Antenna

Abstract

To provide an antenna that is robust, easy to manufacture, and has good and stable antenna characteristics.SOLUTION: The antenna includes a housing 3, cores 1.1, 1.2, and a coil 2 wound around the cores. An injectable substance 5, which is softer than 40 Shore A, is disposed between a housing and the core with the coil or between the core and core supports (longitudinal support 41, lateral support 42) provided with the coil.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an antenna, and more particularly to an antenna formed for transmitting key data for opening and / or starting a vehicle and for use in a vehicle.

Background Art

[0002] An antenna typically consists of a ferromagnetic core and a coil. The antenna is usually injected into a housing. Depending on the transmission frequency and bandwidth, it is necessary to appropriately design the core and the coil. The bandwidth of the antenna is getting wider. For example, in the case of a UWB antenna, the range of the antenna is expanding. This means, for example, that the core is longer. Also, a long core is more likely to be damaged than a short core, and the manufacturing cost is higher.

[0003] Therefore, for example, in Patent Document 1, Patent Document 2, and Patent Document 3, it is known to form a core by a plurality of sub-cores arranged vertically. This has the advantage that the manufacturing of individual sub-cores is easy and the susceptibility to damage of the sub-cores is reduced. However, it has been shown that the magnetic characteristics of the core formed from a plurality of sub-cores are very susceptible to the influence of shock and temperature fluctuations, and these antennas often have problems with the stability of antenna characteristics.

[0004] Basically, it is possible to use a softer injection resin that better absorbs shock and thereby reduces the susceptibility to damage. However, there are strict quality requirements for the positioning of antenna components, and since the allowable error in the positioning of antenna components is very small, the stability of the electrical characteristics of the antenna is not necessarily impaired. Therefore, it is selected that the injection substance is not too soft.

[0005] In Patent Document 4, an alternative approach is adopted. Here, since the magnetic fiber body is embedded in a non-magnetic flexible substance, a flexible magnetic core is created. However, these flexible magnetic cores have inferior magnetic characteristics compared to conventional (rigid) magnetic cores.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

Patent Document 2

Patent Document 3

Patent Document 4

Summary of the Invention

Problems to be Solved by the Invention

[0007] The problem of the present invention is to find an antenna that is robust, easy to manufacture, and has good and stable antenna characteristics.

Means for Solving the Problems

[0008] According to the present invention, this problem is achieved by the antenna described in the independent claims and the manufacturing method of the antenna.

[0009] When using an injection material 5 that is softer than 40 Shore A, a very robust antenna is created due to very excellent attenuation. Surprisingly, the characteristics of the antenna are also very stable. This is probably because in the case of a harder injection material 5, the injection material 5 or the positioning means is damaged by impact, resulting in a permanent inaccurate positioning of the antenna or antenna components. Since a very soft injection material is used, the displacement of the antenna components within the injection material is very short, and the antenna components return to their original same positions. According to the present invention, a slight excess of the specified tolerance is allowed in order to improve the long-term stability of the antenna. Therefore, a very soft injection material creates a very robust antenna with very excellent electrical characteristics.

[0010] Instead, this problem is further achieved by an antenna having a core and a coil wound around the core and comprising one or a combination of the following features. This antenna may be without an injection substance or a harder injection substance may be used. Further advantageous embodiments are specified in the dependent claims.

[0011] In one embodiment, the injection substance is softer than 35 Shore A, preferably softer than 30 Shore A, preferably softer than 27 Shore A, preferably softer than 25 Shore A. This hardness of the injection substance gives a better value for stability against breakage and stability of electrical values. In one embodiment, the injection substance is harder than 10 Shore A, preferably 15 Shore A. In the range exceeding this 10 or 15 Shore A, an optimized one between stability against breakage and electrical stability is achieved.

