CN117044031A - Antenna device for electronic vehicle key - Google Patents
Antenna device for electronic vehicle key Download PDFInfo
- Publication number
- CN117044031A CN117044031A CN202280017922.6A CN202280017922A CN117044031A CN 117044031 A CN117044031 A CN 117044031A CN 202280017922 A CN202280017922 A CN 202280017922A CN 117044031 A CN117044031 A CN 117044031A
- Authority
- CN
- China
- Prior art keywords
- antenna
- conductive path
- spiral
- antenna device
- circuit board
- 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
- 230000005404 monopole Effects 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 description 6
- 230000037431 insertion Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/18—Input circuits, e.g. for coupling to an antenna or a transmission line
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B1/0458—Arrangements for matching and coupling between power amplifier and antenna or between amplifying stages
Abstract
An antenna arrangement for an electronic key comprising an antenna (10) and an antenna circuit (20) configured to control the antenna (10), wherein the antenna (10) and the antenna circuit (20) are arranged on a printed circuit board (30), the antenna arrangement being configured to transmit and receive ultra wideband signals or signals according to the bluetooth standard, and the antenna circuit (20) comprises a filter arrangement (24) configured to filter signals received by the antenna (10) and to be transmitted thereby, wherein the filter arrangement (24) comprises a capacitance formed by at least two conductive paths formed on the printed circuit board (30).
Description
Technical Field
The present invention relates to an antenna device, and more particularly, to an antenna device for an electronic vehicle key.
Background
Today, most vehicles can be unlocked and remotely started using an electronic vehicle key. For example, some "start-stop" access systems are well known in which a user needs to press an unlock button of an electronic remote key to unlock or lock a vehicle, start an engine of the vehicle, or open a trunk of the vehicle. Such electronic vehicle keys typically must be inserted into an immobilizer station located inside the vehicle so that the immobilizer station recognizes the vehicle key and allows the user to start the vehicle. Such a system replaces the initially known ignition switch system. Other "start-stop" access systems do not require the user to press a button or insert a key into the burglar to unlock or lock the vehicle or start the engine. Such "start-stop" access systems are known as passive start-up and entry systems or Remote Keyless Entry (RKE) systems. In the case of a passive start and entry system, the vehicle may be automatically unlocked when a key is detected within a certain range from the vehicle. To start the vehicle, it is often necessary to press a start button within the vehicle.
Such electronic vehicle keys use wireless technology to communicate with the vehicle. For this reason, electronic vehicle keys typically include two or even more different antennas. For example, the electronic vehicle key may include at least one Low Frequency (LF) antenna, an Ultra High Frequency (UHF) antenna, an Ultra Wideband (UWB) antenna, and an antenna for bluetooth communications. Bluetooth or Bluetooth Low Energy (BLE) communications may be used, for example, to transfer various information (e.g., tire pressure, fuel status, etc.) from a vehicle to a vehicle key or portable electronic device (e.g., a smart phone). A filter stage needs to be provided for each antenna. The filter stage is typically quite expensive and requires a certain amount of space.
Disclosure of Invention
It is necessary to provide an antenna device for an electronic vehicle key that requires relatively little space and can be implemented at relatively low cost.
This problem is solved by an antenna device according to claim 1 and an electronic vehicle key according to claim 12. Configurations and further developments of the invention are the subject matter of the dependent claims.
An antenna arrangement for an electronic key comprises an antenna and an antenna circuit configured to control the antenna, wherein the antenna and the antenna circuit are arranged on a printed circuit board, the antenna arrangement is configured to transmit and receive ultra wideband signals or signals according to the bluetooth standard, and the antenna circuit comprises a filter arrangement configured to filter signals received by and to be transmitted by the antenna, wherein the filter arrangement comprises a capacitance formed by at least two conductive paths formed on the printed circuit board.
Because the filter arrangement can be formed in a cost-effective manner, such an antenna arrangement can be formed in a very cost-effective manner. All that is required to form the filter device is the material used to form at least two conductive paths on the printed circuit board.
