期刊文献+
共找到11篇文章
< 1 >
每页显示 20 50 100
Ultra-thin circularly polarized lens antenna based on single-layered transparent metasurface 被引量:1
1
作者 Kaiyue Liu Guangming Wang +3 位作者 Tong Cai Wenlong Guo Yaqiang Zhuang Gang Liu 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第8期235-241,共7页
Circularly polarized (CP) lens antenna has been applied to numerous wireless communication systems based on its unique advantages such as high antenna gain, low manufacturing cost, especially stable data transmissio... Circularly polarized (CP) lens antenna has been applied to numerous wireless communication systems based on its unique advantages such as high antenna gain, low manufacturing cost, especially stable data transmission between the transmitter and the receiver. Unfortunately, current available CP lens antennas mostly suffer from high profile, low aperture efficiency as well as complex design. In this paper, we propose an ultra-thin CP lens antenna based on the designed single- layered Pancharatnam-Berry (PB) transparent metasurface with focusing property. The PB metasurface exhibits a high transmissivity, which ensures a high efficiency of the focusing property. Launched the metasurface with a CP patch antenna at its focal point, a low-profile lens antenna is simulated and measured. The experimental results show that our lens antenna exhibits a series of advantages including high radiation gain of 20.7 dB, aperture efficiency better than 41.3%, and also narrow half power beam width (HPBW) of 13°at about 14GHz. Our finding opens a door to realize ultra-thin transparent metasurface with other functionalities or at other working frequencies. 展开更多
关键词 lens antenna ULTRA-THIN transparent Pancharatnam-Berry (PB) metasurface single-layered
原文传递
Ultra-thin single-layer transparent geometrical phase gradient metasurface and its application to high-gain circularly-polarized lens antenna 被引量:1
2
作者 李唐景 梁建刚 +1 位作者 李海鹏 刘亚峤 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期332-336,共5页
A new method to design an ultra-thin high-gain circularly-polarized antenna system with high efficiency is proposed based on the geometrical phase gradient metasurface(GPGM).With an accuracy control of the transmiss... A new method to design an ultra-thin high-gain circularly-polarized antenna system with high efficiency is proposed based on the geometrical phase gradient metasurface(GPGM).With an accuracy control of the transmission phase and also the high transmission amplitude,the GPGM is capable of manipulating an electromagnetic wave arbitrarily.A focusing transmission lens working at Ku band is well optimized with the F /D of 0.32.A good focusing effect is demonstrated clearly by theoretical calculation and electromagnetic simulation.For further application,an ultra-thin single-layer transmissive lens antenna based on the proposed focusing metasurface operating at 13 GHz is implemented and launched by an original patch antenna from the perspective of high integration,simple structure,and low cost.Numerical and experimental results coincide well,indicating the advantages of the antenna system,such as a high gain of 17.6 d B,the axis ratio better than 2 d B,a high aperture efficiency of 41%,and also a simple fabrication process based on the convenient print circuit board technology.The good performance of the proposed antenna indicates promising applications in portable communication systems. 展开更多
关键词 geometrical phase gradient metasurface circular polarization lens antenna
原文传递
Dual-polarized lens antenna based on multimode metasurfaces
3
作者 Hao-Fang Wang Zheng-Bin Wang +1 位作者 Yong Cheng and Ye-Rong Zhang 《Chinese Physics B》 SCIE EI CAS CSCD 2018年第11期613-619,共7页
We propose a dual-polarized lens antenna system based on isotropic metasurfaces for 12 GHz applications. The metasurface lens is composed of subwavelength unit cells(0.24λ0) with metallic strips etched on the top a... We propose a dual-polarized lens antenna system based on isotropic metasurfaces for 12 GHz applications. The metasurface lens is composed of subwavelength unit cells(0.24λ0) with metallic strips etched on the top and bottom sides of the unit cell, and a cross-slots metallic layer in the middle that serves as the ground. The multimode resonance in the unit cell can realize a large phase shift(covering 0?–360?), and the total transmission efficiency of the lens is above 80%.The feed antenna at the focal point of the lens is a broadband dual-polarized microstrip antenna. Both the simulated and the measured results demonstrate that the dual-polarized lens antenna system can realize a gain of more than 16.1 dB, and an input port isolation of more than 25.0 dB. 展开更多
