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Antenna apparatus

  • US 6,337,668 B1
  • Filed: 02/28/2000
  • Issued: 01/08/2002
  • Est. Priority Date: 03/05/1999
  • Status: Expired due to Fees
First Claim
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1. An antenna apparatus comprising:

  • a first antenna element installed on a base plate for transmitting or receiving electromagnetic waves;

    a parasitic second antenna element installed on said base plate;

    a first capacitor provided between an end of said second antenna element and said base plate; and

    a switch circuit provided between, in parallel with said first capacitor, said end of said second antenna element and said base plate, for turning on to cause said second antenna element to act as a reflector and for turning off to cause said second antenna element to act as a director.

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