antenna

Abstract

To provide an antenna including a plurality of partial cores.SOLUTION: The present invention relates to an antenna including a magnetic core (1) and a coil (2) wound around the magnetic core (1). The magnetic core (1) has at least two first partial cores (1.1) and at least one second partial core (1.2). The at least two first partial cores (1.1) are arranged one behind the other in a longitudinal direction (8) of the magnetic core (1), and each of the at least two first partial cores (1.1) has a lateral side. The at least two first partial cores (1.1) have a first first partial core (1.1) and a second first partial core (1.1). A first second partial core (1.2) is arranged on the lateral side of the first first partial core (1.1) and on the lateral side of the second first partial core (1.1) such that the first second partial core (1.2) overlaps at least partially with the first first partial core (1.1) and at least partially with the second first partial core (1.1).SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to an antenna, and in particular to an antenna for use in a vehicle, configured for the transmission of key data for opening and / or starting the vehicle. [Background technology]

[0002] Antennas usually consist of a core and a coil. Depending on the transmission frequency and bandwidth, the core and coil must be formed appropriately. The bandwidth of antennas is getting wider. For UWB antennas, the range of antennas is increasing. This means, for example, that the cores are getting longer and longer. Also, long cores are more easily damaged than short cores, which makes them more expensive to manufacture.

[0003] Thus, from US Pat. No. 5,399,663, US Pat. No. 5,499,823 and US Pat. No. 5,523,637, it is known to form a core by several lower cores arranged one above the other. This has the advantage that the individual sub-cores are easier to manufacture and the sub-cores are less susceptible to breakage. However, it has been shown that the magnetic properties of a core formed from several sub-cores are very sensitive to shocks and temperature fluctuations, and these antennas often have problems with the stability of their antenna properties. The subcores are placed one behind the other, either spaced apart or in contact. When the subcores are in contact, the magnetic properties vary with the contact pressure between the subcores, which varies with temperature and vibration. When the subcores are spaced apart, the spacing often changes with temperature or external forces, adversely affecting the electrical properties of the core and therefore the electrical properties of the antenna. Therefore, it is not yet possible to implement a high-quality antenna with multiple subcores. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] U.S. Pat. No. 10,056,687 [Patent Document 2] European Patent Application Publication No. 1397845 [Patent Document 3] US Patent Application Publication No. 2018 / 159224 Summary of the Invention [Problem to be solved by the invention]

[0005] The object of the present invention is to find an antenna which is robust, easy to manufacture and has good and stable antenna characteristics. [Means for solving the problem]

[0006] According to the invention, this object is achieved by an antenna and a method for manufacturing such an antenna according to the independent claims.

[0007] The use of at least one second subcore laterally overlapping two of the at least two first subcores allows magnetic bridging of the contact points or gaps between the first subcores, making the core independent of the contact pressure or the size of the gap between the first subcores, independent of temperature fluctuations, vibrations and other external influences. At the same time, the core may be formed from several subcores, which simplifies production and favors the stability of the core against destruction.

[0008] Further advantageous embodiments are specified in the dependent claims.

[0009] The invention will now be explained in more detail with reference to the accompanying drawings. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a first side view of an antenna according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a second side view of the antenna according to the first embodiment of the present invention. [Diagram 3] 1 is a cross-sectional view taken along line AA of an antenna according to a first embodiment of the present invention. [Figure 4]1 is a cross-sectional view taken along line BB of an antenna according to a first embodiment of the present invention. [Diagram 5] 1 is a cross-sectional view taken along line CC of an antenna according to a first embodiment of the present invention. [Figure 6] 1 is a cross-sectional view taken along line DD of an antenna according to a first embodiment of the present invention. [Figure 7] 1 is a cross-sectional view taken along line EE of an antenna according to a first embodiment of the present invention. [Figure 8] FIG. 2 is a three-dimensional view of an antenna according to a second embodiment of the present invention with a half-cut housing and encapsulant. [Figure 9] FIG. 4 is a first side view of an antenna according to a second embodiment of the present invention; [Figure 10] 6 is a cross-sectional view taken along line BB of an antenna according to a second embodiment of the present invention. [Figure 11] 5 is a cross-sectional view taken along line AA of an antenna according to a second embodiment of the present invention. FIG. [Figure 12] 11 is a cross-sectional view taken along line CC of an antenna according to a second embodiment of the present invention. FIG. [Figure 13] FIG. 11 is a cross-sectional view taken along the line DD of an antenna according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Figures 1 to 7 show a first embodiment of the invention. Figures 8 to 13 show a second embodiment of the invention. Both embodiments are described together below. If the first and second embodiments differ in one feature, this is explicitly mentioned. Otherwise, all described features apply to both embodiments.

[0012] In the following description, three orthogonal directions are used: a first direction 7, a second direction 8 and a third direction 9. The first direction 7 is preferably orthogonal to the second direction 8 and the third direction 9. The second direction 8 is preferably orthogonal to the first direction 7 and the third direction 9. The third direction 9 is preferably orthogonal to the first direction 7 and the second direction 8.

