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Octa-port High Gain MIMO Antenna Backed with EBG for mm-Wave Applications 八端口高增益MIMO天线支持EBG毫米波应用
Q3 Engineering Pub Date : 2023-01-01 DOI: 10.2528/pierb23082301
Nallagundla Suresh Babu, Abdul Quaiyum Ansari, Sachin Kumar, Binod Kumar Kanaujia, Ghanshyam Singh, Bhawna Goyal
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引用次数: 0
Full Wave Modeling of Electromagnetic Scattering by an Object buried between two Rough Surfaces: Application to GPR 埋在两个粗糙表面之间的物体电磁散射的全波模拟:在探地雷达中的应用
Q3 Engineering Pub Date : 2021-07-09 DOI: 10.36227/techrxiv.14925324
Marc E. Songolo, N. Pinel, C. Bourlier
In this paper, we present an efficient numerical method to calculate the frequency and time responses of the field scattered by an object buried between two random rough surfaces. This method is called Generalized PILE (GPILE) method because it extends the PILE method which considers only two surfaces or an object buried under a surface. The GPILE method solves rigourously the Maxwell equations by using a simple matrix formulation. The obtained results have a straightforward physical interpretation and allow us to investigate the influence of the object buried between the two rough surfaces. We distinguish the primary echo of the upper surface, the multiple echoes coming from the lower surface and those arising from the object. The GPILE method is applied to simulate the Ground Penetrating Radar (GPR) signal at nadir. The resulting time response helps the user to detect the presence of the object buried between the two random rough surfaces.
本文提出了一种有效的数值方法来计算埋在两个随机粗糙表面之间的物体散射场的频率和时间响应。这种方法被称为广义桩(GPILE)方法,因为它扩展了只考虑两个表面或埋在一个表面下的物体的PILE方法。GPILE方法采用简单的矩阵形式严格求解麦克斯韦方程组。得到的结果有一个简单的物理解释,并允许我们研究埋在两个粗糙表面之间的物体的影响。我们区分了上表面的一次回波、下表面的多次回波和物体产生的回波。应用GPILE方法对探地雷达(GPR)信号在最低点进行模拟。由此产生的时间响应有助于用户检测隐藏在两个随机粗糙表面之间的物体的存在。
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引用次数: 1
HARDWARE ENABLED ACCELERATION OF NEAR-FIELD CODED APERTURE RADAR PHYSICAL MODEL FOR MILLIMETRE-WAVE COMPUTATIONAL IMAGING 毫米波计算成像近场编码孔径雷达物理模型的硬件加速
Q3 Engineering Pub Date : 2021-01-08 DOI: 10.2528/PIERB20112305
Rahul Sharma, O. Yurduseven, B. Deka, V. Fusco
There is an increasing demand in real-time imagery applications such as rapid response to disaster rescue and security screening to name a few. The throughput of a radar imaging system is mainly controlled by two parameters; data acquisition time and signal processing time. To minimize the data acquisition time, various methods are being tried and tested by researchers worldwide. Among them is the computational imaging (CI) technique, which relies on using coded apertures to encode the radar back-scattered measurements onto a set of spatio-temporally incoherent radiation patterns. Such a CI-based imaging approach eliminates the requirement for a raster scan and can substantially simplify the physical hardware architecture. Equally important is the processing time needed to retrieve the scene information from the coded back-scattered measurements. In CI, the simplification in the hardware layer comes at the cost of increased complexity in the signal processing layer due to the indirect mapping and compression of the scene information through the spatio-temporally incoherent transfer function of the coded apertures. To address this particular challenge, this paper presents a hardware-based solution for CI signal processing using a Field Programmable Gate Array (an Xilinx Virtex-7 (XC7VX485T) FPGA chip) architecture. In particular, the proposed method consists of calculating the CI sensing matrix using the FPGA chip and storing it on the FPGA platform for image reconstruction. For the adjoint operation, the calculated sensing matrix is applied on the measured back-scattered waves from the target object. We demonstrate that the FPGA based calculation can reach 21.9 times faster speed than conventional brute-force solutions.
