A5056840720- Microwave Engineering and Waveguides
- Advanced Antenna and Metasurface Technologies
- Radio Frequency Integrated Circuit Design
- Antenna Design and Analysis
- Non-Invasive Vital Sign Monitoring
- Magnetic confinement fusion research
- Antenna Design and Optimization
- Advanced MEMS and NEMS Technologies
- Millimeter-Wave Propagation and Modeling
- Acoustic Wave Resonator Technologies
- Ionosphere and magnetosphere dynamics
- Electromagnetic Compatibility and Measurements
- Particle accelerators and beam dynamics
- Indoor and Outdoor Localization Technologies
- Radar Systems and Signal Processing
- Gyrotron and Vacuum Electronics Research
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Electromagnetic Compatibility and Noise Suppression
- Advanced Materials and Mechanics
- Energy Harvesting in Wireless Networks
- Microwave Imaging and Scattering Analysis
- Semiconductor Quantum Structures and Devices
- Photonic and Optical Devices
National Chung Cheng University
2015-2024
Taiwan Semiconductor Manufacturing Company (Taiwan)
2024
University of Salford
2022
American University in Cairo
2022
Kyoto University
2021
National Taiwan University of Science and Technology
2012-2016
Chunghwa Telecom (Taiwan)
2016
Chung Yuan Christian University
2014
University of California, Davis
2000-2006
National Yang Ming Chiao Tung University
2004
A compact broadband 8-way Butler matrix integrated with tunable phase shifters is proposed to provide full beam switching/steering capability. The newly designed multilayer stripline exhibits an average insertion loss of 1.1 dB amplitude variation less than ±2.2 and imbalance 20.7° from 1.6 GHz 2.8 GHz. circuit size only 160 × 100 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> , which corresponds 85% reduction compared a comparable...
A Cu(2)S-CuInS(2)-ZnSe quantum dot (QD)-sensitized solar cell with cascaded energy gap structures has been fabricated. Under simulated illumination (AM 1.5, 100 mW cm(-2)), the best device is obtained a QD-sensitized cell, yielding power conversion efficiency of 2.52%.
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> A reflection-type phase shifter with constant insertion loss over a wide relative phase-shift range is presented. This important feature attributed to the salient integration of an impedance-transforming quadrature coupler equalized series-resonated varactors. The used increase maximal shift for given varactor limited capacitance range. When tuned, typical large insertion-loss variation due...
Inviscid model of solar wind assuming total energy transported by kinetic convection at infinity
A cadmium-free CuInS2 quantum dot (QD)-sensitized solar cell (QDSC) has been fabricated by taking advantage of the ex situ synthesis approach for fabricating highly crystalline QDs and in successive ionic-layer adsorption reaction (SILAR) achieving high surface coverage QDs. The synthesized can be rendered water soluble through a simple rapid two-step method under assistance ultrasonication. This allows stepwise ligand change from insertion foreign to replacement, which preserves long-term...
In recent decades, wireless healthcare detection has been demonstrated to be an efficient method for monitoring the health condition of targets; it involved motion and vital sign signals with minimal discomfort. Self-injection-locked (SIL) radar systems exhibit several useful advantages over conventional continuous-wave (CW) in applications, including a low system complexity, high sensitivity, clutter immunity. Several approaches detecting locations using SIL have proposed. This paper...
A GaN-based vertical-cavity surface emitting laser (VCSEL) structure featuring a silicon-diffusion-defined current blocking layer for lateral confinement is described. Sub-milliamp threshold currents were achieved both 3- and 5-μm-aperture VCSELs under continuous-wave operation at room temperature. The vertical cavity was defined by top dielectric distributed Bragg reflector (DBR) bottom epitaxial DBR. emission spectrum exhibited single peak 411.2 nm with linewidth of 0.4 side mode...
As global demand for energy-efficient cooling technologies grows, optimizing window air conditioners (WACs) is crucial. This study integrates computational fluid dynamics (CFD) and experimental (EFD) to analyze condensate transport induced by the slinger ring in a WAC system. To investigate behavior, domain divided into six regions based on ring’s rotational direction impact. In initial impact zone, large liquid structures adhere before breaking ligaments. upward region, films rise along...
Significant advances in microwave and millimeter wave technology over the past decade have enabled development of a new generation imaging diagnostics for current envisioned magnetic fusion devices. Prominent among these are electron cyclotron emission imaging, phase interferometers, scattering, reflectometer systems Te ne fluctuations (both turbulent coherent) profiles (including transport barriers) on toroidal devices such as tokamaks, spherical tori, stellarators. The diagnostic is...
