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A wideband Yagi antenna used for THz integrated application has been successfully developed. The antenna is constructed by some air-gap Coplanar Waveguides (CPW) with different length. The air-gap CPWs are realized by the air bridge technology. A semiinsulating SiC substrate with thickness of 50um is used as the supporter of antenna. Due to the use of the air-gap CPW, the affection of substrate can...
Conditional random fields (CRF) model is suitable for image segmentation because this model directly defines the posterior distribution as a Gibbs field and allows one to capture the dependencies of the observed data. However, this model has a limited ability to capture the high-order label dependencies with only the pairwise potential being constructed generally. Moreover, for synthetic aperture...
We present a numerical analysis on the electric and thermal behaviors of GaN n+n−nn+ Gunn oscillations based on Energy Balance (EB) model and Non-isothermal Energy Balance (NEB) models. We can achieve the influence of lattice heating on the Gunn oscillations based on NEB model, as it is based on the coupling of an energy-balance model with a thermal model for the description of the lattice temperature...
The Well-designed Schottky-ohmic anode contact is demonstrated to effectively suppress the impact ionization concentrated at the anode side in the ultra-short 2-DEG channel of the GaN HEMT-like ballistic electron acceleration (HBEAN) diode which is investigated as a potential terahertz oscillator. An empirical velocity-field characteristics is employed, which is derived from the experimental data...
In this work, we propose an improved small signal equivalent capacitance-voltage (C-V) model to eliminate frequency dispersion in measurement for the AlGaN/GaN heterostructure, and then we calculate the trap density in the buffer layer. Compared with photoluminescence (PL) and high resolution X-ray power diffraction (HRXRD) data, it reveals that the main component of trap is made up of the point defect...
There are two primary troubles having effect on reliability in tradition traveling-wave distance protection schemes. One is reflection wave identification for single-ended traveling-wave protection (A-type), and another is time synchronization for two-ended traveling-wave protection (D type). This paper proposes a novel protection for transmission line unsymmetrical grounded faults, which only needs...
A comprehensive model for the electron mobility in AlGaN lattices-matched to GaN is developed. A large number of experimental and theoretical mobility data and the results of Monte Carlo transport simulations in previous literature have been evaluated and referred as the basis for the model development. The proposed model describes the variation of the field-dependent mobility with carrier concentration,...
An improved analyticl model for the electron mobility in wurtzite ZnO is developed. The numerical results of Monte Carlo transport simulations in previous literature have been evaluated and referred as the basis for the model development. The improved model describes properly the variation of the field-dependent mobility with carrier concentration and temperature, not only for room temperature but...
Electric Power Steering (EPS) systems have many merits over traditional hydraulic power steering systems in fuel economy, variable assist capabilities and favorable road feeling by virtue of adjustment assist characteristic with adopting assist motor in replacement of hydraulic pump. This paper aims at modeling the mechanical parts, the assist motor and electronic control unit by bond graph technique...
A holey fiber design with a high index nanostructure that can achieve an effective mode area not in excess of 0.3 mum2 and a flat dispersion at the 1.55 mum band is proposed and studied.
We report a novel design of photonic crystal fiber (PCF) with a rectangular array of four closely-spaced, highly elliptical air holes in the core region and a circular-air-hole cladding. The proposed PCF is able to support ultra-wideband single-polarization single-mode (SPSM) transmission from the visible band to the near infrared band. With the aid of the inner cladding formed by the central air...
An ultra-wideband single-mode single-polarization photonic crystal fiber design is proposed. Simulations indicate it has a 1540 nm SMSP range with the confinement loss being ≪ 0.25 dB/km and an effective area of 2.2 µm2. Meanwhile, the flat, near-zero group velocity dispersion can also be achieved at ∼800 nm.
We investigate an all-optical (D)QPSK regenerator based on phase-sensitive amplifiers. Simulations show an MZ interferometer with one PSA in each arm can provide significant phase and amplitude noise suppression under optimal pump conditions.
An improved differential extraction method is proposed by intentionally splitting the close interdependence between the parasitic series resistance Rds and the channel length reduction DeltaL. Compared with traditional differential method, the improved one eliminates the overestimation of the bias-dependence of Rds and DeltaL especially at high gate bias, gives meaningful extractions in whole the...
The hot-carrier (HC) degradation of ultra-deep submicrometer lightly doped drain (LDD) metal oxide semiconductor field-effect transistors (MOSFETs) is studied in detail. A further experimental investigation of the two-stage HC degradation in 0.18 mum LDD NMOSFETs is presented. The effects of degradation due to HC stress-induced defects in the oxide spacer and the gate-drain overlap/channel regions...
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