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Antenna device and radio device comprising the same

  • US 6,147,650 A
  • Filed: 02/18/1999
  • Issued: 11/14/2000
  • Est. Priority Date: 02/24/1998
  • Status: Expired due to Term
First Claim
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1. An antenna device, comprising:

  • a substrate made of an insulation material and including a first major surface and a second major surface face;

    a ground electrode provided substantially on the whole of the first major surface of said substrate;

    an inverted F-shape antenna, comprising;

    a first radiation electrode disposed on the second major surface of said substrate and having a first open end and a first ground end;

    a first connecting electrode connecting said first ground end and said ground electrode; and

    a feeding electrode provided in the vicinity of the first ground end of said first radiation electrode and having one end connected to said first radiation electrode;

    a microstrip antenna, comprising;

    a second radiation electrode disposed on the second main surface of said substrate and having one open second end and a second ground end; and

    a second connecting electrode connecting said second ground end and said ground electrode;

    the second open end of said second radiation electrode of said microstrip antenna and said feeding electrode of said inverted F-shape antenna being capacitively coupled to each other; and

    a first direction through the first open end and the first ground end of said first radiation electrode being substantially perpendicular to a second direction through the second open end and the second ground end of said second radiation electrode.

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