A dual-band and high-isolation shared-aperture antenna for unmanned aerial vehicle(UAV)platforms has been proposed.This shared-aperture antenna consists of a rectangular monopole antenna and a 4-element multiple input...A dual-band and high-isolation shared-aperture antenna for unmanned aerial vehicle(UAV)platforms has been proposed.This shared-aperture antenna consists of a rectangular monopole antenna and a 4-element multiple input multiple output(MIMO)antenna.In order to increase the isolation,several double split ring metamaterial(MTM)structures are introduced between antenna elements.The antenna radiator and the MTM structure are located on the front and back of the same dielectric substrate,respectively,and are perpendicular to a circular metal plate.The overall size of the antenna substrate is 124 mm×38 mm×1.016 mm.Moreover,the antenna prototype is constructed and measured,and the simulated and measured results are in good agreement.The measured results show that the-10 dB bandwidth of the monopole antenna is 1.92 GHz to 2.75 GHz,and the common-6.0 dB bandwidth of the MIMO antenna element is 4.75 GHz to 4.91 GHz,covering 2.2 GHz to 2.4 GHz in the S-band and 4.8 GHz to 4.9 GHz in the 5G band,respectively.In the 5G band,the isolation between any element of the MIMO antenna and the S-band monopole antenna is not less than 21 dB,and the isolation between the MIMO antenna elements is better than 23 dB,indicating t-hat the isolation between the antenna elements is high.The proposed antenna is suitable for the application on UAV airborne platforms.展开更多
Most of existing metasurfaces usually have limited channel behavior,which seriouslyhinders their development and application.In this paper,we propose a multi-channel terahertz focused beam generator based on shared-ap...Most of existing metasurfaces usually have limited channel behavior,which seriouslyhinders their development and application.In this paper,we propose a multi-channel terahertz focused beam generator based on shared-aperture metasurface,and the generator consists of a top square metal strip,a middle layer of silica and a metal bottom plate.By changing the position and size of the shared-aperture array,the designed metasurface can generate any number of multi-channel focusing beams at different predicted positions.In addition,the energy intensity of focusing beams can be controlled.The full-wave simulation results show that the metasurface achieves four-channel vortex focused beam generation with different topological charges,and five-,six-,eight-channel focused beam generation with different energy intensities at a frequency of 1 THz,which are in good agreement with the theoretically calculated predictions.This work can provide a new idea for designing the terahertz multichannel devices.展开更多
The progress in dual-band dual-polarization(DBDP)shared-aperture antennas for the synthetic aperture radar(SAR)application in the last decade is reviewed.Several designs of DBDP SAR antenna arrays are introduced with ...The progress in dual-band dual-polarization(DBDP)shared-aperture antennas for the synthetic aperture radar(SAR)application in the last decade is reviewed.Several designs of DBDP SAR antenna arrays are introduced with their main performances,then their comparison is summarized.In addition,some techniques enhancing DBDP antenna performances are presented.展开更多
A low-profile dual-broadband dual-circularly-polarized(dual-CP)reflectarray(RA)is proposed and demonstrated,supporting independent beamforming for right-/left-handed CP waves at both K-band and Ka-band.Such functional...A low-profile dual-broadband dual-circularly-polarized(dual-CP)reflectarray(RA)is proposed and demonstrated,supporting independent beamforming for right-/left-handed CP waves at both K-band and Ka-band.Such functionality is achieved by incorporating multi-layered phase shifting elements individually operating in the K-and Ka-band,which are then interleaved in a shared aperture,resulting in a cell thickness of only about O.1az.By rotating the designed K-and Ka-band elements around their own geometrical centers,the dual-CP waves in each band can be modulated separately.To reduce the overall profile,planar K-/Ka-band dual-CP feeds with a broad band are designed based on the magnetoelectric dipoles and multi-branch hybrid couplers.The planar feeds achieve bandwidths of about 32%and 26%at K-and Ka-band respectively with reflection magnitudes below-13 dB,an axial ratio smaller than 2 dB,and a gain variation of less than 1 dB.A proof-of-concept dual-band dual-CP RA integrated with the planar feeds is fabricated and characterized which is capable of generating asymmetrically distributed dual-band dual-CP beams.The measured peak gain values of the beams are around 24.3 and 27.3 dBic,with joint gain variation<1 dB and axial ratio<2 dB bandwidths wider than 20.6%and 14.6%at the lower and higher bands,respectively.The demonstrated dual-broadband dual-CP RA with four degrees of freedom of beamforming could be a promising candidate for space and satellite communications.展开更多
基金supported by the National Natural Science Foundation of China under Grants No.61801406 and No.U23A20651in part by the Research Fund of Sichuan Provincial under Grants No.2024NSFSC0478 and No.2022YFG0259+1 种基金in part by the Research Fund of Key R&D Projects in Sichuan Province under Grant No.2022-ZY00-00009-GXin part by the Mianyang Central Guiding Local Science and Technology Development Fund Project under Grants No.2023ZYDF002 and No.2023ZYDF092.
