Radio frequency identification tag identification system
First Claim
Patent Images
1. A method for processing items on which radio frequency identification tags are disposed, comprising:
- providing a conveyor that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon;
providing an antenna disposed proximate the path of travel, wherein the antenna comprises at least one first element and at least one second element, and wherein the at least one first element is disposed upstream from the at least one second element with respect to the path of travel;
radiating radio frequency signals into the path of travel from the antenna and receiving, at the antenna, responses to the radio frequency signals from radio frequency identification tags disposed on the items being conveyed by the conveyor through the path of travel;
at circuitry that is in communication with the conveyor, receiving signals from the at least one first element and the at least one second element corresponding to the responses;
at the circuitry, determining a difference between magnitude of a said signal corresponding to the response from the at least one first element and magnitude of a said signal corresponding to the response from the at least one second element; and
at the circuitry, associating information corresponding to a said radio frequency tag with a said item based upon when the difference reaches a minimum.
3 Assignments
0 Petitions
Accused Products
Abstract
A conveyor system for processing items on which radio frequency identification tags are disposed has a conveyor that conveys items through a path of travel, and an antenna disposed proximate the path of travel. Circuitry in communication with the antenna may associate RFID tag data with a package on the conveyor based on a difference signal from elements in the antenna.
-
Citations
14 Claims
-
1. A method for processing items on which radio frequency identification tags are disposed, comprising:
-
providing a conveyor that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon; providing an antenna disposed proximate the path of travel, wherein the antenna comprises at least one first element and at least one second element, and wherein the at least one first element is disposed upstream from the at least one second element with respect to the path of travel; radiating radio frequency signals into the path of travel from the antenna and receiving, at the antenna, responses to the radio frequency signals from radio frequency identification tags disposed on the items being conveyed by the conveyor through the path of travel; at circuitry that is in communication with the conveyor, receiving signals from the at least one first element and the at least one second element corresponding to the responses; at the circuitry, determining a difference between magnitude of a said signal corresponding to the response from the at least one first element and magnitude of a said signal corresponding to the response from the at least one second element; and at the circuitry, associating information corresponding to a said radio frequency tag with a said item based upon when the difference reaches a minimum.
-
-
2. A method for processing items on which radio frequency identification tags are disposed, comprising:
-
providing a conveyor that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon; providing a sensor disposed proximate the path of travel so that the sensor detects presence of items in the path of travel; providing an antenna disposed proximate the path of travel so that the antenna radiates radio frequency signals into the path of travel, including to a predetermined position in the path of travel, wherein the antenna comprises at least one first element and at least one second element, and wherein the at least one first element is disposed upstream from the at least one second element with respect to the path of travel; radiating radio frequency signals into the path of travel, including the predetermined position, from the antenna and receiving, at the antenna, responses to the radio frequency signals from radio frequency identification tags disposed on the items being conveyed by the conveyor through the path of travel; at circuitry that is in communication with the conveyor, receiving signals from the at least one first element and the at least one second element corresponding to the responses; at the circuitry, determining a difference between magnitude of a said signal corresponding to the response from the at least one first element and magnitude of a said signal corresponding to the response from the at least one second element, wherein the antenna is disposed with respect to the path of travel so that the difference is at a minimum when the radio frequency identification tag from which the at least one first element and the at least one second element receive the responses is at the predetermined position; and at the circuitry, associating information corresponding to a said radio frequency identification tag with a said item based upon proximity of the item to the predetermined position when the difference reaches the minimum. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A method for processing items on which radio frequency identification tags are disposed, comprising:
-
providing a conveyor that conveys items through a path of travel, each item having at least one respective radio frequency identification tag disposed thereon; providing a sensor disposed proximate the path of travel so that the sensor detects presence of items in the path of travel; providing an antenna disposed proximate the path of travel so that the antenna radiates radio frequency signals into the path of travel, including to a predetermined position in the path of travel, wherein the antenna comprises at least one first element and at least one second element, and wherein the at least one first element is disposed upstream from the at least one second element with respect to the path of travel; radiating radio frequency signals into the path of travel, including the predetermined position, from the antenna and receiving, at the antenna, responses to the radio frequency signals from radio frequency identification tags disposed on the items being conveyed by the conveyor through the path of travel; at circuitry that is in communication with the conveyor, receiving signals from the at least one first element and the at least one second element corresponding to the responses, wherein, for respective said responses, a first magnitude corresponds to a difference between magnitude of a said signal corresponding to the response from the at least one first element and magnitude of a said signal corresponding to the response from the at least one second element, and a second magnitude corresponds to a sum of the magnitude of the signal from the at least one first element and the magnitude of the signal from the at least one second element; at the circuitry, for respective instances of said signals from the at least one first element and the at least one second element, determining a first difference between the first magnitude and the second magnitude; at the circuitry, for respective instances of said signals from the at least one first element and the at least one second element received correspondingly to responses from an individual radio frequency identification tag, determining a second difference between the first difference for each said correspondingly received respective instance and the first difference from a preceding said correspondingly received respective instance, wherein the antenna is disposed with respect to the path of travel so that the first magnitude is at a minimum when the radio frequency identification tag from which the at least one first element and the at least one second element receive the responses is at the predetermined position and the second magnitude is at a maximum when the radio frequency identification tag from which the at least one first element and the at least one second element receive the responses is at the predetermined position; and at the circuitry, monitoring the first and second magnitudes and associating information corresponding to the individual radio frequency identification tag with a said item based upon change in polarity of the second difference.
-
Specification