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2022 International Workshop on Antenna Technology (iWAT)最新文献

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Characterization of Capacitor-Loaded Transmission Line for Phase Shifter Application 移相器用电容负载传输线的特性研究
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9810901
Zulfi, J. Suryana, A. Munir
This paper describes a characterization of transmission line with capacitor loading which is applicable for phase shifters. The used transmission line is composed of common microstrip lines that are loaded with capacitors placed at regular intervals. A theoretical approach shows that the transmission phase on the capacitor-loaded microstrip line depends on the capacitances of the loading capacitors, thus it is beneficial for configuring a phase shifter circuit. A prototype of capacitorloaded microstrip line operating at a center frequency of 2.4 GHz has been implemented for experimental characterization. The measurement result shows that the maximum phase shift of 70o could be obtained corresponding to the transmission and return losses of less than 0.4 dB and 14 dB, respectively.
本文介绍了一种适用于移相器的电容负载传输线的特性。使用的传输线由普通微带线组成,这些微带线上装有按一定间隔放置的电容器。理论分析表明,负载电容微带线路上的传输相位取决于负载电容的电容,这有利于配置移相电路。工作在2.4 GHz中心频率的电容负载微带线原型已经实现用于实验表征。测量结果表明,在传输损耗小于0.4 dB、回波损耗小于14 dB的情况下,可获得最大相移700o。
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引用次数: 4
ESPAR Antenna with Double Ring Placement of Parasitic Elements 寄生元件双环放置ESPAR天线
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9811032
M. Rahman, H. Ryu
In this paper, we like to propose an Electronically Steerable Parasitic Array Radiator (ESPAR) antenna for Ultra-High Frequency (UHF) Radio Frequency Identification (RFID) communication system to overcome the interference. The desired beam steering could be achieved without the use of phase shifters using ESPAR antenna. In this antenna, the beam driving element is surrounded by closely spaced double ring parasitic elements. So, we have proposed the architecture of double ring ESPAR antenna for minimum interference, and for optimum SNR (Signal to Noise Ratio) value over long distance communication between the RFID tag and reader. The suggested ESPAR antenna shows very good performance based on gain, radiation pattern, and reflection coefficient. The maximum value of gain of the proposed ESPAR antenna is obtained as 7.63 dBi which will successfully handle the interference at the respective directions to be communicated over long distance as compared to the previously published once designed antennas at the ISM band of 2.40 GHz frequency. This proposed design could be applied in numerous personal communications such as ECG (electrocardiogram) monitoring system, weather tracking, and in many others Wireless Sensor Network (WSN) applications.
本文提出了一种用于超高频(UHF)射频识别(RFID)通信系统的电子可操纵寄生阵列辐射(ESPAR)天线,以克服干扰。采用ESPAR天线,可以在不使用移相器的情况下实现所需的波束转向。在这种天线中,波束驱动元件被紧密间隔的双环寄生元件包围。因此,我们提出了双环ESPAR天线架构,以实现RFID标签和阅读器之间长距离通信的最小干扰和最佳信噪比。所设计的ESPAR天线在增益、辐射方向图和反射系数方面均表现出良好的性能。ESPAR天线的增益最大值为7.63 dBi,与之前发布的曾设计的ISM频段2.40 GHz天线相比,该天线能够成功地处理远距离通信各自方向的干扰。该设计可以应用于许多个人通信,如ECG(心电图)监测系统,天气跟踪,以及许多其他无线传感器网络(WSN)应用。
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引用次数: 4
Circularly polarized on chip dielectric resonator antenna at 60 GHz 60 GHz圆极化片上介质谐振器天线
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9810996
Meshari D. Alanazi, S. Khamas
This paper presents incorporating a metasurface to convert linear polarization to circular polarization at 60 GHz. The proposed antenna design, namely, a linear polarized DRA, is employed as original antennas for producing LP signals. According to simulation results, metasurface is capable of converting an LP signal produced at the original antenna into a CP signal, while improving the polarization bandwidth with gain. The proposed DR antenna exhibits a return loss bandwidth, axial ratio bandwidth, efficiency, and gain of 3.55%, 1.2 %, 95% and 8.6 dBi, respectively.
