Bifunctional Transmissive-Reflective Meta-atoms Employing R-T Elements

Bifunctional transmissive-reflective metasurfaces are constructed using the receiver-transmitter antenna element in this paper. Independent controls of transmission and reflection phases are achieved by using phase delay line and square split ring respectively. Then, via a combination of different polarized receiver and transmitter elements, two transmissive-reflective meta-atoms are designed. For one meta-atom, a transmissive pencil beam and a reflective vortex beam with linear polarizations have been realized. For another meta-atom, a transmissive vortex beam with right-handed circular polarization and a reflective pencil beam with linear polarization have been realized.