ANTENNA CORE, ANTENNA, AND METHODS FOR PRODUCING AN ANTENNA CORE AND AN ANTENNA

• US 20130088401A1
• Filed: 01/28/2011
• Published: 04/11/2013
• Est. Priority Date: 01/29/2010
• Status: Active Grant

• Current Assignee: Vacuumschmelze GmbH & Company KG (Vectra Corp.)
• Original Assignee: Vacuumschmelze GmbH & Company KG (Vectra Corp.)
• Inventors: Binkofski, Johannes, Brunner, Markus, Trabold, Klemens, Koch, Ralf
• Granted Patent: US 9,099,767 B2
• Time in Patent Office: Days
• US Class Current: 343/787
• CPC Class Codes: H01F 1/15333 containing nanocrystallites, e.g. obtained by annealing
• CPC Class Codes: H01F 3/04 made from strips or ribbons
• CPC Class Codes: H01F 41/0226 from amorphous ribbons
• CPC Class Codes: H01F 41/077 Deforming the cross section or shape of the winding material while winding
• CPC Class Codes: H01Q 1/2216 used in interrogator/reader equipment
• CPC Class Codes: H01Q 7/06 with core of ferromagnetic material H01Q7/02 takes precedence
• CPC Class Codes: H01Q 7/08 Ferrite rod or like elongated core
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

The invention relates to an antenna core, an antenna comprising an antenna core, and to methods for producing an antenna core and an antenna. The antenna core used in each case consists of a continuous soft-magnetic strip having a plurality of layers which are stacked one on top of the other and each of which is formed by a section of the strip. The layers are connected to one another by curved sections of the strip at end regions of the antenna core.

Claims

1. An antenna core, comprising:

an elongated shape having a plurality of layers of a through strip comprising a soft-magnetic alloy with an amorphous or nanocrystalline structure

two end areas disposed some distance apart at either end of the elongated shape, comprising curved sections of the through strip,

wherein each of the plurality of layers is connected in at least one of the end areas by a curved section of the through strip to another of the plurality of layers, and

wherein the curved section connecting these two layers is integral with these two layers.

2. The antenna core according to claim 1, wherein the plurality of layers form a layer stack, wherein, except for a top layer of the plurality of layers and except for a bottom layer of the plurality of layers, each of the plurality of layers is arranged between two other layers of the plurality of layers, and wherein a distance between a layer and each of these two other layers is smaller than a thickness (d2) of the through strip.

3. The antenna core according to claim 1, wherein at least one of the curved sections has a curvature radius (r23) that is smaller than ten-times a thickness (d2) of the through strip.

4. The antenna core according to claim 3, wherein at least one of the curved sections has a curvature radius (r23) that is smaller than five-times a thickness (d2) of the through strip.

5. The antenna core according to claim 1, wherein each of the curved sections has a curvature radius (r23) that is smaller than five-times a stack height (h24) of the through strip.

6. The antenna core according to claim 5, wherein each of the curved sections has a curvature radius (r23) that is smaller than two-times the stack height (h24) of the through strip.

7. The antenna core according to claim 6, wherein each of the curved sections has a curvature radius (r23) that is smaller than the stack height (h24) of the through strip.

8. The antenna core according to claim 1, wherein the through strip has a thickness of 10 μ

m to 30 μ

m.

9. The antenna core according to claim 1, wherein the through strip contains or consists of an alloy having the composition

Fe_aX_bSi_cB_d

wherein a, b, c and d are indicated in at. %;

wherein X consists of cobalt, or nickel, or a mixture of cobalt and nickel, and wherein the following applies;

0≦

b≦

45;

6.5≦

c≦

18;

4≦

d≦

14;

c+d>

16; and

a+b+c+d−

100, and typical contaminants.

10. The antenna core according to claim 1, wherein the through strip contains or consists of an alloy having the composition

Fe_aX_bCu_cSi_dB_eM_fZ_g

wherein M is at least one of the elements V, Nb, Ta, Ti, Mo, W, Zr and Hf;

wherein Z is at least one of the elements P, Ge and C;

wherein X is cobalt, or nickel, or else a mixture of cobalt and nickel;

wherein a, b, c, d, e, f and g are indicated in at. %; and

wherein the following applies;

0≦

b≦

45;

0.5≦

c≦

2;

6.5≦

d≦

18;

5≦

e≦

14;

1≦

f≦

6;

d+e>

16;

g<

5; and

a+b+c+d+e+f+g=100, and typical contaminants.

11. The antenna core according to claim 1, wherein the through strip contains or consists of an alloy having the composition

Co_a(Fe₁₋

xMn_x)_bNi_cX_dSi_eB_fC_g

wherein X comprises at least one of the elements from the group V, Nb, Ta, Cr, Mo, W Ge and P, and wherein a, b, c, d, e, f, and g are indicated in at. %; and

wherein the following applies;

40<

a<

82;

2<

b<

10;

0<

c<

30;

0<

d<

5;

0<

e<

15;

7<

f<

26;

0<

g<

3;

15<

d+e+f+g<

30; and

0<

x<

1, and typical contaminants.

12. The antenna core according to claim 1, further comprising a constriction between the two end areas.

13. The antenna core according claim 1, having a length of at least 150 mm or at least 200 mm.

14. A method for the production of an antenna core according to claim 1 comprising:

preparing a through strip, comprising a soft-magnetic alloy with an amorphous or nanocrystalline structure;

winding the through strip around to form a winding body with multiple windings, including an innermost winding having two sections of the through strip that are opposite one another;

flattening the winding body, so that the two sections of the innermost winding come to rest against one another.

15. The method according to claim 14, wherein flattening the winding body comprises reducing the distance between the two sections of the innermost winding is smaller than the thickness (d2)—

of the through strip.

16. The method according to claim 14, wherein flattening the winding body is carried out by means of two metal plates, whose length is smaller than the length (L10) of the antenna core after flattening such that the finished antenna core is constricted between two end areas.

17. The method according to claim 14, further comprising heat treating the winding body before and/or after flattening in a temperature range of 350°

C. to 600°

C.

18. An antenna comprising an antenna core according to claim 1, and an electrical coil, in which the antenna core is arranged.

19. The antenna according to claim 18, whose quality is less than 32.

20. A method for the production of an antenna comprising:

preparing an antenna core, claim 14;

wrapping the antenna core with a wire to product an electrical coil.