WO2020075422A1 - レドーム - Google Patents

レドーム Download PDF

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Publication number
WO2020075422A1
WO2020075422A1 PCT/JP2019/034660 JP2019034660W WO2020075422A1 WO 2020075422 A1 WO2020075422 A1 WO 2020075422A1 JP 2019034660 W JP2019034660 W JP 2019034660W WO 2020075422 A1 WO2020075422 A1 WO 2020075422A1
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WO
WIPO (PCT)
Prior art keywords
radome
film
resin film
region
dielectric constant
Prior art date
Application number
PCT/JP2019/034660
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
永石　英幸
中條　徳男
隆史 松村
大坂　英樹
Original Assignee
日立オートモティブシステムズ株式会社
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 日立オートモティブシステムズ株式会社 filed Critical 日立オートモティブシステムズ株式会社
Priority to DE112019004404.4T priority Critical patent/DE112019004404T5/de
Publication of WO2020075422A1 publication Critical patent/WO2020075422A1/ja

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    • 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
    • G01S7/03—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
    • H01Q1/42—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
    • 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 radome, and more particularly to a radome that covers a millimeter wave radar mounted on an automobile or the like.
  • Doppler sensors or radar sensors that use radio waves are known as peripheral detection sensors for safe operation or safe operation.
  • an automobile will be mainly described below as an example of a vehicle.
  • a radar for a front of a car and for a long distance has a maximum detection distance of 200 m so that the car can be safely stopped even when traveling on an autobahn or the like without a speed limit at a speed of 200 km / h.
  • a high-gain characteristic of the antenna can be obtained by applying a narrow-angle beam with a horizontal azimuth detection range of ⁇ 8 deg or more and a vertical azimuth half-value width of ⁇ 2 deg or less. ing.
  • the thickness of the radome which is a resin film covering the radar, to be an integral multiple of ⁇ / 2, and using standing waves, it is possible to use air with different dielectric constants. Even at the interface with the resin film, it is possible to minimize deterioration of the radio wave transmission characteristics.
  • the radome thickness in the transmission direction is required.
  • a millimeter-wave radar having an antenna array composed of multiple antennas requires curved radomes that have the same distance from multiple radiation sources. It is very difficult to suppress the variation of.
  • a design in which a curved radome is locally applied only to a portion of the bumper through which radio waves pass is not desired from the viewpoint of vehicle design. .
  • Patent Document 1 discloses a technique that uses a physical law.
  • a bumper made of a resin film is installed in the emission direction of a radio wave of a millimeter wave radar, the incident angle of the radio wave on the resin film is referred to as Brewster's angle.
  • a matched bumper structure is disclosed.
  • Patent Document 2 discloses a technique in which a radar is directly mounted on a bumper made of a resin film.
  • the bumper and the millimeter wave radar are connected using a horn-shaped bracket, and the bumper and the millimeter-wave radar are connected according to the opening diameter of the horn antenna.
  • a structure in which a hole is provided in a bumper is disclosed.
  • Patent Document 3 discloses a technique for suppressing reflection by processing a part of a bumper made of a resin film as a mountain having an uneven shape.
  • Patent Document 1 can minimize the reflection intensity by matching only a part of the wide-angle radiation range of the antenna with the Brewster angle. However, most of the wide-angle detection angles have a problem that reflection cannot be suppressed.
  • the bumper disclosed in Patent Document 2 can reduce unnecessary reflection in the propagation path of radio waves by making a hole in the bumper.
  • the wave front of the radio wave is flattened inside the tapered horn, the antenna gain in the wide-angle azimuth is low and it is not suitable for wide-angle detection.
  • foreign matter such as dust or dirt may be mixed in while the vehicle is traveling, or water droplets may be mixed in during rain, and these problems deteriorate the antenna characteristics.
  • a plurality of pyramid-shaped uneven portions are provided in an array on the surface of the bumper on the radar side, and the height of the base up to the uneven portion is an odd number of 1/4 of the wavelength. Doubled.
  • the radio waves emitted from the radar device pass through the uneven portion and reach the inside of the bumper.
  • the radio wave is specularly reflected at the critical angle caused by the difference between the dielectric constant of the bumper and the dielectric constant of air. If the range of angle detection of the radar device is within the range of the critical angle, the reflection intensity is small, but for example, in the case of a resin film having a dielectric constant of about 4 (refractive index of about 2), the critical angle becomes 45 degrees or more. In the angle azimuth direction, the transmitted power decreases, so the sensitivity of the radar device decreases.
