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2022 Microwave Mediterranean Symposium (MMS)最新文献

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Techniques for temperature-dependent dielectric measurements: a review 温度相关介电测量技术综述
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825550
Federico Cilia, S. Di Meo, L. Farrugia, J. Bonello, I. Farhat, E. Dimech, M. Pasian, C. Sammut
In this paper, a preliminary review of the dielectric measurement methods as a function of both frequency and temperature is presented. In particular, the two most popular approaches for heating the samples up to ablative temperatures (i.e., water bath and antenna applicator) and two dielectric measurement setups (i.e. open-ended coaxial probe and resonant cavity) are analysed and compared, highlighting the pros and cons of each approach.
本文对介电测量方法与频率和温度的关系作了初步综述。特别地,分析和比较了两种最流行的将样品加热到烧蚀温度的方法(即水浴和天线涂敷器)和两种介电测量装置(即开放式同轴探头和谐振腔),突出了每种方法的优缺点。
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引用次数: 0
Advances in MRI based Electrical Properties Tomography: a Comparison between Physics-supported Learning Approaches 基于MRI的电性质断层扫描的进展:物理支持学习方法的比较
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825562
S. Zumbo, S. Mandija, E. Meliadò, P. Stijnman, T. Meerbothe, C. V. D. van den Berg, T. Isernia, M. Bevacqua
Magnetic resonance imaging (MRI) is widely used in several medical applications, which include the non-invasive and in-vivo investigation of the electrical properties of biological tissues. Such kind of inverse problem can be addressed by means of iterative methods, which are time and memory consuming and solution may converge to local minima. To accelerate the reconstructions and bypass the problem of local minima, we propose and compare two different learning methods to face the inverse problem underlying the MRI based electrical properties tomography, one based on supervised descent method and the other one on a cascade of multi-layers convolutional neural networks. Both methods are trained and tested using 2D simulated data of a human head model and show a good reconstruction capability. Better generalization ability can be achieved by using the CNN-based iterative approach.
磁共振成像(MRI)广泛应用于多种医学应用,包括对生物组织电学特性的非侵入性和活体研究。这类逆问题可采用迭代法求解,但迭代法耗时耗内存,求解可能收敛于局部极小值。为了加速重建并绕过局部最小值问题,我们提出并比较了两种不同的学习方法来面对基于MRI的电性质层析成像的逆问题,一种是基于监督下降法,另一种是基于多层卷积神经网络的级联。这两种方法都通过人体头部模型的二维仿真数据进行了训练和测试,显示出良好的重建能力。采用基于cnn的迭代方法可以获得更好的泛化能力。
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引用次数: 1
Design of compact size dual-band smartwatch antenna for biomedical applications 设计用于生物医学应用的紧凑型双波段智能手表天线
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825560
Rania Rabhi, A. Gharsallah
This paper presents a compact size dual-band antenna that can be perfectly integrated into the smartwatch frame. The proposed antenna operates at 2.45 GHz and 5.8 GHz ISM bands and designed on a semi-flexible material of RT/duroid 5880 (εr = 2.2, tanδ = 0.0009) with an overall dimension of 28.5 mm × 19 mm × 1.575 mm. The final design provides a peak gain of 1.8 dB and 3.8 dB and a −10 dB impedance bandwidths of 350 MHz and 570 MHz at 2.4 GHz and 5.8 GHz respectively. The antenna is studied in free space and then on-body scenarios. The specific absorption rate (SAR) analysis in the wrist-worn have also been presented, which are under the normal SAR criteria. These features make the proposed antenna a strong candidate for healthcare applications of smartwatches.
本文提出了一种紧凑的双频天线,可以完美地集成到智能手表框架中。该天线工作在2.45 GHz和5.8 GHz ISM频段,采用半柔性材料RT/duroid 5880 (εr = 2.2, tanδ = 0.0009)设计,外形尺寸为28.5 mm × 19 mm × 1.575 mm。最终设计的峰值增益分别为1.8 dB和3.8 dB,−10 dB阻抗带宽分别为350 MHz和570 MHz,分别为2.4 GHz和5.8 GHz。在自由空间和人体场景下对天线进行了研究。同时对腕带进行了比吸收率(SAR)分析,均在正常的SAR标准范围内。这些特性使该天线成为智能手表医疗保健应用的有力候选者。
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引用次数: 1
Dielectric Characterization Improvement of Biopsy Samples Via a Coated Open-Ended Coaxial Probe 通过涂层开放式同轴探针改善活检样品的介电特性
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825517
Eliana Canicattì, N. Fontana, S. Barmada, A. Monorchio
In the present work, we investigated the dielectric characterization of cylindrical shaped tissues via an open-ended coaxial probe. So long as biological tissues are not stiff, in this contribution we look for the minimum cylinder diameter and the related insertion depth in the tissue detectable by our probe. From numerical simulations, we derived the reflection coefficient probe aperture plane, and then we used it as input data in our Virtual Transmission Line Model (VTLM) based algorithm for dielectric properties reconstruction. Furthermore, we numerically analyzed the presence of a dielectric coating which hosts the tissue under test and wraps the coaxial probe itself. The aim is exploiting the sample shape derived from a core needle biopsy procedure which allows avoiding sample manipulation. The same dielectric coating allows reducing fringing field effect at the probe-to-tissue region thus enhancing probe dielectric reconstruction properties. The proposed system can be used in medical field as a decisional support in pre-pathological malignant tissue recognition purposes.
