Signal-to-noise ratio （SNR） and channel estimations are critical for 60-GHz communications to track the optimal trans- mission and reception beam pairs. However, the excessive pilot overhead for the estima- tions se...Signal-to-noise ratio （SNR） and channel estimations are critical for 60-GHz communications to track the optimal trans- mission and reception beam pairs. However, the excessive pilot overhead for the estima- tions severely reduces system throughput in fast-rotation scenarios. In order to address this problem, we firstly demonstrate the potential sparseness property of 60-GHz channel in beam tracking; subsequently, via exploiting this property, we propose a novel compressed SNR-and-channel estimation. The estimation is conducted in a three-stage fashion, includ- ing the unstructured estimation, nonzero-tap detection, and structured estimation with non- zero-tap location. Numerical simulations show that, in the case of substantial reduction of the pilot overhead, the proposed estimator still reveals a significant improvement in terms of estimation performance over the scheme in IEEE 802.1 lad. Furthermore, it is also demon- strated that the proposed SNR and channel estimators can approach the lower bounds in sparse channels so long as SNR exceeds 8 dB.展开更多
The 60-GHz traveling-wave tube （TWT） prevails nowadays as the amplifier for the satellite communication and electronic countermeasures. The folded waveguide （FW） is a promising all-metal slow-wave structure （SWS...The 60-GHz traveling-wave tube （TWT） prevails nowadays as the amplifier for the satellite communication and electronic countermeasures. The folded waveguide （FW） is a promising all-metal slow-wave structure （SWS） for the 60-GHz TWT with advantages of robust performance, fine heat dissipation, considerable power and bandwidth. A novel FW periodically loaded with rectangular grooves is analyzed for the purpose of gaining higher power and gain. The rf characteristics are investigated by numerical simulation, and the nonlinear large- signal performance of such a TWT is analyzed by a 3I） particle-in-cell code MAGIC. Compared with normal circuits, relatively higher continuous-wave power （40-56 W） and similar bandwidth （5 GHz） are predicted by simulation. Meanwhile, the designed operation voltage is 10.5 kV, which keeps the low-voltage advantage of the popular helix TWT competitor. The novel FW will favor the design of a broadband and high-power 60-GHz TWT展开更多
A type of millimeter-wave antenna array with flexible design is proposed for a variety of applications at 60 GHz.The antenna array can be adjusted to be linearly or circularly polarized by simply changing the radiatio...A type of millimeter-wave antenna array with flexible design is proposed for a variety of applications at 60 GHz.The antenna array can be adjusted to be linearly or circularly polarized by simply changing the radiation part of the antenna array.High gain,wideband,and high radiation efficiency characteristics can be achieved by adopting a low insertion loss feeding network and broadband antenna elements.For the linearly polarized antenna array,simulation results show that the impedance bandwidth of the 2×2 antenna subarray reaches 21.6%,while the maximum gain achieves 15.1 dBi and has a fluctuation of less than 0.4 dBi within the working bandwidth.Simulation results of the 8×8 linearly polarized antenna array show a bandwidth of 21.6%and a gain of(26.1±1)dBi with an antenna efficiency of more than 80%.For the 8×8 circularly polarized antenna array,simulation results show that an impedance bandwidth of 18.2%and an axial ratio(AR)bandwidth of 13.3%are obtained.Gain and efficiency of up to 27.6 dBi and 80%are achieved,respectively.A prototype of antenna array is fabricated,and results are compared and analyzed.展开更多
This design is presented of a 2 × 2 planar array, with a half-wave dipole antenna to be its element, on a new substrate material, Schott Borofloat, with CMOS technology in the 60 GHz band. In the proposed structu...This design is presented of a 2 × 2 planar array, with a half-wave dipole antenna to be its element, on a new substrate material, Schott Borofloat, with CMOS technology in the 60 GHz band. In the proposed structure, all the designs are based on the CMOS technology and similar performance could be achieved with the same size in contrast to the design on low-temperature co-fired ceramic （LTCC）. This could lead to the improving of the compatibility with the CMOS IC process, the design cost and the design precision which is restricted in the LTCC process. The simulated-10 dB bandwidth of the array is from 58 to 64 GHz. A peak gain of 9.4 dBi is achieved. Good agreement on return loss is achieved between simulations and measurements.展开更多
We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.With the glass integrated passive device manufacturing technology,we introduce a coplanar-waveguide-fed(CPW-fed)ring re...We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.With the glass integrated passive device manufacturing technology,we introduce a coplanar-waveguide-fed(CPW-fed)ring resonator to characterize the material properties of the glass substrate.The proposed antenna is designed on a high dielectric constant glass substrate to achieve antenna miniaturization.Because of the existence of gaps between patch units compared with the conventional rectangular patch in the TM10 mode,the radiation aperture of this proposed antenna is reduced.Located right above the center feeding CPW-fed bow-tie slot,the metasurface patch is realized,supporting the TM10 mode and antiphase TM20 mode simultaneously to improve the bandwidth performance.Using a probe-based antenna measurement setup,the antenna prototype is measured,demonstrating a 10-dB impedance bandwidth from 53.3 to 67 GHz.At 60 GHz,the antenna gain measured is about 5 dBi in the boresight direction with a compact radiation aperture of 0.31λ0×0.31λ0 and a thickness of 0.06λ0.展开更多
基金supported by the National Natural Science Foundation of China(NSFC) under Grant No.61201189 and 61132002National High Tech(863) Projects under Grant No.2011AA010202+1 种基金Research Fund of Tsinghua University under Grant No.2011Z05117 and 20121087985Shenzhen Strategic Emerging Industry Development Special Funds under Grant No. CXZZ20120616141708264
文摘Signal-to-noise ratio （SNR） and channel estimations are critical for 60-GHz communications to track the optimal trans- mission and reception beam pairs. However, the excessive pilot overhead for the estima- tions severely reduces system throughput in fast-rotation scenarios. In order to address this problem, we firstly demonstrate the potential sparseness property of 60-GHz channel in beam tracking; subsequently, via exploiting this property, we propose a novel compressed SNR-and-channel estimation. The estimation is conducted in a three-stage fashion, includ- ing the unstructured estimation, nonzero-tap detection, and structured estimation with non- zero-tap location. Numerical simulations show that, in the case of substantial reduction of the pilot overhead, the proposed estimator still reveals a significant improvement in terms of estimation performance over the scheme in IEEE 802.1 lad. Furthermore, it is also demon- strated that the proposed SNR and channel estimators can approach the lower bounds in sparse channels so long as SNR exceeds 8 dB.
