EP3781960A1 - Spule sowie einrichtung zur drahtlosen signalübertragung sowie ein verfahren zur herstellung einer derartigen spule - Google Patents
Spule sowie einrichtung zur drahtlosen signalübertragung sowie ein verfahren zur herstellung einer derartigen spuleInfo
- Publication number
- EP3781960A1 EP3781960A1 EP19719459.0A EP19719459A EP3781960A1 EP 3781960 A1 EP3781960 A1 EP 3781960A1 EP 19719459 A EP19719459 A EP 19719459A EP 3781960 A1 EP3781960 A1 EP 3781960A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil
- conductor tracks
- impedance
- wireless signal
- signal transmission
- 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- Withdrawn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
- 230000008054 signal transmission Effects 0.000 title claims abstract description 27
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 5
- 239000004020 conductor Substances 0.000 claims abstract description 51
- 238000004904 shortening Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 239000003990 capacitor Substances 0.000 description 23
- 238000003325 tomography Methods 0.000 description 7
- 230000005540 biological transmission Effects 0.000 description 6
- 230000006978 adaptation Effects 0.000 description 3
- 238000005481 NMR spectroscopy Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/36—Electrical details, e.g. matching or coupling of the coil to the receiver
- G01R33/3628—Tuning/matching of the transmit/receive coil
-
- 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
- H01F17/0013—Printed inductances with stacked layers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/341—Constructional details, e.g. resonators, specially adapted to MR comprising surface coils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
- H01F2038/143—Inductive couplings for signals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
- H01F2038/146—Inductive couplings in combination with capacitive coupling
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
Definitions
- the invention relates to a coil in the form of a transmitting and / or receiving coil of a device for wireless signal transmission, e.g. by means of electromagnetic waves, or for wireless signal reception, the coil having an impedance matching circuit for adapting the connection impedance of the coil to an input impedance of a signal transmitting and / or receiving device of the device for wireless signal transmission to be connected to the coil having.
- the invention also relates to a device for wireless signal transmission or for wireless signal reception, comprising a signal transmission and / or reception device and a coil connected to the signal transmission and / or reception device.
- the invention also relates to a method for producing such a coil.
- Such devices for wireless signal transmission can be found in various fields of technology.
- the field of magnetic resonance tomography MRI
- strong magnetic fields are radiated by means of such a coil and the resulting effects of a person to be examined are received again by such a coil.
- Other fields of application of such coils can be found, for example, in energy harvesting or in the transmission of RFID signals.
- a wireless signal transmission here is a signal transmission in the broadest sense understood, ie any transmission of signals, even if they are not evaluated, any receiving signals and any transmission of signals between a transmitter and a receiver. In the field of magnetic resonance tomography, such transmission and reception but no direct signal transmission takes place between these transmitting and receiving coils.
- the transmitting coil uses a quantum mechanical effect, which leads to the generation of an externally effective magnetization. This occurs when a spin ensemble is exposed to a strong static magnetic field and high-frequency alternating field at the so-called Larmor frequency.
- the high-frequency alternating field is generated by the transmitting coil.
- the receiving coil can pick up the induced signal by the time-varying magnetization.
- the coil according to the invention is therefore particularly suitable for signal reception of the induced signal.
- the invention is therefore based on the issue to realize the necessary impedance adjustment without the aforementioned disadvantages.
- the impedance matching circuit is formed entirely or at least partially by at least partially overlapping conductor tracks of the coil.
- the coil may be formed, for example, as a conductor loop.
- the invention has the advantage that an impedance matching can be realized with little effort, by the flexibility and reliability of the coil and the entire arrangement thus formed is not affected.
- a complete impedance matching can be realized by the mutually at least partially overlapping conductor tracks, so that no further components are required for the realization of the impedance matching circuit.
- each conductor loop has an intrinsic resonance and can thus be understood as a resonant circuit.
- the coil can thus be adapted in such a way that the function of the parallel-connected capacitor is replaced by the intrinsic resonance.