实时图像应用的需求不断增加,例如对灾难救援和安全检查的快速反应。雷达成像系统的吞吐量主要由两个参数控制;数据采集时间和信号处理时间。为了最大限度地减少数据采集时间,世界各地的研究人员正在尝试和测试各种方法。其中计算成像(CI)技术是利用编码孔径将雷达后向散射测量值编码为一组时空非相干辐射图。这种基于ci的成像方法消除了对光栅扫描的需求,并且可以大大简化物理硬件架构。同样重要的是,从编码后向散射测量中检索场景信息所需的处理时间。在CI中,硬件层的简化是以增加信号处理层的复杂性为代价的,因为通过编码孔径的时空非相干传递函数间接映射和压缩场景信息。为了解决这一特殊挑战,本文提出了一种基于硬件的CI信号处理解决方案,使用现场可编程门阵列(Xilinx Virtex-7 (XC7VX485T) FPGA芯片)架构。具体而言,该方法是利用FPGA芯片计算CI传感矩阵并将其存储在FPGA平台上进行图像重建。对于伴随运算,计算出的传感矩阵应用于测量到的目标物体的后向散射波。我们证明了基于FPGA的计算速度比传统的暴力破解方案快21.9倍。
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引用次数: 12
Topological Circuit Theory: A Lie Group Perspective 拓扑电路理论:李群的观点
Q3 Engineering Pub Date : 2020-11-05 DOI: 10.36227/techrxiv.13174718.v1
S. Mikki
We propose a new general framework attempting a unification of circuit and quantum theories. The theory is based on our discovery of a common Lie-group-theoretic structure shared by continuous circuits and quantum systems. Applications are proposed by applying topology to selected problems in microwave network theory.
我们提出了一个新的通用框架,试图将电路理论和量子理论统一起来。该理论是基于我们发现了连续电路和量子系统共享的一种常见的李群论结构。通过将拓扑应用于微波网络理论中的选定问题,提出了应用。
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引用次数: 0
Electromagnetic Field Theory for Invariant Beams Using Scalar Potentials 利用标量势的不变光束电磁场理论
Q3 Engineering Pub Date : 2020-08-07 DOI: 10.2528/PIERB15123102
I. Rondón, F. Soto-Eguibar
We present a description of the electromagnetic field for propagation invariant beams using scalar potentials. Fundamental dynamical quantities are obtained: energy density, Poynting vector and Maxwell stress tensor. As an example, all these quantities are explicitly calculated for the Bessel beams, which are invariant beams with circular cylindrical symmetry.
我们用标量势描述了传播不变光束的电磁场。得到了基本的动力学量:能量密度、坡印廷矢量和麦克斯韦应力张量。例如,所有这些量都是为贝塞尔光束明确计算的,贝塞尔光束是具有圆柱对称性的不变光束。
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引用次数: 3
CAPACITANCE MATRIX REVISITED 重测电容矩阵
Q3 Engineering Pub Date : 2020-07-20 DOI: 10.2528/PIERB21011501
I. Smoli'c, B. Klajn
The capacitance matrix relates the potentials and the charges on a system of conductors. We review and rigorously generalize its properties, block-diagonal structure, inequalities and regularity, deduced from the geometry of the system of conductors and analytic properties of the permittivity tensor. Furthermore, we discuss alternative choices of regularization of the capacitance matrix, which allows us to find the charge exchanged between the conductors having been brought to equal potential. Finally, we discuss the approximations utilized in calculations of the capacitance of capacitors connected in parallel and series.
电容矩阵表示导体系统上的电位和电荷。我们回顾并严格推广了它的性质,从导体系统的几何推导出的块对角线结构、不等式和正则性,以及介电常数张量的解析性质。此外,我们讨论了电容矩阵正则化的备选选择,这使我们能够发现导体之间交换的电荷已被带到等电位。最后,我们讨论了用于计算并联和串联电容器电容的近似方法。
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引用次数: 2
PERMITTIVITY MEASUREMENTS OF BIOLOGICAL SAMPLES BY AN OPEN-ENDED COAXIAL LINE 用开放式同轴线测量生物样品的介电常数
Q3 Engineering Pub Date : 2020-07-14 DOI: 10.2528/PIERB12022906
J. Bobowski, T. Johnson
We previously reported on the complex permittivity and dc conductivity of waste-activated sludge. The measurements, spanning a frequency range of 3MHz to 40GHz, were made using an open-ended coaxial transmission line. Although this technique is well established in the literature, we found that it was necessary to combine methods from several papers to use the open-ended coaxial probe to reliably characterize biological samples having a high dc conductivity. Here, we provide a set of detailed and practical guidelines that can be used to determine the permittivity and conductivity of biological samples over a broad frequency range. Due to the electrode polarization efiect, low frequency measurements of conducting samples require corrections to extract the intrinsic electrical properties. We describe one practical correction scheme and verify its reliability using a control sample.
