The State-of-the-art Research on UWB Eleven Feed and QRFH Feed in a Perspective of SKA

Several large radio astronomy projects, such as SKA, FAST and VLBI, are under development in different phases towards their final goals. Among all future radio telescopes, ultra-wideband (UWB) antenna systems are demanded and thus draws a lot of research resources. In this talk, the state-of-the-art research at Chalmers University of Technology and Onsala Space Observatory on two most promising UWB feed technologies, the Eleven feed and quadruple-ridge flared horn (QRFH) feed, will be reviewed with theory of their working principles, new techniques applied for improving the performance, optimization technologies, mechanical designs for assurance of realization of all technique implementation, and system performance optimization and evaluations. The developments have been driven in a perspective of SKA Mid band array. Examples and future developments will be discussed in the talk