  • the bumper surface is provided with pyramid-shaped irregularities, mud, water, dirt, etc. will adhere to the bumper surface in an environment where automobiles are normally used, so that good millimeter wave transmission characteristics are maintained. Difficult to do. Furthermore, if the bumper surface is coated with the bumps and dips on the bumper surface being exposed, the paint is embedded in the bumps and depressions, so that the pyramid-shaped function cannot be maintained. Providing the uneven portion on the surface of the bumper is not practical in terms of the design of the vehicle.
  • the present inventors considered reducing the dielectric constant of the resin film from the viewpoint of suppressing the reflection intensity on the bumper surface.
  • vehicles such as automobiles, railroads, airplanes, and ships have been increasingly electrified and have reduced fuel consumption.
  • improvements have been made to reduce the weight of the vehicle body as part of the reduction in fuel consumption, and in order to reduce the weight, foaming of a resin film which is a material for a bumper is being studied. Further, by promoting foaming of the resin film, lowering of the dielectric constant of the resin film is also promoted.
  • the surface side of the bumper is required to have hardness and smoothness, so there are few bubbles in the foamed resin film. Then, many bubbles of the foamed resin film are contained inside the bumper. That is, the dielectric constant of the foamed resin film forming the bumper is large on the surface of the bumper and small inside the bumper. Further, since the bumper using the foamed resin film also pays attention to the mechanical strength, the foamed resin film has a foaming rate of about 50% and the foamed resin film has a dielectric constant of about 2.4. Such a value is not sufficiently small to suppress reflection on the bumper surface.
  • the millimeter-wave radar antenna is easily affected by the environment outside the antenna, so the antenna is mechanically and environmentally protected by a resin film radome or bumper that easily transmits radio waves. Then, even if the antenna used for the millimeter-wave radar for automobiles is a radar antenna for a long distance, wide-angle detection performance with a half value width in the horizontal direction of ⁇ 30 deg to ⁇ 60 deg is required. There is.
  • the antenna has a wide-angle radiation range
  • the transmitted power is attenuated by reflection on the surface of the radome that protects the antenna
  • the wide-angle radiation characteristic of the antenna is sacrificed, and the sensitivity of the antenna decreases,
  • the reflected power is re-input into the antenna as a multipath.
  • interference noise occurs in radar detection.
  • the radome is required to have a structure that achieves both low dielectric constant of the material forming the radome and mechanical strength capable of withstanding the usage environment. That is, it is required to improve the performance of a covering member such as a radome that covers a radar or the like.
  • the radome which is one embodiment has a resin film having a front surface and a back surface, a first film formed on the front surface side of the resin film, and a second film formed on the back surface side of the resin film.
  • the dielectric constant of the substance existing between the first film and the resin film and the dielectric constant of the substance existing between the second film and the resin film are lower than the dielectric constant of the resin film, respectively.
  • FIG. 3 is a cross-sectional view showing the radome of the first embodiment, and is a schematic view showing the relationship between the radome and the radar.
  • FIG. 3 is a perspective view showing a resin film according to the first embodiment.
  • FIG. 3 is a perspective view showing a resin film according to the first embodiment.
  • FIG. 3 is a perspective view showing a resin film according to the first embodiment.
  • FIG. 6 is a plan view showing a resin film according to a second embodiment. It is sectional drawing which shows the radome of Embodiment 2, and is a schematic diagram which shows the relationship between a radome and a radar. It is sectional drawing which shows the radome of the modification 1, and is a schematic diagram which shows the relationship between a radome and a radar.
  • FIG. 1 is a cross-sectional view showing a radome 100 according to this embodiment, and is a schematic view showing a relationship between the radome 100 and a radar 200.
  • the radome 100 constitutes the whole or a part of a bumper attached to the front of the automobile, and the radar 200 mounted inside the automobile is covered by the radome 100.
  • the Z direction shown in the figure is the thickness direction of the radome 100, and the direction from the back film 103 to the front film 102 is the front direction of the automobile.
  • the X direction is the side direction of the automobile and the Y direction is the height direction of the automobile. These X direction, Y direction and Z direction are orthogonal to each other.
  • the radome 100 includes a resin film 101 having a front surface and a back surface, a surface film 102 formed on the front surface side of the resin film 101, and a back film 103 formed on the back surface side of the resin film 101.
  • a resin film 101 having a front surface and a back surface
  • a surface film 102 formed on the front surface side of the resin film 101
  • a back film 103 formed on the back surface side of the resin film 101.
