发明名称 |
Systems and methods to selectively connect antennas to receive and backscatter radio frequency signals |
摘要 |
Systems and methods to selectively attach and control antennas via diodes and current sources. In one embodiment, a system includes: an RFID reader having a plurality of reader antennas of different polarizations to transmit radio frequency signals; and at least one RFID tag. The RFID tag includes: a plurality of tag antennas of different polarizations; a plurality of diodes coupled to the plurality of tag antennas respectively; a receiver coupled to the plurality of diodes to receive the radio frequency signals from the tag antennas when the diodes are forward biased; and a set of one or more current controllers coupled to the plurality of diodes. In a receiving mode the controllers selectively forward bias the diodes to receive the signals from the RFID reader. In a transmitting mode the controllers selectively change the state of the tag antennas to transmit data via backscattering the radio frequency signals.
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申请公布号 |
US8115637(B2) |
申请公布日期 |
2012.02.14 |
申请号 |
US20080132594 |
申请日期 |
2008.06.03 |
申请人 |
TUTTLE JOHN R.;MICRON TECHNOLOGY, INC. |
发明人 |
TUTTLE JOHN R. |
分类号 |
G08B13/14 |
主分类号 |
G08B13/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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