Tagstar Systems Gmbh

Identive Systems Gmbh

Michael Kober

Stefan Mieslinger

Norbert Wilhelm Menke

Described are antenna assemblies and methods for forming antenna assemblies. An antenna assembly includes a dual polarized far-field antenna and a near-field loop antenna. The near-field loop antenna is electromagnetically coupled to the dual polarized far-field antenna. The near-field loop antenna includes two contacts for electrically connecting to a chip.

Dual polarized UHF antenna

An apparatus for screening the magnetic field of a transponder is described, which apparatus comprises, in a first area section, at least one flat antenna structure which comprises conductor tracks for conducting current in a direction of current flow and has an application-specific extent, wherein the apparatus comprises a second area section or carrier to which strips of a highly permeable screening material are applied such that they are oriented with respect to one another in a predetermined manner, wherein the second area section is arranged parallel to the first area section. In order to effectively screen the magnetic field which is beamed in from the outside, for instance by a reader, and in order to effectively screen the magnetic field which is generated by the antenna structure of the transponder itself following excitation, and in order to reduce eddy current losses in a metal area arranged underneath, the highly permeable screening material has either anisotropic permeability, wherein increased permeability is provided in the direction of current flow, in particular in the direction of the conductor tracks of important sections of the antenna structure, or else provides for the strips to be oriented parallel to one another in important sections, wherein the longitudinal edges of the strips are provided in the direction of current flow, in particular in the direction of the conductor tracks of important sections of the antenna structure.

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Bruckmuehl, Germany

Michael Kober