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Nb5N6 bolometer is a high sensitive terahertz detector at room temperature. The core part of traditional Nb5N6 bolometer is microbridge with a typical size of 3 μm × 12 μm. We have recently proposed a method using electron beam lithography (EBL) instead of UV lithography on fabrication of Nb5N6 micro bridge, which will reduce the size of the micro-bridge one to two orders of magnitude, the minimum...
We design a T-shape structure reflecting mirror covered a gold thin film on the high-resistivity silicon substrate (ρ=1000 Ω·Cm) for the detector array. The electric field distribution of the T-shape structure is simulated by using finite difference time domain (FDTD) solutions in the frequency range from 300 GHz to 400 GHz. The electric field can be gathered in the central area of the silicon substrate...
Haptic refers to feedback of a physical signal to a human user through touch. A haptic system realizes this feedback. In most of the applications today, the physical signal refers to force but not necessary. Virtual environment haptic systems refers to the situation where the force to be feedback from the objects in a virtual environment or computer. Virtual environment haptic robotic systems are...
We report on the influence of substrate thickness on the performance of antenna coupled microbolometers for terahertz (THz) detection. Planar antennas with NbsNó microbolometers were fabricated on silicon substrates. Detected voltages of these antenna-coupled microbolometers are altered with a periodic variation from 0.5 THz to 0.75 THz, which is accorded with the reflection of the substrate. By placing...
We present an antenna-coupled 1 × 64 Nb5N6 microbolometer array detectors for real-time terahertz (THz) imaging. The intrinsic average responsivity of the detectors in the array is 650 V/W, and the corresponding noise equivalent power (NEP) is 17 pW/√Hz. The array chip is combined with a low noise readout circuit with 64 channels. The array detector was preliminary used for THz source imaging, and...
Global trends of worldwide increasing energy demand, growing scarcity of fossil resources and increasing awareness of environment especially CO2 emissions require a rethinking of today's electrical power system. Thus, sustainable electric power generation, whose transmission and distribution gains more and more attention. Hence, a steadily increasing level of renewable energies is noticeable, which...
With the development and deployment of IEC 61850 based smart substations, cybersecurity vulnerabilities of supervisory control and data acquisition (SCADA) systems are increasingly emerging. In response to the emergence of cybersecurity vulnerabilities in smart substations, a test-bed is indispensable to enable cybersecurity experimentation. In this paper, a comprehensive and realistic cyber-physical...
Enactment of stringent climate protection directives and policies for renewable energy as well as electric vehicle integration is expected to place considerable strain on system frequency stability. Decreasing share of conventional power plants and consequently the loss of readily controllable power generation, makes controlled charging of electric vehicles an attractive option for the Transmission...
Recently, matrix completion (MC) theory has attracted much attention for its capability of recovering low-rank matrix through its partial entries. In particular, MC has been employed in a vast field of array signal processing to reduce the system burden while maintaining the performance to some extent. In this paper, we investigate the application of MC in bistatic MIMO radar parameter estimation,...
In this paper, a baseband predistortion scheme is applied and implemented into real-time FPGA to linearize a Doherty power amplifier for wireless applications. The base-band behavioral models of the Doherty amplifier are based on the Memory Polynomial approach and the direct learning method is applied to estimate the model of the predistorter. For our Doherty power amplifier with a 256-QAM I/Q input...
The market for electric vehicles (EV) is currently limited, but this is expected to grow rapidly with the increased advances in technology, particularly battery technology. Due to their high energy capacity and potential mass deployment, EVs will have significant impact on power networks. This paper presents a novel, user-friendly modelling tool which uses universally accepted, mathematically robust...
In this paper, a millimeter wave 2×2 MIMO (Multiple-Input Multiple-Output) six-port based architecture is proposed and analyzed. This line-of-sight MIMO configuration doubles the data rate without increasing channel bandwidth and exploits spatial diversity. In the system analysis, two pseudo-random BPSK signals of 2 Gb/s data rate are transmitted on two MIMO orthogonal channels. The inherent MIMO...
In this paper, a millimeter wave 2×2 MIMO (Multiple-Input Multiple-Output) six-port based architecture is proposed and analyzed. This line-of-sight MIMO configuration doubles the data rate without increasing channel bandwidth and exploits spatial diversity. In the system analysis, two pseudo-random BPSK signals of 2 Gb/s data rate are transmitted on two MIMO orthogonal channels. The inherent MIMO...
In this paper, we propose a novel chiral metamaterial structure that enables asymmetric electromagnetic (EM) waves propagation. The metamaterial is composed of two metallic sheets with periodic split-ring resonator structures on both sides of a dielectric substrate. By full-wave EM simulations and free space measurements, strong diode-like asymmetric transmission of linearly polarized EM waves through...
This paper discusses the role of high voltage direct current (HVDC) voltage waveforms on partial discharge (PD) activity in paper/oil insulation systems. A variety of voltages were simulated by the PSIM software and synthesized using a high voltage amplifier. Kraft paper sheets were used to create defects incepting PD. The PD signals were coupled by a high frequency ferrite core current transformer...
The effect of dose of hydrogen and helium sequential implantation in Germanium was investigated. The energy of H and He ions was 30keV, and 50keV, respectively. The dose of H was varied from 1E16, 3E16 to 5E16/cm², and the dose of He was kept at 1E16/cm². Atom force microscope was used to detect surface morphology and X-ray diffraction to show the strain evolution of the samples after annealing. We...
Multitendoned extrinsic muscles of the human hand can be divided into several neuromuscular compartments (NMCs), each of which contributes to the ability of human finger to produce independent finger movements or force. The aim of this study was to investigate the changes in the spatial activation of flexor digitorum superficialis (FDS) during the fingertip force production with non-invasive multichannel...
In this paper, we present a method to reduce the sidelobe levels of a given parabolic reflector antenna by coating it with a 2-layer absorber. The absorber is designed by using Genetic Algorithm and an ultra-wideband performance (4.6–18 GHz) is obtained. The simulation results show that the sidelobe level can be reduced by coating the edge of the parabola with 2-layer absorber without compromising...
The main functions of ITER Gas Injection System (GIS) are to provide gas fuelling for plasma, wall conditioning operation, and neutral beam injectors. Dedicated manifold, which contains independent tubes for H2/D2, H2, T2, 4He/3He, N2/Ne, Ar and evacuation, is the key part of gas injection lines. It shall deliver gases from the tritium plant to the various fuelling systems. This paper presents an...
Recently, there are many autonomous navigation applications done in outdoor environment. However, safe navigation is still a daunting challenge in terrain containing vegetation. Thus, a study on vegetation detection for outdoor automobile navigation is investigated in this work. At the early state of our research, we focused on the segmentation of LADAR data into two classes by using local three-dimensional...
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