WO2021106418A1 - Capteur d'ondes radio millimétriques et véhicule le comportant - Google Patents

Capteur d'ondes radio millimétriques et véhicule le comportant Download PDF

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Publication number
WO2021106418A1
WO2021106418A1 PCT/JP2020/039065 JP2020039065W WO2021106418A1 WO 2021106418 A1 WO2021106418 A1 WO 2021106418A1 JP 2020039065 W JP2020039065 W JP 2020039065W WO 2021106418 A1 WO2021106418 A1 WO 2021106418A1
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WO
WIPO (PCT)
Prior art keywords
millimeter
radio wave
antenna element
resin
wave sensor
Prior art date
Application number
PCT/JP2020/039065
Other languages
English (en)
Japanese (ja)
Inventor
永石　英幸
晃 北山
博史 篠田
都留　康隆
Original Assignee
日立Astemo株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日立Astemo株式会社 filed Critical 日立Astemo株式会社
Priority to DE112020004943.4T priority Critical patent/DE112020004943T5/de
Publication of WO2021106418A1 publication Critical patent/WO2021106418A1/fr

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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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • 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
    • G01S7/027—Constructional details of housings, e.g. form, type, material or ruggedness
    • 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
    • H01Q1/27—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
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/421—Means for correcting aberrations introduced by a radome
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
    • H01Q1/422—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material
    • H01Q1/424—Housings not intimately mechanically associated with radiating elements, e.g. radome comprising two or more layers of dielectric material comprising a layer of expanded material
    • 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
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/93—Radar or analogous systems specially adapted for specific applications for anti-collision purposes
    • G01S13/931—Radar or analogous systems specially adapted for specific applications for anti-collision purposes of land vehicles
    • G01S2013/9327—Sensor installation details
    • G01S2013/93275—Sensor installation details in the bumper area

