Results 31 to 40 of about 157,315 (201)

A Fully Polarized Antenna Covering the Hemispherical Airspace

IEEE Access, 2021
A fully polarized antenna has been proposed in this paper. The antenna is composed of four independent antennas, named X, Y, H, V. The simulation and measurement results verify the independent antenna radiation performance and the function of the fully ...
Jiashan Liu, Hongda Lu, Ke Pang, Zhipeng Liu, Yong Liu, Xin Lv   +5 more
doaj   +1 more source

Millimeter-wave detection of landmines

SPIE Proceedings, 2013
Millimeter wave absorption relative to background soil can be used for detection landmines with little or no metal content. At these frequencies, soil and landmine absorb electromagnetic energy differently. Stepped frequency measurements from 20 GHz to 60 GHz were used to detect buried surrogate landmines in the soil.
Ozturk, Hilmi, Nazli, Hakki, Yegin, Korkut, Bicak, Emrullah, Sezgin, Mehmet, Dag, Mahmut, Turetken, Bahattin   +6 more
openaire   +3 more sources

A Circularly-Polarized-Reconfigurable Patch Antenna With Liquid Dielectric

IEEE Open Journal of Antennas and Propagation, 2021
A circularly-polarized-reconfigurable patch antenna based on fluidic control method is proposed in this paper. A liquid dielectric, ethyl acetate, is introduced to change the substrate of a patch antenna from homogeneous to inhomogeneous.
Zhe Chen, Hao-Zhan Li, Hang Wong, Xiao Zhang, Tao Yuan   +4 more
doaj   +1 more source

Multifunctional movable-type coding metasurface enabling reconfigurable diffractive neural networks

Light: Science & Applications
Optical computing holds significant promise across diverse applications due to its low latency, power efficiency, and multidimensional processing capabilities. However, current diffraction neural networks (DNNs) generally lack reconfigurability, limiting
Zhicai Yu, Xinyu Li, Ze Gu, Long Chen, Jianlin Su, Zixuan Cai, Xinyi Yu, Shilong Qin, Lei Zhang, Qian Ma, Jian Wei You, Tie Jun Cui   +11 more
doaj   +1 more source

Decoupling of Dual-Polarized Antenna Arrays Using Non-Resonant Metasurface

Sensors, 2022
A non-resonant metasurface (NRMS) concept is reported in this paper to improve the isolation of dual-polarized and wideband large-scale antenna arrays. By properly designing the NRMS, it can perform stable negative permeability and positive permittivity ...
Shengyuan Luo, Peng Mei, Yiming Zhang, Gert Frølund Pedersen, Shuai Zhang   +4 more
doaj   +1 more source

BioMeta: modular reprogrammable metasurface for noninvasive human respiration monitoring

Nanophotonics
Human vital-sign sensing using electromagnetic wave has emerged as a promising technology for the noninvasive monitoring of individuals’ health status. Here, a modular reprogrammable metasurface system is presented to suppress noise in noninvasive human ...
Li Xin Yu, Chen Long, Qin Shi Long, Zhao Ke Zhan, Cai Zi Xuan, Peng Qiao Cong, Ma Qian, You Jian Wei, Cui Tie Jun   +8 more
doaj   +1 more source

Multi‐Dimensional Multiplexed Metasurface for Multifunctional Near‐Field Modulation by Physics‐Driven Intelligent Design

Advanced Science
Metasurface is a revolutionary platform to achieve desired properties by artificially engineering meta‐atom's arrangements. However, the explosively expanding design space of advanced metasurfaces with multiple degrees of freedom (MDOF) has made the ...
Jian Lin Su, Zi Xuan Cai, Yiqian Mao, Long Chen, Xin Yi Yu, Zhi Cai Yu, Qian Ma, Si Qi Huang, Jianan Zhang, Jian Wei You, Tie Jun Cui   +10 more
doaj   +1 more source

Millimeter-wave antenna system [PDF]

, 1973
Parabolic reflectors fabricated from Carbon Fiber Reinforced Plastic (CFRP) composite material will not distort their shape by more than 3 percent of millimeter wavelength, despite large temperature differences on reflector surfaces.
Evans, J., Gould, W. I., Jr.
core   +1 more source

Dual-Frequency Linear-to-Circular Polarization Converter for Ka-Band Applications

Sensors, 2022
A dual-band linear-to-circular planar polarization converter based on a multilayer printed circuit board (PCB) is proposed and demonstrated. Each cell of the periodic surface is formed by six substrate layers separated by five foam spacers. The three top
Francesco Greco, Emilio Arnieri
doaj   +1 more source

Physics‐Informed Deep Learning Method for Real‐Time Multi‐Harmonic Beamforming Based on Space‐Time‐Coding Metasurface

Advanced Electronic Materials
Space‐time‐coding metasurfaces (STCMs) enable simultaneous controls of electromagnetic wave across multiple harmonics, but designing high‐performance coding sequences in real time remains challenging.
Jiang Han Bao, Che Liu, Yi Ning Zheng, Lei Zhang, Wen Ming Yu, Lianlin Li, Tie Jun Cui   +6 more
doaj   +1 more source