EP3731343A1 - Antenne - Google Patents

Antenne Download PDF

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Publication number
EP3731343A1
EP3731343A1 EP19171114.2A EP19171114A EP3731343A1 EP 3731343 A1 EP3731343 A1 EP 3731343A1 EP 19171114 A EP19171114 A EP 19171114A EP 3731343 A1 EP3731343 A1 EP 3731343A1
Authority
EP
European Patent Office
Prior art keywords
core
lower cores
cores
support rod
antenna
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Withdrawn
Application number
EP19171114.2A
Other languages
German (de)
English (en)
Inventor
Szymon Pasko
Stéphane LEBRETON
Shemsi Musiqi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaffner EMV AG
Original Assignee
Schaffner EMV AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaffner EMV AG filed Critical Schaffner EMV AG
Priority to EP19171114.2A priority Critical patent/EP3731343A1/fr
Priority to DE102020105978.7A priority patent/DE102020105978A1/de
Publication of EP3731343A1 publication Critical patent/EP3731343A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/325—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle
    • H01Q1/3283—Adaptation for use in or on road or rail vehicles characterised by the location of the antenna on the vehicle side-mounted antennas, e.g. bumper-mounted, door-mounted
    • 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
    • H01F27/24—Magnetic cores
    • H01F27/26—Fastening parts of the core together; Fastening or mounting the core on casing or support
    • H01F27/266—Fastening or mounting the core on casing or support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/10—Composite arrangements of magnetic circuits
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/06—Insulation of windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/32—Adaptation for use in or on road or rail vehicles
    • H01Q1/3208—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used
    • H01Q1/3233—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems
    • H01Q1/3241—Adaptation for use in or on road or rail vehicles characterised by the application wherein the antenna is used particular used as part of a sensor or in a security system, e.g. for automotive radar, navigation systems particular used in keyless entry systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/40—Radiating elements coated with or embedded in protective material
    • 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
    • H01Q7/06—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 with core of ferromagnetic material
    • H01Q7/08—Ferrite rod or like elongated core

