EP2089890A1 - Optimised solenoid winding - Google Patents
Optimised solenoid windingInfo
- Publication number
- EP2089890A1 EP2089890A1 EP07870362A EP07870362A EP2089890A1 EP 2089890 A1 EP2089890 A1 EP 2089890A1 EP 07870362 A EP07870362 A EP 07870362A EP 07870362 A EP07870362 A EP 07870362A EP 2089890 A1 EP2089890 A1 EP 2089890A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- turns
- mag
- turn
- variable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004804 winding Methods 0.000 title claims abstract description 124
- 230000005291 magnetic effect Effects 0.000 claims abstract description 71
- SVTBMSDMJJWYQN-UHFFFAOYSA-N 2-methylpentane-2,4-diol Chemical compound CC(O)CC(C)(C)O SVTBMSDMJJWYQN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 230000001939 inductive effect Effects 0.000 claims abstract description 13
- 230000000694 effects Effects 0.000 description 19
- 238000000034 method Methods 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 7
- 239000000696 magnetic material Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 230000004907 flux Effects 0.000 description 6
- 238000005457 optimization Methods 0.000 description 6
- IXEVGHXRXDBAOB-GBIKHYSHSA-N [(1r,3s,4s)-4,7,7-trimethyl-3-bicyclo[2.2.1]heptanyl] 2-thiocyanatoacetate Chemical compound C1C[C@]2(C)[C@@H](OC(=O)CSC#N)C[C@@H]1C2(C)C IXEVGHXRXDBAOB-GBIKHYSHSA-N 0.000 description 4
- 230000005294 ferromagnetic effect Effects 0.000 description 4
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- 238000011835 investigation Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
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- RXACEEPNTRHYBQ-UHFFFAOYSA-N 2-[[2-[[2-[(2-sulfanylacetyl)amino]acetyl]amino]acetyl]amino]acetic acid Chemical compound OC(=O)CNC(=O)CNC(=O)CNC(=O)CS RXACEEPNTRHYBQ-UHFFFAOYSA-N 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005530 etching Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000001459 lithography Methods 0.000 description 2
- MGIUUAHJVPPFEV-ABXDCCGRSA-N magainin ii Chemical compound C([C@H](NC(=O)[C@H](CCCCN)NC(=O)CNC(=O)[C@@H](NC(=O)CN)[C@@H](C)CC)C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N[C@@H](CO)C(=O)N[C@@H](C)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CCCCN)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)NCC(=O)N[C@@H](CCCCN)C(=O)N[C@@H](C)C(=O)N[C@@H](CC=1C=CC=CC=1)C(=O)N[C@@H](C(C)C)C(=O)NCC(=O)N[C@@H](CCC(O)=O)C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CCSC)C(=O)N[C@@H](CC(N)=O)C(=O)N[C@@H](CO)C(O)=O)C1=CC=CC=C1 MGIUUAHJVPPFEV-ABXDCCGRSA-N 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000002547 anomalous effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
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- 230000005389 magnetism Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F17/0033—Printed inductances with the coil helically wound around a magnetic core
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F17/00—Fixed inductances of the signal type
- H01F17/0006—Printed inductances
- H01F2017/0073—Printed inductances with a special conductive pattern, e.g. flat spiral
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
Definitions
- An inductive microdevice having a rectilinear solenoid winding having a plurality of disjointed rectangular turns, each having predetermined dimensions.
- the invention applies in particular to all inductive systems integrated or not, of the inductor type, transformer, magnetic recording head, actuators, sensors, etc., requiring low losses or a very homogeneous magnetic flux density.
- the invention applies more particularly to integrated micro-inductors.
- a conventional solenoid winding has the advantage of having a periodic structure, which naturally limits the effects of proximity. However, at the edges of the solenoid, proximity effects remain very important.
- the magnetic flux can be quite inhomogeneous, which can cause problems in the presence of magnetic material.
