title: Multi-band circular polarizer using planar spiral metamaterial structure.
abstract: A multi-band circular polarizer is proposed by using multi layered planar spiral metamaterial structure in analogy with classic spiral antenna. At three distinct resonant frequencies, the incident linearly polarized wave with electric field paralleling to one specific direction is transformed into left/right-handed circularly polarized waves through electric field coupling. Measured and simulated results show that right-handed circularly polarized wave is produced at 13.33 GHz and 16.75 GHz while left-handed circularly polarized wave is obtained at 15.56 GHz. The surface current distributions are studied to investigate the transformation behavior for both circular polarizations. The relationship between the resonant positions and the structure parameters is discussed as well.
authors: State Key Laboratory of Optical Technologies on Nano-Fabrication and Micro-Engineering, Institute of Optics and Electronics, Chinese Academy of Science, P.O.box 350, Chengdu 610209, China.
authors: Xiaoliang
authors: X
authors: Ma
authors: Cheng
authors: C
authors: Huang
authors: Mingbo
authors: M
authors: Pu
authors: Chenggang
authors: C
authors: Hu
authors: Qin
authors: Q
authors: Feng
authors: Xiangang
authors: X
authors: Luo