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Antenna device and radio communication apparatus

  • US 7,372,426 B2
  • Filed: 11/22/2005
  • Issued: 05/13/2008
  • Est. Priority Date: 11/24/2004
  • Status: Expired due to Fees
First Claim
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1. An antenna device, comprising:

  • an antenna main body having at least three electricity feeding points; and

    a feeder circuit for feeding an electrical signal to the antenna main body,wherein the feeder circuit includes a strip line for connecting each feeding point, the strip line having a first path and a second path, wherein the second path has a phase delay; and

    a switch which switches between the first path and the second path of said strip line, and wherein the feeder circuit feeds electrical signals different in at least one of amplitude and phase to the electricity feeding points, andwherein the antenna main body includes an antenna layer, a dielectric layer, a ground layer, a cylindrical conductor for electrically connecting a center part of the antenna layer to a center part of the ground layer, and conductors connected to the antenna layer at the electricity feeding points.

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