[0013] The antenna comprises a core 1 and a coil 2. The antenna preferably further comprises a housing 3, a core support 4 and an injectate 5.

[0014] The core 1 is a magnetic core. The core 1 is made of a magnetic material. By magnetic material it is meant that the material is paramagnetic or ferromagnetic, preferably ferromagnetic. The core 1 is preferably made of a ferrite material (ferrite material) or a powder material (powder core). The magnetic core 1 is preferably made of a rigid magnetic material, i.e. the magnetic core 1 is neither elastic nor flexible.

[0015] The core 1 preferably extends along a first direction 7. The first direction is therefore also referred to as the longitudinal direction 7 of the core 1. The longitudinal axis of the core 1 therefore extends in the first direction 7. The core 1 is preferably longer in the longitudinal direction 7 than in the second direction 8 and the third direction 9. In one embodiment, the core 1 is larger in the second direction 8 (width) than in the third direction 9 (thickness or height). In another embodiment, the core 1 is the same size in the second direction 8 and the third direction.

[0016] According to the invention, the core 1 has at least two first sub-cores 1.1 and at least one second sub-core 1.2. In a first embodiment, the core 1 has five first sub-cores 1.1 and four second sub-cores 1.2. In a second embodiment, the core 1 has four first sub-cores 1.1 and three second sub-cores 1.2. However, the number is arbitrary and may vary as required depending on the length of the core 1 and the length of the sub-cores 1.1, 1.2. The core 1 preferably has n first sub-cores 1.1 and n-1 or n second sub-cores 1.2, where n is 2 or more.

[0017] The magnetic material of the core 1 described above corresponds to the magnetic material of the sub-cores 1.1, 1.2. All of the sub-cores 1.1, 1.2 preferably contain the same magnetic material. However, different magnetic materials may be used in the different sub-cores 1.1, 1.2.

[0018] The first subcore 1.1 has a longitudinal axis extending in the longitudinal direction 7. The first subcore 1.1 is preferably longer in the longitudinal direction 7 than in the second direction 8 and / or the third direction 9. The first subcore 1.1 preferably has side surfaces. The side surfaces are preferably arranged parallel to the longitudinal direction 7. The orthonormal vectors of the side surfaces of the first subcore 1.1 are preferably parallel to the second direction 8 or the third direction 9. The side surfaces preferably form flat surfaces. The first subcore 1.1 preferably has a first axial side surface and a second axial side surface opposite the first axial side surface. The first and / or second axial side surface are preferably perpendicular to the side surface or the longitudinal axis 7 of the respective first subcore 1.1. The first and second axial sides are preferably arranged parallel to each other. The first and / or second axial side surfaces preferably form flat surfaces. The first subcore 1.1 preferably each has a rectangular cross section. The side faces of all first subcores 1.1 are preferably formed identically. However, other cross-sectional shapes are conceivable, such as triangular, semicircular, etc. The cross-sectional shape of the first subcores 1.1 is preferably constant or identical along the longitudinal direction 7 of the first subcores 1.1. All first subcores 1.1 preferably have the same cross-sectional shape. The cross-sectional shape of the first subcores 1.1 is defined as a cross section perpendicular to the longitudinal direction 7. Preferably, the first subcores 1.1 are rectangular, i.e. formed with six side faces arranged at right angles to one another. All first subcores 1.1 are preferably formed with the same shape.

[0019] The second subcore 1.2 has a longitudinal axis extending in the longitudinal direction 7. The second subcore 1.2 is preferably longer in the longitudinal direction 7 than in the second direction 8 and / or the third direction 9. The second subcore 1.2 preferably has lateral faces. The lateral faces are preferably arranged parallel to the longitudinal direction 7 and / or parallel to the parallel lateral faces of the first subcore 1.1. The outer orthonormal vectors of the second subcore 1.2 are preferably parallel to the second direction 8 or the third direction 9 or the outer orthonormal vectors of the first subcore 1.1. The shape of the lateral faces of the second subcore 1.2 preferably corresponds to the shape of the lateral faces of the first subcore 1.1, so that the lateral faces of the second subcore 1.2 can be placed (over the entire surface) on the lateral faces of the first subcore 1.1. The lateral faces preferably form flat surfaces. The second subcore 1.2 preferably has a first axial lateral face and a second axial lateral face opposite the first axial lateral face. The first and / or second axial side is preferably perpendicular to the side or longitudinal axis 7 of the respective second subcore 1.2. The first and second axial side are preferably arranged parallel to each other. The first and / or second axial side preferably form a flat surface. The second subcores 1.2 preferably have a rectangular cross section, respectively. The side surfaces of all second subcores 1.2 are preferably formed identically. However, other cross-sectional shapes are conceivable, such as triangular, semicircular, etc. The second subcores 1.2 preferably have the same cross-sectional shape as the first subcore 1.1. The cross-sectional shape of the second subcores 1.2 is preferably constant or identical along the longitudinal direction 7 of the subcores 1.2. All of the second subcores 1.2 preferably have the same cross-sectional shape. The cross-sectional shape of the second subcores 1.2 is defined as a cross section perpendicular to the longitudinal direction 7. Preferably, the second subcores 1.2 are rectangular parallelepipeds. They are formed by six side surfaces arranged at right angles to each other. The second subcores 1.2 are preferably all of the same shape. The second subcores 1.2 are preferably shaped like the first subcore 1.1 (see first example). However, the shapes of the first and second subcores 1.1, 1.2 may be different (see second example where the first and second subcores 1.1, 1.2 have different lengths). The second subcores 1.2 are preferably identical to the first subcore 1.1.Thereby, the same sub-core may be used for the first sub-core 1.1 and the second sub-core 1.2. However, there are also advantages to using different sub-cores for the first sub-core 1.1 and the second sub-core 1.2. In that way, different magnetic materials may be used. The second sub-core 1.2 may have a higher permeability than the first sub-core 1.1. As a result, a simpler (and cheaper) magnetic material with a lower magnetic permeability is selected for the first sub-core 1.1, which represents the major proportion of the magnetic material, while the high magnetic permeability can only be used for the bridging function. Up to this point, the second sub-core 1.2 has been described in large part. Of course, this description also applies to an embodiment with only the second sub-core 1.2.

