EP4562444A1 - Radarsystem - Google Patents
RadarsystemInfo
- Publication number
- EP4562444A1 EP4562444A1 EP23744416.1A EP23744416A EP4562444A1 EP 4562444 A1 EP4562444 A1 EP 4562444A1 EP 23744416 A EP23744416 A EP 23744416A EP 4562444 A1 EP4562444 A1 EP 4562444A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radar system
- heat
- antenna element
- recesses
- openings
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/02—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S13/00
- G01S7/03—Details of HF subsystems specially adapted therefor, e.g. common to transmitter and receiver
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/02—Arrangements for de-icing; Arrangements for drying-out ; Arrangements for cooling; Arrangements for preventing corrosion
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/40—Radiating elements coated with or embedded in protective material
- H01Q1/405—Radome integrated radiating elements
Definitions
- the invention relates to a radar system, comprising an electronic component for sending and/or receiving radar signals and an antenna element, the antenna element being designed as a plastic body in which channels with metallized channel walls are introduced, the channels forming waveguides.
- Such a radar system is known, for example, from US 2021/0183797 A1.
- Radar systems of the type mentioned at the beginning are often used in motor vehicles and form part of driver assistance systems.
- radar systems record the surroundings and, based on the recorded data, enable an automatic reaction of a motor vehicle or at least information to the driver, in particular in the form of a warning.
- This makes it possible, on the one hand, to regulate the speed of a vehicle to a speed specified by the driver if the traffic situation permits this, with the speed being automatically adapted to the traffic situation.
- automatic emergency braking can be initiated.
- radar systems are often combined with other sensors, such as wheel sensors and camera sensors. Compared to other systems, radar systems have the advantage that they are reliable even in bad weather conditions. In addition to recording distances to detected vehicles and objects, it is also possible to use the Doppler effect to determine the relative speed to other vehicles.
- the antenna element is a central element that significantly influences the functionality of the radar system. It is there known to form the antenna element from a one-piece or multi-part plastic body, channels being introduced into the antenna element and the channel walls of the channels being equipped to be electrically conductive, which form waveguides. The antenna element is brought into operative connection with the electronic component for sending and/or receiving radar signals.
- the electronic component is usually a microchip in the form of a high-frequency chip that is arranged on a circuit board.
- the problem here is that a significant amount of heat is emitted during operation of the radar system, which is due in particular to the need to provide electromagnetic waves in a spectrum that is usual for radar waves and has a sufficient range.
- the heat emission can amount to several watts, which is associated with a high heat load in a small space, especially in compact radar systems. Due to their low thermal conductivity, antenna elements made of plastic are only partially suitable for dissipating heat from the system in a suitable form.
- the invention is based on the object of providing a radar system which has improved thermal properties.
- the radar system comprises an electronic component for sending and/or receiving radar signals and an antenna element, wherein the antenna element is made of a plastic body, in which channels with electrically conductive channel walls are introduced, the channels forming waveguides, heat-conducting elements being introduced into the antenna element are.
- the antenna element has, in addition to the electromagnetic
- the antenna element can transport away heat introduced during production via the heat-conducting elements. This makes it possible to supply more heat during production and also shorten the cooling time. Furthermore, it is possible to design a compact radar system that is robust and can be operated over a long period of time. The improved thermal properties of the antenna element even out the temperature within the antenna element. In addition, the heat dissipation of the chip that sends and receives the radar radiation also improves, so that the measurement accuracy of the radar system and the transmission power improve.
- the individual elements are often connected to one another using a soldering process.
- the heat is usually supplied via an air flow that is applied to both sides of the antenna element.
- the heat-conducting elements improve the transport of warm air and it improves heat can be better transported into the interior of the elements. This allows the joining process to be accelerated and at the same time results in a soldered connection with improved quality.
- the heat-conducting elements can include recesses and/or openings that are made in the plastic body.
- the recesses and/or openings are made into the plastic body independently of the channels forming the waveguides.
