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High performance antenna for hand-held and portable equipment

  • US 5,337,061 A
  • Filed: 02/12/1992
  • Issued: 08/09/1994
  • Est. Priority Date: 02/12/1991
  • Status: Expired due to Fees
First Claim
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1. A portable electronic apparatus having a housing made, at least in part, of insulating material, and incorporating an antenna comprising an active element and a ground plane, said active element comprising a length of conductive material disposed parallel to the ground plane and fed from one end;

  • wherein the antenna is mounted on a sheet of insulating material forming part of said housing, and comprises a first rectangular sheet of conductive material forming said ground plane, and a second, elongate, rectangular sheet of conductive material forming said active element; and

    wherein the housing is in two sections which are movable with respect to one another, and wherein said sheet of insulating material forms part of one of said sections, and wherein the other section contains electronic circuitry which is electrically connected to said antenna; and

    wherein said other section includes a second antenna which is likewise electrically connected to said electronic circuitry; and

    wherein both antennae are connected to said electronic circuitry via the same node; and

    wherein said antennae are electrically mismatched as seen by the electronic circuitry; and

    wherein a mechanical tuning element is attached for movement with one of said sections of the housing, said tuning element being positioned such that as the two sections are moved with respect to one another, the element detunes one of the antennae, but not the other, thus introducing an electrical mismatch between them.

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