- FIG. 1 illustrates an integrated inductor 1 with a spiral-shaped winding 2a comprising four magnetic elements 2b, for example trapezium-shaped, disposed above the winding 2a, as described in particular in FIG. article "Bidirectional Ferromagnetic Spiral Inductors Using Single Deposition" by B. Viala et al. (IEEE Trans Magnetics, Vol 41, No. 10, pp. 3544-3549, October 2005) and in the article “Dual spiral sandwiched magnetic thin film inductor using Fe-Hf-N soft magnetic films as a magnetic core” from KH Kim et al. (Journal of Magnetism and Magnetic Materials 239, 2002, 579-581).
- This type of inductor 1 namely with a planar spiral winding with magnetic planes, is the most commonly used in microelectronics, because it is particularly easily integrable.
- an inductance 3 in the form of a planar spiral 4, with a variable turn width, as shown in FIG. 2.
- the reduction of the width, in particular of internal turns of spiral 4 leads to the limitation of their contributions to losses.
- this also leads to increase in the width of the outer turns, in order to keep about the same static resistance (“Direct Current” or DC), as described in particular in the article “Investigation of Proximity Effects in Ferromagnetic Inductors with Different Topologies: modeling and solutions "of AS. Royet, et al. (Transcript of the Magnetic Society of Japan, Vol 5, No. 4, November 2005).
- the magnetic field remains very inhomogeneous, which limits the quality factor of the inductor.
- FIGS. 3a and 3b another form of inductance 5 in the form of a planar spiral 6a has been proposed, with the spiral 6a formed of a plurality of lamellae 6b, for example three lamellae 6b in FIG. 3b, to limit the induced current loops, as described in particular in the article "Investigation of Proximity Effects in Ferromagnetic Inductors with Different Topologies: modeling and solutions" of AS. Royet, et al. (Transcript of the Magnetic Society of Japan, Vol 5, No. 4, November 2005).
- the winding capacitance is high, the current loops are only slightly attenuated and the quality factor gains are also relatively low.
- FIG. 4 another type of inductor 7 is represented, with a plurality of linear solenoid windings 8, arranged parallel to one another, as described in particular in the article "A FuIIy Integrated Planar Toroidal Inductor with a Micromachined Nickel-lron Magnetic Bar "by Chong H. Ahn et al. (IEEE Trans., Packaging and Manufacturing Technology - Part A, Vol 17, No 3, September 1994).
- the effects of proximities are less important because, for the turns 9 at the heart of the solenoid 8, the magnetic fields created by their neighbors compensate to a large extent. However, for the turns 9 at the edge of the solenoid 8, there is no compensation.
- the solenoid winding 10 conventionally comprises a plurality of rectangular turns 11 (FIG. 5c) disjoint, that is to say non-adjacent to each other but forming one and the same coil, as represented by the dashed lines in FIG. 5a.
- the turns 11 are each defined by the following geometric parameters: the width W BOB (FIG. 5b), the length L- BOB (FIG. 5b), the thickness E B0B (FIG. 5a) and the height of the turn ISOL (FIG. 5c).
- the turn height is called ISOL, because it corresponds in particular to the distance between the upper part and the lower part of the winding defining the insulation of the winding.
- the winding 10 is also defined by the interval INT between two adjacent turns 11 (FIG. 5a) and by the number of turns N of the winding 10.
- the winding 10 is associated with a magnetic core 12
- the following geometric parameters are also to be considered: the thickness E MAG (FIG. 5a), the length L MAG and the width W MAG (FIG. 5b) of the magnetic core 12.
- the aim of the invention is to remedy all of the aforementioned drawbacks and to provide an inductive microdevice having solenoid-type winding, which is easy to implement and which can be used for any type of application. which makes it possible to reduce the effects of proximity, to reduce the high frequency losses and to obtain a homogeneous magnetic flux all along the solenoid winding.
