Switched phase receiver for a long range RFID system
First Claim
Patent Images
1. A conversion receiver in a radio frequency identification system, the conversion receiver comprising:
- a phase shifting circuit to phase shift a received signal;
a switching circuit coupled to the phase shifting circuit to select either the received signal or the phase shifted received signal;
a single receiver chain coupled to the switching circuit configured to process either the received signal or the phase shifted received signal.
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Abstract
A conversion receiver in a radio frequency identification system includes a phase shifting circuit that shifts the phase of a received signal. A switching circuit is coupled to the phase shifting circuit and selects either the received signal, or the phase shifted signal. A single receiver chain is coupled to the switching circuit and is configured to process either the received signal or the phase shifted received signal.
52 Citations
19 Claims
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1. A conversion receiver in a radio frequency identification system, the conversion receiver comprising:
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a phase shifting circuit to phase shift a received signal;
a switching circuit coupled to the phase shifting circuit to select either the received signal or the phase shifted received signal;
a single receiver chain coupled to the switching circuit configured to process either the received signal or the phase shifted received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of transmitting data to minimize RFID backscatter modulation by a transmission antenna array, the method comprising:
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receiving a radio frequency signal;
shifting the phase of the radio frequency signal; and
processing either the received radio frequency signal or the phase shifted radio frequency signal, the processing occurring in a single receiver chain. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification