- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Weighted Sum-Based Color Filter Array Interpolation Using Taylor Series Cubic Approximation
摘要： In this paper, we introduce a weighted sum-based color filter array interpolation method using Taylor series cubic approximation. We use a high-order approximation to predict accurate pixel values during the reconstruction of quincunx grid-sampled green channels, and perform a weighted average-based interpolation in a large local window. We also perform prediction utilizing a color difference model in a small local window to generate additional green values. By applying the weighted sum method to the predicted green values in two local windows, green channel can be enhanced. The remaining color components, namely, the rectangular grid-sampled red and blue channels, are interpolated utilizing the weighted average method of the color difference model. Additionally, we propose a post-processing method that removes the zipper artifacts generated during the interpolation process. Experimental results demonstrate that the proposed color filter array interpolation system outperforms existing algorithms in terms of both objective and subjective performance.
关键词： image interpolation,Color filter array interpolation,Bayer pattern,Taylor series approximation,demosaicking
更新于2025-09-09 09:28:46
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Synthesis and Optical Properties of ZnO Nanoneedles Array
摘要： Zinc oxide nanoneedles array were synthesized on Si substrate by catalyst-free chemical vapor deposition technique. Scanning electron microscopic images displayed that the ZnO nanoneedles with average diameter of 100 nm were aligned well on Si substrate. TEM images showed that there were some steps on the top of ZnO nanoneedles. Only (002) diffraction peak of ZnO can be found in the XRD patterns of the samples, indicating that the as-grown nanoneedles are highly crystalline in nature and grow along the [0001] direction. The growth mechanism of ZnO nanoneedles array is consistent with step kinetics and bizarre surface growing and the crystal growth is a typical simple-two-dimensional-nucleation normal-layer-growth. Room-temperature photoluminescence spectrum of ZnO nanoneedles array showed two near band-edge emission peaks at 380 and 389 nm and a deep level emission around 480 nm.
关键词： Bizarre surface,Step kinetics,Photoluminescence,ZnO nanoneedles array
更新于2025-09-09 09:28:46
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[IEEE 2018 IEEE Research and Applications of Photonics In Defense Conference (RAPID) - Miramar Beach, FL (2018.8.22-2018.8.24)] 2018 IEEE Research and Applications of Photonics In Defense Conference (RAPID) - Integrated Photonics for RF-Photonic Phased-Array Radar System
摘要： We discuss some potential benefits of using integrated RF-photonic devices/circuits in a phased-array-Radar system. A viable and simple solution is proposed for a low-cost, RF-photonic multi-beams beamformer that meets both transmitting and receiving RF-system specifications/requirements. Proof-of-concept experiments and chip-scale integrated-photonics subsystem development will also be discussed.
关键词： Phased array Radar,Fiber optics links and subsystems,Optical control of phased array antenna,Radio frequency photonics,Integrated Photonics
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Comparative study of compressive sensing imaging in different array configurations
摘要： Compressive sensing (CS) has attracted considerable attention in many imaging applications owing to its high resolution and data under-sampling capabilities. However, the performance differs in many imaging applications due to different formulations of the sensing matrix. This paper presents a comparative study of CS array imaging under switched array, multiple-input multiple-output (MIMO) array and phased array configurations. Numerical simulations concerning their imaging performance are provided considering factors like sparsity level, element spacing and noise condition.
关键词： antenna array,array imaging,compressive sensing
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - A planar dual-polarized ultra-wideband millimeter-wave array antenna
摘要： We present a dual-polarized ultra-wideband element in an in?nite large array condition for planar phased array antennas in mm-wave applications. The array antenna consists of tightly-coupled bowties in a dual-offset con?guration. In order to simplify the manufacturing process and eliminate the scalability limitation, a new feeding network is employed. The feeding is inspired by magneto-electric dipoles (MEDs) and planar ultra-wideband array antennas (PUMAs). Hence, the feeding is integrated with the horizontally oriented radiating bowties and removes the need for the external baluns. The simulated antenna shows relative bandwidths of 2.3 : 1 and 3 : 1 at VSWR<3, for maximum scanning angles of 60? and 45?, respectively, at both E- and H-planes.
