A5024089319- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Electromagnetic Compatibility and Measurements
- Antenna Design and Analysis
- Energy Harvesting in Wireless Networks
- Microwave and Dielectric Measurement Techniques
- Advanced Antenna and Metasurface Technologies
- Crystallography and molecular interactions
- Orbital Angular Momentum in Optics
- Antenna Design and Optimization
- Full-Duplex Wireless Communications
- Metamaterials and Metasurfaces Applications
- Astronomy and Astrophysical Research
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Stellar, planetary, and galactic studies
- Optical Wireless Communication Technologies
- Geophysics and Gravity Measurements
- Electromagnetic Compatibility and Noise Suppression
- Tribology and Lubrication Engineering
- Advanced DC-DC Converters
- Metal Alloys Wear and Properties
- Adaptive optics and wavefront sensing
- Advancements in Battery Materials
- Neural Networks and Applications
Northwestern Polytechnical University
2021-2024
Lanzhou University of Technology
2023
Xi'an Jiaotong University
2018-2021
Harbin Engineering University
2021
Tsinghua University
2020
Qingdao Center of Resource Chemistry and New Materials
2019
Tianjin University
2016
Rowan University
2015
University of Electronic Science and Technology of China
2011-2014
Shandong Academy of Sciences
2013
Previous studies on orbital angular momentum (OAM) communication mainly considered line-of-sight environments. In this letter, however, it is found that OAM with high-order modulation can be achieved in highly reverberant environments by combining the multiplexing a spatial equalizer. The exhibits comparable performance of conventional multiple-input multiple-output (MIMO) system.
Data assimilation (DA) is a statistical approach used to estimate the states of physical systems by integrating prior model predictions (background xb​) with observational data (y). This integration produces an accurate estimate, called analysis (​xa), sampling or maximizing posterior likelihood p(xxb, y). In weather forecasting, background are generated imperfect models, and p(xxb) often unknown. Observations, sourced from diverse instruments, mapped space using...
This paper provides an effective technique to reduce the mutual coupling between two adjacent probe-fed microstrip antenna elements operating at 3.5 GHz in multiple input output (MIMO) configurations. The required reduction is achieved via loading of six metallic pins near edges square patch radiators ground radiating order alter polarization antennas. are closely spaced with edge-to-edge separation 0.012λo and a centre-to-centre 0.027λo. idea make antennas orthogonal terms shorting...
In this paper, an ultra-low profile anisotropic holographic metasurface is proposed to generate a linearly polarized high-order Bessel vortex beam carrying orbital angular momentum with predesigned topological charge. Based on the leaky-wave theory and optical principle, impedance pattern can be properly mapped by shaping quasi-periodic different meta-atom sizes. Compared prevalent spatial wave-modulated metasurface, surface effectively transforms reference wave excited feeding source in...
With the rapid development and explosive application of internet things (IoT) technology, IoT devices become ubiquitous indispensable in people's daily lives. with various forms massive production impose challenges on their over-the-air (OTA) testing. Nowadays, conducting OTA testing an efficient, reliable, cost-effective way has urgent demand for industry. Owing to particular properties (e.g., low cost, high efficiency, good repeatability) reverberation chamber (RC), it a popular facility....
The orbital angular momentum (OAM) offers new degrees of freedom and finds application in communications radar imaging. In this letter, the OAM is introduced for reverberation chamber (RC) measurements using metasurfaces. Because space limitation used RC, source has to be located near a sidewall, which inevitably causes some degradation purity. Nevertheless, our experimental results show that field uniformity RC can improved effectively by
An uncertainty model of total radiated power (TRP) measurements in a reverberation chamber (RC) has been proposed previous work, where it was hypothesized that the signal bandwidth had no effect on measurement uncertainty. However, our recent experiments indicate long-term evolution (LTE) device indeed affects TRP's In this article, we investigate TRP tests and improve to include effect. It is shown larger LTE helps reducing This phenomenon can be well-captured by improved model, which...