Definitions

  • Antennas usually consist of a core and a coil. Depending on the transmission frequency and the bandwidth, the core and the coil must be designed accordingly.
  • the bandwidths of antennas are getting wider, e.g. for UWB antennas and the range of the antenna is getting bigger, which means, for example, that the cores are getting longer and longer. Long cores are also more prone to breakage than short cores and are more complex to manufacture.
  • an antenna which has the following: a magnetic core and a coil which is wound around the magnetic core, the magnetic core having at least two sub-cores, the at least two sub-cores one behind the other in a longitudinal direction of the magnetic Core are arranged.
  • the antenna further has pressure means which are designed to press the lower cores against one another in the longitudinal direction.
  • the contact pressure ensures good and stable electrical properties of the antenna even with temperature fluctuations and bumps, since the contact pressure between the antennas hardly fluctuates in the event of bumps or temperature fluctuations.
  • the pressure means is preferably designed such that the contact pressure between the lower cores can be adjusted. This can preferably be achieved by arranging the sub-cores between two stops, e.g. on the support rod, done, at least one of the two stops is adjustable in its axial position. By adjusting the contact pressure, the electrical properties of the antenna can also be fine-tuned.
  • Figs. 1 to 5 show a first embodiment of the invention.
  • the lower cores 1.1 have a longitudinal axis which extends in the longitudinal direction 7.
  • the lower cores 1.1 are preferably longer in the longitudinal direction 7 than in the second direction 8 and / or than in the third direction 9.
  • the lower cores 1.1 preferably each have a first axial side or a first end and a second axial side opposite the first axial side or a second end opposite the first end.
  • the first and second axial sides are preferably arranged parallel to one another.
  • the first and / or second axial side preferably each form a flat surface which is in contact with a corresponding axial side of a possibly adjacent lower core 1.1.
  • the lower cores 1.1 are preferably arranged one behind the other in the longitudinal direction 7.
  • the first sub-cores are preferably 1.1 so arranged one behind the other that the longitudinal axes of the lower cores 1.1 are arranged coaxially, ie the longitudinal axes of the first lower cores 1.1 form the respective extension of the adjacent lower cores 1.1.
  • the first axial side of a first lower core 1.1 is preferably arranged opposite a first axial side of a second lower core 1.1.
  • the first sub-cores 1.1 are preferably arranged one behind the other such that the first axial side of the first sub-core 1.1 completely overlaps the first axial side of the second sub-core 1.1, ie the axial side of the first sub-core 1.1 overlaps the axial side of the second sub-core 1.1 and / or the axial side of the second sub-core 1.1 overlaps the axial side of the first sub-core 1.1.
  • a first lower core 1.1 represents an extension of the adjacent second lower core 1.1 in the longitudinal direction 7.
  • the axial sides of the lower cores 1.1 are preferably arranged in contact with one another. However, it would also be possible to arrange the lower cores 1.1 with a spacing between the axial sides of the lower cores 1.1.
  • the lower core 1.1 is preferably designed in the shape of a hollow cylinder.
  • the cross-sectional shape of the recess or the hollow cylinder opening is preferably circular.
  • the inner cross-sectional shape can, however, also have a different shape, for example triangular, square, polygonal.
  • the external cross-sectional shape of the hollow cylinder is preferably circular, as described above, but can also other shapes such as rectangular, triangular, polygonal or other-shaped.
  • the inner cross-sectional shape of the hollow cylinder is preferably circular, as described above, but can also be other shapes such as rectangular, triangular, polygonal or some other shape.
  • the inner cross-sectional shape and the outer cross-sectional shape have the same shape (of course with different sizes). In another embodiment, the inner cross-sectional shape and the outer cross-sectional shape have a different shape.
  • the description of the recess of the lower core 1.1 applies to all lower cores 1.1.
  • the recesses of all lower cores 1.1 are preferably designed in the same way. However, it would also be possible to design the recesses of the lower cores 1.1 differently in certain features.
  • the support rod 4 is designed to be guided through the recesses of the at least two lower cores 1.1.
  • the support rod 4 preferably extends through the recesses of the lower cores 1.1 in such a way that the lower cores 1.1 are aligned in their longitudinal axes in the first direction 7 and thus form the core 1.
  • the recesses in the lower cores 1.1 and the support rod 4 are preferably designed in such a way that the support rod 4 cannot be displaced relative to the lower cores in the second direction 8 and / or in the third direction 9. As a result, the lower cores 1.1 are automatically aligned with one another when they are arranged on the support rod 4.
  • the inner cross section of the recesses of the lower cores 1.1 and the outer cross section of the support rod 4 are preferably designed so that the support rod 4 cannot be displaced relative to the lower cores 1.1 in the second direction 8 and / or in the third direction 9.
  • the lower cores 1.1 are automatically aligned with one another when they are arranged on the support rod 4. This can be achieved, for example, in that the inner cross-section of the recesses of the lower cores 1.1 and the outer cross-section of the support rod 4 correspond to one another.
  • the inner cross section of the recesses of the lower cores 1.1 and the outer cross section of the support rod 4 allow the Lower cores 1.1 can rotate around the support rod 4. This prevents possible tension when the lower cores 1.1 are pressed against one another axially in the longitudinal direction 7 by screwing, which will be described later. This further reduces the risk of breakage.
  • the support rod 4 is preferably made of a different material than the magnetic material of the lower cores 1.1. As a result, the breaking stability of the core 1 is no longer defined by the material of the lower cores 1.1, but by the support rod 4.
