ADAPTATION OF AN ANTENNA CIRCUIT FOR A NEAR-FIELD COMMUNICATION TERMINAL

• US 20130328736A1
• Filed: 06/10/2013
• Published: 12/12/2013
• Est. Priority Date: 06/11/2012
• Status: Active Grant

• Current Assignee: Melexis Technologies SA, Stmicroelectronics Rousset SAS (STMicroelectronics NV)
• Original Assignee: Melexis Technologies NV (Sensinnovat BVBA), Stmicroelectronics Rousset SAS (STMicroelectronics NV)
• Inventors: Meziache, Thierry, Zhuk, Oleksandor
• Granted Patent: US 10,249,946 B2
• Time in Patent Office: Days
• US Class Current: 343/749
• CPC Class Codes: H01Q 1/50 Structural association of antennas with earthing switches, lead-in devices or lightning protectors
• CPC Class Codes: H03H 11/48 simulating reactances
• CPC Class Codes: H03H 11/483 Simulating capacitance multipliers
• CPC Class Codes: H03H 7/40 Automatic matching of load impedance to source impedance
• CPC Class Codes: H04B 5/72 for local intradevice communication

Abstract

A method for adapting an antenna circuit including at least one first capacitive element and an inductive element in series, and at least one second capacitive element having a first electrode connected between the first capacitive element and the inductive element, wherein data representative of the voltage of said first electrode are applied to the second electrode of the second capacitive element.

Claims

1. A method for adapting an antenna circuit comprising at least one first capacitive element and an inductive element in series, and at least one second capacitive element having a first electrode connected between the first capacitive element and the inductive element, wherein data representative of the voltage of said first electrode are applied to the second electrode of said second capacitive element.

2. The method of claim 1, wherein an image of the signal present on said first electrode is applied to said second electrode.

3. The method of claim 1, wherein said data are in phase with the signal present on the first electrode.

4. The method of claim 1, wherein said data are a voltage proportional to the voltage present on the first electrode.

5. The method of claim 1, adapted to an antenna circuit comprising two first capacitive elements and two second capacitive elements, the first two capacitive elements being in series with the inductive element and each second capacitive element having a first electrode connected between the inductive element and one of the first capacitive elements, wherein data representative of the voltage of each first electrode being applied to second respective electrodes of the second capacitive elements.

6. An antenna circuit for an electromagnetic field generation terminal capable of implementing the method of claim 1.

7. The circuit of claim 6, comprising a resistive dividing bridge between said or each first electrode and the ground.

8. The circuit of claim 7, wherein the midpoint of said resistive dividing bridge is connected, via an amplifier, to said or each second electrode.

9. The circuit of claim 8, wherein the midpoint of the resistive dividing bridge is applied to a first terminal of an XOR-type logic gate having a second terminal receiving data representative of the signal applied to the antenna circuit and having its output providing data relative to the phase shift between the two electrodes of the first capacitive element.

10. The circuit of claim 9, wherein said data relative to the phase shift are converted into a voltage applied to said or each second electrode.

11. An electromagnetic field generation terminal comprising the antenna circuit of claim 6.

12. The method of claim 1, further comprising using a settable gain amplifier having a gain reference value that depends on a phase shift to supply a signal to the second electrode of the second capacitive element.