DIRECTIONAL WAVEGUIDE COUPLER, BEAMFORMING NETWORK, AND ANTENNA ARRAY COMPRISING SAID COUPLER

摘要

A directional waveguide coupler (20), having four input ports and four output ports, wherein each of the input ports is coupled to each of the output ports, wherein the directional coupler (20) comprises:- a first coupler having two waveguides (W1, W2) coupled to each other by means of a first slot array (S1), defined in a first wall (21) common to the two waveguides (W1, W2) of the first coupler;- a second coupler having two waveguides (W3, W4), coupled to each other by means of a second slot array (S2), defined in a second wall (22) common to the two waveguides (W3, W4) of the second coupler.The first slot array (S1) and the second slot array (S2) lie on a first common plane. The first and second couplers are coupled to each other by means of a third slot array (S3) and a fourth slot array (S4), which lie on a second common plane perpendicular to the first common plane.