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2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)最新文献

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Broadband and High-Gain Circularly Polarized Antenna by Using EBG Structures 基于EBG结构的宽带高增益圆极化天线
Zi-Jian Han, Yong-Xin Zhou, R. Pan, Song Yue, Xiang Li, Chuanbing Wang, X. Qi, K. Shi, Xiangjun Song
A broadband and high-gain circularly polarized antenna based on electromagnetic band gap (EBG) structures is proposed by analyzing the influence of EBG layouts on antenna performances. Compared with the reference circularly polarized antenna, the impedance bandwidth, the axial ratio bandwidth and the broadside gain of the proposed EBG antenna are significantly improved. In addition, the method of optimizing the layout of EBG structures provides a general strategy for designing broadband and high-gain EBG antenna.
通过分析电磁带隙结构对天线性能的影响,提出了一种基于带隙结构的宽带高增益圆极化天线。与参考圆极化天线相比,该天线的阻抗带宽、轴比带宽和宽侧增益均有显著提高。此外,本文提出的结构布局优化方法为设计宽带高增益电阻抗天线提供了一种通用策略。
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引用次数: 1
Multiphysics Modeling of CMOS Fully Integrated 2.58 THz Thermal Detector CMOS全集成2.58太赫兹热探测器的多物理场建模
Xu Wang, Mengjie Li, Z. Li
Terahertz (THz) detectors have shown attractive prospects in the areas of THz sensing and imaging. This paper presents the multi-physics modeling of an on-chip octagonal ring antenna loaded with a polysilicon resistor coupled with a sensitive proportional to absolute temperature (PTAT) sensor using a 55 nm CMOS process, leading to an uncooled monolithic resonant CMOS fully integrated THz thermal detector. The theoretical analysis, multi-physics modeling, and experimental verification of the detector are presented in detail. The maximum responsivity is 38.04 V/W with a noise equivalent power (NEP) of 2.89 μW/Hz0.5 at 2.58 THz for the THz source and an existing atmospheric window, and it has the natural scalability to focal plane arrays, showing great potentials for uncooled, compact, low-cost, easy- integration, and mass-production THz detection systems.
太赫兹(THz)探测器在太赫兹传感和成像领域显示出诱人的前景。本文采用55 nm CMOS工艺,对加载多晶硅电阻和敏感的比例绝对温度(PTAT)传感器的片上八角形环形天线进行了多物理场建模,从而实现了非冷却单片谐振CMOS完全集成太赫兹热探测器。详细介绍了该探测器的理论分析、多物理场建模和实验验证。太赫兹源和现有大气窗口在2.58太赫兹时的最大响应度为38.04 V/W,噪声等效功率(NEP)为2.89 μW/Hz0.5,具有焦平面阵列的天然可扩展性,在非冷却、紧凑、低成本、易于集成和批量生产的太赫兹探测系统中具有很大的潜力。
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引用次数: 0
InP HBT Small Signal Modeling based on Artificial Neural Network for Millimeter-wave Application 基于人工神经网络的毫米波小信号建模
A. Zhang, Jianjun Gao
InP heterojunction bipolar transistor (HBT) small signal modeling technique based on artificial neural network(ANN) is proposed in this paper. Two ANN models with different outputs form are given and compared. In the frequency range of 2-110 GHz, good agreements between the measured and model-calculated data can be achieved to demonstrate that the ANN model outputs with complex numbers form is more accurate than amplitude-phase form.
提出了基于人工神经网络(ANN)的InP异质结双极晶体管(HBT)小信号建模技术。给出了两种不同输出形式的人工神经网络模型并进行了比较。在2 ~ 110 GHz频率范围内,实测数据与模型计算数据吻合较好,证明了复数形式的人工神经网络模型输出比幅相形式输出更准确。
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引用次数: 1
Ocean Waves Inversion Based on Airborne Radar Images with Small Incident Angle 基于机载雷达小入射角图像的海浪反演
Daozhong Sun, Yunhua Wang, Yining Bai, Yanmin Zhang
The interferometric radar imaging altimeter is one of the main payloads of the "Guanlan" ocean science satellite proposed by the National Laboratory for Marine Science and Technology of China. To evaluate the accuracy of the interferometric radar imaging altimeter in retrieving the ocean dynamic parameters, such as sea surface height (SSH), significant wave height (SWH), an airborne interferometric radar imaging altimeter experiment was carried out at Qingdao Xiaomaidao (XMD) sea area on March 31, 2019. In the research work of this paper, SSH and SWH have been retrieved based on the interferograms acquired by the airborne interferometric radar imaging altimeter. The comparisons of the retrieved SWH with the buoy measurements, and the results demonstrate that the difference is small. In addition, the retrieved results also demonstrate that the incident angle error is an important factor affects the accuracy of the retrieved SSH. When the incident angle error is 1°, it can cause a relative error of about 40% at the near range. Through this study, it can be concluded that the interferometric radar imaging altimeter images of "Guanlan" satellite in future can effectively retrieve some ocean wave information.
