EP4104241A1 - Sendevorrichtung für ein kraftfahrzeug zum aussenden eines funksignals sowie funkschlüsselsystem und kraftfahrzeug - Google Patents
Sendevorrichtung für ein kraftfahrzeug zum aussenden eines funksignals sowie funkschlüsselsystem und kraftfahrzeugInfo
- Publication number
- EP4104241A1 EP4104241A1 EP21703426.3A EP21703426A EP4104241A1 EP 4104241 A1 EP4104241 A1 EP 4104241A1 EP 21703426 A EP21703426 A EP 21703426A EP 4104241 A1 EP4104241 A1 EP 4104241A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coil antenna
- motor vehicle
- transmission
- frequency
- circuit
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
-
- 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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/08—Helical antennas
-
- 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
- Transmission device for a motor vehicle for transmitting a radio signal as well as a radio key system and a motor vehicle
- the invention relates to a transmission device for a motor vehicle in order to be able to emit a radio signal.
- the transmission device can, for example, be part of a radio key system. It comprises a coil antenna and the driver circuit for driving the current in the coil antenna.
- the invention also includes said radio key system and a motor vehicle with such a radio key system. Such systems are known per se and are also used as an industry standard.
- a radio signal of a predetermined transmission frequency is emitted by means of an antenna, it is generally difficult with a conventional antenna to avoid so-called harmonics, that is to say transmission signals with an integral multiple of the transmission frequency. Such harmonics can then interfere with reception in other frequency bands.
- a so-called coil antenna typically a coil with a ferrite core
- an antenna with a coil-shaped or helical-wound electrical conductor for example a wire.
- the area of a printed circuit board is then not available here in order to be able to provide an additional electrical conductor structure for a bandstop filter for suppressing harmonics.
- the invention is based on the object of attenuating resonance properties or vibration properties at a multiple of the transmission frequency in a transmission device with a coil antenna so that radio signals interfering with these harmonics are only emitted with less than a predeterminable transmission power.
- the invention provides an arrangement comprising a coil antenna and a driver circuit, which are referred to here together as a transmitting device.
- This transmission device is set up to transmit a radio signal, in particular electromagnetic radio waves or an alternating magnetic field, from a motor vehicle.
- Said coil antenna is provided for radiating the radio signal, that is to say an antenna with an electrically conductive coil wire that is wound or shaped in a coil-like or helical manner or with an electrical conductor track with a flat-coil shape.
- the electrical conducting element of the coil antenna is referred to below.
- the coil shape results in a coil.
- This coil of the coil antenna can be arranged on a ferrite core in a manner known per se.
- the electrical driver circuit is designed to generate an alternating electrical current at a predetermined transmission frequency in order to produce the radio signal in the coil antenna.
- this transmission frequency is the carrier frequency for a transmission signal that is to be emitted by the radio signal.
- the alternating current thus has, in the known manner, not only the transmission frequency itself, but frequencies of a transmission frequency band in which the transmission frequency lies.
- non-linearities in the driver circuit can result in addition to the aforementioned harmonics or so-called harmonics when operating the coil antenna, i.e. signal components with a frequency that is an integral multiple of the transmission frequency can also be generated in the radio signal.
- the coil antenna is arranged on at least one carrier element.
- the coil antenna can be arranged or plugged into the said ferrite core and / or it can be surrounded on the outside by, for example, a hose or a housing.
- the material of the carrier element that is to say the carrier material, is preferably an electrical insulator, but with a known value of the dielectric constant, or a ferrite.
- a parasitic inductance results parallel to the self-inductance of the coil antenna Parallel capacitance, the value of which depends on the said design parameters (material type and / or geometry).
- the invention now takes advantage of the fact that due to the shape of the electrical conducting element of the coil antenna and the proximity or presence of the carrier material of the carrier element, the coil antenna not only has a self-inductance, but also (due to the dielectricity) a parasitic capacitance arises, which as a capacitance layer along the Coil antenna can act. It thus acts as a parallel capacitance acting parallel to the self-inductance. From the point of view of the driver circuit, however, in relation to the feed point for feeding the alternating current into the coil antenna, the parallel capacitance together with the self-inductance result in a total parallel resonant circuit with a predetermined natural resonance frequency.