[0012] In one embodiment, the core has a plurality of sub-cores, and the plurality of sub-cores have a first sub-core and a second sub-core. The plurality of sub-cores simplifies the manufacture of the core and improves fracture stability. For embodiments particularly with sub-cores, a soft injection material is advantageous. The soft injection material has been found to have little effect on the electrical variables of the antenna because it has little effect on the relative positions of the two sub-cores after impact. In one embodiment, the first sub-core is disposed at a distance from the second sub-core. This has proven to be particularly advantageous in combination with a soft injection material. The soft injection material allows the sub-cores to have a certain degree of freedom of movement when impacted. When the sub-cores contact each other, the impact is transmitted from the first sub-core to the second sub-core, increasing the likelihood of damage to the sub-cores despite the soft casting compound. This is avoided by the gap between the sub-cores. When the sub-cores are in contact, the magnetic properties of the entire core depend significantly on the force with which the two sub-cores are pushed together. The soft injection material can cause a significant change in the contact pressure between the two sub-cores and even lead to the separation of the sub-cores. This variation in contact pressure can also be caused by vibrations, impacts, or temperature variations. This leads to significant electrical instability of the antenna, which is undesirable. Therefore, when using a soft injection material in combination with a plurality of sub-cores, it is particularly advantageous to use a gap between the sub-cores. This significantly improves the thermal and electrical stability of the antenna. In one embodiment, the gap formed by the distance is filled with the injection material. Therefore, the injection material between the sub-cores also functions as a buffer and conducts heat between the sub-cores to the remaining injection material.

[0013] In one embodiment, the first sub-core has a first longitudinal axis and the second sub-core has a second longitudinal axis. In one embodiment, the first sub-core and the second sub-core are arranged such that the second longitudinal axis extends as an extension of the first longitudinal axis. In one embodiment, the first sub-core has a first cross-section perpendicular to the first longitudinal axis, and the second sub-core has a second cross-section perpendicular to the second longitudinal axis. In one embodiment, the second cross-section corresponds to the first cross-section. In one embodiment, the first sub-core and the second sub-core are arranged such that the first cross-section is disposed on the same plane as the second cross-section. In one embodiment, the first sub-core has the same first cross-section along the entire length of the first longitudinal axis. In one embodiment, the second sub-core has the same second cross-section along the entire length of the second longitudinal axis.

[0014] In one embodiment, the first sub-core has a first end and a second end opposite the first end. In one embodiment, the second sub-core has a first end and a second end opposite the first end. In one embodiment, the first end of the first sub-core is opposite to arranged with the first end of the second sub-core.

[0015] In one embodiment, the antenna has a core support. The core support prevents certain movements of the core that are desirable for electrical stability and allows other movements that are desirable for electrical and fracture stability. In one embodiment, the core support carries the first and second sub-cores. The core support is particularly advantageous in exemplary embodiments with two sub-cores, especially cores with a gap.

[0016] In one embodiment, the core support extends from the second end of the first sub-core to the second end of the second sub-core (e.g., excluding the protruding ends of the sub-cores up to a maximum of 10% of the length of core 1, preferably a maximum of 5%). This enables the sub-cores to be firmly held over the length of core 1.

[0017] In one embodiment, the coil is wound around the core support. This has the advantage that the sub-cores are kept stable during winding of the coil. In one embodiment, the coil is wound such that it exceeds 80% of the length between the second ends of the sub-cores.

[0018] In one embodiment, before the sub-core, the core support, and the coil are injected into the housing together with the injection material, the core support is formed to insert the first sub-core and / or the second sub-core in the direction of the longitudinal axis of the corresponding sub-core of the core support for assembly.

[0019] In one embodiment, before the sub-core, the core support, and the coil are injected into the housing together with the injection material, the core support with the assembled sub-core and the coil are formed, and the first sub-core and / or the second sub-core are formed to be moved in the direction of the longitudinal axis of the corresponding sub-core.

[0020] In one embodiment, before the sub-core, the core support, and the coil are injected into the housing together with the injection material, the core support and the coil are made, and the first sub-core and / or the second sub-core are placed perpendicular to the longitudinal axis of the corresponding sub-core so as to fix the corresponding sub-core.

[0021] In one embodiment, the positions of the core support, the coil, the first sub-core, and / or the second sub-core are fixed in the housing by the injection material.

[0022] In one embodiment, the antenna is formed for transmitting at least one of key data for use in a vehicle and for opening and / or starting the vehicle.

[0023] In one embodiment, the vehicle includes the above-described antenna.

