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Antenna apparatus

  • US 6,784,850 B2
  • Filed: 03/14/2002
  • Issued: 08/31/2004
  • Est. Priority Date: 06/27/2001
  • Status: Expired due to Fees
First Claim
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1. An antenna apparatus comprising:

  • a base plate having one surface provided with a ground conductor;

    a helical antenna section attached to the base plate and provided with an n-number of antenna-elements helically formed at an angular distance of (360/n)°

    therebetween, each antenna element including a straight portion extending parallel to the axis of the helical antenna section; and

    a radio frequency signal supplier which is provided on the other surface of the base plate and supplies power to the n-number of antenna elements of the helical antenna with a phase difference of (360/n)°

    ;

    said straight portion having a lenath corresponding to about one-fourth of the height of the helical antenna section.

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