关键词 dual polarization metasurfaces lens antenna multimode resonance low-profile
原文传递
A Beamforming Technique Using Rotman Lens Antenna for Wireless Relay Networks
4
作者 Samer Alabed Mohammad Al-Rabayah Wael Hosny Fouad Aly 《Computers, Materials & Continua》 SCIE EI 2022年第12期5641-5653,共13页
Rotman lens,which is a radio frequency beam-former that consists of multiple input and multiple output beam ports,can be used in industrial,scientific,and medical applications as a beam steering device.The input ports... Rotman lens,which is a radio frequency beam-former that consists of multiple input and multiple output beam ports,can be used in industrial,scientific,and medical applications as a beam steering device.The input ports collect the signals to be propagated through the lens cavity toward the output ports before being transmitted by the antenna arrays to the destination in order to enhance the error performance by optimizing the overall signal to noise ratio(SNR).In this article,a low-cost Rotman lens antenna is designed and deployed to enhance the overall performance of the conventional cooperative communication systems without needing any additional power,extra time or frequency slots.In the suggested system,the smart Rotman lens antennas generate a beam steering in the direction of the destination to maximize the received SNR at the destination by applying the proposed optimal beamforming technique.The suggested optimal beamforming technique enjoys high diversity,as well as,low encoding and decoding complexity.Furthermore,we proved the advantages of our suggested strategy through both theoretical results and simulations using Monte Carlo runs.The Monte Carlo simulations show that the suggested strategy enjoys better error performance compared to the current state-of-the-art distributed multiantenna strategies.In addition,the bit error rate(BER)curves drawn from the analytical results are closely matching to those drawn from our conducted Monte Carlo simulations. 展开更多
关键词 Performance analysis smart antenna Rotman lens antenna multiantenna systems wireless relay networks cooperative diversity schemes digital network coding relay selection schemes
下载PDF
Low-profile microwave lens antenna based on isotropic Huygens' metasurfaces
5
作者 Wang Zhengbin Wang Haofang +3 位作者 Dong Zhuangli Wu Zhihang Zhang Yerong Zhou Zhipeng 《The Journal of China Universities of Posts and Telecommunications》 EI CSCD 2017年第4期10-15,共6页
An isotropic electromagnetic (EM) lens based on Huygens' metasurface is proposed for 28.0 GHz lens antenna design. The lens consists of a series of non-resonant and subwavelength metallic patterns etched on both si... An isotropic electromagnetic (EM) lens based on Huygens' metasurface is proposed for 28.0 GHz lens antenna design. The lens consists of a series of non-resonant and subwavelength metallic patterns etched on both sides of an ultrathin dielectric substrate. Both electric and magnetic responses are introduced to realize desired abrupt phase change and high-efficiency transmission for the secondary wavelets in the incident wavefront. Then, a substrate-integrated waveguide (SIW) fed patch antenna is combined with the lens as the primary feed to form a low-profile lens antenna system. The simulated and measured results coincide with each other, and demonstrate that the prototype realizes 8.8 dB-12.6 dB gain increment and low side-lobe levels over the bandwidth of 26.7 GHz-30.0 GHz. The novel design leads to a low-profile, light weight, and low-cost antenna solution in a wireless communication system. 展开更多
关键词 microwave lens antenna Huygens' principle metasurface low-profile
原文传递
Optical Antenna System Design for 3D Imaging Lidar
6
作者 Hua-Jun Yang Xiao-Ping Huang 《Journal of Electronic Science and Technology》 CAS 2011年第1期67-70,共4页
A new aspheric surface pre-collimation lenses system for the optical antenna of three-dimensional (3D) imaging of lidar has been optimally designed and simulated by optical design software CODE-V.Four kinds of asphe... A new aspheric surface pre-collimation lenses system for the optical antenna of three-dimensional (3D) imaging of lidar has been optimally designed and simulated by optical design software CODE-V.Four kinds of aspheric surfaces spherical lenses including the sections of spherical,elliptical,hyperbola,and parabola have been researched.The optical system,including the elliptical cylinder lenses collimation and the optical antenna,can be realized less than 5 rad collimation angle for dot source semiconductor laser beam. 展开更多
关键词 Aspheric surface pre-collimation lenses system optical antenna three-dimensional imaging lidar.
