ESA and KTH have developed a Water drop antenna
In a collaboration between ESA and KTH, engineers have developed new 'water drop' antennas, named since its shape resembles the ripples produced by a water drops falling on a fluid.
The antenna is designed to direct radio waves. Traditional waveguide lenses use complex dielectric materials to limit unwanted electromagnetic signals, but this new water drop lens directs wanted signals purely due to its curved shape. This results in a much simpler and cheaper manufacturing process and opens up for interesting opportunities.
The article can be read in its entirety here:
ESA article on the Water drop antenna lens