A concave tapered slot antenna. The antenna includes a first antenna
element, a second antenna element and a concave dielectric lens. The
first and second antenna elements are situated in a tapered slot antenna
configuration. The concave dielectric lens is situated between said first
and second antenna elements so that a 3 dB beamwidth for selected
frequencies is increased. A method for fabricating concave tapered slot
antennas is also described.