- temperature-resistant polymers such as polyphenylene sulfide (PPS), polyetherimide (PEI), polyphenylene ether (PPE), polyamide (PA), liquid crystalline polymer (LCP), polycarbonate (PC), polyphthalamide (PPA), polyether ether ketone (PEEK) are used as plastic for the antenna element. or mixtures of the aforementioned polymers.
- the areas of the antenna element are free of recesses and/or openings that are assigned to the microchip or the corresponding area of the circuit board.
- the thermal conductivity can be improved by coating the recesses and/or openings with thermally conductive material.
- Advantageous materials for the coating include metals such as nickel, chrome, aluminum, copper, tin, zinc, silver or gold. These materials are also suitable for making the channel walls electrically conductive.
- the metallic coating can be single-layer or multi-layer. Thermal conduction occurs parallel to the material of the antenna element via the coating of the recesses and/or openings, so that the overall thermal conductivity improves. For example, a typical thermal conductivity coefficient for plastic is around 0.3 W/m*K and for copper around 300 W/mxK.
- the application of a metallic coating can be carried out in particular by galvanic coating.
- Ceramic coatings for example based on aluminum oxide, are also conceivable. Ceramic coatings can be applied using a vacuum process.
- the layer thickness of the coating is preferably between 0.5 pm and 40 pm. Such a coating is inexpensive and has good thermal conductivity.
- the recesses can be designed, for example, in the form of blind holes or through holes. It is conceivable to design the recesses circular. However, the recesses or openings particularly preferably have a shape that deviates from the circular shape. It is advantageous that the lateral surface of the recesses or openings increases, which in turn increases the thermal conductivity. This applies in particular if the wall of the recesses and/or openings is coated with thermally conductive material. For example, the recesses or openings can be designed in the shape of a cloverleaf when viewed from above. To improve cooling performance The recesses and/or openings preferably do not accommodate any objects, in particular no holding means such as screws and the like.
- the recesses and/or openings can form channels.
- the recesses protrude into the plastic body or pass through the plastic body in the case of openings. This makes it possible to dissipate heat from the radar system through the plastic body or to transfer it to other components of the radar system via the plastic body.
- the heat flow through the antenna element increases with the number of recesses and/or openings per unit area.
- the area unit preferably refers to the surface of the antenna element that faces the electronic component. It has proven to be advantageous if between 10 and 50 recesses and/or openings are provided per cm 2 of surface facing the electronic component. A good heat flow results from just 3 recesses and/or openings per cm 2 .
- the recesses and openings can have a wide variety of geometric shapes, with the geometric shape and in particular the surface available for heat transfer influencing the heat transfer.
- the recesses can be arranged in the area of the surface facing the electronic component.
- the openings are preferably designed so that they pass through the antenna element.
- the recesses and/or openings it may be sufficient if between 3 to 15 recesses or openings are provided per cm 2 of surface facing the electronic component, if the recesses or openings are elongated and in particular have a length of more than 10 mm exhibit. For meandering structures, 1 to 10 per cm 2 of surface facing the electronic component may be sufficient. Meandering structures are particularly advantageous for recesses close to the surface. Overall, with this design good heat conduction through the antenna element, especially during production and the associated joining processes. At the same time, the functionality of the antenna element is not impaired.
- the heat-conducting elements can include recesses in the form of surface structures.
- surface structures in the form of ribs or grooves can be introduced into the surface of the plastic body, the surface structures increasing the surface area of the plastic body, which in turn is accompanied by an increase in thermal conductivity. It is particularly conceivable to introduce the surface structuring in the areas of the plastic body that are not related to the channels forming the waveguides.
- An advantageous heat release via the surface structures results if 3 to 15 structures in the form of ribs or grooves are provided per cm 2 of surface facing the electronic component. This is particularly true if the structures are elongated and have a length of more than 10 mm. For meandering structures, 1 to 10 recesses per cm 2 of surface facing the electronic component may be sufficient.
- Heat conducting bodies can be embedded in the antenna element. Heat-conducting bodies have a higher thermal conductivity coefficient than the material of the plastic body. This means that heat can be transported to the outside particularly quickly and effectively via the heat-conducting bodies.
- the heat-conducting bodies can be made of metallic material.
- the heat-conducting bodies can be made of metallic material.
