Design and measurement of a differential fed tapered slot UWB antenna

A compact tapered slot antenna fed by differential microstrip lines for ultra wideband has been proposed. The antenna is composed by an elliptical tapered slot ended by a triangular open stub. A differential pair of two microstrip lines of 50Ω is used to feed the antenna, which makes it convenient to connect with differential RF front end circuits. To check the performance of the differential antenna, an ultra-wideband B AL UN has been implemented to transit from 100Ω differential pair to 50Ω microstrip line. Both S parameters and radiation patterns of the antenna are measured with the BALUN connected, and the results show that the antenna is suitable for compact differential circuits and systems.