Definitions

  • the present invention relates to a millimeter wave radio wave sensor and a vehicle equipped with the millimeter wave radio wave sensor.
  • a sensor that uses radio waves as a peripheral detection sensor for safe operation and safe operation of automobiles, railways, transportation equipment, etc.
  • a radar sensor for automobiles will be described as an example.
  • a plurality of radar sensors having different detection distances and detection angle ranges are used to cover the entire circumference of the automobile in order to support safe driving and realize automatic driving. Then, when detecting an object at a medium distance, for example, a millimeter wave radar is used.
  • FIG. 2 is a cross-sectional view showing a general configuration of a radio wave sensor 300 that handles millimeter waves.
  • the radio wave sensor 300 includes an antenna element 301, an RF circuit 302 that generates an RF signal, a substrate 303, and a cover 304.
  • the substrate 303 is a hybrid substrate in which a low dielectric loss / low dielectric constant material 305 and a glass epoxy resin material 306 are laminated, and the low dielectric loss / low dielectric constant material 305 is located on the surface side facing the cover 304.
  • the antenna element 301 and the RF circuit 302 are formed on the surface of the low dielectric loss / low dielectric constant material 305, and the millimeter wave signal generated by the RF circuit 302 is propagated to the antenna element 301 and radiated as radio waves from the antenna element 301. Will be done.
  • the surface conductor is covered with a gold-plated treatment, a resist film, or a sealing material such as silicone or polyurethane resin to prevent deterioration over time.
  • Means for suppressing may be implemented (for example, Patent Document 1).
  • millimeter waves have a larger propagation loss of high-frequency wiring and antennas provided on the substrate than microwaves, affect the signal level diagram design of RF circuits, and affect various performances of RF circuits (eg, characteristic impedance).
  • the surface conductor is covered with a sealing material, the increase in propagation loss is remarkable. Therefore, the surface conductor is mass-produced in a state of being exposed to air without any coating treatment, and the signal sensitivity of the radar device is deteriorated. It is common to keep it to a minimum.
  • Such a millimeter wave sensor is arranged on the inner surface side of an automobile bumper or the like.
  • a film-shaped antenna composed of a flexible film and a plurality of antenna elements is attached to a bumper, and the antenna element used according to the traveling state of the vehicle is used. Radar devices of choice have been proposed.
  • an air layer 340 is interposed between the cover 304 and the substrate 303. Therefore, boundary surface reflection occurs due to the difference between the dielectric constant of the resin forming the cover and the dielectric constant of the air inside the cover (see the broken arrow 350 in FIG. 2). This boundary surface reflection attenuates the radio waves radiated from the antenna, lowers the reception sensitivity from obstacles, and the radio waves reflected by the cover are re-input to the antenna as multipath, which causes an obstacle when the sensor detects it. Become.
  • Patent Document 1 a resin is filled between the antenna and the cover as a sealing material, but since this resin is urethane foam, the dielectric constant is low and close to the dielectric constant of air. Therefore, radio waves in a wide angle direction are reflected between the resin and the cover, which also causes multipath.
  • the resonance frequency of the antenna fluctuates unless the antenna is designed corresponding to the dielectric constant of the bumper that differs depending on the vehicle model.
  • An object of the present invention is to provide a millimeter-wave radio wave sensor that suppresses fluctuations in the resonance frequency of an antenna while reducing multipath in a wide angle direction.
  • the present invention comprises an antenna element that radiates radio waves in a millimeter wave band, a substrate on which the antenna element is formed on the surface, a cover that covers the front side of the substrate, and one surface of the antenna element.
  • the resin has a resin whose other surface contacts the cover, and the thickness of the resin is four times or more the thickness of the substrate and four minutes of the wavelength of the radio wave passing through the resin. It was set to 1 or more.
  • the present invention it is possible to provide a millimeter-wave radio wave sensor that suppresses fluctuations in the resonance frequency of an antenna while reducing multipath in a wide angle direction.
  • the figure which shows the cross section from the RF circuit board to the cover which concerns on Example 2.
  • FIG. 1 is a cross-sectional view showing the configuration of the resin contact type millimeter wave radio wave sensor according to the first embodiment.
  • the radio wave sensor 100 of this embodiment includes an antenna element 101 that emits radio waves in the millimeter wave band, an RF circuit 102 that generates a radio wave signal, an RF circuit board 103, and a radome that protects the antenna.
  • the cover 104 and the like are provided.
  • the RF circuit board 103 is constructed by using a low dielectric loss / low dielectric constant material 105, and an antenna element 101 is formed on one surface (surface) of the RF circuit board 103, and the RF circuit board 103 is formed.
  • An RF circuit is provided on the other surface (back surface) of the above.
  • the cover 104 is made of a resin that easily transmits radio waves.
  • the substrate of the radio wave sensor 100 has a signal processing circuit board 107 in addition to the RF circuit board 103.
  • the signal processing circuit board 107 is constructed by using a glass epoxy resin material, and the signal processing circuit board 107 is used for a microcomputer that controls a metal conductor pattern 108, a microwave band antenna 109, and an RF circuit 102.
  • a signal processing circuit (including a power supply circuit) such as an IC 110 is formed.
  • the microwave band antenna 109 an antenna composed of F type, inverted F type, or both may be mounted by a metal conductor pattern.