我们以前报道过废弃活性污泥的复介电常数和直流电导率。测量范围从3MHz到40GHz,使用开放式同轴传输线进行。尽管这项技术在文献中已经得到了很好的证实,但我们发现有必要结合几篇论文中的方法,使用开放式同轴探针来可靠地表征具有高直流电导率的生物样品。在这里,我们提供了一套详细实用的指南,可用于确定生物样品在宽频率范围内的介电常数和电导率。由于电极极化效应,导电样品的低频测量需要校正以提取固有的电学性质。我们描述了一种实用的校正方案,并使用控制样本验证了其可靠性。
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引用次数: 79
OPTIMIZING HEATING EFFICIENCY OF HYPERTHERMIA: SPECIFIC LOSS POWER OF MAGNETIC SPHERE COMPOSED OF SUPERPARAMAGNETIC NANOPARTICLES 优化热疗的加热效率:超顺磁性纳米颗粒组成的磁球的比损失功率
Q3 Engineering Pub Date : 2020-03-09 DOI: 10.2528/pierb19121702
M. Halgamuge, Ta Song
Magnetic nanoparticle (MNP) based thermal therapies have shown importance in clinical applications. However, it lacks a compromise between its robustness and limitations. We developed theoretical strategies to enhance the heating efficiency, which could be utilized in thermal therapies and calculated parameter dependence for superparamagnetic MNPs (approximative ellipsoid-shaped) within a sphere-shaped ball. Then we calculated specific loss power (SLP) for magnetic particles in a magnetic ball. The dependency of features of the nanoparticles (such as mean particle size, a number of particles, frequency and amplitude of the exposed field, relaxation time, and volume gap between particles and a sphere-shaped ball) on the SLP or the heating effect in superparamagnetic MNPs was analyzed. In this study, optimal parameter values were calculated using Kneedle Algorithm as the optimization technique to represent the accurate heating efficiency. The influence of a number of particles in a sphere-shaped ball shows that SLP of magnetic particles increases with the increasing number of particles (N); however, after N = 10 particles, the SLP increment is insignificant. The most remarkable result arising from this analysis is that when particles are closer together (less volume gap of a sphere-shaped ball), high SLP is found for the same number of particles. This model also predicts that the frequency dependency on the SLP is negligible when the frequency is higher than 10 kHz depending on the size of a sphere-shaped ball and nanoparticle parameters. This analysis has shown that the SLP of MNPs, in a sphere-shaped ball, strongly depends on magnetic parameters and properties of the particles. In brief, we have demonstrated, for the first time, impact on SLP of the accumulation of ellipsoid-shaped superparamagnetic nanoparticles into a sphere-shaped ball. This finding has essential suggestions for developing links between heating properties with loose aggregate and dense aggregate scenarios in the superparamagnetic condition.
基于磁性纳米粒子(MNP)的热疗法在临床应用中显示出重要的意义。然而,它缺乏健壮性和局限性之间的折衷。我们开发了提高加热效率的理论策略,可用于球形球内超顺磁MNPs(近似椭球形)的热治疗和计算参数依赖性。然后计算了磁球中磁粒子的比损耗功率(SLP)。分析了纳米粒子的平均粒径、粒子数、暴露场的频率和振幅、弛豫时间、粒子与球形球之间的体积间隙等特征对超顺磁MNPs中SLP或热效应的影响。在本研究中,采用Kneedle算法作为优化技术计算最优参数值,以表示精确的加热效率。球形球中粒子数的影响表明,磁性粒子的SLP随粒子数(N)的增加而增加;但在N = 10个粒子后,SLP增量不显著。通过分析得出的最显著的结果是,当粒子之间的距离更近时(球形球的体积间隙更小),相同数量的粒子具有较高的SLP。该模型还预测,当频率高于10 kHz时,取决于球形球的大小和纳米颗粒参数,频率对SLP的依赖性可以忽略不计。这一分析表明,在球形球中,MNPs的SLP强烈依赖于粒子的磁性参数和性质。简而言之,我们首次证明了椭球形超顺磁性纳米颗粒堆积成球形球对SLP的影响。这一发现为在超顺磁条件下松散骨料和致密骨料的加热性能之间建立联系提供了重要建议。
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引用次数: 4
AN EMPIRICAL MODEL OF THE EFFECTS OF IONOSPHERIC ELECTRON DENSITY VARIATIONS ON HF RADAR PROCESSING 电离层电子密度变化对高频雷达处理影响的经验模型
Q3 Engineering Pub Date : 2019-07-11 DOI: 10.2528/PIERB19040204
Marie José Abi Akl, F. Jangal, M. Darces, M. Hélier
The High Frequency hybrid radar mode combines sky and surface wave propagation. As all High Frequency radars, it can be impacted by ionospheric instabilities. A behavioral model able to include ionospheric spatial and temporal variations has been implemented to estimate the impact of ionospheric irregularities on radar signal processing and Doppler-distance images. In this work, probabilistic models of the ionospheric fluctuations in the ray tracing have been introduced using the phase path fluctuation only. Based on Shkarofsky’s spectral power density, random variations on some parameters of Booker’s electron density profile have been performed to generate disturbed electron density profiles. Afterwards, a propagation delay, integrated in the received radar signal, has been calculated in terms of phase path variation. Moreover, the temporal aspect of the ionospheric variations has been macroscopically implemented by a filtering step according to the Total Electron Content variation. Results of this simulation are presented with the corresponding statistics. Doppler and distance distributions have been computed for several filter cut-off frequency values and for different Shkarofsky’s spectral power density parameters. At last, the process described above works properly: its results have been successfully compared with actual radar data for this purpose.
高频混合雷达模式结合了天波和地波的传播。与所有高频雷达一样,它也会受到电离层不稳定性的影响。已经实现了一个能够包括电离层空间和时间变化的行为模型,以估计电离层不规则性对雷达信号处理和多普勒距离图像的影响。在这项工作中,仅使用相位路径波动引入了射线追踪中电离层波动的概率模型。基于Shkarofsky的谱功率密度,对Booker电子密度分布的一些参数进行了随机变化,产生了扰动的电子密度分布。然后,根据相位路径变化来计算在接收到的雷达信号中积分的传播延迟。此外,电离层变化的时间方面已经通过根据总电子含量变化的滤波步骤宏观地实现。该模拟的结果与相应的统计数据一起给出。已经计算了几个滤波器截止频率值和不同Shkarofsky谱功率密度参数的多普勒和距离分布。最后,上述过程正常工作:其结果已成功地与实际雷达数据进行了比较。
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引用次数: 1
AC INDUCED CORROSION ASSESSMENT OF BURIED PIPELINES NEAR HVTLS: A CASE STUDY OF SOUTH AFRICA HVTLS附近埋地管道的交流腐蚀评价&以南非为例
Q3 Engineering Pub Date : 2018-06-01 DOI: 10.2528/PIERB18040503
K. Adedeji, A. Ponnle, B. Abe, A. Jimoh, A. Abu-Mahfouz, Y. Hamam
Metallic pipelines have attendant problems of alternating current (AC) assisted corrosion when installed in the utility corridor with high voltage transmission lines. Research studies in the past and recent years have shown that this corrosion is a primary function of the AC density through the pipe coating defect. While several other AC corrosion risk assessment indices have been proposed, the AC density is regarded as a valuable parameter in assessing pipeline corrosion risk due to AC interference. Also, there exists a threshold value which, if exceeded, guarantees the possibility of pipeline corrosion damage. However, for buried pipelines, monitoring these AC corrosion assessment indices is a major challenge. Therefore, to avoid severe corrosion damage to such pipelines, a corrosion assessment for evaluating the corrosion risk of the pipelines due to AC interference is presented in this paper. The assessment was demonstrated on a buried pipeline in one of the Rand Water sites, South Africa where AC interference is frequent. The overall simulation results yield useful information which may be essential for pipeline operators, most especially Rand Water, South Africa and corrosion engineers for AC corrosion assessment of metallic pipelines installed near transmission lines. The analysis presented in this paper may also be used for the evaluation of a safe position for installing new pipelines near existing power lines right-of-way.
当金属管道安装在具有高压输电线路的公用设施走廊中时,伴随着交流(AC)辅助腐蚀的问题。过去和近年来的研究表明,这种腐蚀是通过管道涂层缺陷产生的交流密度的主要函数。虽然已经提出了其他几种交流腐蚀风险评估指标,但交流密度被认为是评估交流干扰导致的管道腐蚀风险的一个有价值的参数。此外,存在一个阈值,如果超过该阈值,则保证管道腐蚀损坏的可能性。然而,对于埋地管道来说,监测这些交流腐蚀评估指标是一个重大挑战。因此,为了避免对此类管道造成严重的腐蚀损伤,本文提出了一种腐蚀评估方法,用于评估交流干扰对管道的腐蚀风险。该评估是在南非兰德水务公司的一个地下管道上进行的,那里的交流干扰很频繁。总体模拟结果产生了有用的信息,这些信息可能对管道运营商至关重要,尤其是南非兰德水务公司和腐蚀工程师对安装在输电线路附近的金属管道进行交流腐蚀评估。本文中的分析也可用于评估在现有电力线路用地附近安装新管道的安全位置。
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引用次数: 5
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Progress In Electromagnetics Research B
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