This paper proposes a low-profile, aperture-shared dual-band bidirectional circularly polarized (CP) antenna. The design incorporates a partially reflective surface (PRS) and a multifunctional transmission-reflection ...This paper proposes a low-profile, aperture-shared dual-band bidirectional circularly polarized (CP) antenna. The design incorporates a partially reflective surface (PRS) and a multifunctional transmission-reflection integrated metasurface, enabling the integration of CP Fabry-Pérot cavity antenna (FPCA) and CP folded reflectarray (FRA), while preserving circular polarization purity and delivering high gain performance. In this design, the PRS acts as the reflector for the FRA at 8 GHz, while the multifunctional metasurface serves as the reflector for the FPCA at 8 GHz and provides phase compensation for the FRA at 13 GHz. Consequently, the FPCA and FRA can share the same aperture with high aperture reuse efficiency. The antenna achieves high gain across both frequency bands, with peak gains of 19.4 dBic and 22.8 dBic, respectively, without complex feeding networks. Leveraging the advantage of low focal-length-to-diameter ratio of the FRA, the array’s profile is reduced, with a height-to-diameter ratio of only 0.46.展开更多
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
A high efficient C-band circularly polarized rectenna array with low-profile and lightweight for wireless power transmission of space solar power stations is proposed and designed in this paper.The receiving antenna i...A high efficient C-band circularly polarized rectenna array with low-profile and lightweight for wireless power transmission of space solar power stations is proposed and designed in this paper.The receiving antenna is an aperture-coupled microstrip quasi-square patch.The patch simultaneously excites two orthogonal modes of TM_(10)and TM_(01),which have a phase difference of 90◦by the perturbation method,so that the antenna operates in a circularly polarized state.The rectifier circuit is designed by microstrip lines in a parallel topology,and it consists of a stepped impedance matching network,a Schottky diode,two sector-branches as pass-through filter and a load.The input impedance of the rectifier and the characteristic impedance of the antenna feedline are both 50Ωfor being directly integrated into a rectenna.This rectenna has the advantages of low profile and scalability.The rectenna element,3×3 and 4×4 subarrays are simulated and tested with good agreement being obtained.The measured results show that the rectification efficiencies of the element and the two subarrays are 73.1%,72.7%,and 71.3%respectively at the center frequency of 5.76 GHz.Finally,a large rectenna array with 0.7 m aperture is designed to verify the scalability of the design.It will obtain 16.7 W of DC power at an efficiency of 65%.The rectenna has a profile of 1.61 mm and a surface density of less than 1.2 kg/m2.展开更多
A low-profile,vertically polarized,ultra-wideband array antenna with end-fire beams operating in an ultra-high frequency(UHF)band is developed in this paper.The array antenna consists of 1×16 log-periodic top-hat...A low-profile,vertically polarized,ultra-wideband array antenna with end-fire beams operating in an ultra-high frequency(UHF)band is developed in this paper.The array antenna consists of 1×16 log-periodic top-hat loaded monopole antenna arrays and is feasible to embed into a shallow cavity to further reduce the array height.Capacitance is introduced in the proposed antenna element to reduce profile height and the rectangular top hats are carefully designed to minimize the transverse dimension.Simulated results show that when the antenna array operates in a frequency range of 300 MHz-900 MHz,the end-fire radiation pattern achieves±45°scanning range in the horizontal plane.Then prototypes of the proposed end-fire antenna element and a uniformly spaced linear array(1×2)are fabricated and validated.The end-fire antenna array should be suitable for airborne applications where low-profile and conformal scanning phased antenna arrays with end-fire radiations are required.This design is attractive for airborne platform applications that are used to search,discover,identify,and scout the aerial target with vertically polarized beams.展开更多
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
The objective of this paper is to design a microstrip patch antenna for the miniature electro-capsule communicating with external recorder at 915MHz located in Industry, Science, and Medical (ISM) bands. Microstrip an...The objective of this paper is to design a microstrip patch antenna for the miniature electro-capsule communicating with external recorder at 915MHz located in Industry, Science, and Medical (ISM) bands. Microstrip antenna design parameters, resonance characteristics and radiation patterns are evaluated using the finite-difference time-domain (FDTD) method. The effects of location of feed point and human body are analyzed, and the radiation performances of the proposed antenna are estimated in terms of radiation patterns. Finally, specific absorption rate (SAR) computations are also performed, and the peak 1-g and 10-g SAR values are calculated. According to peak SAR values, the maximum delivered power for the designed antenna was found so that the SAR values of the antennas satisfy ANSI limitations.展开更多
This article proposes a novel antenna structure by slot loading method based on the planar inverted F antenna （PIFA）, which is fed by coaxial probe. The antenna structure consists of a new and flexible slot array in...This article proposes a novel antenna structure by slot loading method based on the planar inverted F antenna （PIFA）, which is fed by coaxial probe. The antenna structure consists of a new and flexible slot array including five slots. To reveal the mechanism of slot loading in creating new and broad frequency band, the article discusses the performance of the five slots in detail. Simulations with Ansoft HFSS 10.0 indicate that the - 10 dB relative impedance bandwidth can reach 17.2%, 8.9% and 12.1% that covers 2.40/3.30/5.15/5.725 GHz wireless local area network （WLAN） and world interoperability for microwave access （WiMAX） bands. Meanwhile, the antenna has stable radiation pattern, high gain and low profile. Especially, the slot array is flexible and capable of being realized in various application cases. Actually the design reaches broadband, multi-band, miniaturization, high gain and is easy to fabricate.展开更多
文摘This paper proposes a low-profile, aperture-shared dual-band bidirectional circularly polarized (CP) antenna. The design incorporates a partially reflective surface (PRS) and a multifunctional transmission-reflection integrated metasurface, enabling the integration of CP Fabry-Pérot cavity antenna (FPCA) and CP folded reflectarray (FRA), while preserving circular polarization purity and delivering high gain performance. In this design, the PRS acts as the reflector for the FRA at 8 GHz, while the multifunctional metasurface serves as the reflector for the FPCA at 8 GHz and provides phase compensation for the FRA at 13 GHz. Consequently, the FPCA and FRA can share the same aperture with high aperture reuse efficiency. The antenna achieves high gain across both frequency bands, with peak gains of 19.4 dBic and 22.8 dBic, respectively, without complex feeding networks. Leveraging the advantage of low focal-length-to-diameter ratio of the FRA, the array’s profile is reduced, with a height-to-diameter ratio of only 0.46.
