Variable capacitance coupling antenna
First Claim
1. A coupling antenna, connected to an electromagnetic wave transceiver device containing one or several built-in capacitors, said coupling antenna comprising at least one screen printed turn on a support consisting of an insulating dielectric substrate;
- wherein said antenna also includes a capacitor having a first plate, an insulating layer and a second plate which are screen printed on said support, one end of said antenna being coupled to said first plate of said capacitor and the other end of said antenna being coupled to said second plate so that said capacitor is connected in parallel to said antenna, thus reducing the capacitance supplied by the built-in capacitor(s) in said device, so that the resulting capacitance forms a resonating circuit with said turn.
1 Assignment
0 Petitions
Accused Products
Abstract
The invention thus concerns a coupling antenna connected to an electromagnetic wave transceiver device containing one or several integrated capacitors. This coupling antenna includes at least one screen printed turn (24) on a support (28) consisting of an insulating dielectric support and also includes a screen printed capacitor on the support, connected in parallel, thereby reducing the capacitance supplied by the capacitor(s) built into the device, so that the resulting capacitance forms a resonating circuit with the turn. The invention also concerns the fabrication process of such an antenna and the use of this antenna in a contactless or hybrid contact-contactless smart card.
-
Citations
11 Claims
-
1. A coupling antenna, connected to an electromagnetic wave transceiver device containing one or several built-in capacitors, said coupling antenna comprising at least one screen printed turn on a support consisting of an insulating dielectric substrate;
wherein said antenna also includes a capacitor having a first plate, an insulating layer and a second plate which are screen printed on said support, one end of said antenna being coupled to said first plate of said capacitor and the other end of said antenna being coupled to said second plate so that said capacitor is connected in parallel to said antenna, thus reducing the capacitance supplied by the built-in capacitor(s) in said device, so that the resulting capacitance forms a resonating circuit with said turn. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
11. A coupling antenna fabrication process comprising:
-
screen printing at least one antenna turn, the lower plate of a capacitor, antenna bonding pads of said antenna to one of a chip or a module, and a connection of the antenna to said lower plate of the capacitor, by depositing conductive ink onto a support, performing a second screen printing of an insulating strip of said capacitor, by depositing dielectric ink upon the lower plate of the capacitor, performing a third screen printing of the upper plate of said capacitor superimposed on said insulating strip, and the connection of the antenna to said upper plate of said capacitor.
-
Specification