- this object is achieved by the appended claims and, more particularly, by the fact that at least one of the dimensions of the turns is variable and determined individually for each turn as a function of its position along the winding and characteristics. predetermined magnets of the winding.
- FIG. 1 schematically represents a particular embodiment of an inductance with a planar spiral winding, with magnetic planes, according to the prior art.
- Figures 2, 3a and 3b schematically show other types of inductors with a planar spiral winding according to the prior art.
- FIG. 4 schematically represents a particular embodiment of an inductance with a rectilinear solenoid winding according to the prior art.
- FIGS. 5a to 5c show, respectively, a front view in longitudinal section, a top view and a cross-sectional side view of a particular embodiment of a rectilinear solenoid winding with a rectangular cross section according to the art. prior.
- FIGS. 6a and 6b show, respectively, a front view in longitudinal section and a view from above of a particular embodiment of a rectilinear solenoid winding with a rectangular cross-section according to the invention.
- FIGS. 7a to 7c very schematically represent alternative embodiments of the solenoid winding according to FIGS. 6a and 6b.
- FIG. 8 is a graph giving the standard deviation of the magnetic field along the longitudinal axis of the solenoid winding, whose winding width varies according to a geometric progression, as a function of the reason for this geometric progression.
- FIGS. 9a and 9b are graphs showing a top view of the shape of the winding of certain points of the graph according to FIG. 8.
- FIG. 10 is a graph representing the normalized quality factor of a winding, whose width of the turns and the length of the turns both vary according to a geometric progression of respective reasons QW and
- the inductive microdevice comprises a solenoid winding and more specifically a solenoid microbobinage.
- the rectilinear solenoidal winding 13 of rectangular cross-section (FIG. 6a) preferably comprises a plurality of disjoint and rectangular turns 14.
- the turns 14 of the winding 13 are rectangular, that is to say that each turn has, seen in profile, a substantially rectangular shape defining two upper and lower horizontal branches and two lateral branches connecting the upper and lower branches ( Figure 5c) .
- Two successive turns 14 are non-adjacent and all the turns 14 of the winding 13 form a single coil, as represented by dashed lines in FIG. 6a.
- Each turn 14 has, more particularly, a rectangular cross-section (FIG. 6a) and each turn 14 of the winding 13 is then defined as previously by predetermined dimensions, namely the width W BOBl the length L B0B) the thickness E B0B and the ISOL turn height.
- the rectilinear solenoid winding 13 comprises, in FIGS. 6a and 6b, five rectangular disjoint turns 14 having, respectively, a width W B0B 1 to W BOB 5 (FIG. 6b), a length L B0B 1 to L BOB 5 (FIG. 6b), a thickness E B0B 1 to E 608 5 (FIG. 6a) and a turn height ISOL 1 to ISOL 5 (FIG. 6a), all of different values.
- the coil 13 also has a different INT interval between two adjacent and successive turns 14, namely INT 1 to INT 4 .
- the winding 13 is associated with a magnetic core 15, shaped as a bar having different sections associated with each turn 14 of the solenoid winding 13.
- each turn 14 vary according to the position of the turn 14 along the solenoid winding 13 and are determined individually for each turn 14, in particular according to predetermined magnetic characteristics of the coil 13, for example if a homogeneous magnetic field is sought or if an optimum quality factor must be obtained.
- the widths W BOB 1 to W BOB 5 are all different from each other, with the width W B0B 5 of the fifth upper turn with width W B0B 1 of the first turn, itself greater than width W BOB 3 of the third turn, itself greater than the width W B0B 2 of the second turn, itself greater than the width W BOB 4 of the fourth turn.
- the lengths are also all different from each other, with L B0B 3 greater than L B0B 4 , itself greater than L B0B 1 , itself greater than L 6OB 2 , itself greater than L 608 5 .
