Results 91 to 100 of about 439,540 (206)

Leveraging Metamaterial‐Inspired Wireless Resonator for Reliable Quantitative MRI at 1.5T: Linearity, Bias, and Repeatability Assessment

Advanced Physics Research, EarlyView.
This study designed a nonlinear‐response metamaterial‐inspired wireless resonator (MWR) and systematically evaluated the feasibility of using MWR for quantitative magnetic resonance imaging (qMRI), including T1/T2 mapping, apparent diffusion coefficient, and proton density fat fraction.
Yakui Wang, Yingyi Qi, Bing Liu, Zhonghai Chi, Yi Yi, Xinxin Li, Yibei Yu, Qian Zhao, Zhuozhao Zheng   +8 more
wiley   +1 more source

High‐resolution 3D imaging by microwave photonic time division multiplexing‐multiple‐input‐multiple‐output radar with broadband digital beamforming

IET Radar, Sonar & Navigation
A broadband microwave photonic time division multiplexing (TDM) multiple‐input‐multiple‐output (MIMO) radar is proposed in which photonic frequency quadrupling is adopted to generate broadband radar signals and photonic frequency mixing is implemented ...
Yuewen Zhou, Fangzheng Zhang, Jiayuan Kong, Shilong Pan   +3 more
doaj   +1 more source

Continuous Rapid⁃Beam⁃Scanning and Circular⁃Polarized Leaky⁃Wave Antenna Based on Meandering⁃SIW with Defected Ground Structures

Transactions of Nanjing University of Aeronautics and Astronautics
A compact high-scanning-rate circular-polarized leaky-wave antenna （LWA） based on a meandering substrate integrated waveguide （SIW） with defected ground structures （DGSs） is presented.
RUAN Yizheng, NIU Zhenyi, CHEN Weikang, ZHAO Yongjiu, PAN Shilong   +4 more
doaj   +1 more source

On the Impact of Mechanical Constraint on Band Structure and Photo‐Elastic Effect in Photonic Resonators

Advanced Physics Research, EarlyView.
We computationally investigate the mechanical, electronic, and optical properties of strained GeSn microdisks on silicon substrates. By combining photo‐elasticity, strain‐dependent band‐structure calculations, and optical mode analysis, we study how strain distribution, structural configuration, and temperature affect the electronic band structure and ...
Jon Schlipf, Ignatii Zaitsev, Inga Anita Fischer, Davide Spirito, Bernd Witzigmann, Costanza Lucia Manganelli   +5 more
wiley   +1 more source

Frequency-modulated continuous-wave laser ranging beyond the limits of bandwidth and phase noise

APL Photonics
Frequency-modulated continuous-wave (FMCW) laser ranging typically applies an interferometer and linear frequency-modulated (LFM) signals to measure the distance, in which precision and resolution are limited by the phase noise of laser and the bandwidth
Xiuyuan Sun, Zhongyang Xu, Hangtian Lu, Qiyue Yu, Kai Wang, Shilong Pan   +5 more
doaj   +1 more source

A New Method of Robust Ground Moving Target Detection Under Different Backgrounds of Airborne SAR Based on Spatial Deformable Module

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Combined with the synthetic aperture radar (SAR) imaging algorithm, diverse simulation sample sets of ground moving targets are constructed to tackle the problem of insufficient measured data in the SAR ground moving target indication algorithm based on ...
He Yan, Hui Liu, Jialin Hao, Wenshuo Xu, Jingdong Zhang, Di Wu, Xudong Wang, Gong Zhang, Daiyin Zhu   +8 more
doaj   +1 more source

Concept for Continuously Tunable Output Filters for Digital Transmitter Architectures

IEEE Access, 2019
This paper presents a novel output filter approach for continuously frequency-tunable digital power amplifiers, suitable for future seamless and band-less applications in 5G, e.g. for cognitive radios (CR). The presented tunable output filter is based on
Christian Schuster, Lukas Schynol, Andreas Wentzel, Florian Huhn, Ersin Polat, Sonke Schmidt, Rolf Jakoby, Wolfgang Heinrich, Holger Maune   +8 more
doaj   +1 more source

Two‐Dimensional van der Waals Antiferromagnets: Fabrication, Probes, Control, and Applications

Advanced Physics Research, EarlyView.
Two‐dimensional van der Waals antiferromagnets are emerging as versatile platforms for spintronic, optoelectronic, and quantum devices. This review summarizes recent progress in their fabrication, magnetic characterization, fields, interfacial engineering, chemical modification, and representative applications.
Huangyu Wu, Zeyu Han, Yueyao Wang, Yitao Yu, Mingyang Yin, Yikang Jin, Yongjun Huo, Lihong Gao, Zhuang Ma, Gang Zhang, Miao Jiang   +10 more
wiley   +1 more source

Ultrafast RF Spectrum Analyzer Assisted by Optical Short‐Time Fourier Transform

Advanced Physics Research, EarlyView.
We present Recent efforts in an ultrafast RF spectrum analyzer based on the short‐time Fourier transform (STFT) at over 10 MHz frame rate and over 40GHz bandwidth to improve performance and support applications. All these efforts could inspire more innovative applications of temporal imaging modalities in the future.
Liao Chen, Yufan Du, Rongwu Liu, Chi Zhang, Xinliang Zhang   +4 more
wiley   +1 more source

An inversely designed integrated spectrometer with reconfigurable performance and ultra-low power consumption

Opto-Electronic Advances
Despite the pressing demand for integrated spectrometers, a solution that deliver high-performance while being practically operated is still missing.
Ang Li, Yifan Wu, Chang Wang, Feixia Bao, Zongyin Yang, Shilong Pan   +5 more
doaj   +1 more source