Hash Unit Cell Shape Used To Enhancement Gain and Bandwidth of Metasurface Antenna

Abstract

In this paper, Low-profile, high gain and wideband antenna loaded with a single layer metasurface are proposed. The process of adding the metasurface layer depends on the Fabry Pérot technology, which required existing an air gap among the slot antenna and the metasurface layer. The metasurface layer consists of an array of 4 × 4 unit elements placed on a Roger Ro4003C substrate layer with a thickness of 2.5mm. Hash shape is used as a radiating element. The metasurface MS is acting as left-hand material in which both permittivity and permeability are negative, leading to negative refractive indexing. The emitted waves from the slot antenna are affected by a set of unit cells on the metasurface MS above the slot antenna because of the structure’s equivalent relative permeability and permittivity changes, and the slot antenna performance changes accordingly. The antenna works at a frequency of 6.75 GHz as a resonant frequency with an improvement in the bandwidth value for the metasurface antenna to get a value of 2.2 GHz instead of 390 MHz for the slot antenna. The proposed antenna has a 37 % bandwidth impedance starting at 4.7 GHz and ending at 6.9 GHz with a 7.43 dB gain value. The suggested antenna is useful for use with Wi-Fi applications.