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Variable capacitance coupling antenna

  • US 6,522,308 B1
  • Filed: 08/24/2001
  • Issued: 02/18/2003
  • Est. Priority Date: 01/03/2000
  • Status: Expired due to Term
First Claim
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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.

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