Microwave communication is a modern communication technology with high transmission stability, strong anti-interference capability and large communication capacity. It is widely used in civil and military fields. At p...Microwave communication is a modern communication technology with high transmission stability, strong anti-interference capability and large communication capacity. It is widely used in civil and military fields. At present, the millimeter wave band of microwave has a very wide range of applications in 5G communications, which can achieve rapid transmission and meet the needs of 5G network construction. Therefore, this paper mainly introduces the specific application of 5G microwave communication in 5G backhaul, hoping to provide certain reference value for the development of 5G microwave network construction.展开更多
In the coexisted world of 3G,4G,5G and many other specialized wireless communication systems,billions of connections could be existing for various information transmission types.Unluckily,data show that the increase o...In the coexisted world of 3G,4G,5G and many other specialized wireless communication systems,billions of connections could be existing for various information transmission types.Unluckily,data show that the increase of network capacity is heavily more than the increase of the network energy efficiency in recent years,which could lead to more energy consumption per transmitted bit in the future network.As basic units in mobile communication systems,microwave/RF components and modules play key roles展开更多
In recent years,important progress has been made in the field of biosensing and wireless communications by using metamaterials and metasurfaces.These technologies enable efficient manipulation of electromagnetic waves...In recent years,important progress has been made in the field of biosensing and wireless communications by using metamaterials and metasurfaces.These technologies enable efficient manipulation of electromagnetic waves through judiciously designed subwavelength structural units.This review begins by focusing on the design and optimization of terahertz metasurface sensors,emphasizing their unique advantages in biomedical diagnostics.It explores key technical challenges,such as material selection,device integration,and development of robust sensor for surface-specific modifications.Furthermore,the review discusses how metasurfaces,particularly as reconfigurable intelligent surfaces,dynamically modulate electromagnetic wave propagation in the microwave communications domain to enhance signal quality,improve communication efficiency,and showcase their potential in 5G and future 6G technologies.Finally,a comprehensive overview is provided regarding the challenges and future research directions for metamaterial and metasurface technologies in both biosensing and wireless communications,with the ultimate goal of promoting their applications in point-of-care devices and efficient communication systems.展开更多
Real time monitoring and control of a modern power system has achieved significant development since the incorporation of the phasor measurement unit (PMU). Due to the time-synchronized capabilities, PMU has increased...Real time monitoring and control of a modern power system has achieved significant development since the incorporation of the phasor measurement unit (PMU). Due to the time-synchronized capabilities, PMU has increased the situational awareness (SA) in a wide area measurement system (WAMS). Operator SA depends on the data pertaining to the real-time health of the grid. This is measured by PMUs and is accessible for data analytics at the data monitoring station referred to as the phasor data concentrator (PDC). Availability of the communication system and communication delay are two of the decisive factors governing the operator SA. This paper presents a pragmatic metric to assess the operator SA and ensure optimal locations for the placement of PMUs, PDC, and the underlying communication infrastructure to increase the efficacy of operator SA. The uses of digital elevation model (DEM) data of the surface topography to determine the optimal locations for the placement of the PMU, and the microwave technology for communicating synchrophasor data is another important contribution carried out in this paper. The practical power grid system of Bihar in India is considered as a case study, and extensive simulation results and analysis are presented for validating the proposed methodology.展开更多
Optical beating is the usual approach to generation of microwave signals.However,the highest frequency achievable for microwave signals is limited by the bandwidths of optoelectronic devices.To maximize the microwave ...Optical beating is the usual approach to generation of microwave signals.However,the highest frequency achievable for microwave signals is limited by the bandwidths of optoelectronic devices.To maximize the microwave frequency with a limited bandwidth of a photodetector(PD)and relieve the bandwidth bottleneck,we propose to generate microwave signals with the single sideband(SSB)format by beating a continuous wave(CW)light with an optical SSB signal.By simply adjusting the frequency diference between the CW light and the carrier of the optical SSB signal,the frequency of the generated microwave SSB signal is changed correspondingly.In the experiment,amplitude shift keying(ASK)microwave signals with the SSB format are successfully generated with diferent carrier frequencies and coding bit rates,and the recovered coding information agrees well with the original pseudo random binary sequence(PRBS)of 2^(7)−1 bits.The proposed approach can signifcantly relieve the bandwidth restriction set by optoelectronic devices in high-speed microwave communication systems.展开更多
