Abstract: The present invention relates to antennas of a planar profile coupled to waveguides, and particularly to completely planar antennas, applicable in mobile telephony, radars and space communications, which base their operating on the transmission of electromagnetic waves, mainly in the range of microwaves and millimetric waves, through a thin opening of a height that is less than the wavelength, having corrugations around said opening such that maximized wave transmission as well as the collimation thereof in a defined direction towards leaky waves by means of a resonant coupling mechanism are obtained.

Abstract: Filter for microwaves and millimetER waves, characterised in that it comprises a planar transmission medium (1) that it includes a conductor strip (3), metallic ground plane (4) and dielectric substrate (2) and in that it includes at least one split rings resonator (5a, 5b, 5c, 5d, 5e and 5f)