有效电磁特性来模拟的,而不是通过对图案布局的考虑。结果表明,这种选择能够对整个系统进行高效而准确的全波仿真,这表明有必要对光伏板和天线进行共同设计,以促进整个系统及其当前辐射特性的准确呈现。
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引用次数: 0
Experimental Evaluation of a Cognitive Routing Strategy for Efficient Energy Management in DTN 针对 DTN 高效能源管理的认知路由策略的实验评估
Q2 Physics and Astronomy Pub Date : 2024-03-06 DOI: 10.1109/JRFID.2024.3397582
Ricardo Lent
This study conducts an experimental evaluation of a decentralized cognitive routing approach to improve the performance of Delay Tolerant Networks (DTNs) in challenging environments, particularly in space. The primary goal is to minimize latency while concurrently extending the operational lifetimes of nodes by strategically avoiding bundle transmission through low-charged relay nodes. The approach addresses multi-objective routing through a reinforcement learning formulation that considers either the delay or path length to the destination, jointly with the residual energy levels of nodes along the transmission path. It also defines suitable networking mechanisms to obtain accurate estimates of delay-energy metrics associated with node contacts. The paper provides details of the implementation strategy for the High-Rate Delay Tolerant Networking (HDTN) framework and the design of a battery emulation system that provides precise control over experimental conditions, ensuring test reproducibility. The results demonstrate significant reductions in bundle losses and extended network lifetimes while maintaining either delay or path lengths within reasonable bounds compared to what can be achieved with the current routing standard. The proposed approach holds the promise of significantly improving the reliability of DTN communications in space.
本研究对一种分散式认知路由方法进行了实验评估,以提高容错网络(DTN)在具有挑战性的环境中,尤其是在太空中的性能。其主要目标是最大限度地减少延迟,同时通过战略性地避免通过低电荷中继节点进行捆绑传输来延长节点的运行寿命。该方法通过强化学习公式解决多目标路由问题,该公式考虑了到目的地的延迟或路径长度,以及传输路径上节点的剩余能量水平。它还定义了合适的联网机制,以获得与节点接触相关的延迟-能量指标的精确估算。论文详细介绍了高速率延迟容限网络(HDTN)框架的实施策略以及电池仿真系统的设计,该系统可精确控制实验条件,确保测试的可重复性。结果表明,与目前的路由标准相比,在保持延迟或路径长度在合理范围内的同时,捆绑损耗大幅降低,网络寿命延长。所提出的方法有望显著提高空间 DTN 通信的可靠性。
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引用次数: 0
Lens Antenna Design Tool Based on Generalized Superformula 基于广义超公式的透镜天线设计工具
Q2 Physics and Astronomy Pub Date : 2024-03-02 DOI: 10.1109/JRFID.2024.3396333
Alberto Facchini;Francesco Paolo Chietera;Riccardo Colella;Luca Catarinucci;Pietro Bia;Luciano Mescia
In this work, the design of a novel class of 3D dielectric lens antennas through the use of a lab-made electromagnetic tool is presented. The lens antenna is modeled using a generalized superformula allowing additional degree of freedom which can be exploited to obtain complex lens shapes with flat surface regions, steep sides, a non-rotational symmetry, or a modulated and aspherical surface profile. Thanks to the free parameters characterizing this formula, the lens geometry can be adjusted in a simple and analytical way. The electromagnetic tool is based on the geometrical optics and tube tracing approximations as well as the physical optics approach. In this way, the multiple wave reflections within the lens region as well as the far field outside the lens can be calculated. Moreover, an efficient synthesis procedure based on swarm intelligence has been developed and integrated in the numerical code. Thanks to this design tool it is possible to identify the lens parameters yielding the optimal antenna characteristic and a desired radiation patterns with low computational burden.
在这项工作中,通过使用实验室制造的电磁工具,介绍了一类新型三维介质透镜天线的设计。透镜天线使用广义超公式建模,允许额外的自由度,可利用这些自由度获得具有平坦表面区域、陡峭侧面、非旋转对称或调制和非球面表面轮廓的复杂透镜形状。得益于该公式的自由参数,透镜的几何形状可以通过简单的分析方法进行调整。电磁学工具基于几何光学和管跟踪近似以及物理光学方法。通过这种方法,可以计算透镜区域内的多重波反射以及透镜外的远场。此外,还开发了一种基于蜂群智能的高效合成程序,并将其集成到数值代码中。借助这一设计工具,可以确定透镜参数,从而以较低的计算负担获得最佳的天线特性和理想的辐射模式。
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引用次数: 0
期刊
IEEE journal of radio frequency identification
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