发明授权
US08160493B2 Spatially selective UHF near field microstrip coupler device and RFID systems using device 有权
空间选择性UHF近场微带耦合器器件和RFID系统使用器件

Spatially selective UHF near field microstrip coupler device and RFID systems using device
摘要:
A system having a UHF RFID transceiver is adapted to communicate exclusively with a single electro-magnetically coupled transponder located in a predetermined confined transponder operating region. The system includes a near field coupling device comprising a plurality of lines connected in parallel with an unmatched load. The near field coupling device may be formed, for example on a printed circuit board with a plurality of electrically interconnected traces and a ground plane. The system establishes, at predetermined transceiver power levels, a mutual electro-magnetic coupling which is selective exclusively for a single transponder located in a defined transponder operating region. Also included are methods for selective communication with the transponder in an apparatus such as a printer-encoder.
信息查询
0/0