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Dual-frequency helix antenna

  • US 6,340,954 B1
  • Filed: 07/26/1999
  • Issued: 01/22/2002
  • Est. Priority Date: 12/16/1997
  • Status: Expired due to Fees
First Claim
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1. An antenna for transmitting and receiving radio-frequency signals, comprising:

  • a cylindrical coil conductor having a first and second turn and one or more additional turns between said first and second turn;

    said first and second turn each having a pitch unequal to the pitch of the other of said first and second turn; and

    said one or more additional turns each having a pitch unequal to the pitch of the other of said additional turns; and

    said respective pitches of said one or more additional turns having values between the respective values of the pitches of said first and second turns;

    wherein said turns and pitches are arranged such that the fundamental resonant frequency of the antenna is in the operational frequency range of a first cellular radio system and a harmonic resonant frequency of the antenna is in the operational frequency range of a second cellular radio system.

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