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US 6,650,695 B1Granted
Wireless digital data transmission from a passive transceiver
AssigneeIntel Corporation
InventorLuke B. Girard
Life of this patent
Estimating the term…
Abstract
A wireless network transmits digital data. The network includes an active transceiver to transmit carrier waves at a succession of preselected frequencies and a transponder. The transponder transmits digital data to the active transceiver by partially reflecting the carrier waves.
Claims26
A wireless network comprising:
- an active transceiver to transmit a protocol message on a modulated carrier wave and to subsequently transmit carrier waves at a succession of preselected frequencies, wherein the protocol message includes data for the preselected frequencies;
- and
- a transponder to transmit digital data to the active transceiver by partially reflecting a first carrier wave having a first of the succession of preselected frequencies and to partially reflect a second carrier wave having a second of the succession of preselected frequencies prior to receiving a new protocol message from the active transceiver.
A transceiver for digital data, comprising:
- an antenna to transmit radio-frequency (RF) carrier waves;
- and
- a RF module coupled to drive the antenna to produce the RF carrier waves and to detect reflected portions of the produced RF carrier waves, the RF carrier waves having a succession of frequencies, the RF module further coupled to drive the antenna to produce a modulated carrier wave to transmit a first protocol message, the first protocol message including data for the succession of frequencies, the RF module further coupled to produce and detect carrier waves of at least two of the succession of frequencies prior to transmission of a second protocol message.
An apparatus, comprising:
- a transponder having an RF reflectivity, the transponder to receive a first protocol message including data for a succession of predetermined RF frequencies, the transponder further to modulate the RF reflectivity in response to receiving carrier waves having at least two of the succession of predetermined RF frequencies prior to receiving a second protocol message.
A method of wireless data transmission, comprising:
- transmitting a first protocol message on a modulated radio-frequency (RF) carrier wave, the protocol message including data for a succession of frequencies for subsequent RF transmissions;
- transmitting RF carrier waves to a transponder having at least two of the succession of frequencies;
- and
- receiving reflected portions of the RF carrier waves from the transponder, the reflected portions being digitally modulated;
- transmitting a second protocol message on a modulated radio-frequency (RF) carrier wave, the protocol message including data for a second succession of frequencies for subsequent RF transmissions.
2 more elements
A method of wireless digital communication, comprising:
- receiving a protocol message at a receiver from an interrogator, the protocol message including data for a succession of frequencies for subsequent RF transmissions;
- performing a setup procedure for data transmissions in response to receiving the protocol message;
- receiving a first radio-frequency (RF) carrier wave from the interrogator;
- digitally modulating an RF reflectivity of the receiver;
- back reflecting a portion of the first RF carrier wave in response to the digitally modulating an RF reflectivity;
- and
- digitally modulating the RF reflectivity of the receiver to back reflect a second RF carrier wave having a new carrier frequency prior to receiving a new protocol message.
4 more elements
The method of claim 26, wherein the electrically opening and closing includes modulating a conductivity of a transistor which forms a serial link in the circuit.
Dependencies are inferred from the claim text.