Antenna core
First Claim
Patent Images
1. An antenna core at least 80 mm long with at least one flexible soft magnetic element of an amorphous or nanocrystalline alloy, wherein the amorphous and nanocrystalline alloy has a magnetostriction value λ
-
s in the range from 4·
10−
6 to −
4·
10−
6, wherein the antenna core, when wound with a wire to form a coil, has a linear B-H loop, and the inductance L of the antenna core at 60 kHz changes by less than 10% during bending of 25% of its length in the center.
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Abstract
A highly bendable antenna core (8) which is highly bendable for high-frequency identification systems substantially retains its soft-magnetic properties when bending occurs. The antenna core is produced by using specific amorphous or nanocrystalline alloys having a very low magnetostriction value. The antenna core (8) is embodied in the form of a laminate with/or without insulating layers placed therebetween. An antenna can be provided with one such antenna core.
33 Citations
24 Claims
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1. An antenna core at least 80 mm long with at least one flexible soft magnetic element of an amorphous or nanocrystalline alloy, wherein the amorphous and nanocrystalline alloy has a magnetostriction value λ
-
s in the range from 4·
10−
6 to −
4·
10−
6, wherein the antenna core, when wound with a wire to form a coil, has a linear B-H loop, and the inductance L of the antenna core at 60 kHz changes by less than 10% during bending of 25% of its length in the center. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
s in the range from 4·
-
10. A method for production of an antenna core comprising the steps of:
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winding one or more soft magnetic elements to a toroid, wherein the flexible soft magnetic element is made of an amorphous or nanocrystalline alloy and has a magnetostriction value λ
s in the range from 4·
10−
6 to −
4·
10−
6, and wherein the amorphous or nanocrystalline alloy has a linear B-H loop, and that the inductance L of the antenna core at 60 kHz changes by less than 10% during bending of 25% of its length in the center,separating the wound toroid at one site, folding back and reshaping it to an elongated antenna core. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A method for production of an antenna with an antenna core comprising the steps of:
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providing an antenna core at least 80 mm long with at least one flexible soft magnetic element made of an amorphous or nanocrystalline alloy having a magnetostriction value λ
s in the range from 4·
10−
6 to −
4·
10−
6, wherein the amorphous or nanocrystalline alloy has a linear B-H loop, and that the inductance L of the antenna core at 60 kHz changes by less than 10% during bending of 25% of its length in the center;stabilizing the elongated antenna core mechanically to a wound package; and providing the elongated antenna core with a winding.
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19. A method for production of an antenna with an antenna core being at least 80 mm long with at least one flexible soft magnetic element made of an amorphous or nanocrystalline alloy, wherein the amorphous and nanocrystalline alloy has a magnetostriction value λ
-
s in the range from 4·
10−
6 to −
4·
10−
6, wherein the soft magnetic elements are inserted into a frame made of a stable material and the provided with a winding, and that the antenna element so produced is covered with a shrinkage tube, at least in the region of the winding. - View Dependent Claims (20)
-
s in the range from 4·
-
21. A method for production of an antenna with an antenna core being at least 80 mm long with at least one flexible soft magnetic element made of an amorphous or nanocrystalline alloy, wherein the amorphous and nanocrystalline alloy has a magnetostriction value λ
-
s in the range from 4·
10−
6 to −
4·
10−
6, wherein the soft magnetic elements are inserted into a frame made of a stable material and then provided with a winding, and that the antenna element so produced, at least in the region of the winding, is covered with a shroud and glued, and that the ends of the antenna element are provided with a shrinkage tube for sealing, which is coated, especially on the inside, with an adhesive.
-
s in the range from 4·
-
22. A method comprising the steps of:
providing an antenna being at least 80 mm long with at least one flexible soft magnetic element made of an amorphous or nanocrystalline alloy, wherein the amorphous and nanocrystalline alloy has a magnetostriction value λ
s in the range from 4·
10−
6 to −
4·
10−
6, wherein the amorphous or nanocrystalline alloy has a linear B-H loop, and the inductance L of the antenna core at 60 kHz changes by less than 10% during bending of 25% of its length in the center, and using said antenna in a vehicle.- View Dependent Claims (23)
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24. A method comprising the steps of:
providing an antenna being at least 80 mm long with at least one flexible soft magnetic element made of an amorphous or nanocrystalline alloy, wherein the amorphous and nanocrystalline alloy has a magnetostriction value λ
s in the range from 4·
10−
6 to −
4·
10−
6, wherein the amorphous or nanocrystalline alloy has a linear B-H loop, and the inductance L of the antenna core at 60 kHz changes by less than 10% during bending of 25% of its length in the center, and using the antenna for personal recording and/or access systems.
Specification