Triple Rectangular Notch UWB Antenna Using EBG and SRR

Abstract

This paper investigates an ultra-wideband (UWB) antenna with a triple-rectangular notch band at 5G, WLAN, and Satellite downlink bands. The 5G and WLAN bands are notched by using a pair of electromagnetic bandgap (EBG) structures while the satellite downlink band is notched by using two split-ring resonators (SRRs). The EBG structure is a metallic conductor loaded on the backside of the radiator which is connected to the patch via a shorting pin. The SRRs consist of a pair of metallic rings etched on the backside of the feedline. The simulated and measured results show that the proposed antenna has an operational bandwidth from 3.1 - 11.8 GHz for $\vert \text{S}11\vert < -10$ rejecting 5G sub-6 GHz (3.4 - 3.9 GHz), WLAN (5.15 - 5.825 GHz), and satellite downlink band (7.25 - 7.75 GHz) signals with high selectivity. The peak gain of the UWB antenna is 3.86 dBi but it sharply decreases up to -13 dBi at stop-bands. The antenna also has additional advantages of the overall compact size ( $20\times 26\times1.52$ mm3) with stable gain and radiation patterns at the pass-bands.