[0024] The present invention will be described in more detail with reference to the accompanying drawings.

Brief Description of the Drawings

[0025] [Figure 1] It is a perspective view of a first embodiment of an antenna provided with a half-cut housing and an injection material. [Figure 2] It is a perspective view of a first embodiment of an antenna without a housing and an injection material. [Figure 3] It is a perspective view of a first embodiment of an antenna without a core support, a housing, and an injection material. [Figure 4] It is a first cross-sectional view passing through the antenna according to the first embodiment. [Figure 5]It is a plan view of the antenna according to the first embodiment. [Figure 6] It is a second cross-sectional view of the antenna according to the first embodiment along line D-D. [Figure 7] It is a second cross-sectional view of the antenna according to the first embodiment along line E-E. [Figure 8] It is an enlarged view of cross-section F in FIG. 1.

Mode for Carrying Out the Invention

[0026] FIGS. 1 to 8 show an embodiment of the present invention. The antenna includes a core 1, a coil 2, a housing, a core support 4, and an injection substance 5.

[0027] The core 1 is a magnetic core. The core 1 preferably extends along the longitudinal axis. The core 1 is preferably longer in the direction of the longitudinal axis than in other directions or axes (perpendicular to the longitudinal axis). The core 1 is made of a magnetic material. The core is preferably made of a ferrite material (ferrite material) or a powder material (powder core), for example, a ferrite material. Magnetic material means that the material is at least paramagnetic, preferably ferromagnetic. The magnetic core 1 is made of a hard material. That is, the magnetic core 1 is neither elastic nor flexible. The magnetic core 1 preferably has a rectangular cross-section.

[0028] The magnetic core preferably consists of a plurality of sub-cores 1.1 and 1.2. The material properties of the above-mentioned core 1 are applied according to each sub-core 1.1, 1.2. The same magnetic material is preferably used for different sub-cores 1.1 and 1.2. The plurality of sub-cores 1.1 and 1.2 have at least two sub-cores 1.1 and 1.2 including a first sub-core 1.1 and a second sub-core 1.2. The first sub-core has a first longitudinal axis. The second sub-core has a second longitudinal axis. The first sub-core 1.1 and the second sub-core 1.2 are preferably arranged such that the second longitudinal axis extends along the extension of the first longitudinal axis (therefore, the first longitudinal axis and the second longitudinal axis form the longitudinal axis of the core 1). This means that at least one of the first longitudinal axis and the second longitudinal axis is not twisted with respect to each other, is arranged at 0° or 180°, and is parallel, coaxial, or overlapping with each other. The first sub-core 1.1 has a first end and a first end opposite to (in the direction of the first longitudinal axis) opposite 2 end. The second sub-core 1.2 has a first end and a second end (in the direction of the second longitudinal axis) opposite to the first end. The first end of the first sub-core 1.1 is preferably arranged opposite to with the first end of the second sub-core 1.2. Therefore, the second end of the first sub-core 1.1 forms the first end of the core 1, and when the core 1 is composed of two sub-cores 1.1, 1.2, the second end of the second sub-core 1.2 forms the second end of the core 1. The first sub-core 1.1 has a first cross-section perpendicular to the first longitudinal axis. The second sub-core 1.2 has a second cross-section perpendicular to the second longitudinal axis. The second cross-section preferably corresponds to the first cross-section. The first sub-core 1.1 and the second sub-core 1.2 are preferably arranged such that the first cross-section of the first sub-core 1.1 is the second cross-section of the second sub-core 1.2 exactly overlappingThey are arranged as follows. This means that the second sub-core 1.2 forms an extension of the first sub-core 1.1 along the first or second longitudinal axis, and both sub-cores 1.1 have the same cross-section as the coaxially arranged longitudinal axis (when arranged in a non-rotationally symmetric cross-section, the cross-sections completely overlap). The first sub-core 1.1 preferably has the same first cross-section along the entire first longitudinal axis. The second sub-core 1.2 preferably has the same second cross-section along the entire second longitudinal axis. The first sub-core 1.1 and the second sub-core 1.2 are preferably identical, so that the same parts may be used for both sub-cores 1.1 and 1.2. The first sub-core 1.1 is preferably arranged at a distance from the second sub-core 1.2. As a result, first a gap is created between the sub-core 1.1 and second the sub-core 1.2. The distance between the first sub-core 1.1 and the second sub-core 1.2 is preferably greater than 0.1 mm, preferably greater than 0.3 mm, preferably greater than 0.5 mm, preferably greater than 1 mm. Since a gap that is too large may adversely affect the magnetic field lines between the two sub-cores 1.1 and 1.2, the gap is preferably less than 10 mm, preferably less than 7 mm, preferably less than 5 mm.