[0020] The first subcores 1.1 are preferably arranged one behind the other in the longitudinal direction 7. Preferably, the first subcores 1.1 are arranged one behind the other such that the longitudinal axes of the first subcores 1.1 are arranged coaxially, i.e. such that the longitudinal axes of the first subcores 1.1 form an extension of each of the adjacent first subcores 1.1. The first axial side of the first first subcore 1.1 is preferably arranged opposite the first axial side of the second first subcore 1.1. The first subcores 1.1 are preferably arranged one behind the other such that the first axial side of the first first subcore 1.1 completely overlaps the first axial side of the second first subcore 1.1. The axial side of the first first subcore 1.1 overlaps the axial side of the second first subcore 1.1 and / or the axial side of the second first subcore 1.1 overlaps the axial side of the first first subcore 1.1. In other words, the first subcores 1.1 are an extension of the neighboring first subcores 1.1 in the longitudinal direction 7. In one embodiment, the first subcores 1.1 are arranged at a distance between the axial sides of the first subcores 1.1. In an exemplary embodiment, the axial sides of the first subcores 1.1 are arranged in contact (see the first and second embodiments). Due to the magnetic bridge through the second subcore 1.2 described below, it is magnetically immaterial whether the first subcores 1.1 are in contact or spaced apart. Therefore, the distance may be chosen to be large, i.e. to save material.

[0021] According to the invention, the first second subcore 1.2 is arranged such that the side surface of the first second subcore 1.2 overlaps at least a part of the side surface of the first first subcore 1.1 and at least a part of the side surface of the second first subcore 1.1. This means that the projection of the first second subcore 1.2 onto the first first subcore 1.1 perpendicular to the longitudinal axis 7 intersects with the projection of the first second subcore 1.2 onto the second first subcore 1.1 perpendicular to the longitudinal axis 7. The side surface of the first second subcore 1.2 preferably overlaps with the side surface of the first first subcore 1.1 with at least a minimum overlap length and overlaps with the side surface of the second first subcore 1.1 with at least a minimum overlap length. The minimum overlap length is at least 1%, preferably at least 2% of the shortest subcore (in the longitudinal direction 7) among the first first subcore 1.1, the second first subcore 1.1 and the first second subcore 1.2, preferably the shortest among all subcores 1.1, 1.2. As a result, a magnetic bridge is formed at the junction between the two first subcores 1.1 connected in series, which eliminates the variations due to temperature and external influences on the transition between the two first subcores 1.1. For stability reasons, however, a longer overlap length is preferred. The first subcore 1.1 is preferably arranged on a first level and at least one second subcore 1.2 is arranged on a second level. The second level is preferably parallel to the first level. In one embodiment, the first plane and / or the second plane is perpendicular to the second direction 8, i.e. the first subcore 1.1 and the at least one second subcore 1.2 are stacked in the second direction 8 (see the second embodiment where the stacking direction is the second direction 8). In one embodiment, the first plane and / or the second plane is perpendicular to the third direction 9, i.e. the first subcore 1.1 and the at least one second subcore 1.2 are stacked in the third direction 9 (see the first embodiment where the stacking direction is the third direction 9). The stacking direction may also be a linear combination of the second and third directions 8 and 9.Preferably, the projection of the first second subcore 1.2 in a direction perpendicular to the stacking direction and the longitudinal direction 7 does not overlap the first first subcore 1.1 and / or the second first subcore 1.1 and / or the projection of the first first subcore 1.1 overlaps in a direction perpendicular to the stacking direction and in the longitudinal direction 7 not the first second subcore 1.2. In a first embodiment this is a projection in the second direction 8 and in a second embodiment this is a projection in the third direction 9. However, embodiments with such overlap are also conceivable. For example, two L-shaped cross sections may be placed on top of each other so that there are two stacking directions, for example the second direction 8 and the third direction 9. In this embodiment, the first subcore 1.2 and the second subcore 1.1 each have an L-shaped or pointed cross section. The cross sections of the assembled first and second subcores 1.1 and 1.2 in the overlap region then again result in a rectangular cross section. The first subcore 1.1 and the at least one second subcore 1.2 may preferably be formed such that the first subcore 1.1 and the at least one second subcore 1.2 are stacked in a stacking direction perpendicular to the longitudinal axis 7, or simply stacked. However, it is also conceivable to insert the at least one second subcore 1.2 longitudinally and into an axial opening in the longitudinal direction 7 of the first subcore 1.1. However, this is rather complicated to manufacture and also has a negative effect on the risk of breakage. The side faces of the second subcore 1.2 preferably contact the side faces of the first and second subcores 1.1. The longitudinal axis of the at least one second subcore 1.2 is preferably arranged parallel to the longitudinal axes of the at least two first subcores 1.1. The side faces of the at least one second subcore 1.2 are preferably arranged parallel to the side faces of the at least two first subcores 1.1. The cross-section (perpendicular to the longitudinal axis 7) of the core 1 in the overlap region of one of the at least one second subcore 1.2 and one of the at least two first subcores 1.1 is preferably rectangular. This rectangular cross-section of the core 1 is preferably formed by the rectangular cross-sections of the corresponding first and second subcores 1.1 and 1.2.However, the rectangular cross section of the core 1 may also be formed from a triangular cross section, an L-shaped cross section or any other cross section of the first and second sub-cores 1.1 and 1.2.

