Beam Steering Using Active Superstrate Antenna for WLAN Applications

This paper presents an active FSS superstrate antenna operating at 5.25 GHz for beam steering applications. The superstrate antenna consists of metallic patches on its one side and metallic grids on its other side. The variation in the reflection phase is created by gradating the mesh grid array, which results in the phase delay of the radiated fields. The tilted radiation beam is produced due to the phase delay of the radiated fields. The proposed structure also helps in making the antenna more directive which enhances the gain while maintaining the cavity height of λ/4.