- the thicknesses are also different from each other, with E B0B 5 greater than E B0B 2 , itself greater than E B0B 3 , itself greater than E BOB 1 , itself greater than E BOB 4 .
- the turn height is also different for each turn, with ISOL 3 greater than ISOL 1 , itself greater than ISOL 2 , itself greater than ISOL 4 , itself greater than ISOL 5 .
- the magnetic core 15 therefore comprises five different sections, each associated with a turn 14 of the winding 13.
- the sections are defined by their width W MAG , their length L MAG and their thickness E MAG .
- the sections are, for example, substantially flat and are connected by cross sectional areas, for example, substantially trapezoidal.
- the dimensions of the sections of the core 15 vary along the winding 13, with, for example, the thickness E MAG 3 of the third section greater than the thickness E MAG 4 of the fourth section. even higher than the thickness E MAG 5 of the fifth section, itself greater than the thickness E MAG 2 of the second section, itself greater than the thickness E MAG 1 of the first section (FIG. 6a) .
- the width W MAG 3 of the third section is greater than the width W MAG 4 of the _
- the variation of the dimensions of the magnetic core 15 associated with the solenoid winding 13 is determined as a function of the dimensions of the associated turns 14 or independently as a function of the position of the sections of the magnetic core 15 along the solenoid winding 13 and as a function of the desired magnetic characteristics of the solenoid winding 13.
- the solenoid winding 13 according to the invention thus makes it possible to obtain a maximum quality factor or a substantially homogeneous magnetic field, in particular by reducing proximity effects, and thus proposes a generic design solution for any type of inductive component with or without magnetic core.
- the solenoid winding 13 comprises five disjointed rectangular turns 14 having dimensions varying, for example, gradually and, preferably, symmetrically along the winding 13.
- the turns being oriented perpendicular to the reference longitudinal axis AA winding 13, the dimensions of the turns 14 vary symmetrically with respect to the central turn of the winding 13.
- Such a configuration allows in particular to make the magnetic field more homogeneous at the ends of the winding 13.
- the solenoid winding 13 comprises five turns 14 of the same length L 303 and, preferably, of identical thickness E B0B , in particular because of the technological constraints considered. It is therefore the width W BOB of the turns 14 which varies along the solenoid winding 13, along the reference axis AA, with the width W B0B 3 of the central turn 14 greater than the width of the other turns 14, in particular according to the position of the turn 14 and the desired magnetic characteristics of the solenoid winding 13.
- the alternative embodiment of the solenoid winding 13 differs from the solenoid winding 13 shown in FIG. 7a by the variable predetermined size of the turns 14.
- it is the thickness E BOB of the turns 14 which is variable, preferably symmetrically, with the thickness E BOB 3 of the central turn 14 greater than the thickness of the other turns 14, in particular according to the position of the turn 14 and the desired magnetic characteristics of the coil 13.
- the length L B0B and the width W 608 of the turns 14 are then preferably identical for all the turns 14 of the winding 13.
- the alternative embodiment of the solenoid winding 13 differs from the solenoid windings 13 shown in FIGS. 7a and 7b by the predetermined dimension which varies along the winding.
- it is the length L B0B of the turns 14 which varies, preferably symmetrically, with the length L B0B 3 of the central turn 14 greater than the length of the other turns 14, in particular according to the position of the turn 14 and the desired magnetic characteristics of the winding 13.
- the width W B0B and the thickness E 606 of the turns 14 are then preferably identical for all the turns 14 of the winding 13.
- the value of the interval INT between two adjacent turns 14 of the winding 13 is constant (FIG. 7a) and the height of the ISOL turn is also constant for all the turns. 14 of the winding 13 ( Figure 7b).
- the values of intervals INT and of ISOL turn height can vary independently along the solenoid winding 13, depending on the position of the turns 14 and the desired magnetic characteristics of the winding 13.
- the winding 13 may optionally be associated with a magnetic core (not shown) having predetermined dimensions that can also be varied as previously described in an advantageously symmetrical manner.