[0029] Coil 2 is wound around core 1. Coil 2 preferably has a plurality of turns around core 1, preferably more than two, preferably more than five, preferably more than ten, preferably more than fifteen, preferably more than twenty turns. Coil 2 preferably extends from the first end of core 1 or the second end of the first sub-core 1.1 to the second end of core 1 or the second end of the second sub-core 1.2, and the region between the last turn of coil 2 in the direction of the first end of core 1 or the second end of the first sub-core 1.1 and the last turn of coil 2 in the direction of the second end of core 1 or the second end of the second sub-core 1.2 preferably does not cover at least 70%, preferably 75%, preferably 80% of the longitudinal extension of core 1 or the two sub-cores 1.1, 1.2. Coil 2 preferably extends across both sub-cores 1.1, 1.2. Coil 2 preferably extends across both sub-cores 1.1, 1.2. Coil 2 or the coil wire of coil 2 is preferably wound around the core support 4. However, coil 2 or the coil wire (without core support 4) may be directly wound around core 1. Coil 2 preferably has a coil wire wound around core 1 or core support 4. The coil wire is preferably insulated. However, the coil wire may be non-insulated. However, care must be taken so that the wires do not touch each other when crossing and do not touch core 1. 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 core 1. In the illustrated embodiment, coil 2 is wound in one direction from the first end of core 1 to the second end of core 1, and then the coil wire is returned from the second end of core 1 towards the first end of core 1 (without being wound around core 1). However, it is also possible to first lead the coil wire from the first end of core 1 to the second end of core 1 (without winding around core 1) and then wind it from the second end of core 1 to the first end of core 1 in one direction to cover it. The coil wire may be wound in both directions (cross winding).