[0022] If the core 1 has more than one second subcore 1.2, the following preferably applies to the arrangement of the second subcores 1.2. In this case, there is at least a second second subcore 1.2. The second first subcore 1.1 is arranged such that the side of the second first subcore 1.1 overlaps with at least a part of the side of the first second subcore 1.2 and with at least a part of the side of the second second subcore 1.2. This means that the projection of the second first subcore 1.1 perpendicular to the longitudinal axis 7 onto the first second subcore 1.2 intersects it, and the projection of the second first subcore 1.1 perpendicular to the longitudinal axis 7 onto the second second subcore 1.2 intersects it. The side of the second first subcore 1.1 preferably overlaps with the side of the first second subcore 1.2 with at least a minimum overlap length, and overlaps with the side of the second second subcore 1.2 with at least a minimum overlap length. The minimum overlap length is at least 1%, preferably at least 2% of the shortest length (in the longitudinal direction 7) of the shortest subcore among the second first subcore 1.1, the first second subcore 1.2 and the second second subcore 1.2, preferably of the shortest length (in the longitudinal direction 7) of all subcores 1.1, 1.2. Thereby, a magnetic bridge is formed at the contact point between the two second subcores 1.2 connected in series. The second subcores 1.2 are preferably arranged one behind the other in the longitudinal direction 7. Preferably, the second subcores 1.2 are arranged such that the longitudinal axes of the second subcores 1.2 are arranged coaxially, i.e. one behind the other. The longitudinal axes of the second subcores 1.2 are an extension of each of the adjacent second subcores 1.2. The first axial side of the first second subcore 1.2 is preferably arranged opposite the first axial side of the second second subcore 1.2. Preferably, the second subcores 1.2 are arranged one behind the other such that the first axial side of the first second subcore 1.2 completely overlaps the axial side of the second second subcore 1.2. The axial side of the first second subcore 1.2 overlaps the first axial side of the second second subcore 1.2 and / or the first axial side of the second second subcore 1.2 overlaps the first axial side of the first second subcore 1.2. In other words, the second subcores 1.2 represent the extension of the adjacent second subcores 1.2 in the longitudinal direction 7. In one embodiment, the second subcores 1.2 are arranged at a distance between the axial sides of the second subcores 1.2 (see second embodiment).In an exemplary embodiment, the axial sides of the second subcores 1.2 are arranged in contact (see the first embodiment). The distance may be selected to be arbitrarily large insofar as the length of each first subcore 1.1 extends so long as to span across the opposing axial sides of two adjacent second subcores 1.2 and / or adjacent second subcores 1.2, respectively, overlapping their lateral sides.

[0023] The core 1 is thus formed by a number of sub-cores 1.1, 1.2 arranged one behind the other. The core 1 has two opposite ends in the longitudinal direction 7, which are formed by corresponding ends or axial sides of the last first or second lower core 1.1, 1.2 in the longitudinal direction 7.

