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Antenna, radio device, method of designing antenna, and method of measuring operating frequency of antenna

  • US 7,330,161 B2
  • Filed: 09/28/2006
  • Issued: 02/12/2008
  • Est. Priority Date: 10/03/2005
  • Status: Active Grant
First Claim
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1. An antenna comprising:

  • a first conductive layer having plural elements disposed adjacently to and distanced from each other on a same plane;

    a second conductive layer disposed at a predetermined distance from the first conductive layer via a dielectric; and

    an LC resonance circuit comprising connection for respectively electrically connecting the elements of the first conductive layer and the second conductive layer,wherein the LC resonance circuit is constructed to take a resonance state in which impedance is increased in an operating frequency of the antenna,wherein a power feeding section is provided in each of any two adjacent elements of the plural elements,wherein, during transmission, power is fed to the power feeding sections so that signals of the operating frequency are in an opposite phase relation to each other, andwherein, during reception, signals of the operating frequency inputted to the two elements are outputted in an opposite phase relation to each other from the power feeding sections.

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