文摘A dual-band and high-isolation shared-aperture antenna for unmanned aerial vehicle(UAV)platforms has been proposed.This shared-aperture antenna consists of a rectangular monopole antenna and a 4-element multiple input multiple output(MIMO)antenna.In order to increase the isolation,several double split ring metamaterial(MTM)structures are introduced between antenna elements.The antenna radiator and the MTM structure are located on the front and back of the same dielectric substrate,respectively,and are perpendicular to a circular metal plate.The overall size of the antenna substrate is 124 mm×38 mm×1.016 mm.Moreover,the antenna prototype is constructed and measured,and the simulated and measured results are in good agreement.The measured results show that the-10 dB bandwidth of the monopole antenna is 1.92 GHz to 2.75 GHz,and the common-6.0 dB bandwidth of the MIMO antenna element is 4.75 GHz to 4.91 GHz,covering 2.2 GHz to 2.4 GHz in the S-band and 4.8 GHz to 4.9 GHz in the 5G band,respectively.In the 5G band,the isolation between any element of the MIMO antenna and the S-band monopole antenna is not less than 21 dB,and the isolation between the MIMO antenna elements is better than 23 dB,indicating t-hat the isolation between the antenna elements is high.The proposed antenna is suitable for the application on UAV airborne platforms.
基金Project supported by the National Natural Science Foundation of China (Grant No.62271460)the Zhejiang Key Research and Development Project,China (Grant Nos.2021C03153 and 2022C03166)。
文摘Most of existing metasurfaces usually have limited channel behavior,which seriouslyhinders their development and application.In this paper,we propose a multi-channel terahertz focused beam generator based on shared-aperture metasurface,and the generator consists of a top square metal strip,a middle layer of silica and a metal bottom plate.By changing the position and size of the shared-aperture array,the designed metasurface can generate any number of multi-channel focusing beams at different predicted positions.In addition,the energy intensity of focusing beams can be controlled.The full-wave simulation results show that the metasurface achieves four-channel vortex focused beam generation with different topological charges,and five-,six-,eight-channel focused beam generation with different energy intensities at a frequency of 1 THz,which are in good agreement with the theoretically calculated predictions.This work can provide a new idea for designing the terahertz multichannel devices.
基金supported by the National High-Technology Research and Development (863)Project of China (No.2007AA12Z125)the National Natural Science Foundation of China (Grant No.60871030)the Specialized Research Fund of Doctoral Programs,Ministry of Education of China (No.20050280016).
文摘The progress in dual-band dual-polarization(DBDP)shared-aperture antennas for the synthetic aperture radar(SAR)application in the last decade is reviewed.Several designs of DBDP SAR antenna arrays are introduced with their main performances,then their comparison is summarized.In addition,some techniques enhancing DBDP antenna performances are presented.
基金supported by the National Natural Science Foundation of China(Nos.62122019,62293492,and 61901106)the ZTE Corporation and the State Key Laboratory of Mobile Network and Mobile Multimedia Technology,and the Fundamental Research Funds for Central Universities,China(No.2242022k60008)。
文摘A low-profile dual-broadband dual-circularly-polarized(dual-CP)reflectarray(RA)is proposed and demonstrated,supporting independent beamforming for right-/left-handed CP waves at both K-band and Ka-band.Such functionality is achieved by incorporating multi-layered phase shifting elements individually operating in the K-and Ka-band,which are then interleaved in a shared aperture,resulting in a cell thickness of only about O.1az.By rotating the designed K-and Ka-band elements around their own geometrical centers,the dual-CP waves in each band can be modulated separately.To reduce the overall profile,planar K-/Ka-band dual-CP feeds with a broad band are designed based on the magnetoelectric dipoles and multi-branch hybrid couplers.The planar feeds achieve bandwidths of about 32%and 26%at K-and Ka-band respectively with reflection magnitudes below-13 dB,an axial ratio smaller than 2 dB,and a gain variation of less than 1 dB.A proof-of-concept dual-band dual-CP RA integrated with the planar feeds is fabricated and characterized which is capable of generating asymmetrically distributed dual-band dual-CP beams.The measured peak gain values of the beams are around 24.3 and 27.3 dBic,with joint gain variation<1 dB and axial ratio<2 dB bandwidths wider than 20.6%and 14.6%at the lower and higher bands,respectively.The demonstrated dual-broadband dual-CP RA with four degrees of freedom of beamforming could be a promising candidate for space and satellite communications.