- E MAG In general, to simplify the calculations, we will consider E MAG .
- W MAG in the case where the coil is associated with a magnetic core
- ISOL ISOL
- INT E 808 constant.
- the optimal compromise for determining the shape of the turns depends on complex phenomena, in particular induced currents, capacitive effects, non-linearity and the non-homogeneity of the magnetic material forming the magnetic core, and the working frequency. It is therefore necessary to use optimization algorithms, possibly coupled with analytical or numerical design models.
- INT, E BOB and ISOL are fixed by technological realization constraints, for example, at 10 .mu.m, 5 .mu.m and 40 .mu.m, respectively.
- INT is set at 10 ⁇ m.
- - ISOL is set at 40 ⁇ m.
- a method for quickly calculating the quality factor is preferably used.
- the Kuhn method as described in the article "Analysis of current crowding effects in multiturn spiral inductors" by W. B. Kuhn et al. (IEEE Trans., Microwave Theory and Techniques, Vol 49, No. 1, pp. 31-38, January 2001), calculates losses by proximity effects.
- the inductive field can be calculated by the law of Biot and Savart. Losses by skin effect can be calculated using Press's two-dimensional approach, as described in particular in his article “Resistance and reactance of massed rectangular conductor” (Phys Review, Vol VIII, No. 4, p 417 , 1916), the capacitive effects being neglected and the inductance being calculated from the numerical calculation of the magnetic flux.
- the best quality factor namely the one closest to 1, is obtained for a value of the reason QL of 0.7 and for a value of the reason QW of 0, 6, that is to say corresponding to a symmetrical rectilinear solenoid winding, whose turns evolve from the ends to the center, in width in a geometric progression of reason 0.6 and in length in a geometric progression of reason 0 7.
- the solenoid winding according to the invention applies more particularly, without limitation of frequency or power, to all inductive systems provided with a solenoid winding with or without a magnetic core, namely: inductors and transformers, power heads magnetic recording for data storage, - inductive sensors, such as fluxgates or permeameters, inductive motors and actuators, the field-generating coils.
- such a solenoid winding has the dual advantage of generating more homogeneous fields and of being less sensitive to proximity effects.
- Such a winding therefore allows finer measurements of the response of the magnetic materials as a function of the frequency and of the magnetic field by the perturbation method.
- An example of a method for producing a solenoid winding using a "microsystems" technology may comprise the following steps.
- a first deposit of a conductive material is made to form the lower part of the winding, for example by a damascene electrolysis process.
- a first insulating material is deposited.
- One or more deposits of magnetic materials are then made for the formation of a magnetic core. Then, one or more steps of lithography and etching of the core are performed.
- a second deposit of insulating material is then performed, and steps of lithography and vias etching in the two layers of insulation are realized, in order to be able to close the turns of the winding. Finally, a second deposit of conductive material is made to form the upper part of the winding.
- Such a method of realization of the "microsystems" type makes it possible in particular to obtain a solenoid winding in a fast and easy manner, with great freedom on the choice of the dimensions of the turns, in particular the length L BOB , the width W BOB , and the INT spacing between the turns, which is much more difficult to obtain with a micromechanical type process, that is to say based on the winding of a wire.
- the invention is not limited to the various embodiments described above.
- the solenoid winding according to the invention may comprise any number of turns, as long as they have at least one variable dimension along the winding, as a function of the position of the turn along the winding and the magnetic stresses sought for the winding.
- the turns with the largest dimensions are advantageously placed in the center of the winding.
- the lower part of the solenoid coil may, for example, not have the same thickness as the upper part and the solenoid winding may, for example, not be symmetrical. In these cases, the number of parameters to be taken into account will be much larger. It will be the same if the magnetic core in the heart of the solenoid is not centered with respect to the latter.