本文介绍了在60 GHz波段采用超表面将线偏振转换为圆偏振。提出的天线设计,即线性极化DRA,作为原始天线产生LP信号。仿真结果表明,metassurface能够将原天线处产生的LP信号转换为CP信号,并随着增益提高极化带宽。该天线的回波损耗带宽为3.55%,轴比带宽为1.2%,效率为95%,增益为8.6 dBi。
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引用次数: 0
Improved Rectifier Efficiency Using Multi-sine Input Signals 利用多正弦输入信号提高整流器效率
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9811072
Hamza Kiani, Abdul Quddious, David Chatzichristodoulou, N. Shoaib, P. Vryonides, S. Nikolaou
This paper presents the use of multi-tone signals as input signals for an ISM rectifier, that results in improved RF-to-dc efficiency when compared with a single tone signal with the same power. The implementation of a very compact and wideband rectifier allows the use of wideband multi-tone signals, with high number of tones (N up to 8) and wide frequency spacing between adjacent tones. The power distribution of the tones was both uniform and non-uniform. For the implemented rectifier, the highest RF-to-dc efficiency was 65% and was achieved with a 5-tones signal with uneven power distribution. Compared to the 50% recorded RF-to-dc efficiency that was measured for a single tone signal with equal power (0 dBm) a 30% improvement was accomplished.
本文介绍了使用多音信号作为ISM整流器的输入信号,与相同功率的单音信号相比,它可以提高RF-to-dc效率。一个非常紧凑和宽带整流器的实现允许使用宽带多音信号,具有高音调数(N高达8)和相邻音调之间的宽频率间隔。音调的力量分布既均匀又不均匀。对于所实现的整流器,最高的RF-to-dc效率为65%,并且在功率分布不均匀的5音调信号下实现。与同等功率(0 dBm)单音信号的50%记录的RF-to-dc效率相比,实现了30%的改进。
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引用次数: 0
Polarization Reconfigurable Wideband Metasurface Antenna With Low Profile 低轮廓偏振可重构宽带超表面天线
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9811073
Ahmed El Yousfi, Abdenasser Lamkaddem, K. Abdalmalak, D. Segovia-Vargas
This paper presents a low-profile single-layer metasurface antenna with reconfigurable polarization ability. The proposed design consists of 3 × 4 rectangular metasurface elements and a coplanar waveguide feeding line (CPW) which are all lying on the same substrate. The polarization reconfigurability is achieved using pin diodes that are embedded in the coplanar waveguide feeding line. Therefore, the antenna can operate in three modes: linear polarization (LP), right-handed circular polarization (RHCP), and left-handed circular polarization (LHCP). The simulated results show an impedance bandwidth (IBW) of 6% (5.55-5.9 GHz) in LP state and 17.4% (5.55-6.6 GHz) in both LHCP and RHCP states and a 3-dB axial ratio bandwidth (ARBW) of 11.3% (5.63- 6.32 GHz).
提出了一种具有可重构极化能力的低姿态单层超表面天线。提出的设计由3 × 4矩形超表面元件和共面波导馈线(CPW)组成,它们都位于同一衬底上。极化可重构性是利用嵌入在共面波导馈线中的引脚二极管实现的。因此,天线可以在线性极化(LP)、右手圆极化(RHCP)和左手圆极化(LHCP)三种模式下工作。仿真结果表明,低电压状态下的阻抗带宽(IBW)为6% (5.55 ~ 5.9 GHz),低电压和低电压状态下的阻抗带宽为17.4% (5.55 ~ 6.6 GHz), 3 db轴比带宽(ARBW)为11.3% (5.63 ~ 6.32 GHz)。
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引用次数: 0
Intelligent Reflecting Surface Orientation Optimization to Enhance the Performance of Wireless Communications Systems 智能反射面定向优化提高无线通信系统性能
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9811042
Kasun Prabhath, S. Jayaweera, S. Lane
In many intelligent reflecting surface (IRS) aided communication systems, the IRS is deployed to provide a line-of-sight (LOS) link between the transmitter and receiver. In order to maximize the efficiency of the system, deploying the IRS at the correct position and orientation is important. We propose a method to find the optimal IRS orientation that maximizes the received power or achievable rate at locations within a desired geographical area. As shown through both analytical and simulation results, the proposed methodology on optimizing IRS orientation based on the receiver or transmitter locations significantly improves the overall system performance. For example, there is an approximately 8.1 bps/Hz achievable rate improvement by installing the IRS at the optimal orientation compared to an arbitrary orientation in a typical deployment scenario.