下载PDF
近距离散射测量用Ka波段紧凑型阵列天线
7
作者 王辉 苗俊刚 姜景山 《北京航空航天大学学报》 EI CAS CSCD 北大核心 2010年第11期1378-1381,共4页
设计了一种工作于Ka波段的、用于近距离散射测量的四单元紧凑型阵列天线,在阵列近场实现了较均匀的幅相分布.辐射单元由角锥喇叭天线和E面金属板透镜天线组成.馈电网络由魔T、弯波导组成,为各辐射单元提供等幅同相馈电.采用阵列形式和... 设计了一种工作于Ka波段的、用于近距离散射测量的四单元紧凑型阵列天线,在阵列近场实现了较均匀的幅相分布.辐射单元由角锥喇叭天线和E面金属板透镜天线组成.馈电网络由魔T、弯波导组成,为各辐射单元提供等幅同相馈电.采用阵列形式和采用透镜调节喇叭口面相位,都较大程度地减小了阵列的纵向尺寸,且电性能也有明显改善.给出了阵列天线近场的测试结果,并对测试结果进行了分析.在距离阵列口面0.5 m处,在与阵列宽度相同的范围内,幅度和相位波动分别在±2.5 dB和±25°左右. 展开更多
关键词 天线 阵列 透镜 散射 近场
原文传递
Application of the condenser lens in microwave hyperthermia 被引量:2
8
作者 SUN Bing JIANG GuoTai +1 位作者 CHEN ZhiHong WANG Li 《Science China(Technological Sciences)》 SCIE EI CAS 2011年第1期237-243,共7页
According to the aplanatism theory, lens can be used to focus the electromagnetic wave. A piano-convex hyperboloid of revo- lution lens made of low loss material is designed for combinatorial applications with the rec... According to the aplanatism theory, lens can be used to focus the electromagnetic wave. A piano-convex hyperboloid of revo- lution lens made of low loss material is designed for combinatorial applications with the rectangle microstrip applicator in microwave hyperthermia. Results of the extensive simulations and experiments show that the introduction of the lens to the clinical used antenna can significantly improve the directivity and hence increase the microwave power density in near field. In microwave hyperthermia applications, the lens antenna will exhibit superior directivity, high gain and well thermal efficiency for tumor in superficial layer. Besides, it has small treatment area that is helpful for reducing the injury of the normal tissue around the tumor. 展开更多
关键词 condenser lens microwave hyperthermia lens antenna
原文传递
Compound parabolic concentrator applied as receiving antenna in scattering optical communication 被引量:1
9
作者 方靖岳 张海良 +3 位作者 贾红辉 尹红伟 常胜利 秦石乔 《Chinese Optics Letters》 SCIE EI CAS CSCD 2010年第5期478-481,共4页
The two-dimensional(2D) compound parabolic concentrator's(CPC) characteristics are analyzed.It is shown that CPC's height is taller and its light collecting ability is stronger with the CPC's field of view decr... The two-dimensional(2D) compound parabolic concentrator's(CPC) characteristics are analyzed.It is shown that CPC's height is taller and its light collecting ability is stronger with the CPC's field of view decreasing when the bottom radius is unchanged.According to the ZEMAX analysis,CPC is good at collecting optical signal,and the antenna combining CPC with hemispherical lens can gather more optical signal than a single CPC or CPCs combined in series.The light propagation of scattering optical communication based on multiple scattering is simulated by Monte Carlo method,and the results show that using CPC as receiving antenna can strengthen communication system's signal collecting ability and increase its communication distance. 展开更多
关键词 Communication systems Concentration (process) lens antennas Light propagation Monte Carlo methods Optical signal processing Parabolic antennas Receiving antennas SCATTERING
原文传递
Bifocal-Lens Converging Based OAM Wireless Communications
10
作者 Shanghua Gao Wenchi Cheng Hailin Zhang 《Journal of Communications and Information Networks》 CSCD 2019年第2期89-100,共12页
Orbital angular momentum(OAM)based radio vortex wireless communications have received much attention recently because it can significantly increase the spectrum efficiency.The uniform circular array(UCA)is a simple an... Orbital angular momentum(OAM)based radio vortex wireless communications have received much attention recently because it can significantly increase the spectrum efficiency.The uniform circular array(UCA)is a simple antenna structure for high spectrum efficiency radio vortex wireless communications.How-ever,the OAM based electromagnetic waves are vortically hollow and divergent,which may result in the signal loss.Moreover,the divergence of corresponding OAM based electromagnetic wave increases as the order of OAM-mode increases.Therefore,it is difficult to use high-order OAM-mode,because the corresponding received signal-to-noise ratio(SNR)is very small.To overcome the difficulty of high-order OAM modes transmission,in this paper we propose a lens antenna based electromagnetic waves converging scheme,which maintains the angular identification of multiple OAM-modes for radio vortex wireless communications.We further develop a bifocal lens antenna to not only converge the electromagnetic wave,but also compensate the SNR loss on traditional electromagnetic waves.Simulation results show that the proposed bifocal lens can converge the OAM waves into cylinder-like beams,providing an efficient way to in-crease the spectrum efficiency of wireless communications. 展开更多
关键词 OAM bifocal lens antenna CONVERGENCE UCA wireless communications spectrum efficiency
原文传递
Theory, experiment and applications of metamaterials 被引量:2
11
作者 TANG WenXuan MEI ZhongLei CUI TieJun 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第12期142-152,共11页
In this review article, a brief introduction on the theory, experiments and applications of metamaterials is presented. The main focuses are concentrated on the composing meta-atoms, the method of transformation optic... In this review article, a brief introduction on the theory, experiments and applications of metamaterials is presented. The main focuses are concentrated on the composing meta-atoms, the method of transformation optics, the experimental demonstration of negative refraction, and the realizations of invisibility cloaks and electromagnetic black hole. At the end of this review, some typical applications of metamaterials, including high-performance antennas made of zero-refractive-index materials, inhomogeneous metamaterial lenses, and planar metasurfaces, are introduced in details. 展开更多
关键词 METAMATERIALS transformation optics invisibility cloaks lens antennas metasurfaces
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部