In this paper, we show that circular polarization-keeping reflection can be achieved using reflective metasurfaces. The underlying physical mechanism of the polarization-keeping reflection is analyzed using a reflecti...In this paper, we show that circular polarization-keeping reflection can be achieved using reflective metasurfaces. The underlying physical mechanism of the polarization-keeping reflection is analyzed using a reflection matrix. A wideband circular polarization-keeping reflector is demonstrated using N-shaped resonators. Both the simulation and experiment results show that the polarization-keeping reflection can be achieved with a high efficiency larger than 98% over the frequency range from 9.2 GHz to 17.7 GHz for both incident left- and right-handed circularly polarized waves. Under oblique incidence, the bandwidth increases as the incident angle varies from 0°to 80°. Moreover, the co-polarization reflection is independent of the incident azimuth angles.展开更多
本文针对目前在智能交通领域受到高度关注的短程通信技术(DSRC:Dedicated Short Range Communications),提出一种用于DSRC的16单元微带天线阵列,其主要用于ETC、智能停车场等系统中的路侧单元(RSU:Road Side Unit);针对传统平面阵列天...本文针对目前在智能交通领域受到高度关注的短程通信技术(DSRC:Dedicated Short Range Communications),提出一种用于DSRC的16单元微带天线阵列,其主要用于ETC、智能停车场等系统中的路侧单元(RSU:Road Side Unit);针对传统平面阵列天线圆极化轴比带宽窄的缺点,采用连续旋转馈电技术的方法来改善其轴比带宽,通过HFSS软件对设计方案进行电磁仿真,得到预期的结果。最后对样品测试发现其相对于传统阵列,轴比带宽提高了3倍以上。展开更多
A practical antenna has been designed and developed for INMARSAT mobile satellite communications. The design uses low cost materials such as foam and copper foil to create a stacked microstrip antenna array. Several t...A practical antenna has been designed and developed for INMARSAT mobile satellite communications. The design uses low cost materials such as foam and copper foil to create a stacked microstrip antenna array. Several techniques were adopted to enhance the impedance bandwidth and axial ratio bandwidth. The final design parameters were optimized by EM simulation. Finally, the L-strip fed six-element stacked microstrip antenna array was constructed and tested. Simulated and measured results show that in the whole INMARSAT work band, the VSWR of the antenna is less than 1.6, its antenna gain is higher than 15dB and wide-angle axial ratio (AR) 3dB is more than 21o. The antenna has been successfully used with a HNS 9201 terminal.展开更多
基金Project supported by the National Natural Science Foundation of China(Grants Nos.61331005,11204378,11274389,11304393,and 61302023)the National Natural Science Foundation of Shaanxi Province,China(Grant Nos.2011JQ8031 and 2013JM6005)
文摘In this paper, we show that circular polarization-keeping reflection can be achieved using reflective metasurfaces. The underlying physical mechanism of the polarization-keeping reflection is analyzed using a reflection matrix. A wideband circular polarization-keeping reflector is demonstrated using N-shaped resonators. Both the simulation and experiment results show that the polarization-keeping reflection can be achieved with a high efficiency larger than 98% over the frequency range from 9.2 GHz to 17.7 GHz for both incident left- and right-handed circularly polarized waves. Under oblique incidence, the bandwidth increases as the incident angle varies from 0°to 80°. Moreover, the co-polarization reflection is independent of the incident azimuth angles.
基金This paper is supported bytwoprojects(2006),Philosophical and social science project ofGuangdongProvince(06E18)The eleventh five-year-programming project of philosophical and social science development ofGuangzhou(06- Z4- 6)
文摘本文针对目前在智能交通领域受到高度关注的短程通信技术(DSRC:Dedicated Short Range Communications),提出一种用于DSRC的16单元微带天线阵列,其主要用于ETC、智能停车场等系统中的路侧单元(RSU:Road Side Unit);针对传统平面阵列天线圆极化轴比带宽窄的缺点,采用连续旋转馈电技术的方法来改善其轴比带宽,通过HFSS软件对设计方案进行电磁仿真,得到预期的结果。最后对样品测试发现其相对于传统阵列,轴比带宽提高了3倍以上。
文摘A practical antenna has been designed and developed for INMARSAT mobile satellite communications. The design uses low cost materials such as foam and copper foil to create a stacked microstrip antenna array. Several techniques were adopted to enhance the impedance bandwidth and axial ratio bandwidth. The final design parameters were optimized by EM simulation. Finally, the L-strip fed six-element stacked microstrip antenna array was constructed and tested. Simulated and measured results show that in the whole INMARSAT work band, the VSWR of the antenna is less than 1.6, its antenna gain is higher than 15dB and wide-angle axial ratio (AR) 3dB is more than 21o. The antenna has been successfully used with a HNS 9201 terminal.