[0024] The coil 2 is wound around the core 1, preferably around the core support 4. The winding direction of the coil 2 is the longitudinal direction 7. The coil 2 preferably has a number of turns around the core 1, preferably more than 2, preferably more than 5, preferably more than 10, preferably more than 15, preferably more than 20 turns. The coil 2 preferably extends from the first end of the core 1 to the second end of the core 1, 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 constitutes at least 70%, preferably at least 75%, preferably at least 80% of the longitudinal extension of the core 1. The coil 2 preferably extends over both first subcores 1.1, preferably over the entire first subcore 1.1. The coil 2 or the coil wire of the coil 2 is preferably wound around the core support 4. However, the coil 2 or the coil wire (without the core support 4) may also be wound directly around the core 1. The coil 2 preferably comprises a coil wire wound around the core 1 or the core support 4. The coil wire is preferably insulated. The coil wire is preferably wound such that both ends of the coil wire are connected to the terminals of the antenna at one end of the core 1. In the embodiment shown, the coil 2 is wound in one direction from the first end of the core 1 to the second end of the core 1, and then the coil wire is returned from the second end of the core 1 to the first end of the core 1 (without being wound around the core 1). However, it may also be possible to first lead the coil wire from the first end of the core 1 to the second end of the core 1 (without being wound around the core 1) and then wind it from the second end of the core 1 to the first end of the core 1 to cover one direction. The coil wire may also be wound in both directions (cross-wound).

[0025] The core support 4 is formed to carry or hold the core 1. This is particularly important when assembling the antenna before potting, so that all antenna parts are held in the correct position before the antenna is encapsulated. The features of the core support 4 described below therefore relate to the antenna before resin is potted and cured, unless otherwise stated. The core support 4 is preferably formed to carry the coil 2. The core support 4 preferably has an internal opening in which the core 1 is held. The core support 4 preferably has an outer surface around which the coil 2 is wound. The core support 4 preferably fixes the position of the sub-cores 1.1, 1.2 relative to each other (at least in one direction). The core support 4 preferably fixes the sub-cores 1.1, 1.2 (at least in one direction, preferably in all directions, radially 330° about the longitudinal axis, preferably 350°, preferably radially in all directions about the longitudinal axis 7) so that they are perpendicular to the core 1 or sub-cores 1.1, 1.2. The coil 2 is preferably wound on the core support 4 or on the core 1 (without the core support 4) in such a way that the coil winding presses the two second subcores 1.2 against the first subcore 1.1 and fixes their position. In one embodiment, the subcores 1.1, 1.2 are inserted for assembly in the direction of the longitudinal axis of the core 1 or the subcores 1.1, 1.2. This allows the subcores 1.1, 1.2 to be stably arranged relative to one another and still be axially movable relative to one another. However, the subcores 1.1, 1.2 may also be inserted in the core support 4 differently, for example in the loading direction. The core support 4 preferably extends over at least 70%, preferably at least 80%, preferably at least 90% of the length of the core 1. This allows the subcores 1.1, 1.2 to be held in a stable state. This is advantageous for positioning during production and is stable when the subcores 1.1, 1.2 to be enclosed later are used. In the embodiment shown, the core support 4 has at least one, preferably two, parallel longitudinal supports 41 (extending in the direction of the longitudinal axis of the core 1). The core support 4 preferably has a number of cross supports 42 which prevent or arrest movement of the sub-cores 1.1, 1.2 in a radial direction relative to the longitudinal direction 7 of the core 1, in particular in a third direction 9.The winding of the coil 2 is preferably interrupted in the region of the transverse supports 42. Preferably, the transverse supports 43 are respectively connected to two longitudinal supports 4. For the sake of explanation, the four sides of the core 1 (perpendicular to the longitudinal axis of the core 1) are used as the upper side (or first side), the lower side (or second side) and two sides (third and fourth side), without limiting the invention to a particular orientation of the antenna. The upper side and the lower side are preferably opposite and / or the two sides are opposite. Preferably, there is an upper transverse support 42 against which the upper side of the core 1 abuts. Preferably, there is a lower transverse support 42 against which the lower side of the core 1 abuts. The two longitudinal supports 41 are preferably arranged on the two transverse sides of the core 1, which abut the two transverse sides of the core 1 against the two longitudinal supports. The core support 4 preferably has at one end a closing area 43 formed to close the opening of the housing 3 when the core support 4 (together with the core 1 and the coil 2) is attached to the housing 3. The closed area 43 may be formed integrally with the rest of the core support 4. However, the closed area 43 and the rest of the core support 4 may also be composed of separate parts (see the first and second embodiments). The closed area 43 preferably has a connection for the electrical connection of the antenna, in particular the coil 2. The connection preferably has two conductive rods extending through the closed area 43. One side of each conductive rod projects from the outer closed area 43, so that the completed antenna can be electrically connected. The other side of each conductive rod projects inside the closed area 43, and the end of the coil 2 or the coil wire is respectively connected to one of these conductive rods (inside). The core support 4 is preferably formed such that after assembly in the housing 3 the core support 4 has a predetermined position. On one side of the antenna this is solved, for example, by locating the closed area 43 in an opening in the housing 3. The core support 4 preferably also has positioning means that hold the core support 4 in a predetermined position when the core support 4 is attached to the housing 3. Another positioning means is preferably arranged in an area of ​​the core support 4 opposite the closed area 43. The positioning means preferably has a flexible / resilient arm which presses against the inner wall of the housing 3 and thus brings the core support 4 within the housing 3 into a predetermined position.The recoil of the positioning means dampens and protects the core 1 from shocks. The core support 4 is preferably made of plastic.

