Abstract
The number of wireless devices is growing exponentially every year; as a result, increase in data traffic is projected over the following ten years of 5G wireless networks. Smaller cells at RF frequencies are unlikely to deliver the demanded capacity increase. Also, the millimeter-wave spectrum offers wider, multi-GHz channel bandwidths, and therefore has gained significant research interest as one of the most promising solutions to address the data traffic demands of 5G. To increase the spectral efficiency, in-band full-duplex (IBFD) technology is one of the potential approaches. IBFD can be achieved by simultaneously transmitting and receiving signals using the same frequency channel. A millimeter circulator with high port isolation is one of the key components in IBFD systems. This thesis presents a method to merge two exciting technologies, the millimeter-wave and the IBFD technologies, which can potentially offer the benefits of broad instantaneous bandwidth and high isolation. A circulator with a 42 dB isolation over the operating frequency band and a fractional bandwidth of 20%. Co-simulations of the circulator and the LC matching network are performed using Ansys HFSS and Keysight ADS.