Design of a simple and efficient ultra-wideband dipole-structured cross-polarization conversion metasurface

Abstract

Electromagnetic applications frequently necessitate precise polarization control, such as converting horizontal polarization to vertical. This work introduces an innovative reflection mode metasurface that rotates the state of linearly polarized electromagnetic waves in the microwave spectrum. The envisioned unit cell has three layers that make up its symmetry: a reflective copper surface at the bottom, a 3 mm thick F4BM substrate in the center, and a copper patch having tiny strips on both sides and a 45° angled dipole structure on top. With a fractional bandwidth of 98%, this unit cell can rotate components of linear polarized signals by 90° in the ultra-wideband frequency range (8.6∼25.3 GHz). In the required frequency spectrum, the surface has excellent polarization conversion ability, which is calculated as the polarization conversion ratio (PCR), which is nearly equal to 95%. The surface also shows stability to oblique angle incidence in the wide band. The suggested metasurface has significant uses in antenna design, wireless communication, and stealth technology.