Nowadays, wireless devices exhibit an explosive growth trend, which imposes great challenges on over-the-air (OTA) testing. Obviously, the reliability and efficiency of OTA testing have significant influences research development devices. The reverberation chamber (RC) has become efficient solution to tests such as total isotropic sensitivity (TIS), especially for large-form-factor In this work, signal bandwidth (BW) effect TIS measurement a long term evolution (LTE) device is analyzed in...
Reverberation chambers (RCs) have become a popular testing facility in antenna efficiency measurements. Unlike the standard reference method, non-reference methods been proposed to measure absence of antenna. However, statistical distributions measured (estimated) total efficiencies using not derived before, making it difficult perform rigorous analysis measurement. In this paper, two an RC are derived, based on which statistics (e.g., expectation and variance) also derived. It is shown that...
Abstract The reverberation chamber (RC) provides a fast and repeatable method for over-the-air (OTA) testing of wireless devices. Moreover, the RC-based can reduce OTA cost to great extent. But defect RC is also obvious. Compared multi-probe anechoic chamber, channel spatial characteristics in are uncontrollable. device under test an usually sees statistically isotropic there strong impediment control RC, which constrains RC’s applications. In this paper, we propose realize reconfigurable...
Since wireless communication technology has been widely applied in our daily lives, devices exhibit explosive growth. A reliable, efficient, and repeatable over-the-air (OTA) testing method is vital for the research development of devices. Due to particular advantages reverberation chamber ( <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">RC</i> ), it become a popular facility perform OTA tests nowadays. In -based tests, loading with radio...
In order to reduce the rolling force and roll wear, lubricants have been used in hot sheet of steel, but lubrication behavior at interface between workpiece steel never well understood. On other hand, process with high reduction thickness developed produce ultra-fine grained steels. The causes some troubles such as increase force, occurrence friction pick up so on. To solve these problems, must be quantitatively this paper, coefficients were measured by using newly simulation testing machine...
A neural network associative memory based on diffraction gratings is presented. The theoretical computational capability of the system discussed and experimental results are
In this work, a 60-GHz silicon-based step-profiled horn antenna is designed and optimized using Bayesian Optimization (BO). Specifically, the fed through substrate integrated waveguide (SIW). The electromagnetic wave transformed upward by transition structure which also used for impedance matching between silicon air. To achieve better broadside radiation gain, mounted on stacked layers with air cavities fenced vias. Before optimization, bandwidth of 0. effectively optimize that has 10...
The reverberation chamber (RC) has been proven to be a powerful technique evaluate the over-the-air (OTA) performances of massive and diverse wireless devices. For devices operating in proximity users, actual OTA performance differs from that measured free space. This indicates practice, do not operate as designed originally. Therefore, gain better understanding optimize design devices, it is necessary re-evaluate considering effects user proximity. In this study, method utilizes...
The blind via holes formation by laser drilling is one of the key technologies for demanding high density interconnect printed circuit boards. In this paper , conditions and quality drilled are examined using a CO2 source against FR4 board without copper foil.We chose energy,pulse shot,pulse width diameter beam as experimental parameter . results showed that energy played more important role on changing vias’ than pulse shot .While take in depth vias.
Along several decades of development, many methods based on reverberation chambers (RCs) have been proposed for accurate and efficient measurement antenna efficiency. The standard reference method (RAM) is applicable almost all frequency bands interest types antennas, thus, it may well be the most widely applied in industry. In this article, an average Rician <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math...
Due to the explosive increase of wireless devices, efficient over‐the‐air testing such devices is highly desirable. The reverberation chamber (RC) offers and cost‐effective means determine performance metrics as total radiated power (TRP). In this study, distribution measured TRP in an RC analytically derived, based on which statistics (i.e. mean, variance) are derived well. measurements have been performed verify statistics.
A compact quad-band slot antenna is presented in this paper.The proposed consists of ground plane, dielectric material and top radiation patch.Firstly, symmetrical L-shaped slots are inserted a patch.Then to achieve multiband performances, square spiral snakelike area with two arms enclosed by long the plane adopted.The process design parametric studies illustrated detail.The final quadband has small size 0.22λ g × 0.28λ = 17 22 mm 2 (where λ guide wavelength) covers frequency bands from...