- DC static resistance
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Coils Or Transformers For Communication (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0610521A FR2909482A1 (en) | 2006-12-01 | 2006-12-01 | Rectilinear solenoid winding for e.g. permeameter, has turns, whose one of dimensions is variable and determined individually with respect to position of turns along winding and predetermined magnetic characteristic of winding |
PCT/FR2007/001967 WO2008071886A1 (en) | 2006-12-01 | 2007-11-30 | Optimised solenoid winding |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2089890A1 true EP2089890A1 (en) | 2009-08-19 |
Family
ID=38310020
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07870362A Withdrawn EP2089890A1 (en) | 2006-12-01 | 2007-11-30 | Optimised solenoid winding |
Country Status (5)
Country | Link |
---|---|
US (1) | US20100066472A1 (en) |
EP (1) | EP2089890A1 (en) |
JP (1) | JP2010511301A (en) |
FR (1) | FR2909482A1 (en) |
WO (1) | WO2008071886A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6787211B2 (en) * | 2017-03-24 | 2020-11-18 | トヨタ自動車株式会社 | Filament winding device |
WO2021100424A1 (en) * | 2019-11-22 | 2021-05-27 | 株式会社村田製作所 | Laminated coil component |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2574980B1 (en) * | 1984-12-14 | 1987-01-16 | Thomson Cgr | SOLENOIDAL MAGNET WITH HOMOGENEOUS MAGNETIC FIELD |
US5576680A (en) * | 1994-03-01 | 1996-11-19 | Amer-Soi | Structure and fabrication process of inductors on semiconductor chip |
US5798679A (en) * | 1995-06-07 | 1998-08-25 | Houston Advanced Research Center | Magnetic flux bending devices |
FR2771843B1 (en) * | 1997-11-28 | 2000-02-11 | Sgs Thomson Microelectronics | INTEGRATED CIRCUIT TRANSFORMER |
US6417754B1 (en) * | 1997-12-08 | 2002-07-09 | The Regents Of The University Of California | Three-dimensional coil inductor |
US6535098B1 (en) * | 2000-03-06 | 2003-03-18 | Chartered Semiconductor Manufacturing Ltd. | Integrated helix coil inductor on silicon |
US6614093B2 (en) * | 2001-12-11 | 2003-09-02 | Lsi Logic Corporation | Integrated inductor in semiconductor manufacturing |
US6645161B2 (en) * | 2001-12-12 | 2003-11-11 | Kimberly-Clark Worldwide, Inc. | Method, apparatus and simulated human tissue for evaluating coefficients of friction of materials on human skin |
JP2004200227A (en) * | 2002-12-16 | 2004-07-15 | Alps Electric Co Ltd | Printed inductor |
US7280016B2 (en) * | 2003-02-27 | 2007-10-09 | University Of Washington | Design of membrane actuator based on ferromagnetic shape memory alloy composite for synthetic jet actuator |
US7088215B1 (en) * | 2005-02-07 | 2006-08-08 | Northrop Grumman Corporation | Embedded duo-planar printed inductor |
US7202836B2 (en) * | 2005-05-06 | 2007-04-10 | Motorola, Inc. | Antenna apparatus and method of forming same |
-
2006
- 2006-12-01 FR FR0610521A patent/FR2909482A1/en not_active Withdrawn
-
2007
- 2007-11-30 US US12/312,422 patent/US20100066472A1/en not_active Abandoned
- 2007-11-30 JP JP2009538747A patent/JP2010511301A/en active Pending
- 2007-11-30 EP EP07870362A patent/EP2089890A1/en not_active Withdrawn
- 2007-11-30 WO PCT/FR2007/001967 patent/WO2008071886A1/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2008071886A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2008071886A1 (en) | 2008-06-19 |
US20100066472A1 (en) | 2010-03-18 |
JP2010511301A (en) | 2010-04-08 |
FR2909482A1 (en) | 2008-06-06 |
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