Systems and methods to selectively connect antennas to receive and backscatter radio frequency signals
First Claim
1. A device, comprising:
- an antenna to receive radio frequency signals;
a receiver;
a diode coupled between the antenna and the receiver; and
a circuit coupled to the diode, whereinwhen in a receiving mode, the circuit is controlled toforward bias the diode to cause the diode to provide a path for the radio frequency signals received by the antenna to reach the receiver, andreverse bias the diode to cause the diode to prevent the radio frequency signals received by the antenna from reaching the receiver, andwhen in a transmission mode, the circuit is controlled to transmit data by modulating backscatter of the antenna.
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Accused Products
Abstract
Systems and methods to selectively attach and control antennas via diodes. In one embodiment, a system includes: a reader having a plurality of reader antennas of different polarizations to transmit radio frequency signals; and at least one radio frequency device. The radio frequency device 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 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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Citations
14 Claims
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1. A device, comprising:
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an antenna to receive radio frequency signals; a receiver; a diode coupled between the antenna and the receiver; and a circuit coupled to the diode, wherein when in a receiving mode, the circuit is controlled to forward bias the diode to cause the diode to provide a path for the radio frequency signals received by the antenna to reach the receiver, and reverse bias the diode to cause the diode to prevent the radio frequency signals received by the antenna from reaching the receiver, and when in a transmission mode, the circuit is controlled to transmit data by modulating backscatter of the antenna. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device, comprising:
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a receiver; a plurality of antennas; a plurality of diodes coupled between the receiver and the plurality of antennas respectively; a current source circuit coupled to the plurality of diodes; and at least one controller coupled to the current source circuit, the at least controller configured to control the current source circuit to; when in a receiving mode, forward bias one or more first diodes of the diodes to allow radio frequency signals received via respective one or more first antennas of the antennas to reach the receiver, and reverse bias one or more second diodes of the diodes to prevent radio frequency signals from propagating from one or more second antennas of the antennas to the receiver, and when in a transmission mode, modulating grounding of one or more of the antennas to transmit data via backscattering. - View Dependent Claims (11, 12, 13, 14)
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Specification