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Dual frequency vertical antenna

  • US 5,604,506 A
  • Filed: 12/13/1994
  • Issued: 02/18/1997
  • Est. Priority Date: 12/13/1994
  • Status: Expired due to Fees
First Claim
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1. A dual frequency vertical antenna for radiating a first and a second airwave signal in response to a first and a second conducted signal, respectively, said first airwave signal having a first frequency and said second airwave signal having a second frequency lower than said first frequency, comprising:

  • an electrically conductive base member;

    a mast projecting upwardly from the base member to a masthead for forming a dipole for radiating said second airwave signal, the mast including an electrically conductive rod dielectrically coupled to the mast;

    radiating means coupled said masthead for radiating said first airwave signal; and

    feeding means for feeding said first and said second conducted signal between the base member and said rod including a tuning sleeve electrically connected to the base member, coaxially disposed about the mast, and projecting upwardly from the base member for an electrical length of approximately 1/4 wavelength at said first frequency;

    a lower mast extension extending from the mast and projecting downwardly from the base member to a foot for an electrical length of approximately 1/4 wavelength at said first frequency;

    a lower rod extension coaxially disposed within the lower mast extension and electrically connected to the lower mast extension at said foot; and

    a coaxial cable to feed said first conducted signal and said second conducted signal, having an outer conductor electrically connected to the base member adjacent to the mast and having an inner conductor electrically connected to said rod adjacent to the base member.

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