Design and Analysis of Microstrip EBG Loaded Antenna for IBFD for 5G sub-6 GHz Bands

Abstract

The optimum use of the scarce resource of RF spectrum is required to meet the ever-increasing needs of wireless devices. This effective usage is required for the congested 5G sub-6-GHz bands to provide systems with reduced latency and larger data throughput. IBFD systems promise to meet such needs by boosting spectrum usage by a factor of two by sending and receiving at the same frequency at the same time. The implementation of IBFD systems is limited owing to the high-power transmitter's leakage to sensitive receivers, which causes self Interference. IBFD systems using microstrip antennas often have low impedance bandwidths. This thesis describes a 4-port microstrip based monostatic antenna system that uses polarization diversity as an interference cancellation approach with EBG loading to increase the system's bandwidth by combining two resonances. The constructed system obtained a fractional bandwidth of roughly 34.45%. and achieved a peak isolation level with an off the shelf differential network of ~ 83dB with maintained isolation of around -55dB from 3.18 to 4.1 GHz.This system also reported a measured maximum realized gain of around 8.4 dBi and maximum cross polarization level of -42 dB over the impedance bandwidth. The suggested antenna is intended for usage in sub-6 GHz 5G applications (n-77, n 78). The frequency range 3.3-4.2 GHz is being auctioned off for 5G licensing, and a portion of it has already been allotted. Improvements in enhanced mobile broadband and low latency in 5G networks. Aside from 5G applications, there are WLAN applications described in IEEE 802.11y (3.6 GHz bands), C-Band applications for cellular telephony (3.7-3.98 GHz), military radio applications with simultaneous jamming and channel monitoring, and satellite communication applications (3.7-4.2 GHz).