干涉雷达成像高度计是中国海洋科学技术国家实验室提出的“观澜”海洋科学卫星的主要载荷之一。为评估干涉雷达成像高度计反演海面高度(SSH)、有效波高(SWH)等海洋动力参数的精度,于2019年3月31日在青岛小买岛(XMD)海域进行了机载干涉雷达成像高度计实验。在本文的研究工作中,基于机载干涉雷达成像高度计获取的干涉图,反演了地表高度和地表高度。通过与浮标实测数据的比较,发现两者的差异很小。此外,检索结果还表明,入射角误差是影响检索到的SSH精度的重要因素。当入射角误差为1°时,在近距离会造成40%左右的相对误差。通过本研究可以得出结论,未来“观澜”号卫星干涉雷达成像高度计图像可以有效检索部分海浪信息。
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引用次数: 1
Electromagnetic Environment Effects and Protection of Complex Electronic Information Systems 复杂电子信息系统的电磁环境效应与防护
Qi-Feng Liu, Shengquan Zheng, Y. Zuo, Huai-Qing Zhang, Jing-Wei Liu
With the development of science and technology and military strategy, the equipment platform will widely adopt new technologies such as stealth, radio frequency integration, integrated superstructure, as well as new system information systems and directed energy technology applications, etc., to meet the platform performance and system combat capabilities. The complex equipment platform will face the electromagnetic environment adaptability problem caused by the electromagnetic environment such as the platform, the formation system, the battlefield strong electromagnetic pulse environment. In particular, the strong electromagnetic pulse environment belongs to a high-power electromagnetic environment, and its energy is very large, which will pose a serious threat to modern information systems. To this end, this paper addresses the challenges faced by electronic information systems in dealing with the effects of electromagnetic environment, expounds the connotation of complex electromagnetic environment, analyzes the coupling mechanism of strong electromagnetic pulse environment and electronic information system, and explores the multi-physics damage mechanism of sensitive parts of electronic information system , Introduces the current commonly used electromagnetic protection and new electromagnetic protection methods, and puts forward suggestions for electromagnetic protection.
随着科学技术和军事战略的发展,装备平台将广泛采用隐身、射频一体化、上层建筑一体化等新技术,以及新系统信息系统和定向能技术应用等,以满足平台性能和系统作战能力的要求。复杂装备平台将面临平台、编队系统、战场强电磁脉冲环境等电磁环境所带来的电磁环境适应性问题。特别是强电磁脉冲环境属于大功率电磁环境,其能量非常大,将对现代信息系统构成严重威胁。为此,本文论述了电子信息系统在应对电磁环境影响方面面临的挑战,阐述了复杂电磁环境的内涵,分析了强电磁脉冲环境与电子信息系统的耦合机理,探讨了电子信息系统敏感部件的多物理场损伤机理。介绍了目前常用的电磁保护和新的电磁保护方法,并对电磁保护提出了建议。
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引用次数: 2
Conformal spherical array pattern synthesis based on CMA-ES Algorithm 基于CMA-ES算法的共形球阵方向图合成
Z. Zhang, P. Gu, G. Wang, D. Ding, R. Chen
In this paper, an efficient optimization algorithm based on the covariance matrix adaptation evolution strategy(CMA-ES), is proposed for the synthesis of conformal spherical arrays. The isolated element pattern defined in the local coordinate system is transformed to the global coordinate system by Euler rotation. The pattern of the array can be obtained applying the superposition principle. The excitation weight is optimized by CMA-ES to meet the requirements of low sidelobe pattern. Numerical experimental results demonstrate the effectiveness of the proposed method.
本文提出了一种基于协方差矩阵自适应进化策略(CMA-ES)的高效共形球阵综合优化算法。在局部坐标系中定义的孤立元素模式通过欧拉旋转转换到全局坐标系中。利用叠加原理可以得到阵列的方向图。利用CMA-ES对激励权值进行优化,以满足低旁瓣方向图的要求。数值实验结果验证了该方法的有效性。
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引用次数: 0
Large-Scale Parallel DGTD and FETD Method for Transient Microwave Heating 瞬态微波加热的大规模并联DGTD和FETD方法
Panpan Wang, Peiyu Chen, W. E. Sha, H. Zhang
With the increase of frequency and power, thermal management becomes more and more important in the design and application of RF and microwave circuits. In this paper, the microwave heating problem is studied. The discontinuous Galerkin time-domain (DGTD) method is adopted for EM simulation, while the finite-element time-domain (FETD) method is utilized for thermal simulation. The large-scale MPI parallel programming technique is used to accelerate both the DGTD and FETD method. Numerical examples are given to demonstrate the accuracy and efficiency of the proposed method.
