共享孔径超表面设计及其在提升波导缝隙天线辐射和散射性能中的应用

根据平面阵列散射理论和天线共享孔径思想,提出了一种由完美吸波体(PMA)和人工磁导体(AMC)交错构成的共享孔径超表面(SA-MS),可在同一孔径面上同时实现对电磁波的吸收和相位对消。仿真结果表明由于吸波频段与相位对消频段的级联,该SA-MS相比理想导电体(PEC)、PMA、AMC-PEC具有宽带雷达散射截面(RCS)减缩效果。而后将该SA-MS与波导缝隙天线一体化设计并加工,仿真与实测结果表明:与金属面天线相比,SA-MS天线增益提升了3.3dB,同时RCS在5.52~7.51GHz范围内的减缩在6dB以上,减缩带宽达到30.5%,x、y极化条件下最大减缩量分别达到20.5dB和20.2dB,验证了设计的SA-MS对天线的辐射和散射性能均有提升。

A Design of Shared Aperture Metasurface and its Application on Improving Radiation and Scattering Performance at the Waveguide Slot Antenna

Based on the theory of planar array scattering and the idea of antenna shared aperture, this paper proposes a design of shared aperture metasurface (SA-MS) composed by perfect metamaterial absorber (PMA) and artificial magnetic conductor (AMC) in stagger arrangement. The SA-MS not only can achieve wave-absorbing, but also has the function of phase counteraction. The simulation results indicate that the SA-MS can achieve broadband radar cross section (RCS) reduction compared with the surface of perfect electronic conductor (PEC), PMA and PEC-AMC due to cascade connection of frequency band between PMA and AMC . Then the SA-MS and waveguide slot antenna are integrated and fabricated. The simulation and measured results show that the gain of proposed antenna increases by 3.3dB compared with the reference antenna. At the same time, the RCS of SA-MS antenna is reduced by more than 6dB at the range of 5.52-7.51GHz, and the relative bandwidth is 30.5%. The largest RCS reduction reaches 20.5dB and 20.2dB on the condition of x polarization and y polarization respectively. The SA-MS can improve both the radiation and scattering performance of the antenna.