在本工作中,我们通过开放式同轴探针研究了圆柱形组织的介电特性。只要生物组织不僵硬,在这个贡献中,我们寻找最小的圆柱体直径和相关的插入深度在我们的探针可以检测到的组织中。通过数值模拟,推导出探测孔径平面的反射系数,并将其作为基于虚拟传输线模型(Virtual Transmission Line Model, VTLM)的介电特性重构算法的输入数据。此外,我们数值分析了介质涂层的存在,介质涂层承载被测组织并包裹同轴探头本身。目的是利用从核心针活检过程中获得的样品形状,从而避免样品操作。相同的介电涂层允许减少探针到组织区域的边缘场效应,从而增强探针介电重建性能。该系统可作为病理前恶性组织识别的决策支持,应用于医学领域。
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引用次数: 4
Design and Manufacturing of Microwave Components by 3D Printing 微波元件的3D打印设计与制造
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825617
N. Delmonte, L. Silvestri, C. Tomassoni, I. Piekarz, J. Sorocki, L. Perregrini, M. Bozzi
In the field of microwave engineering, additive manufacturing technologies enable the rapid prototyping of cost-effective and light-weight components and the simple realization of otherwise impractical topologies. In this work, a technique for the creation of passive microwave components based on 3D printing of plastic material is discussed. A number of devices are presented, including a microstrip-to-waveguide transition, a dielectric sensor, and two microwave filters. Each of these components highlights the aspects that additive manufacturing can bring to their respective applications.
在微波工程领域,增材制造技术可以快速制作成本效益高、重量轻的部件,并可以简单地实现不切实际的拓扑结构。在这项工作中,讨论了一种基于塑料材料3D打印的无源微波元件的制造技术。介绍了许多器件,包括微带到波导的转换,介电传感器和两个微波滤波器。这些组件中的每一个都突出了增材制造可以为其各自的应用带来的方面。
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引用次数: 1
Ultracompact Inverted Input Delay Doherty Power Amplifier with a Novel Power Divider for 5G mm-Wave 一种新型5G毫米波分压器的超紧凑反向输入延迟多尔蒂功率放大器
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825609
Aniello Franzese, M. Wei, R. Negra, A. Malignaggi
This paper reports on the design of a Doherty power amplifier (DPA) for 5G mm-wave applications. Conversely to standard DPAs, this design presents a delay at the input of the carrier amplifier, which enhances the isolation of the peaking amplifier while the DPA is in its low power regime. Moreover, the circuit leverages a novel power divider (PD) to reduce both size and number of passive components. Moreover, the PD transforms the input impedance of the carrier and the peaking amplifiers to 50 Ω avoiding lossy matching networks. Performance consists of a peak gain without pre-driver amplifiers of more than 7 dB at 26.5 GHz, a back-off efficiency plateau of 5 dB, and a saturation power of more than 14 dBm. The circuit has been fabricated in the IHP 130-nm SiGe technology and occupies an effective area of 660×360 µm2, which makes it suitable to be integrated into a beamformer chip.
本文报道了一种5G毫米波应用的Doherty功率放大器(DPA)的设计。与标准DPA相反,该设计在载波放大器的输入端呈现延迟,从而在DPA处于低功率状态时增强了峰值放大器的隔离性。此外,该电路利用一种新颖的功率分压器(PD)来减小无源元件的尺寸和数量。此外,PD将载波和峰值放大器的输入阻抗转换为50 Ω,避免了有损匹配网络。其性能包括在26.5 GHz时无预驱动放大器的峰值增益超过7 dB,回退效率平台为5 dB,饱和功率超过14 dBm。该电路采用IHP 130纳米SiGe技术制造,有效面积为660×360µm2,适合集成到波束形成芯片中。
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引用次数: 0
Fabricating 3D Metamaterials via Field's Metal Injection 通过Field的金属注射制造3D超材料
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825596
I. Spanos, C. Stevens, A. Vallechi, J. McGhee, W. Whittow
This report presents a recently developed fabrication method combining fused deposition modelling with Field's metal for the manufacturing of complex metal structures. First, a dielectric mold is printed using standard 3D printing methods. The mold is designed with hollow cavities, which form the desired shape of the structure's metal parts. Next, molten Field's metal is injected inside, filling the cavities and adopting their architecture. Field's metal has a low melting point of 65 degrees Celsius, which can realistically be lower than the temperature where heat deformation in numerous thermoplastic materials occurs. This method can produce metamaterial resonators with high quality factors. Numerical methods are used to model the response of the metamaterial and further investigate the resonance.
