This paper presents a novel coupled receiver-transmitter metasurface(MS)which is used to realize a high-aperture-efficiency Fabry-Perot resonator antenna.The unit cell of the MS adopts a slot-coupling procedure to rea...This paper presents a novel coupled receiver-transmitter metasurface(MS)which is used to realize a high-aperture-efficiency Fabry-Perot resonator antenna.The unit cell of the MS adopts a slot-coupling procedure to realize energy transmission from the receiver patch to the radiator patch.This approach makes it easier to independently control the transmission magnitude and phase.Based on this characteristic,the transmission coefficients of different unit cells on the MS can be optimized by a genetic algorithm.Then,nearly uniform electric amplitude and phase distribution across the aperture field of the antenna are achieved.Therefore,the gain and aperture efficiency of the antenna are improved.A prototype of the optimized antenna is fabricated and measured to validate the design.The measured gain of the fabricated antenna reaches 17.3 dBi with an aperture efficiency of 94.5%.A higher aperture efficiency is obtained with the proposed antenna which has a low profile and simple structure.展开更多
Since the scarcity of bandwidth resources has become increasingly critical in modern communication systems,orbital angular momentum(OAM)with a higher degree of freedom in information modulation has become a promising ...Since the scarcity of bandwidth resources has become increasingly critical in modern communication systems,orbital angular momentum(OAM)with a higher degree of freedom in information modulation has become a promising solution to alleviate the shortage of spectrum resources.Consequently,the integration of OAM with millimeter-wave technology has emerged as a focal point in next-generation communication research.Recently,programmable metasurfaces have gained considerable attention as essential devices for OAM generation due to real-time tunability,but their profiles are relatively high as a result of the external feed source.This paper proposes a conformal radiation-type programmable metasurface operating in the millimeter-wave band.By employing a series–parallel hybrid feed network to replace conventional external feed sources,the overall profile of the metasurface system can be reduced to less than 0.1λ.Furthermore,the proposed innovation design could also achieve a conformal cross-shaped architecture,which is ultraportable and very effective in integrating with the front ends of satellites or aircraft and eliminating issues such as feed source blockage as well as energy spillover losses in conventional metasurfaces.The proposed metasurface could achieve a realized gain of 22.54 dB with an aperture efficiency of 21.75%,thus generating high-purity OAM waves with topological charges of l=0,l=+1,l=+2,and l=+3.Additionally,by incorporating beam scanning techniques,OAM waves could be deflected to accommodate scenarios with moving receivers,demonstrating substantial potential for future high-speed wireless communication applications.展开更多
This paper presents a review of transmitarray(TA)and reflectarray(RA)antennas based on the magnetoelectric(ME)dipole antenna struc-ture.First,the basic operating principles of ME dipole,TA and RA antennas are introduc...This paper presents a review of transmitarray(TA)and reflectarray(RA)antennas based on the magnetoelectric(ME)dipole antenna struc-ture.First,the basic operating principles of ME dipole,TA and RA antennas are introduced.Next,ME-dipole-based TA and RA designs are discussed,with four antenna designs presented in detail,including two fixed-beam TA designs with high aperture efficiencies and two reconfigurable designs with a beam-scanning capability.The techniques involved in these designs are also analyzed to provide insight into the ME-dipole-based TA and RA designs.The simulated and measured results of the reported prototypes show that the introduction of the ME dipole antenna significantly broadens the band-widths of the TA and RA antennas not only in the fixed-beam designs but also in the reconfigurable designs.The ME-dipole-based TA and RA designs reported in this paper are compared to highlight their benefits and limitations.Future possible research directions and challenges are also discussed.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant No.61871394)Natural Science Foundation of Shanxi Province,China(Grant No.2020JQ-482).
文摘This paper presents a novel coupled receiver-transmitter metasurface(MS)which is used to realize a high-aperture-efficiency Fabry-Perot resonator antenna.The unit cell of the MS adopts a slot-coupling procedure to realize energy transmission from the receiver patch to the radiator patch.This approach makes it easier to independently control the transmission magnitude and phase.Based on this characteristic,the transmission coefficients of different unit cells on the MS can be optimized by a genetic algorithm.Then,nearly uniform electric amplitude and phase distribution across the aperture field of the antenna are achieved.Therefore,the gain and aperture efficiency of the antenna are improved.A prototype of the optimized antenna is fabricated and measured to validate the design.The measured gain of the fabricated antenna reaches 17.3 dBi with an aperture efficiency of 94.5%.A higher aperture efficiency is obtained with the proposed antenna which has a low profile and simple structure.
基金supported by the Gusu Leading Talents of Innovation and Entrepreneurship(ZXL2024332)the National Natural Science Foundation of China(62471399 and 62401474)+3 种基金the Shanghai Aerospace Science and Technology Innovation Foundation(SAST2023-021)the Basic Research Programs of Taicang(TC2022JC16)the Shanghai Kewei Foundation(22JC1404000 and 24DP1500500)the National Key Research and Development Program of China(2022YFB3806000).
文摘Since the scarcity of bandwidth resources has become increasingly critical in modern communication systems,orbital angular momentum(OAM)with a higher degree of freedom in information modulation has become a promising solution to alleviate the shortage of spectrum resources.Consequently,the integration of OAM with millimeter-wave technology has emerged as a focal point in next-generation communication research.Recently,programmable metasurfaces have gained considerable attention as essential devices for OAM generation due to real-time tunability,but their profiles are relatively high as a result of the external feed source.This paper proposes a conformal radiation-type programmable metasurface operating in the millimeter-wave band.By employing a series–parallel hybrid feed network to replace conventional external feed sources,the overall profile of the metasurface system can be reduced to less than 0.1λ.Furthermore,the proposed innovation design could also achieve a conformal cross-shaped architecture,which is ultraportable and very effective in integrating with the front ends of satellites or aircraft and eliminating issues such as feed source blockage as well as energy spillover losses in conventional metasurfaces.The proposed metasurface could achieve a realized gain of 22.54 dB with an aperture efficiency of 21.75%,thus generating high-purity OAM waves with topological charges of l=0,l=+1,l=+2,and l=+3.Additionally,by incorporating beam scanning techniques,OAM waves could be deflected to accommodate scenarios with moving receivers,demonstrating substantial potential for future high-speed wireless communication applications.
基金supported in part by the Research Grants Council of the Hong Kong SAR,China(Grant Nos.9043154(CityU 11211721)and 9042674(CityU 11217618))the National Natural Science Foundation of China(Grant No.61971370)the Guangdong Provincial Department of Science and Technology,China(Grant No.2020B1212030002).
文摘This paper presents a review of transmitarray(TA)and reflectarray(RA)antennas based on the magnetoelectric(ME)dipole antenna struc-ture.First,the basic operating principles of ME dipole,TA and RA antennas are introduced.Next,ME-dipole-based TA and RA designs are discussed,with four antenna designs presented in detail,including two fixed-beam TA designs with high aperture efficiencies and two reconfigurable designs with a beam-scanning capability.The techniques involved in these designs are also analyzed to provide insight into the ME-dipole-based TA and RA designs.The simulated and measured results of the reported prototypes show that the introduction of the ME dipole antenna significantly broadens the band-widths of the TA and RA antennas not only in the fixed-beam designs but also in the reconfigurable designs.The ME-dipole-based TA and RA designs reported in this paper are compared to highlight their benefits and limitations.Future possible research directions and challenges are also discussed.
