Capacitive antenna and method for making same
First Claim
1. A coupling antenna comprising at least one loop present on a support, and connected to a capacitor present on this same support, the capacitor being mounted in parallel on both contact zones of the antenna, characterized in that the antenna and the capacitor are printed by gravure printing on the same support.
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Accused Products
Abstract
The invention concerns a method for making a capacitive antenna (4) by performing a gravure process on the antenna comprising a single turn (9) connected to a capacitor (10), the turn and the capacitor being printed by a gravure process with a conductive ink. The use of a dielectric ink for the gravure process also enables a dielectric thickness (16) to be obtained between two conductive electrodes (14, 17) printed by gravure process. The capacitance of the capacitor is determined on the basis of the antenna inductance, the frequency of communication and the law of resonance whereto a chip (3) connected to said antenna (4) is subjected.
19 Citations
10 Claims
- 1. A coupling antenna comprising at least one loop present on a support, and connected to a capacitor present on this same support, the capacitor being mounted in parallel on both contact zones of the antenna, characterized in that the antenna and the capacitor are printed by gravure printing on the same support.
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6. A production process for an antenna comprising at least one loop connected to a capacitor, the antenna and the capacitor being present on the same insulating support, characterized in that it comprises the following steps:
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creating a first gravure printing of a conductive ink in order to obtain an open loop of the antenna, a lower electrode of the capacitor, and a connection between a first contact zone of the antenna and the lower electrode, creating a second printing by gravure printing with a dielectric ink to cover the lower electrode with an insulating film, creating a third printing by gravure printing with a conductive ink to obtain an upper electrode for the capacitor covering the insulating film, and to obtain a connection between a second contact zone of the antenna and the upper electrode. - View Dependent Claims (7, 8, 9, 10)
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Specification