- the adaptation of the resonance behavior by using the intrinsic resonance is subject to external restrictions in some cases, such as e.g. a desired diameter of the coil that may not allow complete matching of the resonance behavior at the desired operating frequency. Therefore, at least a partial adaptation can be carried out by the inherent resonance of the conductor tracks, the complete adaptation can be done by adding, for example, a series-connected capacitor.
- a distributed capacitance is introduced by the partial overlapping of the conductor tracks, wherein the intrinsic capacitance can be changed by lengthening or shortening the conductor tracks, in order in this way to realize the desired impedance matching on the coil side. If the tracks of the coil are overlapped, These form a capacity, and the resonance of the system conductor loop can be varied at fixed diameters.
- connection lines of the coil which serve to connect the coil to the signal transmitting and / or receiving device, outside the overlapping region of the overlapping conductor tracks of the coil are connected to the conductor tracks of the coil.
- the connecting leads of the coil can be made neutral in this regard, e.g. in the form of a cable designed with the terminal impedance of the coil, e.g. a coaxial cable.
- the conductor tracks of the coil which may also be referred to as printed conductors, may, for example, have a circular cross-sectional shape.
- the overlap region extends over an angular range which is not a multiple of 360 degrees.
- the overlap area may differ by at least +15 degrees / -15 degrees from a multiple of 360 degrees.
- the angles refer to a circle of 360 degrees (360 °).
- the Lei ter shoes the coil at least partially or completely have a flattened cross-sectional shape.
- the cross-sectional shape can for example be substantially rectangular, wherein the corners of the rectangular shape can also be rounded.
- the cross-sectional shape may have a height-to-width ratio of less than 1: 3 or less than 1: 5. In this way, the overlap area between the conductor tracks of the coil can be optimized with regard to the intrinsic capacitance formed thereby.
- the Lei ter shoes the coil at least partially or completely from flexible Porterplattenma- are formed. This allows a simple and inexpensive provision of such a coil with sufficient flexibility.
- the coil is thus suitable, for example, for applications in medical technology, eg for magnetic resonance tomography.
- the coil is designed as an air-core coil. Accordingly, the coil is formed without a core.
- the coil may e.g. have an inner diameter which is at least 10 times as large as the width of the conductor tracks of the coil.
- a device for wireless signal transmission or for wireless signal reception comprising a signal transmission and / or reception device and a coil connected to the signal transmission and / or reception device, the device being characterized by a decoupling circuit and a connecting line is coupled to the coil.
- the coil can be designed as a coil of the previously described type whose connection impedance is completely or partially matched to the input impedance of the signal transmitting and / or receiving device by means of the conductor tracks which at least partially overlap one another. This also allows the advantages explained above to be realized.
- the decoupling circuit is designed as an active decoupling circuit, by which the coil is operated outside of its intrinsic resonance during operation as a transmitting coil.
- the active decoupling circuit has a diode, for example, has a PIN diode.
- the diode can in particular be arranged on the output side of the decoupling circuit This means that it can be connected upstream of the downstream signal transmission and / or reception device.
- the diode can be connected directly to the downstream signal transmitting and / or receiving device, or indirectly via at least one further component, for example via a capacitor connected in series.
- the diode in its conductive state, short-circuits an upstream filter, thereby neutralizing the circuit from the connected connection line to the coil, which may be a 1/2-connection line. In the off state, the diode acts as a capacitor, whereby the filter scarf performs the function of a phase shifter.
- the filter circuit may e.g. as a 1/4 filter, e.g. as Collins filter.
- the diode is connected via the capacitor connected in series with the signal transmitting and / or receiving device, then as an additional development of the invention, an independent tuning of the two states is possible, which can be caused by the diode (diode in the conducting state / diode in Blocking state).
- the device is coupled to the coil by the active decoupling circuit and a connecting line (eg connecting cable), wherein the arrangement of the active decoupling circuit and the connecting line has an electrical length of (2-n).
- a connecting line eg connecting cable
- n is a natural number
- lambda (l) is the wavelength.
