High Gain Compact Dual Band Antenna Using Frequency Selective Surface for 5G and WLAN Applications

Abstract

In this paper, a high gain antenna using Frequency Selective Surface (FSS) is proposed. The compact structure is designed from a circular Ultra-wideband (UWB) monopole. Higher order modes of UWB antenna are suppressed by decreasing the thickness of the monopole, ground plane dimensions, and increasing the gap between the ground plane and the monopole. Symmetrical portion of circular monopole is etched to form a semicircular monopole, and an off-set feed is employed. Dual band characteristics and miniaturization are achieved by etching horizontal and vertical slots and reducing ground plane dimensions. An FSS reflector is designed for gain enhancement. This miniaturized antenna offers less blockage and therefore, higher gain improvement when an FSS is used as a reflector.