New generations of radio telescopes: antenna concepts and technologies

Future research needs of astronomy have led radio astronomers to study the concept of a next generation of radio telescopes for what has been dubbed the Square Kilometre Array (SKA). Planned for operation in the early part of the next decade it will outperform today's radio telescope instruments in many aspects. In particular a three-decade frequency range, greatly improved sensitivity and angular resolution that matches the capabilities of planned instruments in other frequency domains, are challenges that are now being investigated. In parallel, several other new radio telescope projects are taking shape aimed to be ready at shorter timescales and which could serve as guides for the SKA. This presentation aims at an update of these activities, the concepts and the technologies that are being examined around the globe.