US4658263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual antenna for magnetic markers
Assignee: Sensormatic Electronics Corp
•
Filing: 1985-02-11
•
Granted: 1987-04-14
•
Expires: 2005-02-11
Abstract
Abstract A dual antenna is provided for energizing and receiving a response from a closely coupled marker providing an identifiable signal. An elongated drive coil is wound on a substantially flat winding template and defines a longitudinal axis of the antenna. Each winding of the drive coil extends in a plane substantially perpendicular to the longitudinal axis. A receive coil has at least one elongated loop extending substantially parallel to the antenna axis with a first portion of the loop being overlapped by the drive coil; said first portion extending substantially perpendicular to the longitudinal axis of the antenna. One portion of the receive coil is outside the drive coil; the drive coil being substantially the same length as the marker with the receive coil being substantially as wide as the marker to optimize the signal. In one embodiment, a plurality of receive coil loops is provided to decrease the longitudinal sensitivity. Preferably, the winding template includes a U-shaped slot for receiving the first portion of the receive coil and a reduced section to receive the second portion. The template is preferably magnetic barium ferrite mixed with a plastic binder to provide a dc bias field for activation the marker. In additional embodiment, multiple receive coils are provided side-by-side to allow simultaneous reading of multiple ribbon marker.
Inventors
- 👤 Jeffrey C. Urbanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:30
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2405; G08B13/2408; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/083; G06K7/086; G08B13/2465; G08B13/2468; G08B13/2474; G08B13/2485; H; H01; H01Q; H01Q1/00; H01Q1/36; H01Q7/00; H01Q7/06; H01Q7/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
142 words
A dual antenna capable of energizing a correctly oriented, closely coupled marker providing an identifiable signal in response to an applied magnetic interrogation field and receiving the response, for utilization in card readers, product verification devices, or the like, comprising: a substantially flat elongated drive coil defining a longitudinal axis of the antenna, each individual winding of the drive coil extending in a plane substantially perpendicular to said longitudinal axis; and a receive coil having a plurality of loops of differing lengths in the direction of the longitudinal axis of the antenna, a first portion of each of said loops being overlapped by said drive coil, said first portion extending in a direction substantially perpendicular to the longitudinal axis of said antenna, said plurality of loops being operataive to decrease the longitudinal position sensitivity of the antenna in relation to the marker.
Claim 2
Dependent Claim
142 words
A dual antenna capable of energizing a correctly oriented, closely coupled marker providing an identifiable signal in response to an applied magnetic interrogation field and receiving the response, for utilization in card readers, product verification devices, or the like, comprising: a substantially flat elongated drive coil defining a longitudinal axis of the antenna, each individual winding of the drive coil extending in a plane substantially perpendicular to said longitudinal axis; and a receive coil having a plurality of loops of differing lengths in the direction of the longitudinal axis of the antenna, a first portion of each of said loops being overlapped by said drive coil, said first portion extending in a direction substantially perpendicular to the longitudinal axis of said antenna, said plurality of loops being operataive to decrease the longitudinal position sensitivity of the antenna in relation to the marker.
Claim 3
Dependent Claim
25 words
The antenna as recited in claim 1, wherein each of said loops of said received coil has a second portion remote from said drive coil.
Claim 4
Dependent Claim
67 words
The antenna as recited in claim 2, wherein each of said loops of said received coil is substantially rectangular in shape, one side of the rectangle being formed by said first portion of each of said loops overlapped by said drive coil, and a second side being formed by the second portion of each of said loops remote from and beyond an end of said drive coil.
Claim 5
Dependent Claim
27 words
The antenna as recited in claim 1, wherein said drive coil is of a length along the longitudinal axis substantially equal to the length of the marker.
Claim 6
Dependent Claim
33 words
The antenna as recited in claim 1, wherein each of said receive coil loops is substantially as wide as the marker so as to optimize the signal to noise ratio of the antenna.
Claim 7
Dependent Claim
34 words
The antenna as recited in claim 1, wherein each of said receiver loops is proportional longer than the next so as to form a uniformly stepped pattern for dividing the marker into uniform segments.
Claim 8
Dependent Claim
17 words
The antenna as recited in claim 1 wherein said of said receiver loops includes a common end.
Claim 9
Dependent Claim
17 words
The antenna as recited in claim 7, wherein said common end is remote from said drive coil.
Claim 10
Dependent Claim
20 words
The antenna as recited in claim 1, further including a substantially flat winding template for the drive and receive coils.
Claim 11
Dependent Claim
25 words
The antenna as recited in claim 9, wherein said template includes a substantaially U-shaped slot for receiving said first portion of said receive coil loop.
Claim 12
Dependent Claim
26 words
The antenna as recited in claim 9, wherein said receive coil is wound around said template and overlaping said first portion of said receive coil loop.
Claim 13
Dependent Claim
47 words
The antenna as recited in claim 9, wherein said receive coil comprises a plurality of loops of differing lengths in direction of the longitudinal axis of said antenna and said template includes an equal number of U-shaped slots, each slot receiving said first portion of one loop.
Claim 14
Dependent Claim
31 words
The antenna as recited in claim 9, wherein series of receive coils are provided side-by-side transversely across said template so as to allow simultaneous interrogation of multiple frequency markers in sequence.
Claim 15
Dependent Claim
29 words
The antenna as recited in claim 13, wherein a single drive coil is wound around said template and said first portion of each of said series of receive coils.
Claim 16
Dependent Claim
26 words
The antenna as recited in claim 9, wherein said template is composed of non-metallic magnetic material capable of providing a bias field for activating the marker.
Claim 17
Dependent Claim
23 words
The antenna as recited in claim 15, wherein said non-metallic magnetic material of the template is barium ferrite mixed with a plastic binder.
Claim 18
Dependent Claim
13 words
The antenna as recited in claim 16, wherein said plastic binder is polyethylene.
Claim 19
Dependent Claim
20 words
The antenna as recited in claim 17, wherein said template is substantially 20% barium ferrite and 80% plastic by volume.
Claim 20
Dependent Claim
49 words
The antenna as recited in claim 9, wherein said winding template defines the longitudinal axis of the antenna and includes a first end for retaining a second portion of said receive coil loop at a predetermined distance from said drive coil; said drive coil being wound around said template.
Claim 21
Dependent Claim
24 words
The antenna as recited in claim 19, wherein said first end includes a reduced section to retain the second portion of said receive coil.
Claim 22
Dependent Claim
24 words
The antenna as recited in claim 20, wherein said template includes a substantially U-shaped slot for receiving said first portion of said receive coil.
Claim 23
Dependent Claim
117 words
A dual antenna capable of energizing a correctly oriented, closely coupled marker providing an identifiably signal in response to an applied magnetic interrogation field and receiving the response, for utilization in card readers, product verification devices, or the like, comprising: a substantially flat elongated drive coil defining a longitudinal axis of the antenna; a receive coil having a plurality of loops of differing lengths in the direction of the longitudinal axis of the antenna to decrease the longitudinal position sensitivity of the antenna in relation to the marker, and a substantially flat plate adjacent said coils and forming a part of said antenna; said plate including magnetic material to provide a dc bias to activate said marker.
Claim 24
Dependent Claim
117 words
A dual antenna capable of energizing a correctly oriented, closely coupled marker providing an identifiably signal in response to an applied magnetic interrogation field and receiving the response, for utilization in card readers, product verification devices, or the like, comprising: a substantially flat elongated drive coil defining a longitudinal axis of the antenna; a receive coil having a plurality of loops of differing lengths in the direction of the longitudinal axis of the antenna to decrease the longitudinal position sensitivity of the antenna in relation to the marker, and a substantially flat plate adjacent said coils and forming a part of said antenna; said plate including magnetic material to provide a dc bias to activate said marker.
Claim 25
Dependent Claim
18 words
The antenna as recited in claim 22 wherein said plate forms a template for winding of said coils.
Claim 26
Dependent Claim
20 words
The antenna as recited in claim 22 wherein said plate is substantially 20% barrium ferrite and 80% plastic by volume.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-13 | 1990-10-13 | 1991-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-13 | 1994-10-13 | 1995-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-13 | 1998-10-13 | 1999-04-14 | $7700.00 | Window Closed / Lapsed |