[0030] The core support 4 is formed to hold / retain the core 1. This is particularly important when assembling the antenna before resin injection, ensuring that all antenna components are held in the correct position before the antenna is encapsulated. Thus, the functions of the core support 4 described below relate to the state before resin injection of the antenna, unless otherwise specified. 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 is particularly advantageous in an exemplary embodiment comprising a plurality of sub-cores 1.1, 1.2. The core support 4 preferably fixes the positions 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 perpendicular to the core 1 or the sub-cores 1.1, 1.2 (at least in one direction, preferably in all directions, radially 330°, preferably 350°, preferably in all directions in the radial direction of the longitudinal axis). Preferably, when two sub-cores 1.1, 1.2 are attached to the core support 4 and the coil 2 is wound around the core 1 on the core support 4, at least one (or both) of the two sub-cores 1.1, 1.2 is movable in the direction of the longitudinal axis. Thus, by adjusting the distance between the two sub-cores 1.1, 1.2, the antenna assembled before resin injection can be finely adjusted to achieve the desired antenna characteristics. However, the two sub-cores 1.1, 1.2 may be completely fixed so that the sub-cores 1.1, 1.2 cannot move (absolutely and / or relative to each other). The sub-cores 1.1, 1.2 are preferably introduced in the direction of the longitudinal axis of the core 1 or the sub-cores 1.1, 1.2 for assembly. This allows the sub-cores 1.1, 1.2 to be stably arranged relative to each other while still being axially movable relative to each other. However, the sub-cores 1.1, 1.2 may be inserted into the core support 4 in different ways. The core support 4 preferably extends from the second end of the first sub-core to the second end of the second sub-core. This enables stable attachment of the sub-cores 1.1, 1.2. This is advantageous for positioning during manufacturing and also stabilizes the encapsulated sub-cores 1.1, 1.2 during use.In the illustrated exemplary embodiment, 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 plurality of transverse supports 42 that prevent or block the movement of the sub-cores 1.1, 1.2 in the radial direction with respect to the longitudinal axis of the core 1. The winding of the coil 2 is preferably interrupted in the region of the transverse supports 42. In particular, each of the transverse supports 42 connects two longitudinal supports 41. For the sake of explanation, four sides of the core 1 (perpendicular to the longitudinal axis of the core 1) are used as the upper side (or the first side), the lower side (or the second side), and two side portions (the third and second sides), but the present invention is not limited to a specific orientation of the antenna. Preferably, at least one of the upper side and the lower side facing each other and the two side faces facing each other. Preferably, there is an upper transverse support 42 that abuts against the upper side of the core 1. Preferably, there is a lower transverse support 42 that abuts against the lower side of the core 1. The two longitudinal supports are preferably arranged on two sides of the core 1, and the two lateral sides of the core 1 abut against the two longitudinal supports. The core support 4 preferably has a closed region 43 formed at one end so as to close the opening of the housing 3 when the core support 4 is attached to the housing 3 (together with the core 1 and the coil 2). The closed region 43 may be formed integrally with the rest of the core support 4. However, the closed region 43 and the remaining core support 4 may be composed of separate parts. The closed region 43 preferably has a connection for the electrical connection of the antenna, particularly the coil 2. The connection preferably has two conductive rods extending through the closed region 43. One side of each conductive rod protrudes from the outer closed region 43, so that the completed antenna can be electrically connected. The opposite side of each conductive rod protrudes inside the closed region 43, and the ends of the coil 2 or the coil wire are respectively connected to one (inner) of these conductive rods. The core support 4 is preferably formed such that the core support 4 has a predetermined position after assembly to the housing 3. On one side of the antenna, this is solved, for example, by arranging the closed region 43 in the opening of the housing 3.The core support 4 preferably also has positioning means 44 that holds the core support 4 in a predetermined position when the core support 4 is attached to the housing 3. The positioning means 44 is preferably arranged in a region of the core support 4 on the side opposite to the closed region 43. The positioning means 44 is preferably elastic, and the positioning means 44 defines a predetermined position but is adapted to deviate from the predetermined position in the case of vibration or impact. The positioning means 44 preferably has a flexible or elastic arm 44 that presses against the inner wall of the housing 3 and thus positions the core support 4 within the housing 3 in a predetermined position. This is shown in cross-sections D-D and E-E of FIGS. 6 and 7. The core support 4 is preferably made of plastic.

[0031] The housing 3 is formed so as to surround the core 1 with the coil 2. The housing 3 is preferably formed so as to surround the core support 4 with the core 1 and the coil 2. The housing 3 preferably has an opening formed so as to insert the core 1 provided with the coil 2, or the core support 4 provided with the core 1 and the coil 2, into the housing 3. The opening is preferably closed by the inserted core support 4. However, the opening may be closed with another cover.

[0032] The injection material 5 is arranged 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 injected with the injection material 5. The injection material 5 is often called potting. The injection material 5 preferably fills all the gaps, preferably within the housing 3, so that heat is effectively dissipated from the core 1, the coil 2, and the core 1 with the coil 2 or the core support 4 with the core 1, and the coil 2 is stably stored. According to the present invention, an injection material 5 that is softer than 40 Shore A, preferably 35 Shore A, preferably 30 Shore A, preferably 27 Shore A, preferably 25 Shore A (in the cured state) is used. It has been found that the injection material 5 that is softer than 40 Shore A or the mentioned preferred values not only improves the stability against breakage but also surprisingly improves the stability of the electrical values of the antenna. The injection material 5 (in the cured state) is preferably harder than 10 Shore A and preferably harder than 15 Shore A. It has been found that an injection material 5 having a deformation between 10 and 40 Shore A is particularly advantageous.