The capacitor may include a double spiral shape including a first spiral conductive path and a second spiral conductive path that spiral with each other.
In this way, a filter device can be formed that has satisfactory performance for many applications.
The first and second spiral conductive paths may each have a width between 0.1mm and 0.2mm in a horizontal direction, wherein the horizontal direction is a direction parallel to a surface of the printed circuit board on which the first and second spiral conductive paths are formed.
In this way, a filter device can be formed that has satisfactory performance for many applications.
The first spiral conductive path and the second spiral conductive path may each have a width of 0.14mm in a horizontal direction.
The first spiral conductive path may be connected to the first conductive path and the second spiral conductive path may be connected to the second conductive path.
The first conductive path and the second conductive path may each have a width between 0.5mm and 1.5mm in the horizontal direction.
The first conductive path and the second conductive path may each have a width of 0.9mm in the horizontal direction.
The first conductive path and the second conductive path may be a 50 Ω microstrip line.
In this way, a filter device can be formed which has satisfactory performance for many applications, in particular for ultra wideband and bluetooth antennas.
The at least two conductive paths may comprise copper.
This allows the filter means and thus the antenna means to be formed in a very cost-effective manner.
The at least two conductive paths may have a thickness of between 0.4mm and 0.6mm in a vertical direction, wherein the vertical direction is a direction perpendicular to a surface of the printed circuit board on which the conductive paths are formed.
In this way, a filter device can be formed that has satisfactory performance for many applications.
The antenna may include conductive paths on a printed circuit board.
The antenna may be a monopole antenna or an inverted F antenna.
For example, a monopole antenna may be used for UWB transmissions and an inverted-F antenna may be used for bluetooth or bluetooth low energy transmissions.
An electronic vehicle key includes an antenna device.
Drawings
Examples will now be explained with reference to the drawings. In the drawings, like reference numerals refer to like features.
Fig. 1 schematically illustrates an antenna arrangement according to an example.
Fig. 2 schematically illustrates an antenna arrangement according to an example, arranged on a printed circuit board.
Fig. 3 schematically shows a filter arrangement according to an example.
Fig. 4 shows schematically in a schematic view a different graph of the filter arrangement of fig. 3.
Fig. 5 schematically shows a filter arrangement according to another example.
Fig. 6 shows schematically in a schematic view a different graph of the filter arrangement of fig. 5.
Detailed Description
In the following figures, only such elements are shown that are useful for understanding the present invention. The filter device, antenna device and electronic vehicle key described below may include more elements than the exemplary elements shown in the figures. However, any additional elements not required to practice the invention are omitted for clarity.
Fig. 1 illustrates an antenna arrangement that may be implemented in an electronic vehicle key. Signals may be sent between the vehicle and the electronic vehicle key (the vehicle and the electronic key are not specifically shown in fig. 1). For example, the electronic vehicle key may send an interrogation signal to the vehicle to indicate a user's desire to unlock/lock the vehicle. Further, an authentication signal may be sent between the electronic vehicle key and the vehicle, for example, in order to prevent an unauthorized user (unauthorized key) from unlocking or starting the vehicle. Many other signals may be sent between the electronic vehicle key and the vehicle for many different applications.
Thus, the electronic vehicle key may include different antennas. One antenna 10 and corresponding antenna circuit 20 are schematically shown in fig. 1. For example, the antenna 10 may be an Ultra Wideband (UWB) antenna. Ultra-wideband is a radio technology that can use very low power consumption levels for short-range, high-bandwidth communications over a large portion of the radio spectrum. However, the antenna 10 may also be an antenna configured to transmit and receive signals according to the bluetooth standard, for example, at a frequency of 2.4 GHz.