- Such a parallel resonant circuit now acts as a bandstop filter, that is, viewed from the driver circuit, an alternating current or an alternating voltage with a predetermined frequency corresponding to this natural resonance frequency cannot be transmitted into the coil antenna, or only attenuated. Due to the geometry of the carrier element and / or the material type of the carrier material and / or the geometry of the coil shape on the carrier element, a value of the natural resonance frequency is set to an integral multiple of the transmission frequency.
- the geometric design and / or the choice of material for the carrier element and the coil antenna are used to tune or set the parallel resonant circuit implicitly resulting from the self-inductance of the coil antenna itself and the parasitic parallel capacitance in such a way that the resulting bandstop filter is a harmonic or a The harmonic of the transmission frequency is suppressed or attenuated.
- the invention thus results in the advantage that even with a coil antenna, which does not have to be arranged on a printed circuit board, a bandstop filter for at least one harmonic or harmonic of the transmission frequency can even be provided in additional space.
- the inherent parallel resonant circuit is designed or designed with a natural resonance frequency so that its bandstop effect comprises an integral multiple of the transmission frequency or this integral multiple is in the bandstop range of the parallel resonant circuit.
- the natural resonance frequency of the parallel resonant circuit does not have to be set exactly to the integer multiple of the transmission frequency.
- the resulting bandstop range of this parallel resonant circuit includes this integer multiple.
- the bandstop range includes, for example, two harmonics or two harmonics by setting the natural resonance frequency of the parallel resonant circuit between two harmonics, that is between two integer multiples of the transmission frequency.
- the parameters that a person skilled in the art should use as a guide for the layout or design of such a transmission device are the geometry of the carrier element (diameter of a rod on which the coil antenna is arranged and / or thickness of a cover that is arranged around the coil antenna, length, Curvature) and / or the material type of the carrier material (for example rubber or rubber with integrated electrically conductive granulate, for example carbon) and / or the geometry of the coil shape itself.
- suitable values can be determined by simple technical experiments at a given transmission frequency. For example, based on an initial prototype with an initial geometry, two further prototypes can be manufactured or simulated, the geometry of which deviates from the initial geometry on the one hand to a larger value (e.g.
- the integer multiple of the fourth or fifth or sixth or seventh harmonic of the transmission frequency or this is included in the bandstop range.
- This transmission range is already very far away from the original transmission frequency, so that there is a high probability that receivers for other radio technologies are provided in a motor vehicle, which means that it is worth suppressing the harmonics by means of the band-stop range of the parallel resonant circuit precisely at these frequencies.
- an amplifier element as it can be provided in the driver circuit for producing or causing the alternating current, is connected to the coil antenna via a circuit part that is resonance-free, i.e. does not have its own resonance frequency, or its resonance frequency, if it has one, at least is different from the natural resonance frequency of the parallel resonant circuit.
- the connecting circuit part can, for example, exclusively comprise or provide electrical lines, that is to say for example wires or conductor tracks.
- Said amplifier element can be, for example, an operational amplifier or a transistor circuit.
- the transmission frequency in the driver circuit is set to a value in a value range from 70 kilohertz to 250 kilohertz. It has been found that, for such a transmission frequency, the attenuation of harmonics can be reliably implemented by the described design or configuration of the carrier material and / or the coil antenna.
- said driver circuit is used to send out what is known as a challenge signal for a radio key.
- a challenge signal has to be sent out by a motor vehicle in order to request a radio key for identification, which may be necessary to, for example, a To control the central locking or locking system of the motor vehicle.
- Such a transmission device must not, for example, interfere with the radio reception of the motor vehicle by sending out a radio signal with the challenge signal. This can be achieved particularly advantageously with the embodiment of the transmission device according to the invention.
- the invention also provides a radio key system for a motor vehicle, the radio key system having a control circuit for generating a transmission signal, for example said challenge signal.
- the control circuit is coupled to an embodiment of the transmission device according to the invention and is set up to control the transmission device by means of the transmission signal.
- the transmission signal can then be mixed up to the transmission frequency by the said driver circuit, for example by means of so-called mixing, and the electrical signal thus produced can be used to generate the alternating current in the coil antenna.
- the coil antenna then emits a radio signal, which then has less transmission power in the range of the integer multiple of the transmission frequency in the bandstop range than in the event that the inherent parallel resonant circuit would have a different natural resonance frequency.