[0033] To manufacture the antenna, first the core 1 is attached to the core support 4 together with the sub-cores 1.1, 1.2 in some cases. The coil 2 is wound around the core support 4 or the core 1. 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 the injection material 5 into the housing 3. Then, the injection material 5 cures and the antenna is completed. The present application provides, for example, the following viewpoints. [Viewpoint 1] An antenna comprising a housing (3), a core (1), and a coil (2) wound around the core (1), wherein the core (1) having the coil (2) is stored in an injection substance (5) within the housing (3). The injection substance (5) is an antenna characterized by being softer than 40 Shore A. [Viewpoint 2] The injection substance (5) is softer than 30 Shore A, the antenna according to Viewpoint 1. [Viewpoint 3] The core (1) comprises a plurality of sub-cores (1.1, 1.2), and the plurality of sub-cores (1.1, 1.2) comprises a first sub-core (1.1) and a second sub-core (1.2), the antenna according to Viewpoint 1 or 2. [Viewpoint 4] The first sub-core (1.1) has a first longitudinal axis, the second sub-core (1.2) has a second longitudinal axis, and the first sub-core (1.1) and the second sub-core (1.2) are arranged such that the second longitudinal axis extends as an extension of the first longitudinal axis, the antenna according to Viewpoint 3. [Viewpoint 5] The first sub-core (1.1) has a first cross-section perpendicular to the first longitudinal axis, the second sub-core (1.2) has a second cross-section corresponding to the first cross-section and perpendicular to the second longitudinal axis, the first sub-core (1.1) and the second sub-core (1.2) are arranged such that the first cross-section is arranged on the same plane as the second cross-section, and at least one of the first sub-core (1.1) having the same first cross-section along the entire first longitudinal axis and / or the second sub-core (1.2) having the same second cross-section along the entire second longitudinal axis is the antenna according to Viewpoint 4. [Viewpoint 6] The first sub-core (1.1) is arranged at a distance from the second sub-core (1.2), and the gap formed by the distance is filled with the injection substance (5), the antenna according to Viewpoint 4 or 5. [Viewpoint 7] Having a core support (4), and the first sub-core (1.1) and the second sub-core (1.2) are held by the core support (4), the antenna according to any one of Viewpoints 3 to 6. [Viewpoint 8] The first sub-core (1.1) has a first end and a second end opposite to the first end, the second sub-core (1.2) has a first end and a second end opposite to the first end, the first end of the first sub-core (1.1) is arranged opposite to the first end of the second sub-core (1.2), The core support (4) is the antenna according to aspect 7, extending from the second end of the first sub-core (1.1) to the second end of the second sub-core (1.2). [Aspect 9] The coil is wound around the core support, and preferably, the coil is wound so as to extend beyond 80% of the length between the second ends of the sub-cores. The antenna according to aspect 7 or 8. [Aspect 10] The core support (4) having the assembled sub-cores (1.1, 1.2) and the coil (2) is formed such that at least one of the first sub-core (1.1) and the second sub-core (1.2) is moved in the direction of the longitudinal axis of the corresponding sub-core (1.1, 1.2) before the injection substance (5) is injected into the housing (3) with the sub-cores (1.1, 1.2), the core support (4), and the coil (2). The antenna according to any one of aspects 7 to 9. [Aspect 11] The core support (4) having the assembled sub-cores (1.1, 1.2) and the coil (2) is configured such that the first sub-core (1.1) and / or the second sub-core (1.2) is fixed at a right angle to the direction of the longitudinal axis of the corresponding sub-core (1.1, 1.2) before the injection substance (5) is injected into the housing (3) with the sub-cores (1.1, 1.2), the core support (4), and the coil (2). The antenna according to any one of aspects 7 to 10. [Aspect 12] The antenna according to any one of aspects 7 to 11, wherein at least one position of the core support (4), the coil (2), the first sub-core (1.1), and the second sub-core (1.2) is fixed in the housing (3) by the injection substance (5). [Aspect 13] The antenna according to any one of aspects 1 to 12 is used in a vehicle, which is formed to transmit at least one of the data of the key for opening the vehicle and the data of the key for starting the vehicle. [Aspect 14] A vehicle provided with the antenna according to aspect 14. [Aspect 15] A step of injecting the core (1) around which the coil (2) is wound into the housing (3) with the injection substance (5); A step of curing the injection substance (5). In the manufacturing method of the antenna, The manufacturing method of the antenna, characterized in that the cured injection substance (5) is softer than 40 Shore A.

