IP Library › Granted Patent US 12,738,403
Granted Patent B2
US 12,738,403 · App. 18/402,728 · Granted Sep 15, 2026

Methods and systems for magnetic shielded transmitter system

Inventor: Jørgen Selmer Jensen (Hjerm, DK)
H01F7/064G01D5/20H01F27/24H01F27/28
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Quick Facts
Patent No.
US 12,738,403
App. No.
18/402,728
Granted
Sep 15, 2026
Kind
B2
Abstract

In one aspect, a quadratic ferrite cube, wherein the quadratic ferrite cube comprises a hollow interior portion, wherein quadratic ferrite cube comprises a geometric shape that exhibits a same magnetic performance in an X direction, a Y direction, and a Z direction; a plurality of copper windings placed on an external portion of the quadratic ferrite cube; and a control and driving circuitry located inside the hollow interior portion, wherein the quadratic ferrite cube is used to generate a X, Y, Z magnetic field, and wherein the quadratic ferrite cube is used as a shielded room for a control and driving circuitry by generating the X, Y Z magnetic field in a range 20 KHz to 50 KHz for a magnetic based position system.

Claims (37)

1 . A magnetic shielded transmitter system, comprising:

a quadratic ferrite cube, wherein the quadratic ferrite cube comprises a hollow interior portion, wherein quadratic ferrite cube comprises a geometric shape that exhibits a same magnetic performance in an X direction, a Y direction, and a Z direction;

a plurality of copper windings placed on an external portion of the quadratic ferrite cube; and

a control and driving circuitry located inside the hollow interior portion,

wherein the quadratic ferrite cube is used to generate a X, Y, Z magnetic field,

wherein the quadratic ferrite cube is used as a shielded room for a control and driving circuitry by generating the X, Y Z magnetic field in a range 20 KHz to 50 KHz for a magnetic based position system, and

wherein a tile comprises a dimension measurement of 100 m*100 m*5.8 m[m3],and wherein each tile is measured to find μrel=600.

2 . The magnetic shielded transmitter system of claim 1 , wherein the plurality of copper windings are wound around the external surface of the quadratic ferrite cube.

3 . The magnetic shielded transmitter system of claim 2 further comprising:

an internal conductive chassis within the quadratic ferrite cube.

4 . The magnetic shielded transmitter system of claim 3 , wherein the hollow portion comprises a reduced magnetic field strength for safe placement of the control and driving circuitry.

5 . The magnetic shielded transmitter system of claim 4 , wherein the reduced magnetic field is configured for placement of a conductive shield with the hollow interior portion.

6 . The magnetic shielded transmitter system of claim 4 , wherein the conductive shield is used for fixing any ferrite elements and for fixing the control and driving circuitry.

7 . The magnetic shielded transmitter system of claim 5 ,

wherein a placement of a conductive chassis inside the quadratic ferrite cube reduce a residual magnetic field, and

wherein the quadratic ferrite cube is configured for a main part of the magnetic flux flow occurs in the ferrite.

8 . The magnetic shielded transmitter system of claim 7 , wherein the quadratic ferrite cube comprises six ( 6 ) tiles of the same size on each side, and wherein the. For example, the ferrite tiles can be fastened to a wood side of the quadratic ferrite cube by a glue adhesive.

9 . The magnetic shielded transmitter system of claim 8 , wherein the six tiles can be used to dampen high frequency waves in a radio anechoic chamber.

10 . The magnetic shielded transmitter system of claim 9 , wherein ferrite thickness is 3 mm.

11 . The magnetic shielded transmitter system of claim 10 , wherein structure is wound with twenty-three (23) windings d=1.4 m[m] stiff copper wire.

12 . The magnetic shielded transmitter system of claim 11 , wherein an inductance is measured to be L=220 μ[H].

13 . The magnetic shielded transmitter system of claim 12 , wherein a 200 n[F], high Q capacitor is connected in series to form a resonance.

14 . The magnetic shielded transmitter system of claim 13 , wherein power generator coupled with the stiff copper wire is adjusted such that the voltage across the 23 windings is 152 [V].

15 . The magnetic shielded transmitter system of claim 14 , wherein from this, the voltage across one winding of the stiff copper wire determined as 6.6 [V] corresponding to

d

⁢

Φ

dt

=

6.6

[

V

]

.

16 . The magnetic shielded transmitter system of claim 15 , wherein a placement of a conductive chassis is open for conducting a heat transfer from the driving electronics to the surface via the ferrite.

17 . The magnetic shielded transmitter system of claim 16 , wherein magnetic shielded transmitter system a solution with only one box instead of two boxes.

18 . The magnetic shielded transmitter system of claim 1 , wherein a ferrite thickness is 5.8 mm.

Continuity (1)
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References Cited (6)
US 3717876A · Volkers · 1973 [cited by examiner]
US 4021728A · Makino · 1977 [cited by examiner]
US 5258766A · Murdoch · 1993 [cited by examiner]
US 5315244A · Griebeler · 1994 [cited by examiner]
US 8618997B2 · Kato · 2013 [cited by examiner]
US 10903688B2 · Peralta · 2021 [cited by examiner]