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Portable radio device

  • US 6,285,893 B1
  • Filed: 02/04/1999
  • Issued: 09/04/2001
  • Est. Priority Date: 02/09/1998
  • Status: Expired due to Fees
First Claim
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1. A portable radio device comprising:

  • a radio communication unit for processing an information signal transmitted by radio waves;

    a device housing for holding said radio device and removably fitted to a mobile body;

    a plurality of antennas dispersedly disposed at positions away from one another in said device housing;

    a plurality of sensors provided corresponding to said plurality of antennas respectively for detecting an object close to said device housing; and

    a switching circuit for comparing detection results of said respective sensors and selectively switching one of said antennas to be connected to said radio communication unit wherein said switching circuit receives detection outputs from said plurality of sensors, determines the fitting surface of said device housing in contact with the mobile body, and selects one of said antennas corresponding to the fitting surface when said radio communication unit is started.

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