  • the microcomputer IC 110 reads out a program that defines the operation of the RF IC stored in the storage area of the memory IC provided inside the microcomputer or on the board, and reads the program that defines the operation of the RF IC, and the RF circuit via the RF circuit board 103.
  • RFIC operation settings include transmission output port & reception input port to be used, transmission power value, variable amplifier gain value for reception sensitivity setting, transmission frequency band of RF circuit, frequency modulation form such as FMCW, FCW, 2CW, modulation.
  • the speed, the number of chapters in FCW, the sampling frequency of the received Doppler signal, the sampling timing, etc. are diverse.
  • the RF circuit 102 whose RF operation is defined generates a millimeter wave signal by an internal millimeter wave frequency generation circuit, passes through a multiplier, a power amplifier, and a power distributor in the RF circuit 102, and is one of the transmission output ports. A millimeter wave signal is output to one, a plurality of them, or all of them.
  • the generated millimeter-wave signal is propagated to the antenna element 101 via a high-frequency line (for example, a microstrip line, a coplanar line, a coplanar line with a ground, etc.) provided on the RF circuit board 103, and a radio wave is transmitted from the antenna element 101. Is radiated as.
  • the resin 121 is brought into contact with the conductor surface of the antenna element 101, and the resin 121 is also brought into contact with the back surface of the cover 104 covering the front side of the RF circuit board 103. That is, in this embodiment, by filling the region between the antenna element 101 and the cover 104 with the resin 121, one surface of the resin 121 comes into contact with the antenna element 101 and the other surface of the resin 121 comes into contact with the cover 104. It is composed. Therefore, the air layer does not exist in the radio wave propagation path from the antenna element 101 to the cover 104, and the boundary surface reflection due to the difference in the dielectric constant between the air in the cover 104 and the cover 104 can be prevented.
  • the multipath on the inside (back side) of the cover 104 is suppressed, and the disturbing noise received by the antenna element 101 is reduced. Further, since the antenna gain fluctuation due to the distance between the cover 104 and the antenna element 101 is also small, it is not necessary to strictly adjust the position of the antenna element 101 with respect to the cover 104.
  • the outside (front side) of the cover 104 since the outside (front side) of the cover 104 is in contact with air, some boundary surface reflection occurs when the radio wave passes through the cover 104 and goes to the outside.
  • the resin 121 having a dielectric constant of more than 1 as in the present embodiment, the reflection at the boundary surface of the radio wave is significantly suppressed.
  • the resin 121 it is desirable to use a resin having a dielectric constant of 2 or more, such as polytetrafluoroethylene, because a foam-based resin has a dielectric constant close to that of air and is easily reflected.
  • the thickness of the resin 121 is set to be 4 times or more the thickness of the RF circuit board 103 and ⁇ / 4 or more.
  • ⁇ is the wavelength of the radio wave passing through the inside of the resin 121, that is, the wavelength of the millimeter wave shortened by the dielectric constant of the resin 121.
  • the fluctuation of the resonance frequency of the antenna element can be reduced even if the cover 104 made of a material having a different dielectric constant is used.
  • the cover 104 made of a material having a different dielectric constant is used.
  • the change in the radiation characteristics of the radio wave sensor 100 can be suppressed by providing the resin 121 having the thickness as in this embodiment.
  • the RF circuit board 103 to the resin 121 The permittivity up to the cover 104 is monotonically increased or monotonically decreased. As a result, the reflectance coefficient on the contact surface due to the difference in permittivity (reflection coefficient due to characteristic impedance discontinuity) can be made smaller. Further, if a material is used in which the dielectric constant of the resin 121 is higher than the dielectric constant of the cover 104 or the dielectric constant of the RF circuit board 103, the above-mentioned reflection coefficient is slightly increased, but the hardness of the resin is utilized. It is also possible to make the sensor robust.
  • the high frequency line and the antenna element 101 provided on the RF circuit board 103 are usually designed with air as a medium in contact with the conductor surface of the RF circuit board 103.
  • the characteristic impedance of the high-frequency circuit and the antenna resonance frequency are set to desired values by designing the pattern in consideration of the dielectric constant of the resin 121. There is. For example, pattern design is performed such that the characteristic impedance of the line is set to 50 ⁇ and the line width is adjusted so that the reflection coefficient becomes smaller. If the radiation gain can be increased at a desired frequency in this way, the antenna size can be reduced due to the wavelength shortening effect.
  • the wiring propagation loss on the RF circuit board 103 deteriorates by about several tens of percent, but the received signal sensitivity is significantly higher than the influence of multipath of 10 dB. The amount of deterioration can be suppressed.
  • the RF circuit 102 is mounted on the surface opposite to the antenna element 101 with respect to the RF circuit board 103, the thickness of the resin 121 can be mounted thinner than the height of the RF circuit 102.
  • the signal processing circuit board 107 is located on the back side of the RF circuit board 103 with a space in between, it is possible to prevent the RF signal from being mixed into the signal processing circuit and becoming noise.
  • the cover 104 of this embodiment may be formed of an in-vehicle bumper.