- the above-mentioned object is also achieved by a method for producing a coil of the type described above, wherein the overlapping region in which the at least partially overlapping conductor tracks of the coil are formed is changed by lengthening or shortening until the connection impedance the coil reaches a predetermined impedance value. This also makes it possible to realize the advantages explained above.
- the terminal impedance of the coil may be 50 ohms or 25 ohms.
- 1 shows a device for wireless signal transmission
- Figure 2 is a coil
- Figure 4 shows another embodiment of a coil
- FIG 5 shows the individual conductor tracks of the coil according to Figure 4.
- FIG. 6 shows a cross section through the conductor tracks of the coil according to FIG. 4 and
- FIG. 7 shows a coil with active decoupling circuit in a further embodiment.
- FIG. 1 shows a device 1 for wireless signal transmission by means of electromagnetic waves.
- the device 1 has a signal transmitting and / or receiving device 2, which has an input impedance ZE.
- a coil 3 is shown, the conductor tracks 4 has.
- the conductor tracks 4 of the coil 3 are connected to connection lines 5 of the coil 3. Via the connecting lines 5, the coil 3 can be connected to the terminals of the signal transmitting and / or receiving device 2 which have the input impedance ZE.
- the coil 3 has a connection impedance ZS. The aim now is to adapt the connection impedance ZS to the input impedance ZE.
- the coil 3 can be provided with an impedance matching circuit 6, for example a matching network formed from capacitors, as FIG. 2 shows.
- the impedance matching circuit 6 may be one parallel to the coil 3 switched tuning capacitor CT and a switched in series with the coil 3 Matching capacitor CM have.
- the tuning capacitor CT results in a resonant circuit with the inductance of the conductor tracks 4.
- the real part of the impedance ZS can be set to the desired impedance value of eg 50 ohms.
- the matching capacitor CM the remaining imaginary part can be compensated so that the complex input impedance ZS now has the desired value of, for example, 50 ohms.
- FIG. 3 shows the use of a coil 3 of the type described above in conjunction with an active decoupling circuit 9, 10, 11, 12.
- the coil 3 is connected to the water decoupling circuit via its connecting lines 5 and an impedance-adapted connecting line 8.
- the matching capacitor CM is still present on the coil side.
- the decoupling circuit has a first capacitor 9, which is connected to the connecting line 8 and connected to ground.
- An inductor 10 is connected in series therewith. Behind the inductance 10, a further capacitor 11, arranged parallel to a diode 12, wherein the further capacitor 11 and the diode 12 are connected to ground.
- the capacitors 9, 11 form a filter circuit with the inductor 10.
- the common connection of the components 10, 11, 12 is connected to a preamplifier 13, which may be connected to the signal transmitting and / or receiving device 2.
- this decoupling circuit 9, 10, 11, 12 its resonant behavior, that is to say the intrinsic resonant circuit of the coil, can be coupled out for the use of the coil 3 during a transmission process by suppressing the current in the coil by means of an impedance transformation ,
- FIG. 7 shows a further embodiment of such an end coupling circuit, via which the coil 3 is connected to a preamplifier 13.
- another capacitor 16 is connected in series.
- the diode 12 is thus connected via the capacitor 16 to the preamplifier 13.
- the impedance matching circuit 6 described can be formed entirely or at least partially by conductor tracks 4 of the coil 3 that are at least partially overlapping one another, which is shown by way of example in FIG. Let it be assumed that a lower layer 4b of the conductor tracks in an overlapping region 7 overlaps an upper layer 4a of the conductor tracks in an angular range a. As can be seen, the overlap area 7 extends over an angle range a, which is not a multiple of 360 degrees. For example, the angle range a may be in the range of 90 degrees to 270 degrees.
- the conductor tracks 4a, 4b are connected via respective connection points 15 to conductors of the connection line 5.