The antenna arrangement shown in fig. 1 comprises an antenna circuit 20, which antenna circuit 20 comprises a matching circuit 22, a filter stage or filter arrangement 24, and a controller 26. The matching circuit 22 may be configured to match the input impedance of the antenna 10 to the output impedance of the antenna circuit 20. For example, the matching circuit 22 may include a capacitor and an inductance. The filter means 24 is configured to filter the signal received by the antenna 10 and the signal to be transmitted by it. The filter means 24 may comprise a front-end band-pass filter, for example, in order to reduce or even avoid spurious emissions during signal transmission and in-band noise during signal reception, which may negatively affect demodulation. The controller 26 is configured to control the functions of the antenna circuit 20 and process signals received via the antenna 10 and/or signals to be transmitted via it.
The filter means for the antenna circuit typically comprise ceramic filters or so-called SAW filters. Such filters generally have very satisfactory performance but are quite expensive.
Referring now to fig. 2, a printed circuit board 30 is schematically illustrated. The antenna 10 is arranged on a printed circuit board 30. For example, the antenna 10 may be formed of conductive paths disposed on the printed circuit board 30. For example, the antenna 10 may be a monopole antenna or an inverted-F antenna. A monopole antenna is schematically illustrated in fig. 2. The antenna circuit 20 may also be arranged on the printed circuit board 30. The filter arrangement 24 may comprise a capacitance formed by at least two conductive paths on the printed circuit board 30. This is schematically illustrated in fig. 3. For example, the filter arrangement 24 illustrated in fig. 3 may be used with the bluetooth antenna 10. The filter arrangement 24 comprises a double spiral shape. The double spiral shape includes a first spiral conductive path 2412 and a second spiral conductive path 2422. The first spiral conductive path 2412 may be connected to the first conductive path 2410 and the second spiral conductive path 2422 may be connected to the second conductive path 2420. For illustrative purposes only, and in particular to be able to clearly distinguish the second spiral conductive path 2422 from the first spiral conductive path 2412, the second spiral conductive path 2422 is illustrated in dashed lines in fig. 3. However, the second spiral conductive path 2422 is formed by a continuous conductive path on the printed circuit board 30. The first spiral conductive path 2412 and the second spiral conductive path 2422 each form a spiral and spiral with each other, thereby forming a capacitor. For example, each of the first spiral conductive path 2412 and the second spiral conductive path 2422 may form at least three complete turns. According to one example, each of the first spiral conductive path 2412 and the second spiral conductive path 2422 forms three to ten complete turns.
The first and second spiral conductive paths 2412 and 2422 have a smaller width d2 in the horizontal direction than the width d1 of the first and second conductive paths 2410 and 2420 in the horizontal direction. The horizontal direction is a direction parallel to the surface of the printed circuit board 30 on which the first spiral conductive path 2412 and the second spiral conductive path 2422 are formed. For example, the width d1 of the first and second conductive paths 2410 and 2420 may be between 0.5mm (millimeters) and 1.5 mm. According to one example, the width d1 of the first and second conductive paths 2410 and 2420 is 0.9mm. For example, the width d2 of the first and second spiral conductive paths 2412, 2422 may be between 0.1mm and 0.2 mm. According to one example, the width d2 of the first and second spiral conductive paths 2412 and 2422 is 0.14mm. For example, the thicknesses of the first conductive path 2410, the second conductive path 2420, the first spiral conductive path 2412, and the second spiral conductive path 2422 in the vertical direction z may be between 0.4mm and 0.6 mm. According to one example, the thickness is 0.5mm. The vertical direction z is a direction perpendicular to the surface of the printed circuit board 30 on which the first spiral conductive path 2412 and the second spiral conductive path 2422 are formed.
For example, the first conductive path 2410 and the second conductive path 2420 may be configured to function as an input line and an output line, respectively, and they may be implemented as a 50 Ω microstrip line.
For example, the first conductive path 2410, the second conductive path 2420, the first spiral conductive path 2412, and the second spiral conductive path 2422 may include copper.
Thus, the filter arrangement 24 can be implemented in a very cost-effective manner. The materials required to form the filter arrangement 24 on the printed circuit board 30 are typically very inexpensive. The filter arrangement 24 requires only a certain amount of space on the printed circuit board 30. The performance of the described filter arrangement 24 is somewhat inferior compared to SAW filters or ceramic filters, but is acceptable for many applications due to the cost reduction benefits.