关键词： mm-Wave,Phased array antenna,UWB,Array antenna
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Fabric Based Beam Steering Wearable Antenna Array
摘要： A beam steering fabric based parasitic antenna array is introduced for operation at around 4.4 GHz. The array designed and built using conductive and nonconductive fabric materials and PIN diode switches show steering along 90, 0, and 270 degrees along the azimuth with measured peak gain between 6.8 to 8.5 dBi.
关键词： wearable antenna,beam steering Array,parasitic array,fabric antenna
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Synchronization of Multiple Independent Sub-Array Antennas for IoT applications
摘要： In this paper we present a new technique to synchronize multiple individual unsynchronized sub-array antenna systems to form one large aperture array antenna system. The proposed technique synchronizes the time and the frequency of the different sub array antenna systems, using a joint Maximum Likelihood (ML) optimization for a data aided received signal, while the phase coherency between the sub arrays is achieved using a combination of least mean square (LMS) and ML algorithms. The experimental results show that the proposed technique is stable in estimating the global array antenna pattern and converges within the ?rst 50 samples of the received data.
关键词： ML algorithm,pattern beamforming,array signal processing,LMS algorithm,IoT Localization,Angle of Arrival estimation AoA,adaptive array antenna systems
更新于2025-09-04 15:30:14
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Uniform Arrays with Low Sidelobe Two-Way Antenna Patterns
摘要： The peak sidelobe level of a two-way array factor resulting from a uniform transmit and uniform receive apertures can be lowered by making the two apertures different sizes. The concept is demonstrated using uniform linear and uniform receive arrays with different number of elements and one array has a null in the direction of the first sidelobe of the other.
关键词： antenna array,low sidelobes,two-way antenna pattern,phased array
更新于2025-09-04 15:30:14
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[IEEE 2018 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) - Melbourne, Australia (2018.8.15-2018.8.17)] 2018 IEEE International Symposium on Radio-Frequency Integration Technology (RFIT) - A Fully-Integrated <tex>$S$</tex>-Band Differential LNA in <tex>$0.15-\mu \mathrm{m}$</tex> GaAs pHEMT for Radio Astronomical Receiver
摘要： A fully-integrated S-band high-gain MMIC low noise amplifier (LNA) with differential input and single-ended output is presented and implemented in 0.15-μm GaAs pHEMT for Square Kilometre Array (SKA) astronomical receiver. The low-loss input noise matching network is designed, and the fully on-chip LC balun is introduced between the first stage LNA core and the second stage amplifier to improve overall system noise figure. The 1-dB bandwidth of the LNA covers from 1.5 to 3.7 GHz. The measurement results demonstrate 31.8-dB gain, average in-band noise figure of 0.73 dB with DC power con- sumption of 25 mW. The chip area is 2.5 x 2 mm2. Also, a noise figure measurement method for the 3-port differential-input-to- single-ended-output amplifiers is introduced in this paper.
关键词： differential low noise amplifier,GaAs pHEMT,Square Kilometre Array (SKA),fully- integrated,balun,broadband,S-band
更新于2025-09-04 15:30:14
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A CMOS-Based Thermopile Array Fabricated on a Single SiO2 Membrane
摘要： We present a novel thermopile-based infrared (IR) sensor array fabricated on a single CMOS dielectric membrane, comprising of poly-silicon p+ and n+ elements. Processing of the chip is simplified by fabricating the entire array on a single membrane and by using standard CMOS Al metal layers for thermopile cold junction heatsinking. On a chip area of 1.76 mm × 1.76 mm, with a membrane size of 1.2 mm × 1.2 mm, we fabricated IR sensor arrays with 8 × 8 to 100 × 100 pixels. The 8 × 8 pixel device has <2% thermal crosstalk, a responsivity of 36 V/W and enhanced optical absorption in the 8–14 μm waveband, making it particularly suitable for people presence sensing.
关键词： IR image sensor,presence sensing,thermopile array,MEMS,infrared,CMOS
更新于2025-09-04 15:30:14