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;
a bias circuit coupled to the diode, the bias circuit including a transistor coupled between the diode and ground, the bias circuit controllable to adjust a bias status of the diode; and
a controller coupled to the bias circuit, wherein the controller adjusts the bias status of the diode to;
selective allow the radio frequency signals received by the antenna to reach the receiver; and
modulate data transmitted from the device via the antennawherein the controller controls a gate of the transistor; and
the gate is configured to change impedance between the antenna and the ground according to the data to be transmitted to change backscattering 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
13 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; a bias circuit coupled to the diode, the bias circuit including a transistor coupled between the diode and ground, the bias circuit controllable to adjust a bias status of the diode; and a controller coupled to the bias circuit, wherein the controller adjusts the bias status of the diode to; selective allow the radio frequency signals received by the antenna to reach the receiver; and modulate data transmitted from the device via the antenna wherein the controller controls a gate of the transistor; and
the gate is configured to change impedance between the antenna and the ground according to the data to be transmitted to change backscattering of the antenna. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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 plurality of bias circuits coupled to the plurality of diodes respectively, each of the plurality of bias circuits including a transistor coupled between one of the diodes and ground and controllable to adjust a bias status of a respective diode of the plurality of diodes; and a circuit configured to selectively couple a control signal to a selected bias circuit in the plurality of bias circuits, wherein; the selected bias circuit is controllable to adjust a bias status of a first diode of the plurality of diodes; the first diode is coupled to a first antenna of the plurality of antennas; and the control signal is adjustable to change the bias status of the first diode in; selective allowing radio frequency signals received by an antenna coupled to a diode to reach the receiver; and modulating data transmitted from the device via the antenna; wherein a gate of the transistor is configured to change impedance between the antenna and the ground according to the data to be transmitted to change backscattering of the antenna. - View Dependent Claims (8, 9)
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10. A device, comprising:
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a plurality of antennas; a receiver; a plurality of diodes coupled between the receiver and the plurality of antennas respectively; a bias circuit shared by the plurality of diodes to adjust bias statuses of the diodes simultaneously, the bias circuit including a transistor coupled between the diode and ground; and a controller coupled to the bias circuit, wherein the controller adjusts the bias statuses of the diodes in; selective allowing radio frequency signals received by the antennas to reach the receiver; and modulating data transmitted from the device via the antennas; wherein a gate of the transistor is configured to change impedance between the antennas and the ground according to the data to be transmitted to change backscattering of the antennas. - View Dependent Claims (11, 12, 13)
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Specification