在许多智能反射面(IRS)辅助通信系统中,IRS用于在发射器和接收器之间提供视距(LOS)链路。为了最大限度地提高系统的效率,在正确的位置和方向上部署IRS非常重要。我们提出了一种方法,以找到最佳的IRS方向,最大限度地提高接收功率或可达到的速率在一个理想的地理区域内的位置。通过分析和仿真结果表明,所提出的基于接收机或发射机位置的IRS定向优化方法显著提高了系统的整体性能。例如,与典型部署场景中的任意方向相比,在最佳方向安装IRS可以实现大约8.1 bps/Hz的速率提升。
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引用次数: 1
Metasurface Augmented Lens Antennas 超表面增强透镜天线
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9811034
D. Zelenchuk, B. Alali
In this paper the theoretical methodology of lens antennas augmented with metasurfaces is proposed and demonstrated with a 28 GHz 2D Luneburg lens. The paper presents details on a method of images to design a metasurface augmenting a lens antenna. The cases of PEC reflector and metasurface reflector are considered and a 28 GHz Luneburg lens has been simulated in CST Microwave Studio. The simulated results demonstrate successful beamsteering of a lens antenna radiation using an engineered metasurface.
本文提出了超表面增强透镜天线的理论方法,并以28ghz二维鲁讷堡透镜为例进行了验证。本文详细介绍了一种利用图像设计超表面增强透镜天线的方法。考虑了PEC反射镜和超表面反射镜的情况,并在CST微波工作室中对28ghz吕尼堡透镜进行了仿真。仿真结果表明,利用设计的超表面成功地实现了透镜天线辐射的波束导向。
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引用次数: 0
Discrete Phase Shifts for Intelligent Reflecting Surfaces in OFDM Communications OFDM通信中智能反射面的离散相移
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9810915
S.I. Hassouna, James Rains, Jalil ur Rehman Kazim, Masood Ur Rehman, M. Imran, Q. Abbasi
Reconfigurable intelligent surface (RIS) in wireless communications allows the network provider to control the scattering, reflection, and refraction characteristics of the electromagnetic signals. Different research results have shown (RIS) can effectively control the properties of the wireless waves like Amplitude and Phase without complex equalization and decoding at the receiver. Nevertheless, configuring the surface under practical frequency selective fading channel must be considered over the whole bandwidth consequently we took into consideration the wideband orthogonal frequency division multiplexing (OFDM) communication system based on practical (RIS) setup with different phase shifts per each element in the surface. We used the communication setup considered in the IEEE signal processing Cup 2021 to investigate the user data rate enhancement of such (RIS) surfaces using different discrete phase shifts with equal spacing. Simulation results have shown that the data rate improved when using high resolution of discrete phase shifts per each RIS element.
