Antenna element with filtering properties

Abstract

An antenna element (1) comprising at least a first planar conductive layer (3) is described. A cutout (6) is formed in the first planar conductive layer (3), which cutout (6) defines two opposing parts (7, 7') of the conductive layer (3), wherein the opposing edges (8, 8') of the opposing parts (7, 7') follow a respective main curve (9, 9') and define a tapering shape from a first end (13), at an edge of the first planar conductive layer (3), to a second end (14). The cutout (6) comprises, in each one of the opposing sides (8, 8') a plurality of secondary cutouts (15, 15') extending from the main curves. The antenna element comprises a waveguide (19) surrounding at least a part of the length of the cutout (6). The lengths (L) of the secondary cutouts (15, 15') from the main curves (9, 9') vary in the direction of the length axis (10), with the shortest secondary cutouts (15, 15') closest to the ends of the cutout (6).

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