基金Supported by the National Natural Science Foundation of China under Grant No 61271029the National Science Fund for Distinguished Young Scholars of China under Grant No 61125103the National Research Foundation of Korea under Grant No MSIP:NRF-2009-0083512
文摘The 60-GHz traveling-wave tube （TWT） prevails nowadays as the amplifier for the satellite communication and electronic countermeasures. The folded waveguide （FW） is a promising all-metal slow-wave structure （SWS） for the 60-GHz TWT with advantages of robust performance, fine heat dissipation, considerable power and bandwidth. A novel FW periodically loaded with rectangular grooves is analyzed for the purpose of gaining higher power and gain. The rf characteristics are investigated by numerical simulation, and the nonlinear large- signal performance of such a TWT is analyzed by a 3I） particle-in-cell code MAGIC. Compared with normal circuits, relatively higher continuous-wave power （40-56 W） and similar bandwidth （5 GHz） are predicted by simulation. Meanwhile, the designed operation voltage is 10.5 kV, which keeps the low-voltage advantage of the popular helix TWT competitor. The novel FW will favor the design of a broadband and high-power 60-GHz TWT
文摘A type of millimeter-wave antenna array with flexible design is proposed for a variety of applications at 60 GHz.The antenna array can be adjusted to be linearly or circularly polarized by simply changing the radiation part of the antenna array.High gain,wideband,and high radiation efficiency characteristics can be achieved by adopting a low insertion loss feeding network and broadband antenna elements.For the linearly polarized antenna array,simulation results show that the impedance bandwidth of the 2×2 antenna subarray reaches 21.6%,while the maximum gain achieves 15.1 dBi and has a fluctuation of less than 0.4 dBi within the working bandwidth.Simulation results of the 8×8 linearly polarized antenna array show a bandwidth of 21.6%and a gain of(26.1±1)dBi with an antenna efficiency of more than 80%.For the 8×8 circularly polarized antenna array,simulation results show that an impedance bandwidth of 18.2%and an axial ratio(AR)bandwidth of 13.3%are obtained.Gain and efficiency of up to 27.6 dBi and 80%are achieved,respectively.A prototype of antenna array is fabricated,and results are compared and analyzed.
文摘This design is presented of a 2 × 2 planar array, with a half-wave dipole antenna to be its element, on a new substrate material, Schott Borofloat, with CMOS technology in the 60 GHz band. In the proposed structure, all the designs are based on the CMOS technology and similar performance could be achieved with the same size in contrast to the design on low-temperature co-fired ceramic （LTCC）. This could lead to the improving of the compatibility with the CMOS IC process, the design cost and the design precision which is restricted in the LTCC process. The simulated-10 dB bandwidth of the array is from 58 to 64 GHz. A peak gain of 9.4 dBi is achieved. Good agreement on return loss is achieved between simulations and measurements.
基金supported by the National Key R&D Program of China(Nos.2018YFE0205900 and 2016YFC0800400)the National Science and Technology Major Project,China(No.2018ZX03001008)the National Natural Science Foundation of China(Nos.61306030 and 61674037)。
文摘We propose a miniaturized wideband metasurface antenna for 60-GHz antenna-in-package applications.With the glass integrated passive device manufacturing technology,we introduce a coplanar-waveguide-fed(CPW-fed)ring resonator to characterize the material properties of the glass substrate.The proposed antenna is designed on a high dielectric constant glass substrate to achieve antenna miniaturization.Because of the existence of gaps between patch units compared with the conventional rectangular patch in the TM10 mode,the radiation aperture of this proposed antenna is reduced.Located right above the center feeding CPW-fed bow-tie slot,the metasurface patch is realized,supporting the TM10 mode and antiphase TM20 mode simultaneously to improve the bandwidth performance.Using a probe-based antenna measurement setup,the antenna prototype is measured,demonstrating a 10-dB impedance bandwidth from 53.3 to 67 GHz.At 60 GHz,the antenna gain measured is about 5 dBi in the boresight direction with a compact radiation aperture of 0.31λ0×0.31λ0 and a thickness of 0.06λ0.