  • the support rod 4 is preferably made of a material that is more resistant to breakage than the magnetic material of the lower cores 1.1. This significantly improves the stability of the core 1.
  • the material of the support rod 4 preferably has a lower magnetic permeability than the magnetic material of the core 1 or the lower cores 1.1. Materials with high permeability are often more prone to breakage.
  • the support rod 4 is preferably made of metal, for example copper. However, it would also be possible to manufacture the support rod from plastic.
  • the support rod 4 is made of an electrically conductive material. In another exemplary embodiment, the support rod 4 is made of an electrically insulating material.
  • the support rod 4 has a first end in the longitudinal direction 7 and an end opposite the first end.
  • the support rod 4 preferably has a first stop 42 at the first end of the core 1 and / or at the first end of the support rod 4.
  • the first stop 42 is designed to allow the first end of the core 1 or the axial side of the lower core 1.1 arranged at the first end to rest against the first stop 42 and thus to block it in the axial direction 7 (in a first axial displacement direction).
  • the first stop 42 is formed integrally from the support rod 4. However, it is also possible to fasten the first stop 42 on the first support rod 4. In this exemplary embodiment, the first stop 42 cannot be displaced in the axial direction 7.
  • the second stop 44 is preferably designed to be detachable from the support rod 4 so that the lower cores 1.1 can be pushed onto the support rod 4 (in the axial direction 7) and can then be fastened with the second stop 44 in their axial position.
  • the support rod 41 and the second stop 44 (or the first stop 43) have a screw mechanism that allows the axial position of the second stop 44 (or the first stop 43) to be adjusted and / or the second stop 44 (or the first Stop 43) for sliding the lower cores 1.1 onto the support rod 4 in the axial direction 7.
  • the support rod 7 preferably has an external thread 41 and the second stop 44 (or the first stop 43) has a recess with an internal thread, so that the second stop 44 can be screwed onto the external thread 41 of the support rod 4.
  • the second stop 44 can be screwed against the axial side of one of the lower cores 1.1 resting on the second stop 44.
  • the support rod 4 preferably has pressure means.
  • the pressure means are designed to compress the lower cores 1.1 in the longitudinal direction 7 (ie to press them against one another). This has the advantage that the core 1 with the transitions between the lower cores 1.1 behaves much more similarly to a one-piece magnetic core of the same size, since the axial sides of the lower cores 1.1 are pressed against one another.
  • the pressure means are preferably achieved by the two stops 42 and 44 described, the axial position of at least one of the two stops 42 and 44 being adjustable. The first stop 42 and the second stop 44 can thus be moved towards one another and the lower cores 1.1 located between the stops 42 and 44 can be pressed against one another with their axial sides or - be pressed.
  • the adjustment of the axial position preferably also allows adjustment of the contact pressure between the lower cores 1.1, which in turn allows fine adjustment of the electrical parameters of the antenna.
  • Core 1 is thus formed by a plurality of lower cores 1.1 arranged one behind the other on support rod 4.
  • the core 1 has two opposite ends in the longitudinal direction 7, which are formed by the corresponding ends or axial sides of the respective last lower cores 1.1 in the longitudinal direction 7.
  • the pressure medium ensures stable positioning of the lower cores 1.1 and small fluctuations in the electrical parameters of the antenna.
  • the coil 2 is wound around the core 1.
  • the winding direction of the coil 2 is in the longitudinal direction 7.
  • the coil 2 preferably has a plurality of turns around the core 1, preferably with more than two, preferably with more than five, preferably with more than ten, preferably with more than fifteen, preferably with more than twenty turns.
  • the coil 2 preferably extends from the first end of the core 1 to the second end of the core 1, so that the area between the last turn of the coil 2 in the direction of the first end of the core 1 and the last turn of the coil 2 in the direction second end of the core 1 make up at least 70%, preferably at least 75%, preferably at least 80% of the longitudinal extent of the core 1.
  • the coil 2 preferably extends over the at least two lower cores 1.1, preferably over all lower cores 1.1.
  • the coil 2 or a coil wire of the coil 2 is preferably wound onto the core 1.
  • the core 1 is held in a core carrier and that the coil 2 or the coil wire is wound onto this one core carrier.
  • the coil 2 preferably has a coil wire which is wound around the core 1 or the core carrier 4.
  • the coil wire is preferably insulated. This allows the coil wire to be wound directly onto the core 1.
  • the coil wire is wound so that both ends of the coil wire at one end of the core 1 are connected to terminals of the antenna. By doing The embodiment shown, the coil wire is wound in both directions (cross winding).
  • the coil 2 is wound from the first end of the core 1 to the second end of the core 1 in one direction and the coil wire is then wound from the second end of the core 1 to the first end of the core 1 (without turns around the core 1) returned. It would of course also be possible to lead the coil wire first from the first end of the core 1 to the second end of the core 1 (without turns around the core 1) and then from the second end of the core 1 to the first end of the core 1 in wrap one direction.
  • the housing 3 is designed to enclose the core 1 with the coil 2.
  • the housing 3 is preferably designed to accommodate and / or enclose the core 1 formed from the lower cores 1.1 pushed onto the support rod 4 and the coil 2.
  • the housing 3 preferably has a first opening which is designed to introduce the core 1 with the coil 2 into the housing 3.
  • the first opening is preferably closed by a closure 43.
  • the closure 43 is preferably formed by the first end of the support rod 44, so that the support rod 4 closes the housing 3 with the closure 43 when it is inserted into the housing 3. This has the advantage that the closure 43 is used both for positioning the core 1 and the coil 2 in the housing 3 and for closing it. However, it is also possible for the first opening to be closed by a separate closure 43.
