Tunable antenna circuit, particularly for contactless integrated circuit reader
First Claim
1. An antenna circuit tunable to a determined resonance frequency, comprising an antenna coil and adjustable components, the antenna circuit comprising a filter that is an integral part of the antenna circuit and that has at least one voltage tap point to tap an electric voltage the amplitude of which forms a pertinent indication for tuning the antenna circuit.
5 Assignments
0 Petitions
Accused Products
Abstract
An antenna circuit tunable to a determined resonance frequency, includes an antenna coil and adjustable components. The antenna circuit includes a filter having at least one point to tap an electric voltage the amplitude of which forms a pertinent indication for the tuning of the antenna circuit. To tune the antenna circuit, the adjustable components of the antenna circuit are adjusted so that the electric voltage has a determined amplitude.
40 Citations
36 Claims
- 1. An antenna circuit tunable to a determined resonance frequency, comprising an antenna coil and adjustable components, the antenna circuit comprising a filter that is an integral part of the antenna circuit and that has at least one voltage tap point to tap an electric voltage the amplitude of which forms a pertinent indication for tuning the antenna circuit.
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22. A method for tuning to a determined resonance frequency an antenna circuit having an antenna coil and adjustable components, the method comprising:
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incorporating a filter into the antenna circuit so that the filter is an integral part of the antenna circuit;
applying an excitation signal to the antenna circuit;
tapping at least a first electric voltage at a terminal of the filter; and
adjusting the adjustable components of the antenna circuit so that the first electric voltage has a determined amplitude. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification