Method for tuning an antenna resonant circuit of a passive transponder
First Claim
1. Method for tuning an antenna resonant circuit of a passive transponder, the operating energy of which is capacitively drawn from a high-frequency electromagnetic carrier field, and which has a semiconductor body with an integrated circuit (IS) with a signal part (ST) with reference potential connection, which has an antenna arrangement arranged on a substrate, the antenna arrangement is linked to the integrated circuit (IS) via a contact surface (BP) connected on the semiconductor body, in which the antenna (AN) forms a serial resonant circuit with the input capacitor of the integrated circuit (IS), wherein the parasitic, capacitive and resistive parts, which form a current path between the contact surface (BP) and the reference potential, are reduced in order to raise the quality of the antenna resonant circuit.
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Abstract
In the previously known methods for tuning the antenna resonant circuit, in the case of passive transponders, their range in a high-frequency carrier field is generally limited to a few cm as the supply voltage for the integrated circuit gained from the carrier field falls very quickly with increasing distance.
According to the new method, the range of passive transponders in a high-frequency electromagnetic carrier field is substantially increased, in that the real and imaginary parts connected to the contact surface of the antenna contact are minimized and the energy absorbed from the carrier field by means of a serial resonant circuit is used to the greatest possible extent for generating the supply voltage for the integrated circuit of the transponder.
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Citations
7 Claims
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1. Method for tuning an antenna resonant circuit of a passive transponder, the operating energy of which is capacitively drawn from a high-frequency electromagnetic carrier field, and
which has a semiconductor body with an integrated circuit (IS) with a signal part (ST) with reference potential connection, which has an antenna arrangement arranged on a substrate, the antenna arrangement is linked to the integrated circuit (IS) via a contact surface (BP) connected on the semiconductor body, in which the antenna (AN) forms a serial resonant circuit with the input capacitor of the integrated circuit (IS), wherein the parasitic, capacitive and resistive parts, which form a current path between the contact surface (BP) and the reference potential, are reduced in order to raise the quality of the antenna resonant circuit.
Specification