  • radio waves are propagated from the antenna element 101 to the bumper through an insulator (resin) layer having a predetermined thickness with a small difference in dielectric constant, without passing through an air layer. Therefore, even when the millimeter-wave radio wave sensor is actually mounted on the vehicle, the radio wave radiation efficiency in a wide angle direction is improved.
  • FIG. 3 is a cross-sectional view showing the configuration of the resin contact type millimeter wave radio wave sensor according to the second embodiment.
  • the radio wave sensor 100 of this embodiment has a resin 121 and a resin 122 arranged separately from each other.
  • FIG. 4 is a plan view of the RF circuit board 103 as viewed from the front side.
  • the antenna element 101 includes a transmitting antenna element 201 which is a first antenna element and a receiving antenna element 202 which is a second antenna element.
  • Each antenna element is a planar antenna, and each antenna element has an aperture length of about ⁇ / 2 in order to obtain a wide-angle radiation range.
  • the layout shown in FIG. 4 is an example of an evenly spaced MIMO (Multi Input Multi Output) configuration.
  • the receiving antennas are arranged at an interval L of about ⁇ / 2
  • the transmitting antennas are arranged at an interval of about ⁇ / 2 ⁇ the number of receiving antennas (L ⁇ the number of receiving antennas).
  • the distance L between the receiving antennas is expressed by the following equation (1).
  • the distance between the receiving antennas is ⁇ / 2.
  • a conductor pattern serving as a high frequency line 211 for propagating millimeter waves Elements are provided on the upper surface of the RF circuit board 103.
  • the resin 121 of the present embodiment has a portion in which one surface is in contact with the transmitting antenna element 201 and a portion in which one surface is in contact with the receiving antenna element 202, and these portions are separated from each other. ..
  • the line loss increases. Therefore, the loss from the RF circuit 102 to the antenna is suppressed by preventing the resin from coming into contact with the surface of the high frequency line 211. ..
  • the resin 122 is also arranged in the GND pattern area of the RF circuit board 103 and between the adjacent high frequency lines 211.
  • the resin 121 and the resin 122 may all be formed of the same material, or may be formed of different materials.
  • the resin 122 is provided between the high frequency line 211 connecting the RF circuit 102 and the transmitting antenna element 201 and the high frequency line 211 connecting the RF circuit 102 and the receiving antenna element 202.
  • One side of the resin 122 is in contact with the RF circuit board 103, and the other side is also in contact with the cover 104.
  • the radio waves transmitted through the resin 122 can be further suppressed, and the effect of suppressing the resonance on the antenna surface of the radio wave sensor 100 is also expected. it can.
  • the resin 122 provided so as to surround the edge of the RF circuit board 103 also has an effect of suppressing radio wave leakage. Further, by providing the resin 122 at another appropriate place on the surface of the RF circuit board 103, the radio wave sensor 100 can be provided in a well-balanced manner even when the contact surface of the resin 121 is separated from the center of gravity of the RF circuit board 103. It is also possible to support.
  • FIG. 5 is a diagram showing a cross section from the RF circuit board 103 to the cover 104.
  • the thick arrow indicates that the radio wave radiated from the resonance pattern element 203 of the antenna element 101 passes through the inside of the cover 104 via the resin 121 and reaches the boundary surface with the air 141.
  • the GND electrode 204 of the antenna element 101 serves to shield the radio waves radiated from the antenna element 101 from leaking to the RF circuit 102 and the signal processing circuit board 107.
  • the radio wave radiated from the resonance pattern element 203 of the antenna having an aperture length of ⁇ / 2 size is a wavefront spreading on a spherical surface having a half width of about ⁇ 70 °. Radio waves whose incident angle exceeds ⁇ 45 ° with respect to the boundary surface are mirror-reflected and propagate while being multiple-reflected inside the cover 104 and the resin 121. Therefore, the radio wave radiated from the transmitting antenna element 201 and having an incident angle of more than ⁇ 45 ° reaches the receiving antenna element using the resin 121 as a waveguide, and deteriorates the isolation between the antenna elements.
  • isolation is suppressed by providing a resin 121 that individually contacts the transmitting antenna element 201 and the receiving antenna element 202 and dividing the waveguide by the resin 121. doing. Further, by narrowing the width of the resin 121 in contact with the antenna element 101 so that the critical angle ⁇ 2 is within ⁇ 45 °, specular reflection is suppressed and the resin 121 is efficiently radiated to the outside of the cover 104 (air 141). Is also possible.
  • FIG. 7 is a cross-sectional view showing the configuration of the resin contact type millimeter wave radio wave sensor according to the third embodiment.
  • the radio wave sensor 100 of this embodiment uses a hybrid substrate 131 in which a low dielectric loss / low dielectric constant material 105 and a glass epoxy resin material 106 are laminated.
  • the hybrid substrate 131 is a stack of an RF circuit board 103 and a signal processing circuit board 107 using a prepreg or the like. By stacking the substrates in this way, the wiring from the signal processing circuit to the RF circuit can be shortened, and mounting becomes easy.
  • the RF circuit 102 of this embodiment is formed on the surface of the hybrid substrate 131 like the antenna element 101. Therefore, by providing the resin 121 around the RF circuit 102, it is possible to prevent radio waves from the antenna element 101 from being mixed into the RF circuit 102. Further, since the resin 121 is provided so as to avoid the RF circuit 102, damage to the RF circuit 102 due to thermal expansion of the resin 121 can be prevented.
  • the resin 121 of this embodiment also has a thickness of ⁇ / 4 or more, which is four times or more the thickness of the RF circuit board 103, but is thinner than the RF circuit 102. Therefore, a recess is provided in the portion of the back surface of the cover 104 that faces the RF circuit 102.
