Generation of Dual Asymmetric Non-diffracting Beams Based on Transmission Metasurface in Microwave-frequency Region

In this paper, a method to generate dual asymmetric non-diffracting beams by a transmission metasurface is introduced. A metasurface is regularly divided into two independent complementary sub-arrays. Two sub-arrays are used to generate non-diffracting beams that propagate in different directions in a shared-aperture manner. The metasurface is made up of thousands of units. The unit modulates the transmission phase shift by its own rotation and consists of two same metallic layers and a medium layer in the middle. The transmission phase shift of the unit can cover 360°. According to this design method, two non-diffracting beams with asymmetric inclination angles are emitted by a metasurface.