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Multifrequency antenna for instrument with small volume

  • US 6,642,895 B2
  • Filed: 09/09/2002
  • Issued: 11/04/2003
  • Est. Priority Date: 03/15/2000
  • Status: Expired due to Fees
First Claim
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1. Antenna of elongated shape for an instrument of small volume, in particular a telephone-watch, capable of receiving and transmitting radiobroadcast message at at least two frequencies of high and low values, this antenna being formed, from a supply point of a first radiating element the length of which is tuned to the high frequency and at least a second radiating element, following the first, the length of this second element added to that of the first having a total length tuned to the low frequency, the first and second radiating elements being connected to each other by a resonant circuit whose resonance frequency is chosen to limit the length of the antenna to its first element when the high frequency is active and to use the total length of the antenna when the low frequency is active,wherein the first and second radiating elements each have a conductive strip of substantially rectangular shape and wherein the resonant circuit includes the combination of an inductor and a capacitor, said inductor being a substantially rectilinear narrow band integrally formed with at least one of said strips and connected to said strip by one of its ends.

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