Frequency selective surface with relative zero-phase shift property

In this paper, frequency selective surface (FSS) with relative zero-phase shift is realized and characterized. The FSS unit cell is designed by adding cross aperture to the cross loop slot at its center, and the four ends are placed by Y-shaped slots. Compared with normal FSS, the FSS with the relative zero-phase shift avoid the aberrance of the main lobe direction on the radiation pattern of antenna, when the FSS is designed for the radome. Numerical simulations are carried out to validate wider bandwidth and better angle stability. It is a miracle that the epsilon-near-one(ENO) metamaterial properties are presented, so the screen of these FSSs have many properties similar to air. The near-field and far-field are almost not affected by the screen for the cylindrical wave.