基于超材料角反射面的高增益高效率双圆极化Fabry-Perot天线设计

基于射线跟踪模型,提出了一种超材料角反射面结构,实现了Fabry-Perot天线增益和口径效率的提升.首先对基于超材料角反射面的Fabry-Perot天线进行了理论推导和分析.然后,设计并分析了双圆极化馈源、基于超材料角反射面的Fabry-Perot天线及其性能.最后,对所提出的Fabry-Perot天线模型进行了制造和测试.结果表明,该天线的左圆极化增益和右圆极化增益分别为21.4 d Bi和21.3 d Bi.相比馈源天线,增益分别提高了16.4 d B和16.3 d B.与传统Fabry-Perot天线相比,所提出超材料角反射面同时充当了反射面和相位校正面,实现了对Fabry-Perot天线边缘电磁波的有效调控.所设计Fabry-Perot天线工作在2.8 GHz频段,具有高增益、高口径效率和低旁瓣的优点,满足了太阳射电望远镜F107指数观测的需求.

Dual circularly polarized Fabry-Perot antenna with metamaterial-based corner reflector for high gain and high aperture efficiency

Based on the ray-tracing model,a new method of achieving a high gain and high aperture efficiency Fabry-Perot antenna with metamaterial-based corner reflector is proposed.The proposed Fabry-Perot antenna is composed of a dual circularly polarized patch antenna feed and the metamaterial-based corner reflector.The metamaterial-based corner reflector consists of four phase correction metasurfaces and a partially reflective surface.First,theory and analysis of the Fabry-Perot antenna with metamaterial-based corner reflector are presented.Then,the performances of the dual circularly polarized antenna feed,the traditional Fabry-Perot antenna,and the Fabry-Perot antenna with metamaterial-based corner reflector are compared among each other and analyzed.Finally,the proposed Fabry-Perot antenna is fabricated and measured.The measured left-hand circular polarization(LHCP)gain and the measured right-hand circular polarization(RHCP)gain of the proposed Fabry-Perot antenna are 21.4 dBi and 21.3 dBi,respectively.Comparing with the antenna feed,the LHCP gain and RHCP gain of the proposed Fabry-Perot antenna are enhanced by 16.4 dB and 16.3 dB,respectively.Compared with the traditional Fabry-Perot antenna,the metamaterial-based corner reflector acts as both a reflection surface and a phase correction surface.It manipulates the propagation direction and phase of electromagnetic wave.The proposed Fabry-Perot antenna with high gain,high aperture efficiency and low sidelobe at 2.8 GHz paves the way for developing the solar radio telescope and conducting the observation.