Pancharatnam–Berry(PB)phase metasurface,as a special class of gradient metasurfaces,has been paid much attention owing to the robust performance for phase control of circularly polarized waves.Herein,we present an el...Pancharatnam–Berry(PB)phase metasurface,as a special class of gradient metasurfaces,has been paid much attention owing to the robust performance for phase control of circularly polarized waves.Herein,we present an element-based polarizer for the first step,which enables the incident electromagnetic waves into the cross-polarized waves with the relative bandwidth of 71%,and the polarization conversion ratio exceeds 90%at 6.9–14.5 GHz.Then an eight-elements coding polarizer based on the PB phase is presented for the applications on beam control and radar cross section reduction.The simulated values indicate that the reduction of radar cross section is more than 10 dB at 6–16 GHz.Our work reveals the availability of manipulating the waves,beamforming in communication systems and electromagnetic stealth,and so on.展开更多
The traditional industrial assembly method is inefficient,and it is difficult to meet the needs of rapid production in modern society.Although many virtual assembly systems based on augmented reality technology have a...The traditional industrial assembly method is inefficient,and it is difficult to meet the needs of rapid production in modern society.Although many virtual assembly systems based on augmented reality technology have appeared in recent years,most of these assembly systems are noninteractive,nonintelligent,and inefficient.In response to this problem,we combined AR technology and AI technology to design and implement a strong interactive,high-intelligence virtual assembly guidance system in four levels.Finally,we took a UAV assembly as an example to show our design results.Operators can use this system to quickly master the assembly process.Finally,according to some problems encountered in the process of system implementation,the improvement direction of the virtual assembly system is proposed,and the future development of the AR auxiliary industry is proposed.This article describes the functions and implementation process of the four levels of the AR assembly system in detail,which can help readers quickly understand the connection between AR technology and AI technology and understand the principle of the virtual assembly guidance system.展开更多
基金supported by the National Natural Science Foundation of China(No.42274189)the Project of Science and Technology of Shaanxi(No.2021JM-395).
文摘Pancharatnam–Berry(PB)phase metasurface,as a special class of gradient metasurfaces,has been paid much attention owing to the robust performance for phase control of circularly polarized waves.Herein,we present an element-based polarizer for the first step,which enables the incident electromagnetic waves into the cross-polarized waves with the relative bandwidth of 71%,and the polarization conversion ratio exceeds 90%at 6.9–14.5 GHz.Then an eight-elements coding polarizer based on the PB phase is presented for the applications on beam control and radar cross section reduction.The simulated values indicate that the reduction of radar cross section is more than 10 dB at 6–16 GHz.Our work reveals the availability of manipulating the waves,beamforming in communication systems and electromagnetic stealth,and so on.
文摘The traditional industrial assembly method is inefficient,and it is difficult to meet the needs of rapid production in modern society.Although many virtual assembly systems based on augmented reality technology have appeared in recent years,most of these assembly systems are noninteractive,nonintelligent,and inefficient.In response to this problem,we combined AR technology and AI technology to design and implement a strong interactive,high-intelligence virtual assembly guidance system in four levels.Finally,we took a UAV assembly as an example to show our design results.Operators can use this system to quickly master the assembly process.Finally,according to some problems encountered in the process of system implementation,the improvement direction of the virtual assembly system is proposed,and the future development of the AR auxiliary industry is proposed.This article describes the functions and implementation process of the four levels of the AR assembly system in detail,which can help readers quickly understand the connection between AR technology and AI technology and understand the principle of the virtual assembly guidance system.
