Antenna for transponder
AssigneeQ-Free ASA
InventorsAtle Saegrov, Geir Vavik
Life of this patent
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Abstract
Antenna for sending and receiving microwave radiation, e.g. for use in a transponder in a transponder system for wireless payment of tolls, or the like. It has an excited antenna element (13) placed on a dielectric antenna carrier or substratum (11), e.g. on a printed circuit board laminate with a copper covered plastic basis suitable for manufacturing of so-called printed circuits. To increase the performance of the antenna for high production rates with cheap materials, the antenna element is placed such that it gets a directional effect mainly perpendicular to a bearing plane (12) of the substratum (11).
Claims13
Antenna for sending and receiving microwave radiation, e.g. for use in a transponder in a transponder system for wireless payment of a toll or the like, having a excited antenna element (13) extending mainly as a surface, specially in a plane, the said antenna being placed on a dielectric antenna supporter or substratum (11), in such a way that it gets a directional effect mainly perpendicular to a bearing plane (12) of the substratum (11), characterized in that the excited antenna element (13) is at least mainly linearly polarized, and assigned in a predetermined distance to a antenna element (22) operating as a polarization transformer, to transform linearly polarized radiation to circular or elliptical polarized radiation, or vice versa, that the polarization transformer (22) is made to operate as a director, and that the excited antenna element (13) is shaped as a frame or loop antenna.
Dependencies are inferred from the claim text.