[0026] The housing 3 is formed to surround the core 1 with the coil 2. The housing 3 is preferably formed to surround the core support 4 with the core 1 and the coil 2. The housing 3 preferably has an opening formed so that the core 1 with the coil 2 or the core support 4 with the core 1 and the coil 2 can be inserted into the housing 3. The opening is preferably closed by the core support 4 in the inserted state. However, the opening may be closed with a separate cover.

[0027] The injection material 5 is placed between the housing 3 and the core 1 with the coil 2 or between the core 1 and the core support 4 with the coil 2. The core 1 with the coil 2 or the core support 4 with the core 1 and the coil 2 is inserted into the housing 3 and potted with the injection material 5. The injection material 5 is often referred to as potting. The injection material 5 preferably fills preferably all cavities in the housing 3, so that the heat is effectively dissipated from the core 1 and the coil 2 and the core 1 with the coil 2 or the core support 4 with the core 1 and the coil 2 and the coil 2 is stably contained. Preferably, a casting compound 5 is used which is softer than 60 Shore A (in the hardened state), preferably 40 Shore A, preferably 35 Shore A, preferably 30 Shore A, preferably 27 Shore A, preferably 25 Shore A. It has been found that the injection material 5 being softer than 60 Shore A or as other preferred values ​​mentioned not only improves the stability against fracture, but surprisingly also improves the stability of the electrical values ​​of the antenna. The casting compound 5 (in the cured state) is preferably harder than 10 Shore A, preferably harder than 15 Shore A. Casting compounds 5 having a deformation between 0 and 35 Shore A have proven to be particularly advantageous.

[0028] The described antenna 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 on the vehicle.

