Electromagnetic Band Gap based compact UWB Antenna with Dual Band Notch Response

Abstract

In Antenna Technology, Electromagnetic Band Gap (EBG) structures are one of the mostly used structures to improve gain of antenna, suppress surface waves and band notching. In UWB frequency spectrum more number of small frequency bands are exists and these bands cause electromagnetic interference, to reject such bands more number of EBG structures are required. Due to limited monopole antenna's ground plane, it is required to have EBG with small in size and single EBG to reject two or more bands. The simulated results of proposed new C-shaped EBG by placing near the feedline of fork-shape Ultra-Wide Band (UWB) antenna to reject two bands namely Lower Wireless Local Area Network(L-WLAN) band range from 5.15 GHz to 5.35GHz and X-band of satellite downlink communications networks (7.25GHz –7.75GHz) within a UWB antenna's spectrum and EBG occupying less area compared with the reported Conventional Mushroom Type (CMT) EBG, semi-circular EBG, slotted-patch ELV EBG and TVS EBG. Fabrication and measurement results of the newly proposed antenna attain an enormous bandwidth i.e., from 2.8 GHz to 11.5 GHz while eliminating frequency bands between 5.15 GHz to 5.35 GHz (Lower WLAN) & 7.25GHz to 7.75GHz (X-band of satellite downlink).