Near-field electromagnetic induction device
AssigneeNXP B.V.
InventorsAnthony Kerselaers, Liesbeth Gommé
Life of this patent
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Abstract
One example discloses a near-field electromagnetic induction (NFEMI) device, including: a near-field magnetic antenna having an inductive coil responsive to near-field magnetic signals; wherein the near-field magnetic antenna is configured to be coupled to a tuning circuit having a variable capacitance adjusting a resonance frequency of the NFEMI device and variable resistance adjusting a bandwidth of the NFEMI device; and a near-field electric antenna having a set of conductive surfaces; wherein the near-field electric antenna is configured to be directly connected to a receiver circuit.
Claims15
A near-field electromagnetic induction (NFEMI) device, comprising:
- a near-field magnetic antenna having an inductive coil responsive to near-field magnetic signals;
- wherein the near-field magnetic antenna is configured to be coupled to a tuning circuit having a variable capacitance adjusting a resonance frequency of the NFEMI device and variable resistance adjusting a bandwidth of the NFEMI device;
- and
- a near-field electric antenna having a set of conductive surfaces;
- wherein the near-field electric antenna is configured to be directly connected to a receiver circuit;
- wherein one of the conductive surfaces is configured to be directly connected to a first input of an LNA in the receiver circuit;
- and
- wherein another one of the conductive surfaces is configured to be directly connected to a second input of the LNA.
A near-field electromagnetic induction device, comprising:
- a near-field magnetic antenna having a first-end-point and a second-end-point;
- wherein the near-field magnetic antenna includes a first inductor (L1) coupled to the first-end-point, a second inductor (L2) coupled to the second-end-point, and the first and second inductors coupled together at a mid-point;
- a near-field electric antenna having a first conductive surface and a second conductive surface;
- wherein the first-end-point of the magnetic antenna is coupled to the first conductive surface of the electric antenna, and is configured to be coupled to a near-field receiver circuit;
- wherein the second-end-point of the magnetic antenna is coupled to the second conductive surface of the electric antenna, and is configured to be coupled to the near-field receiver circuit;
- wherein the mid-point of the magnetic antenna is configured to be coupled to the near-field transmitter circuit;
- wherein the receiver circuit includes a first feed-point and a second feed-point;
- wherein the first conductive surface of the electric antenna is directly coupled to the first feed-point of the receiver circuit;
- and
- wherein the second conductive surface of the electric antenna is directly coupled to the second feed-point of the receiver circuit.
Dependencies are inferred from the claim text.