Apparatus and method for wireless communication with improved reliability

1. An apparatus for facilitating wireless communication, comprising:

a base comprising a flat top surface and a bottom surface, the base having a reference plane parallel to the bottom surface and a plurality of bumps patterned on the top surface;

a plurality of coils, said coils disposed adjacent said flat top surface and being tuned to a near field communication frequency, and each of the plurality of coils being angled with respect to said flat top surface by contact with at least one of the plurality of bumps disposed on said flat top surface;

an input/output terminal; and

a switching device selectively coupling the coils to the input/output terminal,

wherein:

the coils are arranged radially on a periphery of the top surface; and

each of the coils has an elevation angle between 5 and 20 degrees.

2. The apparatus of claim 1 , wherein the coils comprise a plurality of square coils.

3. The apparatus of claim 2 , wherein the coils comprise at least nine square coils.

4. The apparatus of claim 1 , wherein a first one of the coils has a square shape and a second one of the coils has a rectangular shape.

5. The apparatus of claim 1 , wherein the switching device comprises a relay switch equidistant from the coils.

6. The apparatus of claim 1 further comprising a controller coupled to the switching device and performing operations.

7. The apparatus of claim 6 , wherein the operations comprise:

causing the switching device to sequentially connect the coils to the input/output terminal for a time interval; and

causing the switching device to interrupt the sequential connection and to initiate NFC communication via a selected one of the coils upon detection of a feedback signal, from the selected coil, above a threshold.

8. The apparatus of claim 6 , further comprising:

a filter coupled to switching device; and

wherein the operations comprise:

receiving a plurality of feedback signals, each of the feedback signals being associated with a respective one of the coils;

reconfiguring circuitry to filter the feedback signals with the filter;

identifying a trigger signal from the feedback signals, the trigger signal being greater than a threshold and being associated with a selected one of the coils; and

causing the switching device to connect an NFC communication module with the selected coil via the input/output terminal.

9. The apparatus of claim 6 , wherein the input/output terminal couples the controller with the switching device.

10. The apparatus of claim 8 , wherein:

the filter comprises a band-pass filter; and

the operations further comprise:

sending a request, via the NFC communication module using the selected coil, for communication with an NFC device;

receiving a response from the NFC device through the selected coil; and

sending a communication command to the NFC device using the selected coil.

11. The apparatus of claim 8 , wherein receiving the feedback signals comprises:

causing the switching device to couple the controller with different ones of the coils for a time interval; and

estimating a signal-to-noise ratio of the feedback signals during the time interval.

12. The apparatus of claim 7 , wherein the operations comprise:

receiving a plurality of feedback signals, each of the feedback signals being associated with a respective one of the coils;

determining whether at least one of the feedback signals is above the threshold;

when at least one of the feedback signals is above the threshold, causing the switching device to couple an NFC communication module with the coils associated with feedback signals above the threshold via the input/output terminal; and

when none of the feedback signals is above the threshold:

amplifying the feedback signals, each of the amplified signals being associated with at least one of the coils;

identifying a plurality of amplified signals above the threshold; and

causing the switching device to simultaneously couple the NFC communication module with the coils associated with the amplified signals above the threshold via the input/output terminal.

13. The apparatus of claim 8 , wherein the controller is coupled to a proximity sensor; and

the operations comprise transmitting instructions to a power management module to exit a power-saving mode when the proximity sensor detects presence of a target device.

14. The apparatus of claim 1 , wherein the input/output terminal is disposed on a side surface of the base.

15. The apparatus of claim 1 , wherein the coils comprise printed coils.

16. An automated teller machine system comprising:

a user interface;

a cash dispenser; and

an NFC communication module,

wherein the NFC communication module comprises:

a base comprising a flat top surface and a bottom surface, the base having a reference plane parallel to the bottom surface and a plurality of bumps patterned on the top surface;

a plurality of coils, said coils disposed adjacent said flat top surface and being tuned to a near field communication frequency, and each of the plurality of coils being angled with respect to said flat top surface by contact with at least one of the plurality of bumps disposed on said flat top surface;

an input/output terminal; and

a switching device selectively coupling the coils to the input/output terminal

wherein:

each of the coils has an elevation angle between 5 and 20 degrees; and

the coils are symmetrically arranged with respect to a center of the top surface.

17. A method for communicating with an NFC device comprising:

receiving a plurality of feedback signals, the feedback signals being associated with respective ones of a plurality of communication coils, the coils:

being mounted on a base comprising a flat top surface and a bottom surface, the base having a plurality of bumps patterned on the top surface;

disposed adjacent said flat top surface, and each of the plurality of coils being angled with respect to said flat top surface by contact with at least one of the plurality of bumps disposed on said flat top surface;

being tuned to a near field communication frequency; and

having elevation angles between 5 and 20 degrees;

identifying a trigger signal from the feedback signals, the trigger signal being greater than a threshold and being associated with a selected one of the coils;

causing a switching device coupled to the coils to connect an NFC communication module with the selected coil via an input/output terminal; and

initiating NFC communications with the NFC device using the selected coil.