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The electro-thermal simulation of graphene nanoribbon (GNR) interconnects is presented in this paper. The Boltzmann transport equation (BTE) is solved under the relaxation time approximation (RTA). The power density, which is obtained by the Boltzmann-Poisson approach, is used as the Joule-heating source in heat conduction equation to calculate the temperature profile along the GNR. The result is...
The low noise amplifier (LNA) is a significant device in RF front-end. In this paper, a straight and efficient modeling method for LNA based on the Volterra series with recursive least squares (RLS) algorithm is proposed. Instead of calculating the high nonlinearity order of Volterra kernels, the proposed method extracts the first three order Volterra kernels characterizing the memory effect to construct...
In this letter, a multifunctional Electromagnetic Band Gap Structure (EBGS) with ultra wideband absorption and narrow band transmission properties is designed. It is constructed by two kinds of Frequency Selective Surfaces (FSSs) and a piece of dielectric spacer. The top FSS is a split square ring loaded with resistors, the middle is a dielectric spacer, the bottom is a slot ring FSS. Simulation shows...
The paper proposes a novel validity evaluation method, Improved Feature Selective Validation, in order to evaluate the uncertainty analysis results in Electromagnetic Compatibility simulation. By comparing with the questionnaire results, it is shown that the proposed method can provide more accurate evaluation than a previous method called Mean Equivalent Area Method.
This paper proposes a 2.45/5.8GHz simultaneously working dual-frequency rectenna for an integrated wireless energy harvesting system. A 2.45/5.8GHz receiving antenna is designed to receive RF (Radio Frequency) energy. To achieve a dual-frequency synchronized working rectifying circuits, a new design of 2.45/5.8GHz rectifying circuit utilizing reverse series output mode is proposed. With 0dBm input...
Since multilevel fast multipole algorithm (MLFMA) is the most effective method for the exact solution of scattering characteristics of electrically large objects, MLFMA is applied to two-dimensional sea surface scattering in high frequency (HF) band in this paper. Firstly, dynamic ocean surface modeling and incident wave form selecting are discussed, which should be considered especially for sea surface...
We study 3D printing of graphene UHF RFID antennas on a thin wood veneer substrate, subsequently cured by heat in an oven or photonically by pulsed Xenon flash. We present the read range results of the tags and test the effects of moisture on the tag performance. Initially the peak read ranges of both types of tags are about 4.5 meters. The read range decreases about 50 cm when the tag antenna and...
This paper proposes a novel algorithm for the joint estimation of DOA, range and frequency of mixed far-field and near-field sources. Based on the second order statistics of a symmetric uniform linear array, this method constructs two correlation matrices in the first step to obtain the estimates of DOA and frequency parameters. In the second step, two more correlation matrices are derived. The range...
Sequent data acquisition and imaging in traditional active millimeter-wave imaging system in market results in serious time delay, cost, and system complexity. A point-by-point imaging approach is proposed in this paper to address the issue. Imaging starts shortly after data acquisition begins and virtually simultaneously with data acquisition. Partially known image and new data are used to image...
In this paper, a reconfigurable graphene transmission array is proposed for the generation of vortex radio waves at THz. By perforating the substrate with holes of various diameters, different values of effective permittivity are obtained. The transmission coefficient can be adjusted by changing the chemical potential of graphene. With the excitation of planar wave, the phase-compensation of corresponding...
This paper presents a densely packed MIMO antenna array with high isolation. A compact resonator as a band-gap filter is designed between the two patch antennas to enhance the isolation. Thanks to this compact resonator, the isolation between two patches can reach 30dB, nearly 20dB higher than the MIMO antenna array without using decoupling network. Furthermore, he bandwidth and radiation pattern...
In this paper A wideband radar cross section (RCS) reduction structure applicable to rod-like targets on the dielectric surface is studied. The influence of dielectric surface lie chiefly with narrow frequency band with no more than 5dB. In addition, as for the typical frequency point at 9GHz, the discrepancy of RCS sweep of the multistep cylindrical structure near normal incidences between with and...
A constant voltage output independent of loads is desirable in magnetically resonant wireless power transfer (WPT) systems. Most of the magnetically resonant WPT systems developed so far do not have such a property. In this paper, we introduce compensation networks to the WPT systems and develop the conditions and parameters that allow the magnetically resonant coupling WPT systems to be of load independent.
We demonstrate a flexibly controllable molding of electromagnetic waves by designing magnetic metamaterials and metasrufaces with an array of ferrite rods under a particularly arranged bias magnetic field. The manipulation is accomplished for both the spatially propagating waves and the surface waves confined at the interface. Nonreciprocal properties associated with the magnetic surface plasmon resonance...
An omni-directional cavity backed antenna is proposed this paper. The antenna is used for space aerocraft, so the cavity backed antenna is “buried” in the platform to ensure the good fluid mechanics characters. A simple monopole is used here for good omni-direction radiation and to enlarge the radiation in the low elevation angle, a conical cavity is used. A dielectric filled gap between the conical...
The electrode constitutes the key element of the atom probe (AP) pulse signal generator. The AP parameter Monte Carlo (MC) analysis is introduced. The AP microelectrode is designed with 50-Ω loaded microstrip line centered by via hole. The excitation square wave pulse presents 300-ps duration and 1-kV amplitude. The worst cases of the signal integrity is performed with MC analysis applied to the electrode...
Wireless power transfer has been widely used in various applications and been intensively researched recently, especially after the mid-range resonant inductive coupling was proposed. Most resonant inductive coupling systems are narrowband, which limits their adaptability and application. A spherical helix is proposed for a wireless power transfer system with a wider bandwidth. The system with the...
In order to detect pipelines underground to avoid accidents in urban construction, ground penetrating radar (GPR) is applied for non-destructive evaluation. Surface integral equations are used to model the scattering properties of the underground pipes and method of moment (MoM) is used to solve the equations. Since both multi-level fast multi-pole algorithm (MLFMA) and adaptive cross approximation...
We propose a theoretical study on dual-frequency conformai antenna made by carbon nanotubes (CNTs) which is suitable to be printed on commercially available paper substrate. According to the simulation result, it is found that the radius of the conformal cylindrical surface and the conductivity of CNTs contribute little to the antenna performance. By further integrated onto the textile substrate,...
In this paper, one fast method for analyzing printed circuits based on matrix high-dimensional interpolation schemes has been presented. By virtual of the bi-interpolation on the plane of the frequency direction and the dielectric constant direction, the proposed method can greatly reduce the global time consuming of matrix fillings, and it can greatly improve the efficiency of multi-parameter scanning...
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