- Heat-conducting materials made of metallic materials such as copper or aluminum are particularly suitable as materials for the heat-conducting bodies.
- the heat-conducting bodies can consist of thermally conductive plastic.
- the heat-conducting bodies are designed in such a way that the thermal conductivity is greater than that of the material of the plastic body.
- the thermally conductive plastic preferably has a thermal conductivity of at least 1 W/m*K.
- the antenna element can be designed in multiple layers. In this embodiment, it is possible to form particularly complex channels and/or to arrange heat-conducting elements within the plastic body. In addition, it is conceivable that the layers of the multilayer antenna element have different heat conduction properties. It is particularly advantageous in this context if the layer that faces the component or the circuit board has a higher thermal conductivity than the other layers. For this purpose, the layer facing the component or the circuit board can be provided with a thicker coating, in particular with a thicker metallic coating.
- the heat-conducting elements can include applied, for example printed, structures.
- the antenna element can be covered by a radome.
- the radome protects the antenna element from external influences.
- the radome can form a structural unit with the antenna element.
- the waveguides are closed on the side where the electromagnetic radiation exits and the electromagnetic radiation is passed through by appropriately modifying the coating.
- Fig. 1 shows a radar system in section
- Fig. 2 shows an antenna element in a spatial view obliquely from above
- Fig. 3 shows an antenna element in a spatial view obliquely from below
- Fig. 5 is a diagram which illustrates the thermal conductivity depending on the number of heat-conducting elements.
- the figures show a radar system 1, which is part of a driver assistance system of a vehicle.
- the radar system 1 includes an electronic component 2 for sending and/or receiving radar signals and an antenna element 3, which is arranged on the electronic component 2.
- the component 2 is designed in the form of an integrated circuit and is arranged on a circuit board 6.
- the antenna element 3 is cohesively connected to the component 2 via an adhesive connection.
- the electronic component 2 is arranged on one main side of the circuit board 6 and the antenna element 3 on the other main side.
- the circuit board 6 is set up to allow electromagnetic radiation to pass between the component 2 and the antenna element 3.
- the antenna element 3 is designed as a plastic body made of polyether ether ketone (PEEK), the plastic body forming the antenna element 3 being designed in multiple layers and made from several plates stacked one on top of the other. Several channels 4 with metallized channel walls are introduced into the plastic body, the channels 4 forming waveguides. The waveguides are in operative connection with the transmitter/receiver units of the electronic component 2.
- the antenna element is covered by a radome.
- Heat-conducting elements 5 are introduced into the antenna element 3, which in the present embodiment include recesses and openings.
- the recesses and openings form channels. These are the recesses on the side facing the component 2 so that surface structures are formed there.
- Heat-conducting bodies which are made of metallic material, in this case aluminum, are embedded in the recesses.
- the heat-conducting bodies are made of thermally conductive plastic.
- the heat-conducting elements 5 comprise printed structures
- Figure 1 shows the previously described radar system 1 in section.
- Figure 2 shows an antenna element 3 in a spatial view obliquely from above and
- Figure 3 shows an antenna element 3 in a spatial view obliquely from below with heat-conducting elements 5 in the form of meandering openings and recesses.
- the walls of the recesses and openings are coated with a thermally conductive material.
- Figure 4 shows a top view of an embodiment of an antenna element 3, in which the heat-conducting elements 5 are designed in the form of openings which penetrate the antenna element 3.
- the cross-sectional shape of the openings in this design is cloverleaf-shaped. With this configuration, based on the cross-sectional area of the recess, which represents the space required by an opening, there is a larger area of the channel walls and thus an improvement in heat conduction.
- the channel walls are provided with a coating made of metallic material, in this case aluminum.
- the layer thickness of the coating is 20 pm.
- 24 recesses are made in the antenna element for each cm 2 of surface facing the electronic component 2.
- Figure 5 shows a diagram of a simulation calculation, which shows that the heat flow increases with the number of breakthroughs.
- the number of breakthroughs from 0 to 12 is plotted on the abscissa and the heat flow at 40 Kelvin from 0 watts to 3 watts is plotted on the ordinate.
