Antenna with active elements
AssigneeEthertronics, Inc.
InventorsJeffrey Shamblin, Chulmin Han, Rowland Jones, Sebastian Rowson, Laurent Desclos
Life of this patent
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Abstract
A multi-frequency antenna comprising an IMD element, one or more active tuning elements and one or more parasitic elements. The IMD element is used in combination with the active tuning and parasitic elements for enabling a variable frequency at which the antenna operates, wherein, when excited, the parasitic elements may couple with the IMD element to change an operating characteristic of the IMD element.
Claims18
An antenna capable of active frequency shifting, comprising:
- a spiral-shaped conductor element substantially disposed within a horizontal plane and having at least one slot portion therein, said conductor element disposed within said horizontal plane being positioned at a distance above a ground plane to form a volume of the antenna therebetween;
- at least one parasitic element positioned at least partially within said volume of the antenna;
- and
- at least one active tuning element connected to said parasitic element and adapted for one or more of:
- switching said parasitic element to ground, or varying a reactance for tuning the antenna.
An antenna capable of active frequency shifting, comprising:
- a spiral-shaped conductor having a first parallel conductor portion connected to a second parallel conductor portion by a first perpendicular conductor portion extending therebetween, said first parallel conductor portion further connected to a third parallel conductor portion by a second perpendicular conductor portion extending therebetween, said first through third parallel conductor portions and said first and second perpendicular conductor portions each disposed within a common plane, wherein said first and second parallel conductor portions are spaced apart at a first slot portion and adapted to form a capacitive coupling therebetween, and wherein said first through third parallel conductor portions and said first and second perpendicular conductor portions are arranged to provide a loop current along said spiral-shaped conductor;
- at least one parasitic element positioned near said spiral-shaped conductor and adapted to shift a resonant frequency characteristic of the spiral-shaped conductor;
- and
- at least one active tuning element connected to said parasitic element and adapted for one or more of:
- switching said parasitic element to ground, or varying a reactance for tuning the antenna.
An antenna capable of active frequency shifting, comprising:
- a spiral-shaped planar conductor element substantially disposed within a horizontal plane and positioned at a height above a ground plane, said spiral-shape planar conductor element having one or more slot portions;
- and
- a parasitic element positioned between said ground plane and said slot portion for tuning a resonant frequency characteristic of the antenna, wherein said parasitic element is connected to an active tuning element for actively adjusting a coupling between said parasitic element and said spiral-shaped planar conductor element.
Dependencies are inferred from the claim text.