Switchable rfid card reader antenna
AssigneeHoneywell International Inc.
InventorsGlen Backes, Robert Charles Becker, Alan Cornett
Life of this patent
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Abstract
An antenna includes a plurality of loops and a plurality of double pole double throw (DPDT) switches. The plurality of DPDT switches is coupled to the plurality of loops. The DPDT switches are configured to cause a change in direction of current in one or more of the plurality of loops, thereby altering a direction of a magnetic field in one or more of the plurality of loops, such that a device positioned at a plurality of positions in relation to the antenna is electromagnetically coupled to the antenna at the plurality of positions.
Claims20
An antenna comprising:
- a plurality of loops;
- and
- a plurality of double pole double throw (DPDT) switches, the plurality of DPDT switches coupled to the plurality of loops;
- wherein the DPDT switches are configured to cause a change in direction of current in one or more of the plurality of loops, thereby altering a direction of a magnetic field in one or more of the plurality of loops, such that a device positioned at a plurality of positions in relation to the antenna is electromagnetically coupled to the antenna at the plurality of positions.
An antenna comprising:
- a plurality of adjacent loops;
- and
- a plurality of double pole double throw (DPDT) switches, each of the plurality of DPDT switches positioned between two of the plurality of adjacent loops;
- wherein the DPDT switches are configured to cause a change in direction of current in one or more of the plurality of adjacent loops, thereby altering a direction of a magnetic field in one or more of the plurality of adjacent loops, such that a device positioned at a plurality of positions in relation to the antenna is electromagnetically coupled to the antenna at the plurality of positions.
An antenna comprising:
- a plurality of adjacent loops;
- and
- a plurality of double pole double throw (DPDT) switches, each of the plurality of DPDT switches positioned between two of the plurality of adjacent loops;
- wherein the plurality of adjacent loops comprises four adjacent loops;
- and
- wherein the four adjacent loops are positioned in the same plane and form an upper right quadrant, an upper left quadrant, a lower right quadrant, and a lower left quadrant;
- wherein a first DPDT switch is positioned between the upper left quadrant and the lower left quadrant, a second DPDT switch is positioned between the upper right quadrant and the lower right quadrant, and a third DPDT switch is positioned between the upper right quadrant and the upper left quadrant or the lower right quadrant and the lower left quadrant;
- and
- wherein the DPDT switches are configured to cause a change in direction of current in one or more of the plurality of adjacent loops, thereby altering a direction of a magnetic field in one or more of the plurality of adjacent loops, such that a device positioned at a plurality of positions in relation to the antenna is electromagnetically coupled to the antenna at the plurality of positions.
Dependencies are inferred from the claim text.