Transponder

Details Transponder Transponder

1990-05-18

1992-10-06

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

340572, H04B 700

Patent

active

051535831

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of Invention
The present invention relates to electronic and inductive communication apparatus'. Specifically, the present invention relates to a transponder, more particularly, a passive transponder. The passive transponder may be inductively powered and may store information or perform electronic functions when it is so powered. The transponder of the present invention relates to a portable, integrated and relatively cheap apparatus advantageously adapted for interrogation and/or identification of an article with which the transponder is associated. The transponder of the present invention advantageously utilises a single coil transmission and reception system. Furthermore, the unique circuit arrangement(s) of the present invention provides a single component rectifying means. The present invention lends itself to integration in a single chip form. The means used to receive a power providing signal may also be used to transmit another signal, the reception and transmission occurring in a simultaneous manner.
2. Description of the Related Art
The Applicant is aware of U.S. Pat. No. 3,859,624, which discloses two types of transponder used within an identification tag system. One form of the transponder disclosed therein includes an inductive powering field receiving coil and a separate coplanar coded information field generator coil. The power receiving coil has associated therewith a rectifier, regulator and energy storage device. The separate information coil is used as a transmitter means to an interrogation station. Each coil operates independently of the other.
The identification tag system further includes an interrogation station comprising an inductive power field generator, for the first type of tag discussed above, and an information code receiver. The interrogation station disclosed utilises a unitary coil for both the power field generation and the coded information receiver. The interrogator means, however, operates in a sequential and cyclic fashion. A first mode comprises AC power (inductive) generation by the interrogator for a finite time. A second mode, during which no AC (inductive) power is radiated to the transponder, the interrogator operates as a receiver to receive a coded information signal for a finite time. These modes are performed continuously and sequentially. No disclosure exists of simultaneous power and data reception with data transmission.
There are a number of patents utilising the principle outlined most clearly by Vinding U.S. Pat. No. 3,299,424 but in face first detailed by Brard U.S. Pat. No. 1,744,036.
In U.S. Pat. No. 3,299,424, power is radiated from a transmitter (or interrogator) and received by a tuned circuit in the transponder. The power signal induces a current to flow in the transponder's tuned circuit. This current radiates a transmission signal from the transponder's tuned circuit which is detected at the interrogator. By varying any parameter of the tuned circuit (such as tuning or loss) the induced current's phase or magnitude can be caused to vary. Thus coded data modulating a parameter of the transponder's tuned circuit can be detected and decoded by suitable circuitry at the interrogator.
The crucial point is that the current induced in the transponder's tuned circuit, by the interrogator, generates the reply signal that carrier data back to the interrogator. The "carrier" frequency for this data signal is almost invariably the same as the interrogator's power signal. A number of disclosures rely upon the generation of sub-harmonic currents, by a suitable switch means, from the current induced in the transponder's tuned circuit, i.e. Harris U.S. Pat. No. 2,979,321 and Sellers U.S. Pat. No. 4,314,373 which cannot operate with fewer than two tuned circuits. Once again the actual current in the transponder's tuned circuit directly generates the transmission signal for carrying data.
The distinctive difference is that the carrier signal is not injected into the pickup coil. This limits the transmission signal to be t

REFERENCES:
patent: 3964024 (1976-06-01), Hutton et al.
patent: 4345253 (1982-08-01), Hoover
patent: 4630044 (1986-12-01), Polzer
patent: 4724427 (1988-02-01), Carroll

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