- a reception signal from the radio key must also be received by the radio key system.
- said control circuit of the radio key system is additionally coupled to a receiver circuit for a response signal from a radio key.
- the response signal can be a response to the challenge signal.
- the receiver circuit can be set up to determine a distance and / or a relative direction in which the radio key is located with respect to the motor vehicle on the basis of the response signal. Such a location is known per se from the prior art.
- the radio key system is provided in a motor vehicle, the result is a motor vehicle which is also part of the invention and is characterized by the embodiment of the radio key system according to the invention.
- a motor vehicle can be designed, for example, as a passenger car or truck.
- this motor vehicle has a radio receiver with a predetermined reception frequency range. It is then provided that the said natural resonance frequency of the inherent parallel resonant circuit of the transmitting device is set to a value that is in the said Reception frequency range.
- the radio receiver is prevented from receiving flarmonic or harmonics of the radio signal with more than a predetermined transmission power in its receiving frequency range and this leads to interference.
- FIG. 1 shows a schematic representation of an embodiment of the motor vehicle according to the invention.
- FIG. 2 shows a schematic equivalent circuit diagram for a coil antenna with parasitic parallel capacitance
- FIG. 3 shows a schematic equivalent circuit diagram of the coil antenna as a parallel resonant circuit
- FIG. 4 shows a diagram with schematized courses of amplitude responses over frequency.
- Fig. 1 shows a motor vehicle 10, which can be, for example, a motor vehicle or a truck.
- a transmission device 11 can be provided in the motor vehicle 10, which can be part of a radio key system 12, for example.
- the transmission device 11 can be activated by a control circuit 13 of the radio key system 12 with a transmission signal 14.
- a radio signal 15 can be generated by means of the transmission device 11 as a function of the transmission signal 14 and emitted by the motor vehicle 10.
- the transmitting device can have a coil antenna 16 and a driver circuit 17 for driving or controlling the coil antenna 16.
- the driver circuit 17 can generate an alternating current 18 as a function of the transmission signal 14, for example by means of an amplifier element 19, for example an operational amplifier or a transistor circuit.
- the amplifier element 19 of the driver circuit 17 can be coupled to the coil antenna 16 via a circuit part 19 'which has no relevant filter property for the alternating current 18, that is, for example, is free of resonance. It can be a coaxial cable, for example.
- the alternating current 18 can flow in an electrical conducting element 20 of the coil antenna 16 and thereby generate an electromagnetic alternating field or an alternating magnetic field in the vicinity of the coil antenna 16 which propagates as the radio signal 15.
- the coil antenna 16 can be implemented by a helix shape or coil shape of the guide element 20.
- the guide element 20 can be mechanically supported here, for example, by a carrier element 21 in the interior of the coil shape, around which the guide element 20 can be wound, and / or by a carrier element 22 that can be slipped around the coil antenna 16.
- the shape of the coil antenna 16 and / or the geometry and / or the carrier material of the respective carrier element 21, 22 can result in a parasitic parallel capacitance 23 along a course of the guide element 20, as is symbolically represented in an equivalent circuit diagram in FIG. 2.
- the pitch of the coil shape is exaggerated for a better view, the turns of the guide element 20 can also touch (with electrical insulation in between) or the guide element 20 can also be designed as a flat coil. It is shown that a differential portion or a small portion or a component of the parallel capacitance 23 can act in each case for each route section of the guide element 20.
- the parallel capacitance 23 can act, for example, with respect to a ground potential 24 and / or as a coupling capacitance from conductor section to conductor section.
- FIG. 3 shows how overall with respect to of the connection point 25 results in a parallel resonant circuit 26 - comprising the entirety of the parallel capacitance 23 and a self-inductance 27 of the coil antenna 16 itself.
- FIG. 4 illustrates how amplitudes A of electrical signals and / or magnetic radio signals can behave in this way over the frequency f.
- the driver circuit 17 generates the alternating current 18 at a transmission frequency S for the provision of a transmission frequency band 28.
- harmonics or harmonics 29 can result, the amplitude A of which is shown here even without the action of the parallel resonant circuit 26.
- the parallel resonant circuit 26 can act beyond the connection point 25, the frequency response 30 of which with a bandstop region 31 can have a damping effect on the harmonics 29, in particular in a region of a natural frequency Fbs in the bandstop region 31.