[0029] To manufacture the antenna, the sub-cores 1.1 and 1.2 are first placed on the core support 4 as described above. The coil 2 is wound on the core support 4. The coil wire is connected to the antenna connector. The core 1 with the coil 2 or the core support 4 with the core 1 and the coil 2 is inserted into the housing 3. The core 1 with the coil 2 or the core support 4 with the core 1 and the coil 2 is injected with an injection material 5 into the housing 3. The injection material 5 is then hardened to produce the antenna. The present application provides, for example, the following aspects: [Point 1] An antenna comprising a magnetic core (1) and a coil (2) wound around the magnetic core (1). and the magnetic core (1) has at least two first sub-cores (1.1) and at least The two first sub-cores (1.1) are arranged in front of and behind each other in the longitudinal direction (8) of the magnetic core (1). and each of the at least two first sub-cores (1.1) has a side and at least Both first subcores (1.1) are the first first subcore (1.1) and the second first subcore (1.1). In the antenna, The magnetic core (1) comprises at least one second sub-core (1.2) and at least one The second sub-core (1.2) comprises a first second sub-core (1.2), 1.2) is a first second sub-core (1.2) at least the first first sub-core (1.1) The first sub-core (1.1) also partially overlaps with the second first sub-core (1.2) and at least partially overlaps with the first first sub-core (1.3). Since it is arranged on the side of the sub-core (1.1) and the side of the second first sub-core (1.1), The second sub-core (1.2) of 1 is the first sub-core (1.1) to the second sub-core (1.2). Forming a magnetic bridge to (1.1) An antenna characterized by: [Point 2] The side of the first sub-core (1.1) forms a plane, and the second sub-core (1.1) The side of the first sub-core (1.2) forms a plane, and the second sub-core (1.3) has a side that forms a plane, and the first The second sub-core (1.2) of the first aspect is the first sub-core (1.1) aspect of the first aspect and the second 2. The antenna according to claim 1, mounted on a side of the first subcore (1.1). [Point 3] The side surfaces of the first sub-core (1.1) are arranged parallel to the longitudinal direction (7) of the core. And, The side faces of the second first sub-core (1.1) are arranged parallel to the longitudinal direction (7) of the core. And, The side faces of the first second sub-core (1.2) are arranged parallel to the longitudinal direction (7) of the core. And, The antenna according to aspect 1 or 2, wherein the antenna is at least one of the above. [Point 4] The longitudinal axis of the first sub-core (1.1) and the longitudinal axis of the second sub-core (1.1) At least one of the wires is arranged parallel to the longitudinal axis of the first second subcore (1.2). 4. The antenna of any one of aspects 1 to 3, [Point 5] The first sub-core (1.1) and the second sub-core (1.1) are The longitudinal axis of the core (1.1) is an extension of the longitudinal axis of the second first subcore (1.1). 5. The antenna of any one of aspects 1 to 4, wherein the antennas are arranged one behind the other. [Point 6] At least two first sub-cores (1.1) are arranged in a first plane and at least one second The two sub-cores (1.2) are arranged in a second plane, which is preferably parallel to the first plane. 6. The antenna according to any one of aspects 1 to 5. [Point 7] The first sub-core (1.1) has a rectangular cross section, and the second sub-core ( 1.1) has a rectangular cross section and / or The first second subcore has a rectangular cross section; The magnetic core (1) is made up of a first sub-core (1.1) and a first sub-core (1.2). The overlapping area again forms a rectangular cross section, The magnetic core (1) is a first sub-core (1.1) and a second sub-core (1.2). and / or the overlapping area again forming a rectangular cross section. 7. An antenna according to any one of claims 1 to 6. [Point 8] At least two first sub-cores (1.1) are provided with a third first sub-core (1.1), At least one second sub-core (1.2) comprises a second second sub-core (1.2), The second sub-core (1.2) is at least partially connected to the second first sub-core (1.3). so as to overlap at least partially with the first subcore (1.1) and the third first subcore (1.1), A second first sub-core (1.1) is disposed on a side of the second first sub-core (1.1) and a third first sub-core (1.1) is disposed on a side of the third first sub-core (1.1). 8. The antenna according to any one of claims 1 to 7. [Point 9] A core support (4) is provided, and the core support (4) includes at least two first subcores (1.1) and at least one Any of aspects 3 to 6, wherein the two second sub-cores (1.2) are held by a core support (4). The antenna according to any one of claims 1 to 5. [Point 10] 10. The antenna of claim 9, wherein the coil (2) is wound around a core support (4). [Point 11] The core support (4) and the coil (2) around the core support (4) are connected to each other by a winding of the coil (2). The wire is connected to at least one second subcore (1.2) and at least two first subcores (1.1 11. The antenna according to claim 10, wherein the antenna is formed so as to be pressed against a side of the [Point 12] The core support (4) extends over at least 80% of the length of the magnetic core (1). and a coil (2) extending over more than 80% of the length of the magnetic core (1). 12) is wound around a core support, any one of aspects 1 to 11. An antenna as described in one. [Point 13] The magnetic core (1) includes a housing (3) and an injection material (5) and is provided with a coil (2). , is placed in the housing (3), and is injected into the housing (3) with an injection substance (5), The input material (5) is softer than 60 Shore A, preferably softer than 40 Shore A; 13. An antenna according to any one of aspects 1 to 12. [Point 14] A vehicle equipped with an antenna according to any one of aspects 1 to 13, the antenna comprising: For transmitting key data for opening and / or starting the vehicle A vehicle configured to: [Point 15] A step of disposing a magnetic core (1); A method for manufacturing an antenna comprising the steps of: winding a coil around a magnetic core (1). 、 The magnetic core (1) has at least two first sub-cores (1.), and the magnetic core (1) The step of arranging includes arranging at least two sub-cores (1.1) in a longitudinal direction of the magnetic core (1). (8) comprising at least two first cores (1.1) arranged one behind the other; The manufacturing method includes a first subcore (1.1) and a second subcore (1.1). Leave, The magnetic core (1) comprises at least one second sub-core (1.2) and at least one The second sub-core (1.2) comprises a first second sub-core (1.2), The step of disposing the magnetic core (1) includes a step of disposing the first second sub-core (1.2). In this step, the first second sub-core (1.2) is at least partially and at least partially overlapping the second first subcore (1.1) Thus, the first second subcore (1.2) is a side of the first first subcore (1.1) and the second Since the first sub-core (1.1) is located on its side, the first second sub-core (1.2) forming a magnetic bridge from the first sub-core (1.1) to the second first sub-core (1.1); R, A method for manufacturing an antenna.

Claims

1. An antenna comprising a magnetic core (1) and a coil (2), the magnetic core (1) having at least two first sub-cores (1.1), the at least two first sub-cores (1.1) being arranged adjacent to each other in a longitudinal direction (7) of the magnetic core (1), each of the at least two first sub-cores (1.1) having a side surface, the at least two first sub-cores (1.1) comprising a first first sub-core (1.1) and a second first sub-core (1.1), the magnetic core (1) comprises at least one second subcore (1.2), the at least one second subcore (1.2) comprises a first second subcore (1.2), the first second subcore (1.2) overlaps at least partially with the first first subcore (1.1) and at least partially with the second first subcore (1.1) and is disposed on a side of the first first subcore (1.1) and a side of the second first subcore (1.1), so that the first second subcore (1.2) forms a magnetic bridge from the first first subcore (1.1) to the second first subcore (1.1); The at least two first subcores (1.1) and the at least one second subcore (1.2) are held by a core support (4), The coil (2) is wound around the core support (4), The core support (4) and the coil (2) in which the winding of the coil (2) is formed around the core support (4) by pressing the core support (4), An antenna, characterized in that the at least one second sub-core (1.2) is pressed against the sides of the at least two first sub-cores (1.1) to fix the positions of the at least one second sub-core (1.2) and the at least two first sub-cores (1.1).