  • the closure 43 preferably has a connection for the electrical connection of the antenna, in particular the coil 2.
  • the connection preferably has two electrically conductive rods 6 which extend through the closure 43.
  • One side of each conductive rod 6 protrudes from the closure 43 on the outer side, so that the finished antenna can be electrically connected.
  • the opposite side of each conductive rod protrudes on the inner side of the closure 43, the ends of the coil 2 or the coil wire being connected to one of these conductive rods 6 (on the inside).
  • the support rod 4 is preferably so designed that the core 1 or the support rod 4 has a predefined position after assembly in the housing 3. On one side of the antenna, this is achieved, for example, by positioning the closure 43 in the first opening of the housing 3.
  • the support rod 4 preferably also has positioning means which hold the support rod 4 in the predefined position when the core carrier 4 is mounted in the housing 3.
  • the further positioning means are preferably arranged on the end of the support rod 4 opposite to the closure 43.
  • the further positioning means are implemented here, for example, by the second stop 44, which has an alignment shape 45 on the side opposite the stop surface, which engages in a corresponding alignment shape 32 of the housing 3 so that the support rod 4 is correctly positioned in the housing 3.
  • the alignment form 45 could also be arranged directly on the support rod.
  • the alignment shape 45 of the support rod 4 or of the second stop 44 is here a central depression (female connection shape).
  • the alignment shape 32 of the housing 3 is a corresponding projection 32 (male connection shape) which engages in the central recess.
  • the alignment form 32 is arranged here in a second closure 31 which closes a second opening of the housing 3.
  • a potting compound 5 is arranged between the housing 3 and the core 1 with the coil 2 or the support rod 4 with the core 1 and the coil 2.
  • the core 1 with the coil 2 is inserted into the housing 3 and encapsulated therein with the potting compound 5.
  • the sealing compound 5 is often referred to as potting.
  • the potting compound 5 preferably fills the, preferably all, cavities in the housing 3 so that the heat from the core 1 and the coil 2 are effectively dissipated and the core 1 with the coil 2 or the core carrier 4 with the core 1 and the Coil 2 is stored stably.
  • a potting compound 5 is used which (in the cured state) is softer than 60 Shore A, preferably 40 Shore A, preferably 35 Shore A, preferably 30 Shore A, preferably 27 Shore A, preferably 25 Shore A. It was found that the casting compound 5 is softer than 60 Shore A or than the other preferred values mentioned, not just the breaking stability Improved, but surprisingly also improves the stability of the electrical values of the antenna.
  • the potting compound 5 (in the cured state) is preferably harder than 10 Shore A, preferably than 15 Shore A. The potting compound 5 with a deformation between 10 and 35 Shore A has been found to be particularly advantageous.
  • the antenna described is preferably designed for use in a vehicle for the transmission of key data for opening and / or starting the vehicle.
  • This antenna is preferably mounted in a vehicle.
  • the antenna described can be designed for many different radio frequencies.
  • the radio frequency of the antenna is greater than 10 kHz, preferably greater than 50 kHz, preferably greater than 100 kHz.
  • the radio frequency of the antenna is less than 500 kHz, preferably less than 250 kHz, preferably less than 150 kHz.
  • the radio frequency is 125 kHz.
  • the radio frequency describes the center frequency of the transmitted radio frequency band.
  • the lower cores 1.1 with their recesses are first pushed onto the support rod 4.
  • the lower cores 1.1 are preferably pushed onto the support rod 4 in the longitudinal direction 7.
  • the second stop 44 is removed from the second end of the support rod 4.
  • the second stop 44 is fastened again, preferably screwed, onto the support rod 4.
  • the lower cores 1.1 could also laterally (in the direction of any linear combination of the second direction 8 and the third direction 9 or in the direction radial to the longitudinal direction 7) onto the support rod 4 be pushed. The stop 44 therefore does not have to be removed.
  • the lower cores 1.1 are preferably pressed against one another with their axial sides with the pressure medium. This can be done, for example, by moving the second stop 44 axially, here for example screwing it shut.
  • the coil 2 is then wound onto the core 1 or onto the lower cores 1.1.
  • the coil wire is connected to the connector of the antenna.
  • the manufacturing process preferably also provides for a fine adjustment step. For this purpose, the pressure of the pressure medium on the axial sides of the lower cores 1.1 is adjusted so that the electrical properties of the antenna or the magnetic properties of the coil 2 and / or the core 1 match predetermined values.
  • This step can be done automatically by a production robot or a production machine, which is connected to the connection of the antenna or to the two coil ends, and which adjusts the pressure of the pressure medium depending on a measurement result at the connection or the coil ends.
  • the pressure can be adjusted, for example, by the screwing state of the second stop 44. This enables a very high quality antenna to be produced.
  • the core 1 with the coil 2 or the support rod 4 with the core 1 and the coil 2 is inserted into the housing 3.
  • the core 1 with the coil 2 or the support rod 4 with the core 1 and the coil 2 is cast in the housing 3 with the potting compound 5.
  • the potting compound 5 then hardens and the antenna is ready.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Sensing (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Coils Or Transformers For Communication (AREA)
EP19171114.2A 2019-04-25 2019-04-25 Antenne Withdrawn EP3731343A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19171114.2A EP3731343A1 (fr) 2019-04-25 2019-04-25 Antenne
DE102020105978.7A DE102020105978A1 (de) 2019-04-25 2020-03-05 Antenne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19171114.2A EP3731343A1 (fr) 2019-04-25 2019-04-25 Antenne

