NZ768500B2 - Rfid multi-read portal - Google Patents
Rfid multi-read portal Download PDFInfo
- Publication number
- NZ768500B2 NZ768500B2 NZ768500A NZ76850018A NZ768500B2 NZ 768500 B2 NZ768500 B2 NZ 768500B2 NZ 768500 A NZ768500 A NZ 768500A NZ 76850018 A NZ76850018 A NZ 76850018A NZ 768500 B2 NZ768500 B2 NZ 768500B2
- Authority
- NZ
- New Zealand
- Prior art keywords
- reading zone
- articles
- rfid
- groups
- reading
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10019—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers.
- G06K7/10079—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves resolving collision on the communication channels between simultaneously or concurrently interrogated record carriers. the collision being resolved in the spatial domain, e.g. temporary shields for blindfolding the interrogator in specific directions
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
- G06K7/10415—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
- G06K7/10415—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM
- G06K7/10425—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being fixed in its position, such as an access control device for reading wireless access cards, or a wireless ATM the interrogation device being arranged for interrogation of record carriers passing by the interrogation device
Abstract
RFID portal reads multiple associated RFID tags on articles in groups moved through an RFID code reader having interrogation /charging and receiving/detection antennas concentrated on the group when in a reading zone. The articles are movable through a passage between the reading zone and an outside area. The passage has conductive walls at the reading zone associated with antennas for applying and collecting focused RF signals, and the walls define a vestibule lined with broadband or specific stopband electromagnetic damping structures as well as elongating signal paths into and/or out of the reading zone. Attenuation by one or more of broadband and stopband damping and signal path elongation can achieve 10 dB attenuation or more, sufficient to minimize interaction with stray RFID tagged articles that may be outside of the group in the reading zone.
Claims (16)
1. An apparatus for reading multiple RFID codes carried by articles in a group, comprising: an RF code reader including interrogation and response detection antennas directed inwardly into a shielding enclosure configured to concentrate RF signals in a reading zone, with controls for applying an RF charging signal in at least one predetermined frequency band and discerning RFID codes from responsive signals received from tagged articles in the group; wherein at least one passage is provided through the shielding enclosure, through which the articles are movable between the reading zone and an area outside of the shielding enclosure, the passage extending through a vestibule leading into and/or out of the reading zone, the vestibule being configured to attenuate reflected electromagnetic energy in the predetermined frequency band and comprising electromagnetic damping structures; and wherein the shielding enclosure comprises at least two opposite electrically conductive walls each with at least one surface facing the passage, wherein at reading zone, the electrically conductive walls are configured to homogeneously distribute RF energy over the articles in the reading zone, wherein at the vestibule, the surfaces of the electrically conductive walls facing the passage carry the electromagnetic damping structures for attenuating electromagnetic energy at least in the predetermined frequency band so as to limit effective interaction with any stray RFID tagged articles outside the shielding enclosure wherein the electrically conductive walls define lengths extending along two opposite sidewalls of the vestibule, including focusing portions at the reading zone defining two clamshell shapes on two opposite sidewalls of the vestibule, wherein each of the two clamshell shapes are formed by five clamshell shaped wall portions of the electrically conductive walls, wherein five antennas being five antenna segments are mounted on the five clamshell shaped wall portions, the five antenna segments being directed inwardly toward the reading zone, and the clamshell shaped wall portions of the electrically conductive walls form clamshell reflective structures around the antennas, the clamshell reflective structures being configured not only to focus signal strength on the reading zone but also to elongate propagation paths of the RF signals that are reflected transversely and finally obliquely across the reading zone.
2. The apparatus of claim 1, wherein a bottom of the passage is configured as a pan of a weigh scale, whereby measured weight of a cart is compared to expected weights as a result of RFID code scanning results, after summing the expected weights based on stored weight data cross referenced to RFID codes.
3. The apparatus of claim 1 or 2, wherein the clamshell shapes are parabolic for focusing the signal strength, and wherein the focusing portions defining the clamshell shapes include additional structures for directing electromagnetic energy to and from the antennas, the additional structures comprising Fresnel parabolic segments or meta-material waveguides.
4. The apparatus of any preceding claim, wherein the electromagnetic damping structures comprise at least one of a Salisbury composite surface, a broadband RF attenuating material and an attenuating structure and a geometry along one or more propagation paths between the reading zone and an outside, configured to attenuate electromagnetic reflection at an RFID frequency band.
5. The apparatus of claim 4, wherein the damping structures are configured to attenuate electromagnetic propagation between the RF code reader and the stray RFID tagged articles by at least 10 dB.
6. The apparatus of claim 1, wherein the electromagnetic damping structures are configured to damp electromagnetic reflection at a frequency within a UHF RFID frequency band of substantially 860 to 960 MHz.
7. The apparatus of claim 1, wherein the electrically conductive walls are electromagnetically reflective at the reading zone and configured to concentrate direct RF energy and reflected indirect RF energy between the antennas and the RFID tags carried by articles in the group of articles when in the reading zone.
8. The apparatus of claim 1, wherein the passage and the shielding enclosure are configured to accommodate a shopping cart.
9. A method using the apparatus of any of claims 1 to 8 for reading multiple RFID codes carried by articles, comprising the steps of: associating the articles in groups of plural articles in proximity to one another for reading the multiple RFID codes; moving the groups successively into the RF code reader including interrogation and response detection antennas directed inwardly into the shielding enclosure configured to concentrate RF signals in a reading zone accommodating one of the groups, and processing the groups by applying the RF charging signal in the at least one predetermined frequency band and discerning the RFID codes from responsive signals received from tagged articles in the one group; and limiting at least one of a residence time during which the groups remain in the reading zone and a processing time during which the interrogation and response antennas are active, to a time only sufficient to process a substantial majority of the RFID codes in the groups.
10. The method of claim 9, further comprising limiting at least one of an amplitude of the charging signal, sensitivity of reception of the responsive signals, and time of application of the charging and responsive signals to be only sufficient to process a substantial majority of RFID codes in the groups.
11. The method of claim 9, wherein the associating articles in groups comprises at least one of carrying the groups of plural articles in respective containers and supporting the groups on at least one powered movable conveyance.
12. The method of claim 9, comprising varying the residence time during which the groups remain in the reading zone for interrogation of the RFID codes.
13. The method of claim 12, comprising varying the residence time during which the groups remain in the reading zone by at least one of signaling a human operator for one of speeding up, slowing, pausing, stopping movement of the containers and controlling an operational speed of the movable conveyance.
14. The method of claim 11, wherein the containers comprise at least one of bins, bags, slings and rolling carts.
15. The method of claim 9, comprising attenuating the electromagnetic energy in a stopband encompassing the predetermined frequency band using a Salisbury damping configuration having a conductive surface spaced from a conductive backplane by a distance determined from a wavelength of the predetermined frequency band.
16. The method of claim 9, comprising variably limiting at least one of the residence time, the processing time, an amplitude of the charging signal, sensitivity of reception of the responsive signals, and a time of application of the charging and responsive signals, according to at least one of a predicted time to process said substantial majority for successive ones of the groups, and an empirical rate of processing based on a rate of reading a preliminary sampling of the RFID codes in the successive groups.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201862654702P | 2018-04-09 | 2018-04-09 | |
| PCT/US2018/067659 WO2019199361A2 (en) | 2018-04-09 | 2018-12-27 | Rfid multi-read portal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| NZ768500A NZ768500A (en) | 2024-07-05 |
| NZ768500B2 true NZ768500B2 (en) | 2024-10-08 |
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