A similar filter arrangement 24 for an ultra wideband antenna is schematically shown in fig. 5.
The filter arrangement 24 described above provides satisfactory transmission and lower insertion loss for those frequencies commonly used for ultra wideband and bluetooth transmissions. Outside the frequency band of interest, the insertion loss increases such that any unwanted signals outside the desired frequency band will be blocked. This is schematically shown in fig. 4 (for bluetooth) and fig. 6 (for ultra wideband).
As can be seen in fig. 4, for in-band reception (between about 2.4GHz and 2.5 GHz), the insertion loss is about 1.79dB (the curve marked with triangles). For frequencies above 2.7GHz, the insertion loss increases to 10dB or more. Fig. 4 also shows the frequency response of the input (curve marked with crosses) and the output (curve marked with dots).
As can be seen in fig. 6, for in-band reception (between about 6.5GHz and 7.2 GHz), the insertion loss is about 2dB (the curve marked with triangles). The bandwidth is about 500MHz, which is sufficient for ultra wideband channels. For frequencies above 7.3GHz or below 6.2GHz, the insertion loss increases to 8dB or more. Fig. 6 also shows the frequency response of the input (curve marked with crosses) and the output (curve marked with dots).
The filter arrangement 24 has been described above in relation to bluetooth and ultra wideband transmissions. However, the filter arrangement may be adapted to other frequency bands. The quality of the filter arrangement 24 may depend on the quality of the printed circuit board 30.
List of reference numerals
10. Antenna
20. Antenna circuit
22. Matching circuit
24. Filter device
2410. First conductive path
2412. First spiral conductive path
2420. Second conductive path
2422. Second spiral conductive path
26. Controller for controlling a power supply
30. Circuit board
Claims (13)
1. An antenna device for an electronic key, the antenna device comprising
An antenna (10); and
an antenna circuit (20) configured to control the antenna (10); wherein,
the antenna (10) and the antenna circuit (20) are arranged on a printed circuit board (30),
the antenna device is configured to transmit and receive ultra wideband signals or signals according to the Bluetooth standard, and
the antenna circuit (20) comprises a filter arrangement (24) configured to filter signals received by and to be transmitted by the antenna (10), wherein the filter arrangement (24) comprises a capacitance formed by at least two conductive paths formed on the printed circuit board (30).
2. The antenna arrangement of claim 1, wherein the capacitance comprises a double spiral shape comprising a first spiral conductive path (2412) and a second spiral conductive path (2422) that spiral with each other.
3. The antenna device of claim 2, wherein the first spiral conductive path (2412) and the second spiral conductive path (2422) each have a width (d 2) between 0.1mm and 0.2mm in a horizontal direction, wherein the horizontal direction is a direction parallel to a surface of the printed circuit board (30) on which the first spiral conductive path (2412) and the second spiral conductive path (2422) are formed.
4. The antenna device of claim 3, wherein the first spiral conductive path (2412) and the second spiral conductive path (2422) each have a width (d 2) of 0.14mm in the horizontal direction.
5. The antenna arrangement of any of claims 2-4, wherein the first spiral conductive path (2412) is connected to a first conductive path (2410) and the second spiral conductive path (2422) is connected to a second conductive path (2420).
6. The antenna device of claim 5, wherein the first conductive path (2410) and the second conductive path (2420) each have a width (d 1) in the horizontal direction between 0.5mm and 1.5 mm.
7. The antenna device of claim 6, wherein the first conductive path (2410) and the second conductive path (2420) each have a width (d 1) of 0.9mm in the horizontal direction.
8. The antenna device of any of claims 5-7, wherein the first conductive path (2410) and the second conductive path (2420) are 50 Ω microstrip lines.