Claims

1. An antenna comprising a housing (3), a core (1), and a coil (2) wound around the core (1), wherein the core (1) with the coil (2) is stored in an injection substance (5) within the housing (3), wherein the core (1) comprises a plurality of sub-cores (1.1, 1.2), and each of the plurality of sub-cores (1.1, 1.2) comprises a first sub-core (1.1) and a second sub-core (1.2), the first sub-core (1.1) has a first longitudinal axis, the second sub-core (1.2) has a second longitudinal axis, and the first sub-core (1.1) and the second sub-core (1.2) are arranged such that the second longitudinal axis is collinear with the first longitudinal axis, the first sub-core (1.1) is arranged at a distance from the second sub-core (1.2), and the gap formed by the distance is filled with the injection substance (5), the injection substance (5) is softer than 40 Shore A, the antenna has the core support (4) that holds the first sub-core (1.1) and the second sub-core (1.2) within the core support (4), in the core support (4) having the assembled first sub-core and the second sub-core (1.1, 1.2) and the coil (2), before the injection substance (5) is injected into the housing (3) with the first sub-core and the second sub-core (1.1, 1.2) and the core support (4) and the coil (2), at least one of the first sub-core (1.1) and the second sub-core (1.2) is movable in the direction of the longitudinal axis of the corresponding sub-core (1.1, 1.2), characterized by an antenna.

2. The antenna according to claim 1, wherein the injection substance (5) is softer than 30 Shore A.

3. The first sub-core (1.1) has a first cross-section perpendicular to the first longitudinal axis, and the second sub-core (1.2) has a second cross-section corresponding to the first cross-section and perpendicular to the second longitudinal axis, the first sub-core (1.1) has the same first cross-section along the entire first longitudinal axis, and the second sub-core (1.2) has the same second cross-section along the entire second longitudinal axis, the antenna according to claim 1 or 2.

4. The first sub-core (1.1) has a first end and a second end opposite to the first end, and the second sub-core (1.2) has a first end and a second end opposite to the first end. The first end of the first sub-core (1.1) is disposed opposite to the first end of the second sub-core (1.2). The antenna according to any one of claims 1 to 3, wherein the core support (4) extends from the second end of the first sub-core (1.1) to the second end of the second sub-core (1.2).

5. The antenna according to any one of claims 1 to 4, wherein the coil is wound around the core support and is wound such that the coil extends more than 80% of the length between the second ends of the sub-cores.

6. The antenna according to any one of claims 1 to 5, wherein at least one of the positions of the core support (4), the coil (2), the first sub-core (1.1), and the second sub-core (1.2) is fixed in the housing (3) by the injection material (5).

7. The antenna according to any one of claims 1 to 6, which is formed to transmit at least one of data of a key for opening a vehicle and data of a key for starting a vehicle and is used in a vehicle.

8. A vehicle comprising the antenna according to claim 7.

9. Injecting a core (1) around which a coil (2) is wound into a housing (3) by an injection material (5); Hardening the injection material (5); in a method for manufacturing an antenna, The core (1) includes a plurality of sub-cores (1.1, 1.2), and each of the plurality of sub-cores (1.1, 1.2) includes a first sub-core (1.1) and a second sub-core (1.2). The method for manufacturing the antenna includes The first sub-core (1.1) has a first longitudinal axis, the second sub-core (1.2) has a second longitudinal axis, and arranging the first sub-core (1.1) and the second sub-core (1.2) such that the second longitudinal axis is collinear with the first longitudinal axis; Disposing the first sub-core (1.1) at a distance from the second sub-core (1.2); Filling a gap formed by the distance with the injection material (5); and the hardened injection material (5) is softer than 40 Shore A. Providing a core support (4) for holding the first sub-core (1.1) and the second sub-core (1.2); The core support (4) having the assembled first sub-core and second sub-core (1.1, 1.2) and the coil (2) is such that at least one of the first sub-core and the second sub-core (1.1, 1.2) is movable in the direction of the longitudinal axis of the corresponding sub-core (1.1, 1.2) before the injection material (5) is injected into the housing (3) with the first sub-core and the second sub-core (1.1, 1.2), the core support (4), and the coil (2); A method for manufacturing an antenna, characterized thereby.

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