▎ 摘　　要

A switchable reflectarray antenna composed of crossed metal dipoles mounted on a graphene grid is proposed for switchable radiation patterns at 1 THz. For an individual radiating element, the single graphene square loop works together with the metal dipoles to offer a corresponding phase response. As an entirety, the grid formed by the attached graphene loops is connected to a particular bias electrode for switchable operation. Taking the practical manufacturing technique into account, the graphene-oxide-silicon structure is used as the bias electrode. The simulated phase response shows that a phase range over 330 degrees is obtained by changing the dimension of the metal dipoles from 11 mu m to 70 mu m. The simulated field distributions and radiation patterns demonstrate that the proposed structure can deflect the normal incident plane waves in the predesigned direction when it is biased in a specific state. Once the bias is set to zero, incident plane waves are scattered into different directions. (C) 2020 Author(s).