A Single Feed Multi-Beam Folded Reflectarray Antenna Based on Metasurface

In this paper, a multi-beam folded reflectarray (FRA) antenna is proposed. Based on the phase compensation theory and superposition principle of complex reflection coefficients, a reflection metasurface and a polarizer grid are designed to control the phase and polarization state of the reflective wave. Then, the desired antenna radiation pattern, such as the beam direction and beam numbers, can be achieved arbitrarily with properly arrangement of the units of the metasurface. Finally, the FRA antennas with different beam states are simulated, the results show that the antenna obtains a multi-beam state at Ku band owing to the specific arrangement of the units. Moreover, the proposed antenna has a small feed blockage, simple feed and compact structure, which makes it a good candidate for the antenna in wireless communication systems.