- the conductor tracks 4a, 4b can be used, for example, as conductor tracks on a printed circuit board 14, e.g. a flexible printed circuit board, be formed. Accordingly, it can be a printed circuit board 14 coated on two sides with conductive material, the one conductor run 4a being formed on one side of the conductor plate and the other conductor run 4b being formed on the opposite side of the printed circuit board 14.
- FIG. 5 illustrates the appearance of the individual conductor tracks 4a, 4b, if they are not shown overlapping.
- the conductor tracks 4a, 4b may have approximately a sickle shape.
- FIG. 6 shows a cross section through the arrangement according to FIG. 4 in the overlapping area 7.
- the conductor tracks 4a, 4b have a comparatively large width B in relation to their height H, for example a width B at least five times as large height H.
- the inner diameter of the coil 3, characterized by 2ri is substantially larger than the width B of the conductor tracks 4a, 4b, for example at least ten times as large as the width B.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018109540.6A DE102018109540A1 (de) | 2018-04-20 | 2018-04-20 | Spule sowie Einrichtung zur drahtlosen Signalübertragung sowie ein Verfahren zur Herstellung einer derartigen Spule |
PCT/EP2019/059827 WO2019201938A1 (de) | 2018-04-20 | 2019-04-16 | Spule sowie einrichtung zur drahtlosen signalübertragung sowie ein verfahren zur herstellung einer derartigen spule |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3781960A1 true EP3781960A1 (de) | 2021-02-24 |
Family
ID=66286320
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19719459.0A Withdrawn EP3781960A1 (de) | 2018-04-20 | 2019-04-16 | Spule sowie einrichtung zur drahtlosen signalübertragung sowie ein verfahren zur herstellung einer derartigen spule |
Country Status (4)
Country | Link |
---|---|
US (1) | US20210242589A1 (de) |
EP (1) | EP3781960A1 (de) |
DE (1) | DE102018109540A1 (de) |
WO (1) | WO2019201938A1 (de) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BR112022011507A2 (pt) * | 2019-12-12 | 2022-08-23 | Groguru Inc | Comunicação de duas vias sem fio em mídia complexa |
JP2021150849A (ja) * | 2020-03-19 | 2021-09-27 | 株式会社村田製作所 | 高周波モジュール及び通信装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0239426B1 (de) * | 1986-02-07 | 1990-05-23 | General Electric Cgr S.A. | Empfangsantenne für ein Bilderzeugungsgerät mittels kernmagnetischer Resonanz |
US5049821A (en) * | 1990-02-15 | 1991-09-17 | University Of Florida | Continuously variable field of view surface coil for NMR imaging |
JP3345053B2 (ja) * | 1992-09-22 | 2002-11-18 | 株式会社日立製作所 | 核磁気共鳴装置 |
US6408202B1 (en) * | 1998-11-03 | 2002-06-18 | The Johns Hopkins University | Transesophageal magnetic resonance analysis method and apparatus |
DE102006042996A1 (de) * | 2006-09-13 | 2007-10-04 | Siemens Ag | Antenne für Magnetresonanzanwendungen |
CN201141913Y (zh) * | 2007-10-31 | 2008-10-29 | 西门子(中国)有限公司 | 磁共振线圈 |
WO2010018479A1 (en) * | 2008-08-13 | 2010-02-18 | Koninklijke Philips Electronics N.V. | Magnetic resonance rf coil |
US8138762B2 (en) * | 2009-08-24 | 2012-03-20 | Imris Inc. | Coil decoupling for an RF coil array |
-
2018
- 2018-04-20 DE DE102018109540.6A patent/DE102018109540A1/de not_active Withdrawn
-
2019
- 2019-04-16 EP EP19719459.0A patent/EP3781960A1/de not_active Withdrawn
- 2019-04-16 WO PCT/EP2019/059827 patent/WO2019201938A1/de active Application Filing
- 2019-04-16 US US17/049,159 patent/US20210242589A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
DE102018109540A1 (de) | 2019-10-24 |
US20210242589A1 (en) | 2021-08-05 |
WO2019201938A1 (de) | 2019-10-24 |
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