  • FIG. 8 is a cross-sectional view showing the configuration of the resin contact type millimeter wave radio wave sensor according to the fourth embodiment.
  • the cover 104 has a curved surface shape
  • the RF circuit board 103 also has a curved surface shape corresponding to the cover 104.
  • the RF circuit board 103 of this embodiment is made of a flexible substrate that can be easily curved, and is filled with resin 121 according to the curved surface shapes of the cover 104 and the RF circuit board 103. According to this embodiment, the radio wave radiation efficiency in a wide angle direction is improved as compared with the radio wave sensor using the flat RF circuit board.
  • the connection with the signal processing circuit board can be easily made by terminalizing the end of the substrate, and the internal configuration of the radio wave sensor can be easily modified. Further, when either the RF circuit or the signal processing circuit is replaced, either one can be easily attached and detached.
  • FIG. 9 is a cross-sectional view showing the configuration of the resin contact type millimeter wave radio wave sensor according to the fifth embodiment.
  • the radio wave sensor 100 of this embodiment has a housing 111 that covers the back side of the substrate, and the substrate is sealed by the cover 104 and the housing 111. Further, a frame 114 is inserted between the RF circuit board 103 and the signal processing circuit board 107.
  • the cover 104 is provided with protrusions 112 and the RF circuit board 103 is provided with holes, it is possible to align the cover 104 with the RF circuit board 103 by using these.
  • the housing 111 is also provided with a protrusion 112 so that the housing 111 and the signal processing circuit board 107 can be aligned with each other. Then, with the RF circuit board 103, the frame 114, and the signal processing circuit board 107 sandwiched between the cover 104 and the housing 111, the cover 104 and the housing 111 are fixed using screws 113, and the radio wave sensor 100 It is unitized.
  • the RF circuit board 103 and the signal processing circuit board 107 are sealed from the outside air by the cover 104, the housing 111, and the frame 114, and the airtightness is maintained, so that the RF circuit board 103 and the signal processing circuit board 107 are protected from exhaust gas and the like that cause deterioration of the board. Further, by confining the resin 121 inside the cover 104, it is possible to prevent the resin 121 from absorbing water.
  • the frame 114 has a function of a shielding plate that electrically shields between the RF circuit board 103 and the signal processing circuit board 107.
  • the millimeter-wave signal of the RF circuit 102 tends to leak, and crosstalk tends to cause deterioration of the reception sensitivity of the radio wave sensor 100. Therefore, it is important to cover the RF circuit 102 with the GND surface of the RF circuit board 103 and the frame 114 in mounting the radio wave sensor 100.
  • the frame 114 is formed of a metal having high thermal conductivity (for example, copper or aluminum), the function of the heat sink is to propagate the heat generated by the RF circuit 102 or the IC 110 for a microcomputer, which consumes a large amount of power, to the outside. It is also possible to have.
  • the frame 114 supports the RF circuit board 103, the signal processing circuit board 107, the cover 104, and the housing 111. Therefore, by providing the screw hole 115 in the frame 114, the radio wave sensor 100 can be attached to a predetermined structure.
  • FIG. 10 is a cross-sectional view showing the configuration of a bumper equipped with the resin contact type millimeter wave radio wave sensor according to the sixth embodiment.
  • the radio wave sensor 100 is attached to the bumper 116 of the vehicle.
  • the bumper 116 of this embodiment is in contact with the cover 104 via the resin 121.
  • the resin 121 between the cover 104 and the bumper 116 is composed of an area through which radio waves radiated from the antenna element 101 are transmitted and an area arranged in a ring shape around the area.
  • the resin 121 in the area through which the radio waves are transmitted has an incident angle of the radio waves radiated from the bumper 116 of less than ⁇ 45 ° (for example, when the dielectric constants of the bumper 116, the cover 104, and the resin 121 are 2). , Processed according to the opening size of the antenna element 101. As a result, the radio wave from the antenna element 101 is propagated to the bumper 116 without passing through the air layer, and is radiated to the outside air. Further, the resin 121 in the area through which radio waves are transmitted is arranged for each antenna element 101, and the isolation between the antenna elements 101 is suppressed by separating each resin.
  • the resin 121 arranged in the annular area has a function of suppressing the deterioration of the resin 121 in the area through which radio waves are transmitted due to exhaust gas or water absorption. Further, by covering the head of the screw 113 with the resin 121 in the area arranged in an annular shape, it is possible to prevent exhaust gas, water, etc. from entering the inside of the radio wave sensor 100 through the screw hole provided in the cover 104. it can.
  • Examples 1 to 6 have been described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the described configurations. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to add / delete / replace a part of the configuration of each embodiment with another configuration.
  • Radio frequency sensor 101 ... Antenna element, 102 ... RF circuit, 103 ... RF circuit board, 104 ... Cover, 105 ... Low dielectric loss / low dielectric constant material, 106 ... Glass epoxy resin material, 107 ... Signal processing circuit board, 108 ... Metal conductor pattern, 109 ... Microwave band antenna, 110 ... Microcomputer IC, 111 ... Housing, 112 ... Projection, 113 ... Screw, 114 ... Frame, 115 ... Screw hole, 116 ... Bumper, 121, 122 ... Resin, 131 ... hybrid substrate, 141 ... air, 201 ... transmitting antenna element, 202 ... receiving antenna element, 203 ... resonance pattern element, 204 ... GND electrode, 211 ... high frequency line

