BROADBAND MICROSTRIP ANTENNAS

An antenna assembly comprises a first laminar structure which includes a sheet of dielectric material 1 having on one side a contiguous metal sheet 3 and on the other side a strip transmission line 2 adapted to be coupled with signal feeding means, and a second laminar structure, one side of which is in contact with the transmission line, and having on the other side, at least one region but preferably at least two concentrically arranged regions of a coated or cladded metal which serves as a radiator, characterised in that the transmission line is non-symetrically disposed with respect to the radiator.