2. An antenna as described in claim 1, wherein a side surface of the first first subcore (1.1) forms a plane, a side surface of the second first subcore (1.1) forms a plane, the first second subcore (1.2) has a side surface forming a plane, and a side surface of the first second subcore (1.2) rests on a side surface of the first first subcore (1.1) and a side surface of the second first subcore (1.1).

3. The side surface of the first sub-core (1.1) is arranged parallel to the longitudinal direction (7) of the magnetic core; and the side surface of the second first sub-core (1.1) is arranged parallel to the longitudinal direction (7) of the magnetic core; the side faces of the first second sub-core (1.2) are arranged parallel to the longitudinal direction (7) of the magnetic core; The antenna according to claim 1 or 2, which is at least one of the above.

4. An antenna described in any one of claims 1 to 3, wherein at least one of the longitudinal axis of the first first subcore (1.1) and the longitudinal axis of the second first subcore (1.1) is arranged parallel to the longitudinal axis of the first second subcore (1.2).

5. An antenna described in any one of claims 1 to 4, wherein the first first subcore (1.1) and the second first subcore (1.1) are arranged behind each other so that the longitudinal axis of the first first subcore (1.1) is an extension of the longitudinal axis of the second first subcore (1.1).

6. The at least two first subcores (1.1) are arranged in a first plane, said at least one second subcore (1.2) is arranged in a second plane; 6. An antenna as claimed in claim 1, wherein the second plane is parallel to the first plane.

7. At least one of the first subcore (1.1) having a rectangular cross-section and the second subcore (1.1) having a rectangular cross-section, the first second subcore has a rectangular cross section; In the magnetic core (1), the first sub-core (1.1) again forms a rectangular cross section in a region where the first sub-core (1.1) overlaps with the first second sub-core (1.2); 7. An antenna as claimed in any one of claims 1 to 6, wherein the magnetic core (1) again forms a rectangular cross section in the area where the second first subcore (1.1) overlaps with the first second subcore (1.2).

8. The at least two first sub-cores (1.1) include a third first sub-core (1.1), 8. The antenna of claim 1, wherein the at least one second subcore (1.2) comprises a second second subcore (1.2), the second second subcore being arranged on a side of the second first subcore (1.1) and a side of the third first subcore (1.1) such that the second second subcore (1.2) at least partially overlaps with the second first subcore (1.1) and at least partially with the third first subcore (1.1).

9. An antenna as described in any one of claims 1 to 8, wherein at least one of the core support (4) extends over at least 80% of the length of the magnetic core (1) and the coil (2) is wound around the core support so that the coil (2) extends over more than 80% of the length of the magnetic core (1).

10. A housing (3) and an injection substance (5), The magnetic core (1) with the coil (2) is disposed in the housing (3) and is injected into the housing (3) with the injection material (5), 10. An antenna according to any one of the preceding claims, wherein the potting material (5) is softer than 60 Shore A.

11. A vehicle comprising an antenna according to any one of claims 1 to 10, said antenna being configured for the transmission of key data for opening and / or starting the vehicle.

12. Placing the magnetic core (1) in a core support (4); and winding a coil around the core support (4) on which the magnetic core (1) is disposed, In the manufacturing method, the magnetic core (1) comprises at least two first sub-cores (1.1), and the step of arranging the magnetic core (1) comprises arranging the at least two first sub-cores (1.1) adjacent to each other in a longitudinal direction (7) of the magnetic core (1), the at least two first sub-cores (1.1) comprising a first first sub-core (1.1) and a second first sub-core (1.1), The magnetic core (1) comprises at least one second sub-core (1.2), the at least one second sub-core (1.2) comprises a first second sub-core (1.2), the step of arranging the magnetic core (1) comprises a step of arranging the first second subcore (1.2), in which the first second subcore (1.2) is arranged on a side of the first first subcore (1.1) and a side of the second first subcore (1.1) such that the first second subcore (1.2) at least partially overlaps the first first subcore (1.1) and at least partially overlaps the second first subcore (1.1), so that the first second subcore (1.2) forms a magnetic bridge from the first first subcore (1.1) to the second first subcore (1.1); The at least two first subcores (1.1) and the at least one second subcore (1.2) are held on a core support (4), The coil (2) is wound around the core support (4), The core support (4) and the coil (2) in which the winding of the coil (2) is formed around the core support (4) by pressing the core support (4), A method for manufacturing an antenna, comprising the steps of pressing the at least one second subcore (1.2) against the side surfaces of the at least two first subcores (1.1) in succession to fix the positions of the at least one second subcore (1.2) and the at least two first subcores (1.1).

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