9. The antenna device of any of the preceding claims, wherein the at least two conductive paths comprise copper.
10. The antenna device as claimed in any of the preceding claims, wherein the at least two conductive paths have a thickness of between 0.4mm and 0.6mm in a vertical direction (z), wherein the vertical direction (z) is a direction perpendicular to the surface of the printed circuit board (30) on which the conductive paths are formed.
11. The antenna device as claimed in any of the preceding claims, wherein the antenna (10) comprises a conductive path on the printed circuit board (30).
12. The antenna device according to claim 11, wherein the antenna (10) is a monopole antenna or an inverted-F antenna.
13. An electronic vehicle key comprising the antenna device as defined in any one of claims 1 to 12.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP21465507.8 | 2021-03-04 | ||
| EP21465507 | 2021-03-04 | ||
| DE102021202319.3 | 2021-03-10 | ||
| PCT/EP2022/055311 WO2022184788A1 (en) | 2021-03-04 | 2022-03-02 | Antenna arrangement for an electronic vehicle key |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117044031A true CN117044031A (en) | 2023-11-10 |
Family
ID=75377701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202280017922.6A Pending CN117044031A (en) | 2021-03-04 | 2022-03-02 | Antenna device for electronic vehicle key |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117044031A (en) |
| DE (1) | DE102021202319A1 (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4583099A (en) | 1983-12-27 | 1986-04-15 | Polyonics Corporation | Resonant tag circuits useful in electronic security systems |
| JP3972810B2 (en) | 2002-12-18 | 2007-09-05 | 株式会社村田製作所 | Duplexer and communication device |
| EP1926223B1 (en) | 2006-11-21 | 2018-02-28 | Sony Corporation | Communication system and communication apparatus |
| DE102014216539B4 (en) | 2014-08-20 | 2024-02-15 | Conti Temic Microelectronic Gmbh | Device and method for operating at least two antennas for a motor vehicle |
-
2021
- 2021-03-10 DE DE102021202319.3A patent/DE102021202319A1/en active Pending
-
2022
- 2022-03-02 CN CN202280017922.6A patent/CN117044031A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE102021202319A1 (en) | 2022-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2092641B1 (en) | An apparatus for enabling two elements to share a common feed | |
| US9570806B1 (en) | Dual band transmitter | |
| US9728024B2 (en) | Fob with increased power level from hand-antenna coupling | |
| CN101878561A (en) | Antenna device | |
| WO2017205207A1 (en) | Smartphone with integrated multi-transponder mode key device | |
| KR102588990B1 (en) | Device for closing and/or opening | |
| US11414901B2 (en) | System for detecting approach and/or contact of a user and ultra high frequency communication with a portable user apparatus | |
| EP1723615B1 (en) | Inductive component for an electronic key | |
| US6457337B1 (en) | Key, lock, and key and lock system | |
| CN117044031A (en) | Antenna device for electronic vehicle key | |
| US20160182696A1 (en) | Portable radio communication device with adjustable gain and associated gain adjustment method | |
| CN102682504A (en) | System and method for extending remote vehicle control functions | |
| US20240154297A1 (en) | Antenna arrangement for an electronic vehicle key | |
| US10476143B1 (en) | Antenna for base station of wireless remote-control system | |
| EP4283787A1 (en) | Antenna arrangement for an electronic key | |
| EP3920326A1 (en) | Antenna arrangement for electronic vehicle key | |
| GB2543934A (en) | Fob with increased power level from hand-antenna coupling | |
| US11479208B2 (en) | Locking system, in particular for a motor vehicle | |
| US7532608B2 (en) | Electronic anti-theft system with correlated transmit/receive antennas | |
| JP2012509630A (en) | Automotive communication systems | |
| US11955724B2 (en) | Antenna and tuning for key fob with four band operation | |
| EP3920325A1 (en) | Antenna arrangement for electronic vehicle key | |
| CN203180912U (en) | Vehicle remote-control sending and receiving device | |
| US11326375B2 (en) | Door handle with means for reducing ultra-high-frequency communication radiation | |
| CN213093360U (en) | Electronic control unit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |