Antenna device for portable equipment

  • US 5,757,325 A
  • Filed: 05/24/1995
  • Issued: 05/26/1998
  • Est. Priority Date: 10/29/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. In an apparatus which includes a helical antenna element disposed on a case of a radio circuit;

  • impedance transforming circuitry connected to said helical antenna element and to said radio circuit; and

    an antenna element which can be accommodated in or extended outside of said case through said helical antenna element;

    the improvement comprising said helical antenna element and said antenna element each having a one-half wave length, and connecting means for conductively and directly connecting said impedance transforming circuitry through a conductive coupler to said antenna element when said antenna element is extended so that said helical antenna element and said antenna element are conductively and directly connected in parallel with each other to said impedance transforming circuitry.

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