Uncontrolled passive radio frequency identification tag and system with 3-D positioning
First Claim
Patent Images
1. A passive radio frequency (RF) identification (pRFID) tag comprising:
- at least one frequency-dependent circuit configured to provide a unique frequency-dependent response to be transmitted at least one predetermined frequency in response to receiving said at least one predetermined frequency, wherein the frequency-dependence of the response conveys the tag'"'"'s identification, and wherein provision of the unique frequency-dependent response is not performed under the control of control logic.
1 Assignment
0 Petitions
Accused Products
Abstract
Passive radio frequency identification tags comprising a simple antenna and a circuit with a unique frequency-dependent response, in place of an RF-powered integrated circuit with control logic, is disclosed. The unique frequency-dependence of the circuit, which may simply be a feature of the antenna, conveys the tags identification. Multiple frequency-dependent circuit RFID tags can be simultaneously identified and located in 3-D space through use of antenna arrays and sampling at multiple frequencies in order to provide spatial resolution.
20 Citations
21 Claims
-
1. A passive radio frequency (RF) identification (pRFID) tag comprising:
at least one frequency-dependent circuit configured to provide a unique frequency-dependent response to be transmitted at least one predetermined frequency in response to receiving said at least one predetermined frequency, wherein the frequency-dependence of the response conveys the tag'"'"'s identification, and wherein provision of the unique frequency-dependent response is not performed under the control of control logic. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
14. A radio frequency identification (RFID) tag system comprising:
-
a passive radio frequency (RF) identification (pRFID) tag comprising at least one frequency-dependent circuit configured to provide a unique frequency-dependent response to be transmitted at least one predetermined frequency in response to receiving said at least one predetermined frequency, wherein frequency-dependence of the response conveys the tag'"'"'s identification, and wherein provision of the unique frequency-dependent response is not performed under the control of control logic; and an RFID reader configured to illuminate said tag with RF energy, observe one or more responses at said at least one predetermined frequency, and decode said one or more responses to a unique tag ID. - View Dependent Claims (15, 16, 17, 18, 19)
-
-
20. A radio frequency identification (RFID) tag system comprising:
-
a passive radio frequency (RF) identification (pRFID) tag comprising; a circuit pattern configured to have a unique response for each one of a plurality of predetermined frequencies of RF energy when illuminated by a spectrum of said RF energy; and an RFID reader to illuminate said tag with said spectrum of RF energy, observe responses at multiple excitation frequencies, and decode said responses to a unique tag ID, wherein said response is a spectral response observed by a qth antenna of the RFID reader at a pth frequency according to a measurement defined by;
-
-
21. A radio frequency identification (RFID) tag system comprising:
-
a passive radio frequency (RF) identification (pRFID) tag comprising; a circuit pattern that is configured to provide a unique linear/nonlinear response when the tag is illuminated by a particular frequency of RF energy; and an RFID reader to illuminate said tag with said spectrum of RF energy, observe responses at multiple excitation frequencies, and decode said responses to a unique tag ID, wherein said response is a spectral response observed by a qth antenna of the RFID reader at a pth frequency according to a measurement defined by;
-
Specification