In microwave communication systems,focusing and imaging have attracted widespread attention due to their application prospects in the information processing and communication fields.Most existing multi-channel focusin...In microwave communication systems,focusing and imaging have attracted widespread attention due to their application prospects in the information processing and communication fields.Most existing multi-channel focusing and imaging are implemented by interleaved metasurfaces.However,the disadvantages of their large size and low efficiency limit their practical applications in large-capacity and low-loss integrated systems.To solve these issues,here,we propose a non-interleaved polarization-frequency multiplexing metasurface for high-efficiency multi-channel focusing and imaging.The meta-atoms of the non-interleaved metasurface are composed of a metallic ground plate,two dielectric layers,a larger cross-shaped metal structure,and a smaller cross-shaped metal structure embedded by a circular metal aperture.By altering the size of two cross-shaped structures,the designed meta-atom can obtain the independent complete 2π phase coverage with high reflection efficiency at two different frequency ranges for two orthogonal linear polarization(LP)incidences,realizing polarization multiplexing and frequency multiplexing.Moreover,two types of metasurfaces based on the above meta-atoms are designed to realize multi-channel focusing and imaging with high efficiency.As a proof,the focusing metasurface is fabricated and measured,and the measured results are well consistent with simulated results.Therefore,the proposed scheme has the advantages of high efficiency,multi-channel,and compact size,which possesses broad application prospects in low-loss and multichannel communication integrated systems.展开更多
文摘Microwave communication is a modern communication technology with high transmission stability, strong anti-interference capability and large communication capacity. It is widely used in civil and military fields. At present, the millimeter wave band of microwave has a very wide range of applications in 5G communications, which can achieve rapid transmission and meet the needs of 5G network construction. Therefore, this paper mainly introduces the specific application of 5G microwave communication in 5G backhaul, hoping to provide certain reference value for the development of 5G microwave network construction.
文摘In the coexisted world of 3G,4G,5G and many other specialized wireless communication systems,billions of connections could be existing for various information transmission types.Unluckily,data show that the increase of network capacity is heavily more than the increase of the network energy efficiency in recent years,which could lead to more energy consumption per transmitted bit in the future network.As basic units in mobile communication systems,microwave/RF components and modules play key roles
基金supported by the National Natural Science Foundation of China(nos.61975163,62275215,62435015,62171165,U23B2014,and U21A6003)Key Core Technology Research Project for Strategic Industry Chains of Xi’an Science and Technology Bureau(23LLRH0057)+2 种基金Key Research and Development Program of Shaanxi Province(2023GXLH-038)Youth Innovation Team of Shaanxi Universities(21JP084)the Doctoral Dissertation Innovation Fund of Xi’an University of Technology(109-252072301).
文摘In recent years,important progress has been made in the field of biosensing and wireless communications by using metamaterials and metasurfaces.These technologies enable efficient manipulation of electromagnetic waves through judiciously designed subwavelength structural units.This review begins by focusing on the design and optimization of terahertz metasurface sensors,emphasizing their unique advantages in biomedical diagnostics.It explores key technical challenges,such as material selection,device integration,and development of robust sensor for surface-specific modifications.Furthermore,the review discusses how metasurfaces,particularly as reconfigurable intelligent surfaces,dynamically modulate electromagnetic wave propagation in the microwave communications domain to enhance signal quality,improve communication efficiency,and showcase their potential in 5G and future 6G technologies.Finally,a comprehensive overview is provided regarding the challenges and future research directions for metamaterial and metasurface technologies in both biosensing and wireless communications,with the ultimate goal of promoting their applications in point-of-care devices and efficient communication systems.