基金supported by the National Natural Science Foundation of China (61401229)the Science and Technology Project of Jiangsu Province (BE2015002-2)+1 种基金the Open Research Program of the State Key Laboratory of Millimeter Waves (K201616)the Nanjing University of Posts and Telecommunications Scientific Foundation (NY215137)
文摘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.
基金supported by the National Natural Science Founda-tions of China under Grant 62171270.
文摘A high efficient C-band circularly polarized rectenna array with low-profile and lightweight for wireless power transmission of space solar power stations is proposed and designed in this paper.The receiving antenna is an aperture-coupled microstrip quasi-square patch.The patch simultaneously excites two orthogonal modes of TM_(10)and TM_(01),which have a phase difference of 90◦by the perturbation method,so that the antenna operates in a circularly polarized state.The rectifier circuit is designed by microstrip lines in a parallel topology,and it consists of a stepped impedance matching network,a Schottky diode,two sector-branches as pass-through filter and a load.The input impedance of the rectifier and the characteristic impedance of the antenna feedline are both 50Ωfor being directly integrated into a rectenna.This rectenna has the advantages of low profile and scalability.The rectenna element,3×3 and 4×4 subarrays are simulated and tested with good agreement being obtained.The measured results show that the rectification efficiencies of the element and the two subarrays are 73.1%,72.7%,and 71.3%respectively at the center frequency of 5.76 GHz.Finally,a large rectenna array with 0.7 m aperture is designed to verify the scalability of the design.It will obtain 16.7 W of DC power at an efficiency of 65%.The rectenna has a profile of 1.61 mm and a surface density of less than 1.2 kg/m2.
文摘A low-profile,vertically polarized,ultra-wideband array antenna with end-fire beams operating in an ultra-high frequency(UHF)band is developed in this paper.The array antenna consists of 1×16 log-periodic top-hat loaded monopole antenna arrays and is feasible to embed into a shallow cavity to further reduce the array height.Capacitance is introduced in the proposed antenna element to reduce profile height and the rectangular top hats are carefully designed to minimize the transverse dimension.Simulated results show that when the antenna array operates in a frequency range of 300 MHz-900 MHz,the end-fire radiation pattern achieves±45°scanning range in the horizontal plane.Then prototypes of the proposed end-fire antenna element and a uniformly spaced linear array(1×2)are fabricated and validated.The end-fire antenna array should be suitable for airborne applications where low-profile and conformal scanning phased antenna arrays with end-fire radiations are required.This design is attractive for airborne platform applications that are used to search,discover,identify,and scout the aerial target with vertically polarized beams.
基金Project supported by the Open Research Program of the State Key Laboratory of Millimeter Waves,China(Grant No.K201926)the Postgraduate Research&Practice Innovation Program of Jiangsu Province,Chinathe Nanjing University of Posts and Telecommunications Scientific Foundation,China(Grant No.NY215137)
文摘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.
文摘The objective of this paper is to design a microstrip patch antenna for the miniature electro-capsule communicating with external recorder at 915MHz located in Industry, Science, and Medical (ISM) bands. Microstrip antenna design parameters, resonance characteristics and radiation patterns are evaluated using the finite-difference time-domain (FDTD) method. The effects of location of feed point and human body are analyzed, and the radiation performances of the proposed antenna are estimated in terms of radiation patterns. Finally, specific absorption rate (SAR) computations are also performed, and the peak 1-g and 10-g SAR values are calculated. According to peak SAR values, the maximum delivered power for the designed antenna was found so that the SAR values of the antennas satisfy ANSI limitations.
基金supported by Chongqing Municipal Education Commission (KJ080516)
文摘This article proposes a novel antenna structure by slot loading method based on the planar inverted F antenna （PIFA）, which is fed by coaxial probe. The antenna structure consists of a new and flexible slot array including five slots. To reveal the mechanism of slot loading in creating new and broad frequency band, the article discusses the performance of the five slots in detail. Simulations with Ansoft HFSS 10.0 indicate that the - 10 dB relative impedance bandwidth can reach 17.2%, 8.9% and 12.1% that covers 2.40/3.30/5.15/5.725 GHz wireless local area network （WLAN） and world interoperability for microwave access （WiMAX） bands. Meanwhile, the antenna has stable radiation pattern, high gain and low profile. Especially, the slot array is flexible and capable of being realized in various application cases. Actually the design reaches broadband, multi-band, miniaturization, high gain and is easy to fabricate.
