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Antenna for broadband wireless communications

  • US 6,373,448 B1
  • Filed: 04/13/2001
  • Issued: 04/16/2002
  • Est. Priority Date: 04/13/2001
  • Status: Expired due to Fees
First Claim
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1. A circularly polarized helical antenna comprising:

  • an elongate core formed of a substantially rigid dielectric material having a proximal end, a distal end, an exterior major surface, and a helical groove extending over at least a portion of the exterior major surface;

    a radiating element formed of an electrically conductive material and formed into a generally helical shape and positioned generally surrounding the elongate core, the radiating element terminating at a first end positioned adjacent the distal end of the elongate core and at a second end positioned adjacent the proximal end of the elongate core, the radiating element having a first electrical impedance; and

    an impedance matching section formed of a substantially rigid, electrically conductive material, the impedance matching section having a narrow end and a wide end, the narrow end being electrically and mechanically connected to the second end of the radiating element, the wide end adapted for connection to an electrical connector, the impedance matching section having a second electrical impedance at the narrow end for matching the first electrical impedance of the radiating element and having a third electrical impedance at the wide end for matching a fourth electrical impedance of the electrical connector, in which the impedance matching section is seated in the helical groove on the elongate core at a point adjacent to the proximal end of the elongate core.

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