随着频率和功率的增加,热管理在射频和微波电路的设计和应用中变得越来越重要。本文对微波加热问题进行了研究。电磁模拟采用不连续伽辽金时域(DGTD)方法,热模拟采用有限元时域(FETD)方法。采用大规模MPI并行编程技术对DGTD和FETD方法进行加速。数值算例验证了该方法的准确性和有效性。
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引用次数: 0
Efficient inversion for complex structures using domain decomposition based IE modeling 基于IE建模的领域分解的复杂结构高效反演
Jinghe Li, N. Feng, Xianglin Wu, Mengkun Ran, Tong Mu
A efficient inversion is proposed by using domain decomposition based IE modeling with incorporating the pure contrast source inversion (DDIE-CSI) for complex structures. Firstly, a new rule is defined according to an induction coefficient with the topographic relief situation. With the reference model, background medium and the distribution of target body medium area, then the computational domain consisting of the target body, background medium and complex structure is decomposed. Gaussian filtering based Anderson’s algorithm is used to calculate the primary field from the excited sources. The stable double conjugate gradient-fast Fourier transform incorporated based integral equation algorithm is applied to obtain the complex structure electromagnetic responses fast. Then DDIE-CSI is applied to some 2.5D imaging problems with complex terrain. The efficiency of the new algorithm is demonstrated by comparing with the published results of 3D boundary integral equation. Finally, the imaging results and the electromagnetic field response of complex structure under the surface and well electromagnetic observation systems are analyzed.
针对复杂结构,提出了一种基于领域分解的IE建模方法,并结合纯对比源反演(DDIE-CSI)进行高效反演。首先,根据地形起伏情况的感应系数定义新的规律;利用参考模型、背景介质和目标体介质面积分布,对目标体、背景介质和复杂结构组成的计算域进行分解。采用基于高斯滤波的安德森算法计算受激源的主场。采用基于积分方程的稳定双共轭梯度快速傅里叶变换合并算法快速获取复杂结构的电磁响应。然后将DDIE-CSI应用于一些复杂地形的2.5D成像问题。通过与已发表的三维边界积分方程计算结果的比较,证明了新算法的有效性。最后,对地表下复杂结构和井内电磁观测系统的成像结果和电磁场响应进行了分析。
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引用次数: 0
Circular Flat-top Beam Pattern Synthesis of a Rotated Sparse Planar Dipole Array with Minimum Element Spacing Constraint 最小单元间距约束下旋转稀疏平面偶极子阵列圆形平顶波束图合成
Foxiang Liu, Wei Zheng, Liyang Chen, Yanhui Liu
This paper achieves the circular flat-top beam pattern synthesis of a uniform amplitude sparse planar dipole array by joint optimization of element rotations, positions and phases. Moreover, the minimum element spacing constraint for the synthesized array is considered by using an asymmetry mapping method (AMM). Importantly, on the basis of obtaining an equivalent or better pattern performance, the synthesized array can save 33.06% elements and avoid the usage of unequal power dividers than published results.
本文通过单元旋转、位置和相位的联合优化,实现了均匀振幅稀疏平面偶极子阵列的圆形平顶波束图合成。此外,采用非对称映射法考虑了合成阵列的最小单元间距约束。重要的是,在获得等效或更好的方向图性能的基础上,合成阵列比已发表的结果节省了33.06%的单元,避免了不均匀功率分配器的使用。
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引用次数: 0
Modeling and Simulation of an Antenna-Coupled Image-Reject High-Temperature Superconducting Terahertz Receiver 天线耦合抗像高温超导太赫兹接收机的建模与仿真
Xiang Gao, Jianping An, Xiangyuan Bu
This paper presents systematical design, modeling and simulation of an antenna-coupled image-reject high-temperature superconducting (HTS) receiver for terahertz (THz) wireless communication applications. The receiver features an innovative quasi-optical quadrature RF hybrid design comprised of a meta-surface based circular polarizer and a dual-polarized integrated lens antenna fed by two HTS Josephson junctions. Besides, a fully monolithic HTS receiver circuit including on-chip bias tees and quadrature IF hybrid networks, is designed for combining the frequency down-converted signals from the junctions. Detailed numerical modelling and simulations are carried out for optimizing the electromagnetic designs as well as verifying the concept and performance of our presented image-reject HTS THz receiver. The receiver will find huge potential in THz wireless communication systems.
介绍了一种用于太赫兹无线通信的天线耦合图像抑制高温超导接收机的系统设计、建模和仿真。该接收机采用创新的准光学正交射频混合设计,由基于元表面的圆偏振器和由两个高温超导约瑟夫森结馈电的双偏振集成透镜天线组成。此外,还设计了包含片上偏置三通和正交中频混合网络的全单片高温超导接收电路,用于组合来自这些接点的频率下变频信号。详细的数值模拟和仿真进行了优化电磁设计,并验证了我们提出的图像抑制HTS太赫兹接收机的概念和性能。该接收机在太赫兹无线通信系统中具有巨大的应用潜力。
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引用次数: 0
期刊
2020 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO)
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