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Antenna system having a plurality of fundamental resonances

  • US 5,798,736 A
  • Filed: 03/28/1995
  • Issued: 08/25/1998
  • Est. Priority Date: 03/28/1995
  • Status: Expired due to Term
First Claim
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1. An antenna adapted to resonate in a plurality of frequency bands without physically reconfiguring the antenna, wherein the antenna is adapted to resonate in a lower frequency band and at least one upper frequency band, the antenna comprising:

  • an outer conductor electrically conducted to a feed network, said outer conductor having a longitudinally extending tubular portion defining an internal cavity therein; and

    a plurality of interior conductors that are each directly connected and interconnected at their respective first ends to a portion of said outer conductor, wherein said plurality of interconnected interior conductors are nested to thereby define an outermost conductor and a plurality of inner conductors, and wherein each inner conductor has a second end which extends longitudinally beyond an adjacent interior conductor which is positioned in an at least partially surrounding relationship thereto such that each inner conductor defines an extended conductor portion which extends longitudinally beyond the at least partially surrounding adjacent interior conductor;

    wherein the extended conductor portion of at least one of said interior conductors has a predetermined electrical length equal to an odd multiple of a quarter wavelength of a signal having a frequency in each upper frequency band of the antenna such that the extended conductor portion of at least one of said interior conductors is electrically decoupled from the antenna for signals having frequencies within each of the upper frequency bands.

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