EP0768540A1
Expired / Lapsed
EP
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Transponder system and method
Assignee: Texas Instruments Deutschland GmbH
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Filing: 1996-10-09
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Granted: —
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Expires: 2016-10-09
Abstract
Abstract A transponder system (8) includes a reader (10) that interrogates transponders (12, 14, 16) operating in full or half duplex and using different protocols. The reader (10) includes a transmitter (18), an antenna (30), a receiver (36), and a controller (42). Each of the transponders (12, 14, 16) include a controller (60) and antenna circuitry (52, 54, 56, 58, 64) for receiving an exciter signal from the reader (10) and generating a modulated signal.
Inventors
- 👤 Josef H. Schuermann
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 06:20
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10009; G06K7/10297; G01; G01S; G01S13/00; G01S13/74; G01S13/75; G01S13/751; G01S13/758; G06K7/0008; G01S13/82; G01S13/825
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
105 words
A transponder system, comprising: a reader operable to transmit a selected one of a first exciter signal and a second exciter signal; a first transponder located in spaced relation to the reader, the first transponder operable to receive the first exciter signal and to transmit a first modulated signal in response to the first exciter signal; a second transponder located in spaced relation to the reader, the second transponder operable to receive the second exciter signal and to transmit a second modulated signal in response to the second exciter signal; and the reader operable to receive the first modulated signal and the second modulated signal.
Claim 2
Dependent Claim
45 words
The transponder system as claimed in Claim 1, wherein: the first exciter signal comprises a fixed frequency signal of a first duration; and the second exciter signal comprises a fixed frequency signal of a second duration, the second duration being greater than the first duration.
Claim 3
Dependent Claim
24 words
The transponder system as claimed Claim 1 or Claim 2, wherein the reader alternately transmits the first exciter signal and the second exciter signal.
Claim 4
Dependent Claim
36 words
The transponder system as claimed in any preceding claim further comprising; a third transponder operable to receive the second exciter signal and to begin transmission of a third modulated signal while receiving the second exciter signal.
Claim 5
Dependent Claim
22 words
The transponder system as claimed in any preceding claim wherein the first modulated signal and the second modulated signal are frequency modulated.
Claim 6
Dependent Claim
24 words
The transponder system as claimed in any preceding claim, wherein the reader successively transmits the first exciter signal after receiving the first modulated signal.
Claim 7
Dependent Claim
23 words
The transponder system as claimed in any preceding claim, wherein the reader transmits the second exciter signal after receiving the second modulated signal.
Claim 8
Independent Claim
61 words
A method for operating a reader to communicate with at least two transponders, comprising: transmitting a first exciter signal; receiving a first modulated signal from a first transponder if the first transponder receives the first exciter signal; transmitting a second exciter signal; and receiving a second modulated signal from a second transponder if the second transponder receives the second exciter signal.
Claim 9
Dependent Claim
50 words
The method as claimed in Claim 8, wherein the transmitting steps comprise; transmitting a first exciter signal having a fixed frequency signal of a first duration; and transmitting a second exciter signal having a fixed frequency signal of a second duration, the second duration being greater than the first duration.
Claim 10
Dependent Claim
34 words
The method as claimed in Claim 8 or Claim 9, further comprising the step of; receiving a third modulated signal transmitted by a third transponder while the third transponder receives the second exciter signal.
Claim 11
Independent Claim
22 words
The method as claimed in Claims 8 to 10, further comprising frequency modulating the first modulated signal and the second modulated signal.
Claim 12
Independent Claim
35 words
The method as claimed in Claims 8 to 11, wherein the steps of transmitting the first exciter signal and receiving the first modulated signal are repeated until a data telegram is received at the reader.
Claim 13
Independent Claim
25 words
The method as claimed in Claims 8 to 12, further comprising the step of; transmitting the first exciter signal after receiving the second modulated signal.
Claim 14
Dependent Claim
61 words
A reader, comprising: a transmitter operable to transmit a selected one of a first exciter signal and a second exciter signal; and a receiver operable to receive a first modulated signal from a first transponder responding to the first exciter signal, the receiver further operable to receive a second modulated signal from a second transponder responding to the second exciter signal.
Claim 15
Dependent Claim
38 words
The reader as claimed in Claim 14, further comprising a controller coupled to the transmitter, the controller being operable to select one of a first exciter signal and a second exciter signal to be transmitted by the transmitter.
Claim 16
Dependent Claim
48 words
The reader as claimed in Claim 14 or Claim 15 further comprising; an antenna coupled to the transmitter and the receiver, the antenna being operable to transmit the first exciter signal and the second exciter signal, and to receive the first modulated signal and the second modulated signal.
Claim 17
Dependent Claim
52 words
The reader as claimed in Claims 14 to 16, further comprising: a transmit antenna coupled to the transmitter and operable to transmit the first exciter signal and the second exciter signal; and a receive antenna coupled to the receiver and operable to receive the first modulated signal and the second modulated signal.
Claim 18
Dependent Claim
32 words
The reader as claimed in Claims 14 to 17, wherein the receiver is operable to receive a third modulated signal transmitted by a third transponder during transmission of the second exciter signal.
Claim 19
Dependent Claim
68 words
The reader as claimed in Claims 14 to 18, wherein the transmitter comprises: an oscillator operable to generate a periodic signal; an amplifier having an input coupled to the oscillator, the amplifier operable to amplify the periodic signal; an antenna coupled to an output of the amplifier; and loading circuitry coupled to the output of the amplifier, and operable to degrade the quality of the antenna when enabled.
Claim 20
Dependent Claim
29 words
The reader as claimed in Claim 19, wherein the loading circuitry is enabled during transmission of the first exciter signal and disabled during transmission of the second exciter signal.
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