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This paper presents a design approach for a broadband and high efficiency harmonic-tuned power amplifier (PA) based on a low-pass filtering (LPF) matching network (MN). The MN is composed of quasi-lumped open stubs (λg/8<l< λg/4). Compared with widely used conventional Chebyshev LPF matching networks, the proposed output matching network provides a good approximation of desired lumped elements...
This paper proposes a new approach to implement Frequency Selective Surfaces (FSSs) with sharp transition edges and almost flat bandpass responses. The design is suitable for submillimetre wave and terahertz applications. The proposed structure exhibits a low insertion loss in the desired band. The structure is realized by combining bandstop and bandpass FSS structures on the same plane. By cascading...
Changes in microvascular structure and flow is of clinical importance in the study of a number of disease processes such as cancer and diabetes. Ultrasound is often the primary imaging procedure performed to determine appropriate treatment or surgery for testicular lesions. Currently, however, differentiation and diagnosis of both benign and malignant testicular tumours such as seminomas, leydig cell...
In this study, we investigated pentacene-based ambipolar organic transistors using a linear polyethylenimine (LPEI) as gate dielectric buffer layer. We found that introducing an insulating LPEI layer between the pentacene active channel and the polymethylmetacrylate gate dielectric layer could enhance the n-channel electrical characteristics, such as early-on threshold voltage (Vth), sharp subthreshold...
As we known, the measurement of junction-to-case thermal resistance (Rth-JC) of semiconductor power devices is very important. In this paper, an approach of transient dual interface method (TDIM) with gate-source voltage (Vgs) as the temperature sensitive electrical parameters (TSEP) was investigated for the measurement of Rth-JC of packaged SiC MOSFET. The measured Rth-JC value of packaged SiC MOSFET...
This paper proposes different processing techniques for the polarimetric 3-D imaging of forested areas using multi-baseline interferometric SAR data, acquired in tandem configuration from spaceborne SAR sensors. Tandem-like acquisition modes, based on the simultaneous measurement of interferometric pairs, represent a high-potential alternative for the tomographic imaging of scenes with rapidly decorrelating...
Hole transport material (HTM) free and WOx based perovskite solar cells are theoretically investigated by using driftdiffusion and small signal models. The influence of interface states and leakage current is studied, and the current-voltage (J-V) and capacitance-voltage (C-V) characteristics are reproduced in reasonable agreement with experimental data, including build in potential (Vbi) variation,...
In this study, the optoelectronic properties of a monolithically integrated series-connected tandem solar cell are simulated. Following the large success of hybrid organic-inorganic perovskites, which have recently demonstrated large efficiencies with low production costs, we examine the possibility of using the same perovskites as absorbers in a tandem solar cell. The cell consists in a methyl ammonium...
In this paper, a group-based fast symbol detection scheme is proposed for massive G-STBC MIMO systems. The proposed scheme first chooses a number G, (e.g. G = 4, 6, 8) as the size of each group and then conducts the MMSE detectors to facilitate symbol detection group by group. In particular, instead of directly using huge computational complexity to compute the MMSE detectors, the proposed scheme...
Localization and mobility monitoring are fundamental functions for constructing a smart living space. This paper presents a smart living platform based on motion sensing carpets. It is developed in the form of 50×50cm ‘puzzle floor mat’ units, which allows the users to assemble by themselves according to their desired shape and area. From the pressure data collected by motion sensing carpets, functions...
State-of-the-art silicon interposer technology of chip-on-wafer-on-substrate (CoWoS®) has been applied for the first time in fabricating high performance wafer level system-in-package (WLSiP) containing the 2nd-generation high bandwidth memory (HBM2). An ultra-large Si interposer up to 1200 mm2 made by a two-mask stitching process is used to form the basis of the 2nd-generation CoWoS® (CoWoS®-2) to...
Investigation of eye skew and techniques for reducing its impact on system performance at data rates from 64 Gb/s to 70 Gb/s using PAM-4 directly modulated VCSELs over 100 m MMF is presented.
This paper presents the design, implementation and experimental results of an energy harvesting system to extract energy from power transmission lines. The energy is extracted from a high permeability core clamped on a high alternative current cable. A coil wound on the magnetic core can harvest energy effectively from the power line when the core is operating at the non-saturation region. Little...
In this paper, we demonstrate that femtosecond laser pulse written fiber Bragg gratings (FBGs) fabricated in specialty highly birefringent micro-structured optical fiber (MSF) can be used for high pressure and high temperature monitoring in downhole applications. The design of the micro-structure allows encoding the pressure information into the spectral separation between the two Bragg peaks reflected...
Due to high torque density, low torque ripple, high efficiency, excellent fault-tolerance capability and convenient manufacturing, fraction-slot concentrated windings (FSCWs) are desirable to be used in high performance permanent magnet (PM) synchronous machines.
The measurement of electric current is not always stable, especially when the measured signal requires further electronic conditioning such as printed circuit board (PCB). The current signal must be satisfied to detect the signal into a micro-computer in which sensors transfer current signal into a proportional voltage. The basic sensor requirement includes galvanic isolation and operated a high bandwidth;...
This paper presents a way to reduce energy consumption which is a modified zero-voltage switching pulse width-modulation inverter with a digital signal- processor-based proportional-integral-derivative (PID)-like fuzzy controller (PIDFC). DC to AC energy transformation with a highly inverter device having a Fuzzy controller design, it can be shown that a soft-switching feature can be used to reduce...
Motor control in ball and beam system consists of a beam structure which can be constructed with server electric motor to simulate the Underactuated mechanism system of robot. It can be contacted with a control theory and robot operation in balance behavior. It is well-known that robot structure in 1-D space with a motor to control system balance, which a simple ball and beam system to observe open-loop...
A fault-tolerant direct torque control (DTC) strategy for a brushless dc (BLDC) motor with a single sided matrix converter (SSMC) for an electrohydrostatic actuator system in aerospace application is proposed in this paper. The voltage is divided into seven levels, a torque hysteresis control is applied to each phase, voltage of different levels are provided to the motor to control the torque. A Matlab/Simulink...
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