COMPACT BUTLER MATRIX, PLANAR BIDIMENSIONAL BEAM FORMER AND FLAT ANTENNA COMPRISING SUCH A BUTLER MATRIX

摘要

The compact Butler matrix consists of a planar multilayer structure comprising N waveguides with parallel metal plates PPW stacked one above the other, two adjacent waveguides PPW having a common wall formed by one metal plates. The couplers, phase shifters and crossover devices of the Butler matrix are constituted by metasurfaces integrated into the metal plates. The planar two-dimensional beamformer may comprise a PPW waveguide Butler matrix associated with optical lenses integrated in each PPW waveguide. Alternatively, the planar two-dimensional beamformer may comprise an upper stage consisting of a Butler matrix with PPW waveguides, and a lower stage comprising PPW waveguides equipped with integrated reflectors, the two stages being connected in series. .