Microwave tolerant RFID system and components
AssigneeAvery Dennison Retail Information Services LLC
InventorsIan J. Forster, Norman A. Howard, Panagiotis Petridis, Muhammad Rizwan
Life of this patent
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Abstract
In some embodiments, a radio frequency identification (RFID) system may include at least one Ultra High Frequency (UHF) antenna component, a conductive loop having a largest dimension that is smaller than the wavelength of radiation transmitted at a Microwave Frequency (MW). The conductive loop may define a gap and an RFID chip may be electrically coupled to the conductive loop. The conductive loop may be configured to be resonant at an Ultra High Frequency (UHF) and less resonant at Microwave Frequency (MW). The antenna component may be selected from the group consisting of a dipole antenna, a monopole antenna, a loop antenna, or a slot antenna.
Claims51
A radio frequency identification (RFID) system comprising:
- at least one Ultra High Frequency (UHF) antenna component, wherein the UHF lies in a range between 860 MHz to 930 MHz;
- at least one conductive loop coupled to a RFID chip and having a largest dimension that is smaller than the wavelength of radiation transmitted at a Microwave Frequency (MW) of 2.45 GHz, wherein the conductive loop is configured to couple with the UHF antenna component,
- wherein the conductive loop and the antenna component are positioned relative to each other to cause the conductive loop to have peak resonance within the UHF range and sufficiently limited resonance at the MW to prevent arcing in a microwave,
- wherein a maximum dimension of the conductive loop is up to 30% of a longest wavelength of radiation transmitted at the MW to prevent destructive field concentration and arcing during microwave exposure.
A conductive loop for radio frequency communication, comprising
- a gap and an RFID chip electrically coupled to the conductive loop across the gap, the conductive loop being configured to have peak resonance at an Ultra High Frequency (UHF),
- wherein the UHF lies in a range between 860 MHz to 930 MHz and having a largest dimension that is smaller than the wavelength of radiation transmitted at Microwave Frequency (MW) of 2.45 GHZ, and
- wherein a maximum dimension of the conductive loop is up to 30% of a longest wavelength of radiation transmitted at the MW to prevent destructive field concentration and arcing during microwave exposure.
A method of utilizing a conductive loop for radio frequency communication with tolerance to Microwave Frequency exposure, the method comprising:
- receiving a microwavable merchandising package having the conductive loop configured to resist exposure to Microwave Frequency (MW) and having an RFID chip, the conductive loop being coupled to the RFID chip, the conductive loop having a largest dimension that is smaller than the wavelength of radiation transmitted at a Microwave Frequency of 2.45 GHZ, wherein the conductive loop is configured to be operable at an Ultra High Frequency (UHF), and wherein the UHF lies in a range between 860 MHz to 930 MHz;
- conducting an inventory reading of the microwavable merchandising package through a far field radio frequency communication by coupling the conductive loop to at least one UHF antenna, wherein the conductive loop and the at least one UHF antenna is positioned relative to each other to cause the conductive loop to have peak resonance within the UHF range and sufficiently limited resonance at the MW to prevent arcing in a microwave,
- wherein a maximum dimension of the conductive loop is up to 30% of a longest wavelength of radiation transmitted at the MW to prevent destructive field concentration and arcing during microwave exposure;
- cooking the microwavable merchandising package by exposing the merchandising package to the MW radiation in a microwave cavity;
- and
- reading the RFID chip associated with the conductive loop directly in a near field communication employing a near field reader.
Dependencies are inferred from the claim text.