本报告介绍了一种最新开发的制造方法,将熔融沉积建模与菲尔德金属相结合,用于制造复杂的金属结构。首先,使用标准的3D打印方法打印电介质模具。模具设计有空心腔,形成结构金属部件的所需形状。接下来,熔融场的金属被注入内部,填充空腔并采用它们的结构。Field的金属具有65摄氏度的低熔点,这实际上可以低于许多热塑性材料发生热变形的温度。这种方法可以生产出高质量因数的超材料谐振器。采用数值方法模拟了超材料的响应,并对共振进行了进一步研究。
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引用次数: 1
3D-Printing of Antenna-Feed Components for Space Applications 用于空间应用的天线馈电组件的3d打印
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825568
G. Addamo, O. Peverini, F. Calignano, M. Lumia, G. Virone, F. Paonessa, D. Manfredi
This paper reports an overview on the on-going research activity aimed at the exploitation of 3D-printing technologies to the development of dual-band and dual-polarization components for SatCom antenna feed chains. In particular, architectures optimized for 3D-printing are discussed, and the results of a preliminary study on the application of perforations along the internal channels is reported.
本文概述了正在进行的研究活动,旨在利用3d打印技术开发用于卫星通信天线馈电链的双频和双极化组件。特别地,讨论了针对3d打印优化的结构,并报告了沿内部通道穿孔应用的初步研究结果。
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引用次数: 1
Superdirective Array Antennas with Pattern Radiation Reconfigurable for Wi-Fi box 超指令阵列天线与模式辐射可重构Wi-Fi盒
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825579
M. M. Khouma, I. Dioum, A. Diallo, S. Ouya
This paper presents a design of a superdirective array of 3 monopoles antennas with radiation pattern reconfigurable for Wi-Fi box in ISM band. It is principally based on Uzkov's theory, who define the possibility to obtain a high directivity in order of N2 in a desired direction by linearly associating a large number of N radiators closely spaced. Since we calculated specific currents excitation in magnitude and phase to obtain a superdirectivity reconfigurable for desired direction, we design this array antennas by exciting one monopole by a unit current and loaded the others two by impedances Znload determined from uzkov's theory. This impedances are each other directly connected to its pin diode which allow to swicth in a desired direction without any mutual coupling between monopoles and cover all 360 deg of azimutal plane. This array antennas, efficient at 96%, presents approximately similar results in all 360 deg of azimtal plane with a reconfigurable directivity in order of 5.2dB and a Back lobe of −14dB with an Half Power Beam of around 120 deg in every direction.
本文提出了一种用于ISM频段Wi-Fi盒的具有可重构辐射方向图的3个单极子超指示阵列天线的设计。它主要是基于乌兹科夫的理论,他定义了在期望的方向上,通过线性关联大量紧密间隔的N个辐射体,获得高指向性的可能性。由于我们计算了特定电流激励的大小和相位,以获得在期望方向上可重构的超方向性,因此我们设计了该阵列天线,用单位电流激励一个单极子,并用由乌兹科夫理论确定的阻抗Znload加载其他两个单极子。这些阻抗彼此直接连接到其引脚二极管,允许在所需的方向上切换,而没有单极子之间的任何相互耦合,并覆盖所有360度的方位面。该阵列天线的效率为96%,在所有360度方位面上的结果近似相似,可重构指向性为5.2dB,后瓣为- 14dB,每个方向的半功率波束约为120度。
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引用次数: 0
Integration of Modulated Scattering Technique (MST) tags with IoT devices 调制散射技术(MST)标签与物联网设备的集成
Pub Date : 2022-05-09 DOI: 10.1109/mms55062.2022.9825565
M. Manekiya, M. Donelli, V. Mulloni, Giada Marchi
Internet of things (IoT) has transformed numerous fields while providing better connectivity. In such scenario, the integration of various IoT devices have to be satisfied. The downside of commuting between cross platform IoT devices are difficult to achieve, because low power high range communication front end is mandatory. This paper proposes to utilize the Modulated Scattering Technique (MST) to integrate with IoT devices and to achieve the radio frequency communication capabilities. An MST system works similarly to an RFID, is highly miniaturized and exhibits good performances at microwave frequency bands without the necessity of radio frequency front-end. MST communication systems provide an high operative range with respect to standard RFID systems, and a very low consumption with respect to standard wireless radio frequency front ends, such as WiFi modules. This work proposes the integration of MST communication paradigms with an IoT system, in particular a prototype of air quality IoT sensor is presented and assessed.
物联网(IoT)在提供更好的连接的同时改变了许多领域。在这种情况下,必须满足各种物联网设备的集成。跨平台物联网设备之间通信的缺点是难以实现,因为低功耗高范围通信前端是强制性的。本文提出利用调制散射技术(MST)与物联网设备集成,实现射频通信能力。MST系统的工作原理与RFID类似,高度小型化,无需射频前端,在微波频段表现出良好的性能。与标准RFID系统相比,MST通信系统提供了较高的工作范围,与标准无线射频前端(如WiFi模块)相比,MST通信系统的功耗非常低。这项工作提出了MST通信范式与物联网系统的集成,特别是提出并评估了空气质量物联网传感器的原型。
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引用次数: 0
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2022 Microwave Mediterranean Symposium (MMS)
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