文摘Real time monitoring and control of a modern power system has achieved significant development since the incorporation of the phasor measurement unit (PMU). Due to the time-synchronized capabilities, PMU has increased the situational awareness (SA) in a wide area measurement system (WAMS). Operator SA depends on the data pertaining to the real-time health of the grid. This is measured by PMUs and is accessible for data analytics at the data monitoring station referred to as the phasor data concentrator (PDC). Availability of the communication system and communication delay are two of the decisive factors governing the operator SA. This paper presents a pragmatic metric to assess the operator SA and ensure optimal locations for the placement of PMUs, PDC, and the underlying communication infrastructure to increase the efficacy of operator SA. The uses of digital elevation model (DEM) data of the surface topography to determine the optimal locations for the placement of the PMU, and the microwave technology for communicating synchrophasor data is another important contribution carried out in this paper. The practical power grid system of Bihar in India is considered as a case study, and extensive simulation results and analysis are presented for validating the proposed methodology.
基金the National Natural Science Foundation of China(Grant No.61975249)the National Key Research and Development Program of China(Nos.2018YFB2201700 and 2018YFA0704403)the Program for HUST Academic Frontier Youth Team(No.2018QYTD08).
文摘Optical beating is the usual approach to generation of microwave signals.However,the highest frequency achievable for microwave signals is limited by the bandwidths of optoelectronic devices.To maximize the microwave frequency with a limited bandwidth of a photodetector(PD)and relieve the bandwidth bottleneck,we propose to generate microwave signals with the single sideband(SSB)format by beating a continuous wave(CW)light with an optical SSB signal.By simply adjusting the frequency diference between the CW light and the carrier of the optical SSB signal,the frequency of the generated microwave SSB signal is changed correspondingly.In the experiment,amplitude shift keying(ASK)microwave signals with the SSB format are successfully generated with diferent carrier frequencies and coding bit rates,and the recovered coding information agrees well with the original pseudo random binary sequence(PRBS)of 2^(7)−1 bits.The proposed approach can signifcantly relieve the bandwidth restriction set by optoelectronic devices in high-speed microwave communication systems.
基金National Natural Science Foundation of China(62075052,6227419)National Key Research and Development Program of China(2024YFE0108300)+2 种基金Science and Technology Major Project of Guangxi,China(Gui Ke AA21077015,Gui Ke AA24263032)Science Foundation of the National Key Laboratory of Science and Technology on Advanced Composites in Special Environments(JCKYS2020603C009,6142905212711)Project of Innovative and Entrepreneurship Training Program for College Students in Heilongjiang Province(201810214105)。
文摘In microwave communication systems,focusing and imaging have attracted widespread attention due to their application prospects in the information processing and communication fields.Most existing multi-channel focusing and imaging are implemented by interleaved metasurfaces.However,the disadvantages of their large size and low efficiency limit their practical applications in large-capacity and low-loss integrated systems.To solve these issues,here,we propose a non-interleaved polarization-frequency multiplexing metasurface for high-efficiency multi-channel focusing and imaging.The meta-atoms of the non-interleaved metasurface are composed of a metallic ground plate,two dielectric layers,a larger cross-shaped metal structure,and a smaller cross-shaped metal structure embedded by a circular metal aperture.By altering the size of two cross-shaped structures,the designed meta-atom can obtain the independent complete 2π phase coverage with high reflection efficiency at two different frequency ranges for two orthogonal linear polarization(LP)incidences,realizing polarization multiplexing and frequency multiplexing.Moreover,two types of metasurfaces based on the above meta-atoms are designed to realize multi-channel focusing and imaging with high efficiency.As a proof,the focusing metasurface is fabricated and measured,and the measured results are well consistent with simulated results.Therefore,the proposed scheme has the advantages of high efficiency,multi-channel,and compact size,which possesses broad application prospects in low-loss and multichannel communication integrated systems.
