Transponder unit
First Claim
Patent Images
1. A method for transferring data from a transponder unit of a portable data carrier to a reading device which receives data from transponders by load modulation of a field of the reading device, comprising the steps:
- the transponder unit, in a first operating mode, generating a modulated transponder field and emitting the modulated transponder field containing the data to be transferred as a first signal which emulates load modulation of the reading device field by a transponder, wherein a ring modulator of the transponder unit suppresses a carrier frequency signal generated by an oscillator of the transponder unit in favor of a subcarrier signal modulated with the data to be transferred by supplying the carrier frequency into a first input end of the ring modulator and by supplying the subcarrier signal modulated with the data to be transferred into a second input end of the ring modulator,wherein the transponder unit in a second operating mode performs load modulation for transferring the data to the reading device, wherein in the second operating mode the field of the reading device is loaded by the transponder unit and a second signal containing the data to be transferred from the transponder unit is received through coupled modulation of the field of the reading device,and wherein the portable data carrier is a chip card.
7 Assignments
0 Petitions
Accused Products
Abstract
The invention relates to a transponder unit (1) and to a method for transmitting data between the transponder unit and a reader (100). The aim of the invention is to increase the transmission range of the transponder unit (1) to the reader (100). For this purpose, means are integrated into the transponder unit (1) for actively transmitting a signal to the reader (100). The reader (100) evaluates said signal as a modulation of its own field (110) by a transponder.
49 Citations
18 Claims
-
1. A method for transferring data from a transponder unit of a portable data carrier to a reading device which receives data from transponders by load modulation of a field of the reading device, comprising the steps:
-
the transponder unit, in a first operating mode, generating a modulated transponder field and emitting the modulated transponder field containing the data to be transferred as a first signal which emulates load modulation of the reading device field by a transponder, wherein a ring modulator of the transponder unit suppresses a carrier frequency signal generated by an oscillator of the transponder unit in favor of a subcarrier signal modulated with the data to be transferred by supplying the carrier frequency into a first input end of the ring modulator and by supplying the subcarrier signal modulated with the data to be transferred into a second input end of the ring modulator, wherein the transponder unit in a second operating mode performs load modulation for transferring the data to the reading device, wherein in the second operating mode the field of the reading device is loaded by the transponder unit and a second signal containing the data to be transferred from the transponder unit is received through coupled modulation of the field of the reading device, and wherein the portable data carrier is a chip card. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A transponder unit of a portable data carrier configured to transfer data to a reading device which receives data from transponders by load modulation of a field of the reading device, comprising:
-
a ring modulator, in a first operating mode, configured to generate and emit a modulated transponder field containing the data to be transferred as a first signal which emulates load modulation of the reading device field by a transponder, wherein the ring modulator of the transponder unit is configured to supress a carrier frequency signal generated by an oscillator in the transponder unit in favor of a subcarrier signal modulated with the data to be transferred by supplying the carrier frequency into a first input end of the ring modulator and by supplying the subcarrier signal modulated with the data to be transferred into a second input end of the ring modulator, wherein the transponder unit in a second operating mode performs load modulation for transferring the data to the reading device, wherein in the second operating mode the field of the reading device is loaded by the transponder unit and a second signal containing the data to be transferred from the transponder unit is received through coupled modulation of the field of the reading device, and wherein the portable data carrier is a chip card. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A value document, comprising a transponder unit of a portable data carrier configured to transfer data to a reading device which receives data from transponders by load modulation of a field of the reading device, comprising:
-
a ring modulator, in a first operating mode, configured to generate and emit a modulated transponder field containing the data to be transferred as a first signal which emulates load modulation of the reading device field by the transponder, wherein the ring modulator of the transponder unit is configured to supress a carrier frequency signal generated by an oscillator in the transponder unit in favor of a subcarrier signal modulated with the data to be transferred by supplying the carrier frequency into a first input end of the ring modulator and by supplying the subcarrier signal modulated with the data to be transferred into a second input end of the ring modulator, and wherein the transponder unit in a second operating mode performs load modulation for transferring the data to the reading device, wherein in the second operating mode the field of the reading device is loaded by the transponder unit and a second signal containing the data to be transferred from the transponder unit is received through coupled modulation of the field of the reading device.
-
Specification