无线通信中的可重构智能表面(RIS)允许网络提供商控制电磁信号的散射、反射和折射特性。不同的研究结果表明,RIS可以有效地控制无线电波的振幅和相位等特性,而无需在接收端进行复杂的均衡和解码。然而,在实际频率选择性衰落信道下的表面配置必须考虑整个带宽,因此我们考虑了基于实际(RIS)设置的宽带正交频分复用(OFDM)通信系统,在表面中每个元素具有不同的相移。我们使用IEEE信号处理杯2021中考虑的通信设置来研究使用不同间隔的离散相移对这种(RIS)表面的用户数据速率增强。仿真结果表明,采用高分辨率的每个RIS单元的离散相移可以提高数据速率。
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引用次数: 2
MR thermometry in hyperthermia: imaging for precise therapy monitoring with the novel Universal Arch applicator 热疗中的磁共振测温:使用新型通用弓应用器进行精确治疗监测的成像
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9811093
S. Curto, Carolina Carrapico Seabra, K. Sumser, M. Paulides, G. V. van Rhoon
Maximizing the benefits of hyperthermia, as adjuvant to treatment of cancer by radiotherapy and chemotherapy, requires precise monitoring and maintain the temperature in the target region in the narrow range of 41-43°C. Invasive temperature probes provide spatially limited information and can be associated with potential risks such as haemorrhages, infections, and acute side effects. Magnetic resonance (MR) temperature imaging was developed to overcome these treatment side effects allowing a non-invasive way to monitor temperature in the full treatment volume. To take advantage of this, several MR compatible radiofrequency hyperthermia devices for clinical use have been developed. In this work, we evaluate the capabilities of the state of the art Pyrexar BSD2000-3D Universal Arch MR-compatible applicator.
热疗作为癌症放疗和化疗的辅助治疗手段,需要精确监测并将靶区温度维持在41-43°C的狭窄范围内,才能最大限度地发挥热疗的作用。侵入性温度探头提供的信息空间有限,可能与出血、感染和急性副作用等潜在风险有关。磁共振(MR)温度成像技术的发展是为了克服这些治疗副作用,允许以非侵入性的方式监测整个治疗体积的温度。为了利用这一点,已经开发了几种用于临床使用的磁共振兼容射频热疗设备。在这项工作中,我们评估了最先进的Pyrexar BSD2000-3D通用弓磁共振兼容应用器的能力。
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引用次数: 0
Image Theory Verification: Closed Metal Loops in Proximity to Finite-Size Radiators and Grounds 图像理论验证:靠近有限尺寸散热器和地面的闭合金属回路
Pub Date : 2022-05-16 DOI: 10.1109/iWAT54881.2022.9811026
M. Koohestani, M. Ramdani, R. Perdriau
With the use of a closed metal loop, a recent study proposed a methodology to analytically predict and further approximate the electromagnetic field (EMF) distribution and strength of an emitting printed circuit board, even at very large distances. The basic idea was based on small loop theory together with the existence of generated artificial sources due to mirrored image loops. This paper focuses on image theory verification using full-wave simulations, providing a detailed analysis of the produced equivalent image sources due to finite-size radiators and grounds. This study clearly highlights the reasoning behind that methodology, particularly how image theory should also be reapplied to conventional image sources, which was not explicitly elaborated in a previous paper. That makes it possible to use the analytical formulations of a loop in free space to approximate EMFs in the presence of finite size radiating conductors. For example, in automotive compliance testing where a minimum test distance of 1 m up to 10 m is required, it can avoid using costly practical setups or computationally intensive full-wave simulations.
最近的一项研究提出了一种方法,利用一个封闭的金属回路来分析预测和进一步近似一个发射印刷电路板的电磁场分布和强度,即使在非常大的距离。其基本思想是基于小环路理论以及镜像环路产生的人工源的存在。本文的重点是利用全波模拟进行图像理论验证,提供了由于有限尺寸的散热器和地面而产生的等效图像源的详细分析。这项研究清楚地强调了该方法背后的原因,特别是如何将图像理论也重新应用于传统的图像源,这在以前的论文中没有明确阐述。这使得利用自由空间中环路的解析公式来近似有限尺寸辐射导体存在时的电磁场成为可能。例如,在汽车合规性测试中,需要1米到10米的最小测试距离,它可以避免使用昂贵的实际设置或计算密集型的全波模拟。
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引用次数: 0
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2022 International Workshop on Antenna Technology (iWAT)
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