Abstract: A phased array antenna (10) includes a plurality of subarray lattices (16) arranged in an aperiodic array lattice (14). Each subarray lattice (16) includes a plurality of antenna elements (20) arranged in an aperiodic configuration such as formed on a multilayer circuit board (24). Electronic circuitry (26) are supported by the circuit board and mounted between the antenna elements (20) and operatively connected thereto for amplifying, phase shifting and beam forming any transmitted or received signals.

Abstract: A printed circuit board antenna is provided which includes an electronic switch (38) whereby a single compact radiating structure consisting of a split dipole antenna (10) with associated balun structure (11) may be selectively driven in either of two modes to provide orthogonal polarization and pattern diversity: as a split dipole antenna with a quarter wave balun relying on the split dipole antenna (10) as the radiating element; or as a top-loaded monopole relying on the quarter wave balun structure (11) as the radiating element against a ground plane (12). Orthogonal polarization and pattern diversity are achieved as a result of the mutually perpendicular orientations of the split dipole antenna (10) and its integral balun structure (11).