Systems and methods for RFID-enabled pressure sensing apparatus
Methods, apparatuses and systems for radio frequency identification (RFID)-enabled information collection are disclosed, including an enclosure, a collector coupled to the enclosure, an interrogator, a processor, and one or more RFID field sensors, each having an individual identification, disposed within the enclosure. In operation, the interrogator transmits an incident signal to the collector, causing the collector to generate an electromagnetic field within the enclosure. The electromagnetic field is affected by one or more influences. RFID sensors respond to the electromagnetic field by transmitting reflected signals containing the individual identifications of the responding RFID sensors to the interrogator. The interrogator receives the reflected signals, measures one or more returned signal strength indications (“RSSI”) of the reflected signals and sends the RSSI measurements and identification of the responding RFID sensors to the processor to determine one or more facts about the influences. Other embodiments are also described.
1. A radio frequency identification (RFID)-enabled pressure sensing apparatus, comprising:
a plurality of RFID tags attached to an operatively insulating and compressible substrate having a proximal side, a distal side and at least one extension, wherein each RFID tag of the plurality of RFID tags is attached to a near field loop and is positioned on a ring element, each ring element being positioned on a foam pad, each foam pad being attached to the proximal surface of the compressible substrate; and
a collector in communication with the plurality of RFID tags, the collector comprising a microstrip patch antenna positioned on the distal side of the compressible substrate and connected to one or more microstrip lines coupling the microstrip patch antenna to the ring elements, the microstrip lines each terminating in a load element near the end of each extension,
wherein one or more of the RFID tags is energized when operably depressed to send signals via the collector to an interrogator.
2. The apparatus of claim 1 , wherein the operatively insulating and compressible substrate is comprised of fabric.
3. The apparatus of claim 2 , wherein the substrate is shaped in the form of a human hand.
4. The apparatus of claim 1 , wherein a dipole antenna which provides direct coupling to a depressed ring is partially disposed on the distal side of the compressible substrate along the at least one extension and in a location opposite to the ring elements.
5. The apparatus of claim 4 , wherein the dipole antenna includes meander lines to achieve resonance.
6. The apparatus of claim 1 , wherein secondary antennas are positioned on the at least one extension of the compressible substrate.
7. The apparatus of claim 6 , wherein the secondary antennas are microstrip patches.
8. The apparatus of claim 6 , wherein the secondary antennas are planar inverted “F” antennas.
9. The apparatus of claim 1 , further comprising a secondary antenna remote from the at least one extension.
10. The apparatus of claim 1 , further comprising the interrogator that is configured to derive information from the radio frequency signals and forward the information to a processor for analysis.
11. A radio frequency identification (RFID)-enabled pressure sensing apparatus, comprising:
a glove having a palm side and a back side and at least one digit;
a plurality of ring elements, each on a foam pad, the foam pads being attached to the palm side of the glove on the digits and palm, each ring element including an RFID sensor attached to a near field loop; and
a microstrip patch antenna on the back side of the glove, connected to one or more microstrip lines coupling the antenna to the ring elements, the microstrip lines each terminating in a load element near the end of each digit, which prevents development of a standing wave pattern, wherein pressure on a ring element activates its RFID sensor allowing the RFID sensor to transmit a signal to an interrogator.
12. The apparatus of claim 11 , wherein the glove is comprised of fabric allowing it to be removed from a hand.
13. The apparatus of claim 11 , wherein the glove is an artificial hand.
14. The apparatus of claim 11 , wherein a dipole antenna which provides direct coupling to a depressed ring is partially disposed on the surface of a digit in a location opposed to the ring elements.
15. The apparatus of claim 14 , wherein the dipole antenna includes meander lines to achieve resonance.
16. The apparatus of claim 11 , wherein secondary antennas are positioned on top of the at least one digit of the glove.
17. The apparatus of claim 16 , wherein the secondary antennas are microstrip patches.
18. The apparatus of claim 16 , wherein the secondary antennas are planar inverted “F” antennas.
19. The apparatus of claim 11 , further comprising a secondary antenna remote from the at least one digit.