- the calculation is based on the fact that a cube consisting of polyamide with an edge length of 25 mm elongated openings with a length of 23 mm and a width of 1.2 mm are introduced.
- the surface of the cube is covered with a gold coating with a layer thickness of 10 pm.
- a temperature difference is created in the direction of the openings, which causes heat to flow in the same direction.
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar Systems Or Details Thereof (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102022118583.4A DE102022118583A1 (de) | 2022-07-25 | 2022-07-25 | Radarsystem |
| PCT/EP2023/069807 WO2024022872A1 (de) | 2022-07-25 | 2023-07-17 | Radarsystem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4562444A1 true EP4562444A1 (de) | 2025-06-04 |
Family
ID=87426653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23744416.1A Pending EP4562444A1 (de) | 2022-07-25 | 2023-07-17 | Radarsystem |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20260029508A1 (de) |
| EP (1) | EP4562444A1 (de) |
| JP (1) | JP2025524987A (de) |
| KR (1) | KR20250025457A (de) |
| CN (1) | CN119768702A (de) |
| DE (1) | DE102022118583A1 (de) |
| WO (1) | WO2024022872A1 (de) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6774174B2 (ja) * | 2015-10-08 | 2020-10-21 | 株式会社キーエンス | 光電スイッチ |
| DE102016007386A1 (de) * | 2016-06-17 | 2016-12-08 | Daimler Ag | Radarsystem zur Umfelderfassung für ein Fahrzeug, insbesondere für ein Kraftfahrzeug |
| DE112019005233T5 (de) * | 2018-11-27 | 2021-07-15 | Hitachi Astemo, Ltd. | Radarvorrichtung |
| US11276654B2 (en) | 2019-12-17 | 2022-03-15 | Nxp Usa, Inc. | Bottom-side heatsinking waveguide for an integrated circuit package |
| US11456227B2 (en) * | 2019-12-17 | 2022-09-27 | Nxp Usa, Inc. | Topside heatsinking antenna launcher for an integrated circuit package |
| DE102020211254A1 (de) * | 2020-09-08 | 2022-03-10 | Conti Temic Microelectronic Gmbh | Radarsystem zur Umgebungserfassung mit einer Wellenleiterantenne gebildet aus einer Platine und einem Formteil |
-
2022
- 2022-07-25 DE DE102022118583.4A patent/DE102022118583A1/de active Pending
-
2023
- 2023-07-17 US US18/997,848 patent/US20260029508A1/en active Pending
- 2023-07-17 WO PCT/EP2023/069807 patent/WO2024022872A1/de not_active Ceased
- 2023-07-17 EP EP23744416.1A patent/EP4562444A1/de active Pending
- 2023-07-17 KR KR1020257001764A patent/KR20250025457A/ko active Pending
- 2023-07-17 CN CN202380061613.3A patent/CN119768702A/zh active Pending
- 2023-07-17 JP JP2025504429A patent/JP2025524987A/ja active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| US20260029508A1 (en) | 2026-01-29 |
| KR20250025457A (ko) | 2025-02-21 |
| CN119768702A (zh) | 2025-04-04 |
| WO2024022872A1 (de) | 2024-02-01 |
| DE102022118583A1 (de) | 2024-01-25 |
| JP2025524987A (ja) | 2025-08-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| STAA | Information on the status of an ep patent application or granted ep patent |
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| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 17P | Request for examination filed |
Effective date: 20250213 |
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| AK | Designated contracting states |
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| RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: PRESSLER, ULLA Inventor name: MOEBIUS, BIRGIT Inventor name: SARLEA, MICHAEL Inventor name: MOEHRING, DIRK Inventor name: KNAPP, MARC Inventor name: SCHMIDT, STANISLAUS Inventor name: KLINGSHIRN, CHRISTOPH L. Inventor name: MOELLER, SASCHA Inventor name: SCHAEFFNER, MAXIMILIAN Inventor name: HAUER, MATTHIAS Inventor name: RIEGER, FLORIAN Inventor name: LANGNER, TIM |
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| DAV | Request for validation of the european patent (deleted) | ||
| DAX | Request for extension of the european patent (deleted) |