Patent EP0645840A1 successfully refreshed from Google Patents.
EP0645840A1
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EP
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Antenna configuration of an electromagnetic detection system and an electromagnetic detection system comprising such antenna configuration
Assignee: Nederlandsche Apparatenfabriek NEDAP NV
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Filing: 1994-09-23
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Granted: —
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Expires: 2014-09-23
Abstract
Abstract Antenna configuration of an electromagnetic detection system for detecting and/or identifying detection labels, comprising a first and a second antenna array which in operation are connected with a transmitter and/or receiver of the detection system. The first antenna array comprises a plurality of current loops substantially located in one plane, which together enclose a surface which at least partly overlaps a surface enclosed by a current loop of the second antenna array. The second antenna array also comprises a plurality of current loops substantially located the plane referred to.
Inventors
- 👤 Paulus Rebers
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 15:27
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/10; G06K7/10009; G06K7/10316; G06K7/10346; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2402; G08B13/2465; G08B13/2468; G08B13/2474; H; H01; H01Q; H01Q7/00; H01Q7/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
90 words
An antenna configuration of an electromagnetic detection system for detecting and/or identifying detection labels, comprising a first and a second antenna array, which in operation are connected with a transmitter and/or receiver of the detection system and are located at least essentially and substantially in one plane, the first antenna array comprising a plurality of current loops together enclosing a surface at least partly overlapping a surface enclosed by a current loop of the second antenna array, characterized in that the second antenna array comprises a plurality of current loops.
Claim 2
Dependent Claim
23 words
An antenna configuration according to claim 1, characterized in that the second antenna array comprises more current loops than the first antenna array.
Claim 3
Dependent Claim
25 words
An antenna configuration according to claim 2, characterized in that the second antenna array comprises one more current loop than does the first antenna array.
Claim 4
Dependent Claim
44 words
An antenna configuration according to claim 1, 2, or 3, characterized in that each current loop of the second antenna array encloses a surface which coincides at least partly with at least one surface enclosed by a current loop of the first antenna array.
Claim 5
Dependent Claim
29 words
An antenna configuration according to any one of the preceding claims, characterized in that the first and second antenna arrays are at least substantially non-inductively coupled with each other.
Claim 6
Dependent Claim
36 words
An antenna configuration according to any one of the preceding claims, characterized in that the current loops in use have a current distribution such that far magnetic fields generated by the current loops compensate each other.
Claim 7
Dependent Claim
121 words
An antenna configuration according to any one of the preceding claims, characterized in that the first antenna array comprises at least a first and a second current loop, while in use through the first current loop a current flows with a rotative direction which is opposite to the rotative direction of a current flowing through the second current loop; and the second antenna array comprises at least a third, fourth and fifth current loop, the fourth current loop being located between the third and fifth current loops, and in use through the fourth current loop a current flows with a rotative direction which is opposite to the rotative direction of the currents flowing through the third and fifth current loops, respectively.
Claim 8
Dependent Claim
34 words
An antenna configuration according to claim 7, characterized in that the first and second current loops are located next to each other in the same direction as the third, fourth and fifth current loops.
Claim 9
Dependent Claim
47 words
An antenna configuration according to claim 8, characterized in that the surface enclosed by the fourth current loop coincides with at least a part of the surface enclosed by the first current loop and at least a part of the surface enclosed by the second current loop.
Claim 10
Dependent Claim
61 words
An antenna configuration according to claim 9, characterized in that the surface enclosed by the third current loop coincides at least substantially completely with a part of the surface enclosed by the first current loop, and the surface enclosed by the fifth current loop coincides at least substantially completely with a part of the surface enclosed by the second current loop.
Claim 11
Dependent Claim
41 words
An antenna configuration according to claim 10, characterized in that a dividing line located in said plane between the first and second current loops divides the surface enclosed by the fourth current loop in two at least substantially equally large parts.
Claim 12
Dependent Claim
42 words
An antenna configuration according to any one of the preceding claims 7-11, characterized in that the surface enclosed by the first and second current loops coincides at least substantially with the surface enclosed by the third, fourth and fifth current loops together.
Claim 13
Dependent Claim
96 words
An antenna configuration according to any one of the preceding claims 7-12, characterized in that the second antenna array is made up of a first O-shaped electrical conductor, which encloses the surface enclosed by the fourth current loop and whose free ends in use are connected with the transmitter and/or receiver, and a second electrically closed O-shaped electrical conductor, which encloses the sum of the surfaces enclosed by the third, fourth and fifth current loops, the two electrical conductors being inductively coupled with each other and in combination forming the third, fourth and fifth current loops.
Claim 14
Dependent Claim
95 words
An antenna configuration according to any one of the preceding claims 7-13, characterized in that the first antenna array is made up of a third O-shaped electrical conductor, which encloses the surface enclosed by the first current loop and whose free ends in use are connected with the transmitter and/or receiver, and a fourth electrically closed O-shaped conductor, which encloses the sum of the surfaces enclosed by the first and second current loops, the third and fourth electrical conductors being inductively coupled with each other and in combination forming the first and second current loops.
Claim 15
Dependent Claim
26 words
An antenna configuration according to claims 13 and 14, characterized in that the second and fourth electrically closed O-shaped conductors are one and the same conductor.
Claim 16
Dependent Claim
56 words
An antenna configuration according to claim 15, characterized in that the second and fourth electrical conductors consist at least partly of a hollow electrically conductive tube, the first and third electrical conductors being inductively coupled with the second and fourth electrical conductors, respectively, in that the first and third electrical conductors extend partly within the tube.
Claim 17
Dependent Claim
66 words
An electromagnetic detection system comprising a transmitter and receiver unit and an antenna configuration according to any one of the preceding claims coupled thereto, characterized in that the first and second antenna arrays are controlled, respectively, with first and second transmitted signals having a relative phase difference of 90°, so that an electromagnetic rotary field is generated at a plurality of positions in a detection zone.
Claim 18
Dependent Claim
57 words
An electromagnetic detection system comprising a transmitter and receiver unit and an antenna configuration according to any one of the preceding claims 1-16 coupled thereto, characterized in that one of the two antenna arrays is connected with the receiver unit of the system and the other antenna array is connected with the transmitter unit of the system.
References Cited (Backward Citations)
US4633250A
Cited
DE4027710A1
Cited
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