LEAKY WAVE ANTENNA

An antenna device (1) and an antenna stack (20) comprising at least two antenna devices are disclosed. The antenna device comprises a leaky wave antenna structure comprising a waveguide structure (2) extending in a first plane along a first axis (101), wherein the waveguide structure comprises two opposite end portions (3) along the first axis, and a first feed point and a second feed point arranged at opposite end portions of the waveguide structure. The antenna device further comprises a dispersive lens structure (6) having an edge extending along the waveguide structure in the first plane, the dispersive lens structure having an extension along a second axis (102) extending in the first plane in a second direction perpendicular to the first axis. The waveguide structure further comprises a plurality of discontinuities along an interface between the waveguide structure and the dispersive lens structure for leaking electromagnetic energy into dispersive lens structure.