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  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Security & Cryptography (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Abstract

L'objectif de la présente invention est de fournir un capteur d'ondes radio millimétriques qui supprime un changement de fréquence de résonance d'une antenne tout en réduisant un trajet multiple d'azimut grand angle. A cet effet, la présente invention comprend : un élément d'antenne qui rayonne des ondes radio dans une bande d'ondes millimétriques ; un substrat ayant une surface sur laquelle est formé l'élément d'antenne ; un couvercle qui recouvre le côté avers du substrat ; et une résine ayant une surface en contact avec l'élément d'antenne et l'autre surface en contact avec le couvercle. L'épaisseur de la résine est fixée à au moins un quadruple de l'épaisseur du substrat et non inférieure à un quart de la longueur d'onde des ondes radio traversant la résine.
PCT/JP2020/039065 2019-11-28 2020-10-16 Capteur d'ondes radio millimétriques et véhicule le comportant WO2021106418A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112020004943.4T DE112020004943T5 (de) 2019-11-28 2020-10-16 Millimeterfunkwellensensor und fahrzeug, das ihn enthält

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-215298 2019-11-28
JP2019215298A JP7370829B2 (ja) 2019-11-28 2019-11-28 ミリ波電波センサ及びこれを備えた車両

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WO2021106418A1 true WO2021106418A1 (fr) 2021-06-03

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DE (1) DE112020004943T5 (fr)
WO (1) WO2021106418A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210305720A1 (en) * 2020-03-31 2021-09-30 University Of Massachusetts Wireless system on flexible substrate
WO2023140261A1 (fr) * 2022-01-18 2023-07-27 株式会社クラレ Système d'antenne, son procédé de fabrication et son procédé de conception
WO2023195359A1 (fr) * 2022-04-08 2023-10-12 株式会社デンソー Dispositif de télémétrie

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WO2023140261A1 (fr) * 2022-01-18 2023-07-27 株式会社クラレ Système d'antenne, son procédé de fabrication et son procédé de conception
WO2023195359A1 (fr) * 2022-04-08 2023-10-12 株式会社デンソー Dispositif de télémétrie

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