Publications (1)

Publication Number Publication Date
EP3731343A1 true EP3731343A1 (fr) 2020-10-28

Family

ID=66286232

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19171114.2A Withdrawn EP3731343A1 (fr) 2019-04-25 2019-04-25 Antenne

Country Status (2)

Country Link
EP (1) EP3731343A1 (fr)
DE (1) DE102020105978A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968807A (en) * 1957-05-04 1961-01-17 Telefunken Gmbh Ferro-magnetic core antenna
DE9318303U1 (de) * 1993-11-25 1994-01-27 Siemens Ag Ferritstab oder Ferritkern
EP1397845A2 (fr) 2001-05-23 2004-03-17 Neosid Pemetzrieder Gmbh & Co. Kg Antenne ferrite
DE102016010493A1 (de) * 2016-08-31 2018-03-01 Huf Hülsbeck & Fürst Gmbh & Co. Kg Kraftfahrzeugtürgriffanordnung mit abgedichtetem Elektronikbauraum
US20180122551A1 (en) * 2015-04-15 2018-05-03 Autonetworks Technologies, Ltd. Reactor
US20180159224A1 (en) 2016-12-02 2018-06-07 Sumida Corporation Antenna device and manufacturing method for the same
US10056687B2 (en) 2016-03-04 2018-08-21 Premo, S.L. Flexible elongated inductor and elongated and flexible low-frequency antenna

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2968807A (en) * 1957-05-04 1961-01-17 Telefunken Gmbh Ferro-magnetic core antenna
DE9318303U1 (de) * 1993-11-25 1994-01-27 Siemens Ag Ferritstab oder Ferritkern
EP1397845A2 (fr) 2001-05-23 2004-03-17 Neosid Pemetzrieder Gmbh & Co. Kg Antenne ferrite
US20180122551A1 (en) * 2015-04-15 2018-05-03 Autonetworks Technologies, Ltd. Reactor
US10056687B2 (en) 2016-03-04 2018-08-21 Premo, S.L. Flexible elongated inductor and elongated and flexible low-frequency antenna
DE102016010493A1 (de) * 2016-08-31 2018-03-01 Huf Hülsbeck & Fürst Gmbh & Co. Kg Kraftfahrzeugtürgriffanordnung mit abgedichtetem Elektronikbauraum
US20180159224A1 (en) 2016-12-02 2018-06-07 Sumida Corporation Antenna device and manufacturing method for the same

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