- the harmonics or harmonics 29 lying in the band-stop range 31 are attenuated, so that an amplitude curve 32 results in the radio signal 15 (FIG Bandstop area 31 the harmonics or harmonics 29 are attenuated in comparison to the case in which the bandstop area 31 is not present.
- the bandstop range 31 can be defined as that frequency range in which a damping caused by the parallel resonant circuit 26 is greater than 3 dB, in particular greater than 6 dB, preferably greater than 10 dB.
- at least one harmonic or harmonic 29 is attenuated in a targeted manner in the transmission device 11.
- it can be a harmonic or harmonic wave 29, which can lie in a reception frequency range 33 of a radio receiver of the motor vehicle 10.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Lock And Its Accessories (AREA)
- Transmitters (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102020103283.8A DE102020103283A1 (de) | 2020-02-10 | 2020-02-10 | Sendevorrichtung für ein Kraftfahrzeug zum Aussenden eines Funksignals sowie Funkschlüsselsystem und Kraftfahrzeug |
| PCT/EP2021/052566 WO2021160496A1 (de) | 2020-02-10 | 2021-02-03 | Sendevorrichtung für ein kraftfahrzeug zum aussenden eines funksignals sowie funkschlüsselsystem und kraftfahrzeug |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4104241A1 true EP4104241A1 (de) | 2022-12-21 |
Family
ID=74553825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP21703426.3A Pending EP4104241A1 (de) | 2020-02-10 | 2021-02-03 | Sendevorrichtung für ein kraftfahrzeug zum aussenden eines funksignals sowie funkschlüsselsystem und kraftfahrzeug |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US12176605B2 (de) |
| EP (1) | EP4104241A1 (de) |
| DE (1) | DE102020103283A1 (de) |
| WO (1) | WO2021160496A1 (de) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4495503A (en) * | 1982-02-19 | 1985-01-22 | Morman William H | Slow wave antenna |
| JP2003134887A (ja) | 2001-10-17 | 2003-05-09 | Yazaki Corp | 初期化駆動装置 |
| US20030076096A1 (en) * | 2001-10-18 | 2003-04-24 | Microchip Technology Incorporated | Apparatus and method of increasing the sensitivity of magnetic sensors used in magnetic field transmission and detection systems |
| DE102005032379A1 (de) | 2005-07-08 | 2007-01-11 | Conti Temic Microelectronic Gmbh | Zugangskontrollsystem für ein Kraftfahrzeug |
| CN103703617B (zh) | 2011-12-22 | 2016-06-08 | 株式会社村田制作所 | 磁性体天线、天线装置及电子设备 |
| DE102013111027A1 (de) | 2013-10-04 | 2015-04-09 | Infineon Technologies Ag | Mehrfrequenzfähige Antenne für miniaturisierte Anwendungen |
| DE102014208880B4 (de) * | 2014-05-12 | 2016-09-01 | Continental Automotive Gmbh | Treiberschaltung für eine Induktivität und aktive Sendeeinrichtung mit einer Treiberschaltung |
| US9495522B2 (en) | 2014-09-03 | 2016-11-15 | Microsoft Technology Licensing, Llc | Shared session techniques |
| GB2532315B (en) | 2014-09-05 | 2019-04-17 | Smart Antenna Tech Limited | Compact antenna array configured for signal isolation between the antenna element ports |
| EP3411922B1 (de) | 2016-10-20 | 2023-12-06 | Huawei Technologies Co., Ltd. | Integrierte filtrierung von bandsperre in einem antennenelement |
| CN106935954A (zh) | 2017-01-19 | 2017-07-07 | 瑞声科技(新加坡)有限公司 | 天线及移动终端 |
-
2020
- 2020-02-10 DE DE102020103283.8A patent/DE102020103283A1/de active Pending
-
2021
- 2021-02-03 WO PCT/EP2021/052566 patent/WO2021160496A1/de not_active Ceased
- 2021-02-03 EP EP21703426.3A patent/EP4104241A1/de active Pending
- 2021-02-03 US US17/790,783 patent/US12176605B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| DE102020103283A1 (de) | 2021-08-12 |
| US20220399638A1 (en) | 2022-12-15 |
| WO2021160496A1 (de) | 2021-08-19 |
| US12176605B2 (en) | 2024-12-24 |
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