Device for wireless transfer of information
First Claim
1. A device for wireless transfer of information, comprising a data carrier in the form of a thin card transponder, that receives a first microwave signal, modulates it and codes it with data, and reradiates a second microwave signal without adding new energy thereto, including at least one antenna device formed using microstrip conductors, the antenna device comprising a patch antenna with an antenna layer (15, 28, 37) that acts against a ground plane (16, 29, 38) where the antenna layer and the ground plane are of substantially equal size, characterized in that, the device is equipped with a separate card holder (20) with a reflective surface (21) that is larger than said ground plane, said reflective surface increasing the range by reradiating the second microwave signal and reducing sensitivity to back lobe reflections.
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0 Petitions
Accused Products
Abstract
A device for wireless transfer of information includes a data carrier in the form of a thin card, and a transponder that receives a first microwave signal, modulates it and codes it with data, and reradiates a second microwave signal without adding new energy thereto. The transponder includes at least one antenna device formed using microstrip conductors. The antenna device includes a patch antenna with an antenna layer that acts against a ground plane where the antenna layer and the ground plane are of substantially equal size. The device is characterized in that, it is equipped with a separate card holder with a reflective surface that is larger than said ground plane. The reflective surface increases the range by reradiating the second microwave signal and reducing sensitivity to back lobe reflections.
75 Citations
20 Claims
- 1. A device for wireless transfer of information, comprising a data carrier in the form of a thin card transponder, that receives a first microwave signal, modulates it and codes it with data, and reradiates a second microwave signal without adding new energy thereto, including at least one antenna device formed using microstrip conductors, the antenna device comprising a patch antenna with an antenna layer (15, 28, 37) that acts against a ground plane (16, 29, 38) where the antenna layer and the ground plane are of substantially equal size, characterized in that, the device is equipped with a separate card holder (20) with a reflective surface (21) that is larger than said ground plane, said reflective surface increasing the range by reradiating the second microwave signal and reducing sensitivity to back lobe reflections.
- 12. A device for wireless transfer of information, comprising a data carrier in the form of a thin card transponder, that receives a first microwave signal, modulates it and codes it with data, and reradiates a second microwave signal without adding new energy thereto, including at least one antenna device formed using microstrip conductors, the antenna device comprises a patch antenna with an antenna layer (15, 28, 37) that acts against a ground plane (16, 29, 38) where the antenna layer and the ground plane are of substantially equal size, characterized in that, the device is equipped with a metallic foil (56) on the ground plane side, that is separate from the ground plane (38) and the metallic foil being larger than said ground plane, said metallic foil increasing the range by reradiating the second microwave signal and reducing sensitivity to back lobe reflections.
Specification