搜索结果: 1-15 共查到“电子科学与技术 L and X Band”相关记录19条 . 查询时间(0.101 秒)
An Electronically Reconfigurable Three Band Low-Noise Amplifier in 0.5 μm GaAs pHEMT Technology
RFIC MMIC LNA Reconfigurable IC
2014/12/8
State-of-the-art RF front-end circuits are typically designed to operate at a single frequency. With an increasing number of available wireless standards, personal mobile communication devices require...
Design and Evaluation of an L-Band Current-Mode Class-D Power Amplifier Integrated Circuit
power amplifier mixer integrated circuit model efficiency
2014/12/8
Power amplifiers (PAs) convert energy from DC to high frequencies in all radio and microwave transmitter systems be they wireless base stations, handsets, radars, heaters, and so on. PAs are the domin...
Band Structure Calculations of Strained Semiconductors Using Empirical Pseudopotential Theory
electronic band structure empirical pseudopotential method semiconductor silicon nanowire strain supercell
2014/11/7
Electronic band structure of various crystal orientations of relaxed and strained bulk, 1D and 2D confined semiconductors are investigated using nonlocal empirical pseudopotential method with spin-orb...
Improved algorithm on retrieval ocean surface current based on X-band radar
ocean surface current X-band radar dispersion relationship membership least square method (LSM)
2012/3/22
In order to overcome the traditional current retrieval algorithm’s shortcomings based on X-band radar, such as a large error existing at the low current rate and the unsteady result, an improved algor...
Adaptive hysteresis band control for constant switching frequency in DTC induction machine drives
Constant switching frequency direct torque control induction machinedrive torque ripple
2010/10/12
It is fairly well known that direct torque control (DTC) exhibits fast dynamic torque response, a property that originates in the fact that torque and flux is directly controlled by instantaneous spac...
Dual-Band Split-Ring Antenna Design for WLAN Applications
Split-ring microstrip antenna dual-band
2009/7/28
A dual-band microstrip antenna based on split-ring elements is introduced for WLAN (2.4/5.2 GHz) applications. The proposed split-ring antenna (SRA) has a compact novel design which provides about 2% ...
Characterization of p-type wide band gap transparent oxide for heterojunction devices
Applied sciences Pure sciences Transparent oxide films Wide band gap semiconductors Transparent oxide Heterojunction devices
2014/11/7
Transparent p-type CuCr1-x Mgx O2 wide band gap oxide semiconductor thin films were deposited over quartz substrates by chemical spray pyrolysis technique using metalloorganic precursors. A mechanism ...
A Compact Wideband Stacked Antenna for the Tri-Band GPS Applications
A Compact Wideband Stacked Antenna the Tri-Band GPS Applications
2010/12/6
A compact wideband stacked patch antenna is presented for the applications of GPS systems. This antenna covers the L1, L2, and L5 GPS bands of operating frequencies 1.575, 1.227, and 1.176 GHz, ...
Ka Band Phase Locked Loop Oscillator Dielectric Resonator Oscillator for Satellite EHF Band Receiver
a Ka Band PLL DRO oscillator the dielectric resonator the active component
2010/12/6
This paper describes the design and fabrication of a Ka Band PLL DRO having a fundamental oscillation frequency of 19.250 GHz, used as local oscillator in the low-noise block of a down converter...
The Novel Microwave Stop-Band Filter
The stop-band filter the new band-rejection element the centre conductor
2010/12/6
The stop-band filter with the new band-rejection element is proposed. The element is a coaxial waveguide with the slot in the centre conductor. In the frame of this research, the numerical and experim...
Multi Band Frequency Synthesizer Based on ISPD PLL with Adapted LC Tuned VCO
GSM/DCS/DECT/UMTS/WiMax ISPD PLL Multi-Band
2010/2/2
The 4G front-end transceiver needs a high
performance which can be obtained mainly with an optimal
architecture and a multi-band Local Oscillator. In this study, we
proposed and presented a new arc...
In this paper two active MMIC mixers for RF front-end applications are described. A down-converter that converts an RF signal (fRF=10.45 GHz) into an IF signal (fIF=0.95 GHz) using an LO s...
Silicon Micromachining for High Performance Passive Structures at W Band
Micromachined Silicon Whispering gallery mode 3D FEM simulation Millimeter-wave
2010/12/7
This paper presents a micromachined technology allowing the realization of very high aspect ratio millimeter-wave circuits. Appropriate 3D electromagnetic simulations based on the finite element metho...
n-GaAs Band-Edge Repositioning by Modification with Metalloporphyrin/Polysiloxane Matrices
Band-edge positions Polysiloxane Metalloporphyrin Modification n-GaAs Photoelectrochemistry
2010/12/7
Tetra(-4-pyridyl)porphyrinatomanganese(III)sulfate, MnP, (in the forms of MnIII and MnII mixture), was embedded into a polysiloxane polymer matrix and attached to the surfaces of n -GaAs wafers. The n...
Dependence on the Partial Pressure of Oxygen on the Shift in the Energy Band-gap of CdO Thin Films in the Visible Region
CdO thin films Shift in the energy band-gap Partial pressure of oxygen
2010/12/8
In this paper, the dependence on the partial pressure of oxygen of the shift in the energy band-gap of CdO thin films for the visible region is investigated from the theoretical point of view on an ex...