CMOS reflection-type phase shifters with minimal insertion-loss variation over quadrants of phase-shift range are presented. Two performance enhancement techniques proposed. First, the 3-dB quadrature hybrid is designed a phase-compensated inductively coupled hybrid. Second, an impedance-transformed pi-resonated varactor network presented to provide full 360deg range, using MOSFET limited reactance range. The design considerations and simulation described. experimental 2.45-GHz were...
view Abstract Citations (52) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A Viscous Model of the Solar Wind Whang, Y. C. ; Liu, K. Chang, In this paper a viscous, thermal conductive model solar wind is studied by using NavierStokes equations to describe motion wind. The fluid are reduced system three first-order non-linear differential equations. for viscous does not have singular point at Mach T8 asymptotic solution shows that temperature...
A speech radar system is presented for extracting information from the vocal vibration signal of a human subject. Due to tiny glottis motion several millimeters, coherent homodyne demodulator with high sensitivity developed detect reflected radio signal, phase modulated by vibrating cords. The detection quality and circuit design are described. Measurements vowels words, both conventional acoustic microphone system, were conducted compared. essential can be reliably obtained proposed radar,...
A 2.45 GHz two-dimensional (2-D) 4×4 multi-beam phased array was designed, based on the Butler matrix beamforming technique. Sixteen beam states are produced by two stacks of 4-way matrices, where one stack controls vertical angle and other horizontal angle. To achieve system compactness, in grounded coplanar-waveguide (CPWG) configuration is newly leading to 54% size reduction comparing with microstrip line-based matrix. The demonstration capability integrated provided.
This paper presents a novel design of monolithic 2.5-GHz 4times4 Butler matrix in 0.18-mum CMOS technology. To achieve full integration smart antenna system monolithically, the proposed is designed with phase-compensated transformer-based quadrature couplers and reflection-type phase shifters. The measurements show an accurate distribution 45plusmn3deg, 135 plusmn 4deg, -45 3deg, -135 4deg amplitude imbalance less than 1.5 dB. beamforming capability also demonstrated by integrating 1 X 4...
A compact low-power phased array receiver with continuous beam steering is presented based on the subsector technique. The entire range divided into five subsectors from four characteristic beams of Butler matrix. In each receive steered by weighted combination received signals antennas. theory detailed and relationship angle factors derived. proposed architecture has lower circuit complexity less power consumption because no challenging CMOS 360° variable phase shifters multi-phase...
An enhanced stepped-impedance combline bandpass filter employs an array of resonators with tapped-transformer coupling at input and output is presented in this study. This has performance, including symmetric insertion-loss response around the passband wider stopband range. The structure compact suitable for multilayer realization because it free lumped capacitors fewer via-hole grounds. circuit investigated characteristic mode theory coupled lines to prove existence multiple transmission...
A 24-GHz 4-way Butler Matrix MMIC in 0.18-μm CMOS technology is presented. The multi-layer structure of process utilized to monolithically realize the bulky matrix on silicon substrate. Particularly, bifilar transformer introduced miniaturize circuit and reduce signal loss. implemented only occupies a chip area 0.41 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> (excluding I/O pads). experimental results show that insertion losses...
This paper presents a fully integrated V-band 8 x Butler matrix in 0.13-μm CMOS technology. Since the number of building blocks exponentially increases with order matrix, constituted components, including quadrature hybrids, phase shifters, and crossovers, must be redesigned for single-chip implementation silicon. Design equations novel layout arrangements are described. A demonstrated was implemented, which has compact chip size 1.45 0.93 mm <sup...
Integrated Optical Interconnection System (iOIS) is proposed for the first time computing and communication systems by leveraging 3DFabric platform. We propose use of second-generation COUPE (iOIS_COUPE2.0) as optical engine with CoWoS-based composite interposer (iOIS_CI) integration platform HPC, networking applications. In COUPE2.0, a vertical broad-band coupler integrated embedded microlens loss 0.3 dB alignment tolerance ±10 μm. While in CI, highly electrical interconnection layer can...
This paper presents compact CMOS quadrature hybrids by using the transformer over-coupling technique to eliminate significant phase error in presence of low- <i xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> components. The includes inductive and capacitive couplings, where former is realized employing a tightly inductive-coupled latter an additional capacitor across winding. Their balance effects are investigated design methodology presented....
A 24-GHz bi-directional CMOS reflection-type phase shifter (RTPS) with full 360deg tuning range and minimal insertion-loss variation is presented. Two circuit enhancement techniques are employed: the broadside-coupled transformer-based hybrid pi-type resonated varactor load. The implemented 0.18-mum RTPS demonstrates a measured shift of small plusmn1.2 dB at 24 GHz. chip 0.33 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> in area it...