  • the front surface side of the resin film 101 is the outside of the automobile
  • the back surface side of the resin film 101 is the inside of the automobile.
  • a radar 200 is mounted inside the vehicle.
  • the radar 200 is a millimeter wave radar and has a plurality of antennas 201 and an RF circuit (high frequency circuit) 202 electrically connected to the plurality of antennas 201.
  • the plurality of antennas 201 are provided in an array and include transmitting and receiving antennas.
  • the RF circuit 202 generates a millimeter wave signal inside, and the millimeter wave signal is radiated from the antenna 201 for transmission to the outside of the automobile via the radome 100.
  • the radiated millimeter wave signal reaches the target, and the millimeter wave signal reflected (scattered) by the target is received by the receiving antenna 201 via the radome 100.
  • the wavelength is, for example, 3 mm
  • the frequency is, for example, 77 GHz band or 79 GHz band.
  • the resin film 101 is made of synthetic resin, for example, polypropylene or polystyrene, and has a thickness of, for example, 30 to 50 ⁇ m.
  • the dielectric constant of the resin film 101 is 3.0, for example.
  • the resin film 101 of the present embodiment has a corrugated board structure and has an uneven shape. That is, the resin film 101 has a shape in which a concave portion projecting to the back surface side of the resin film 101 and a convex portion projecting to the front surface side of the resin film 101 are alternately repeated. Further, the resin film 101 is formed such that its surface is inclined with respect to the traveling direction of the radio wave transmitted through the inside of the radome 100.
  • FIGS 2 to 4 are perspective views each showing an example of the shape of the resin film 101.
  • the resin film 101 has a structure forming a one-dimensional triangular waveform, and includes a triangle formed by the resin film 101 and the front surface film 102 and a triangle formed by the resin film 101 and the back surface film 103.
  • it is a so-called truss structure, which is a structure that is continuously connected. That is, in cross-sectional view, the shape of the resin film 101 between the apex 105 of the concave portion and the apex 104 of the convex portion is linear.
  • the resin film 101 has a structure that forms a one-dimensional sine waveform. That is, in cross-sectional view, the shape of the resin film 101 between the apex 105 of the concave portion and the apex 104 of the convex portion is curved.
  • the structure of FIG. 2 has high strength against pressure from a direction perpendicular to the surface of the radome 100 (the front surface of the automobile).
  • the structure of FIG. 3 has high strength against pressure from a direction perpendicular to the surface of the radome 100, and is higher than the structure of FIG. 2 against pressure from a direction oblique to the surface of the radome 100. Have strength.
  • the resin film 101 between the apex 105 of the concave portion and the apex 104 of the convex portion has a curved shape in a cross-sectional view, but the resin film 101 has a two-dimensional shape. It has a structure that forms the waveform of a typical trigonometric function.
  • Such a structure of FIG. 4 has higher strength than the structures of FIGS. 2 and 3 against pressure from directions perpendicular to the surface of the radome 100 and oblique directions.
  • the resin film 101 having the concave portion and the convex portion preferably has the shape shown in FIGS. 2 to 4. It only has to have an oblique shape.
  • the shapes of the concave portion and the convex portion may be pyramidal, conical, hemispherical, or semielliptic, respectively. Further, these shapes may be applied to all or a part of the plurality of concave portions and the plurality of convex portions.
  • the period of the wave composed of the triangular waveform or the sine waveform is set to be less than the wavelength of the millimeter wave transmitted through the radome 100. That is, the cycle in which the pair of concave and convex portions is formed is less than the wavelength of the millimeter wave transmitted through the radome 100.
  • the resin film 101 is bonded to the front surface film 102 and the back surface film 103. Specifically, the resin film 101 is adhered to the front surface film 102 at the apex 104 of the convex portion and adhered to the back surface film 103 at the apex 105 of the concave portion. Therefore, a desired substance can be present between the resin film 101 and the front surface film 102 and between the resin film 101 and the back surface film 103. In the present embodiment, air AIR is exemplified as such a substance.
  • a resin film is preferably used for each of the front surface film 102 and the rear surface film 103 as a material having solvent resistance to a water-based or oil-based coating material and environment resistance.
  • each of the front surface film 102 and the back surface film 103 is made of a plate-shaped synthetic resin, for example, polyphenylene sulfide (PPS).
  • Each of the front surface film 102 and the rear surface film 103 is formed of a resin material having a higher dielectric constant and higher hardness than the resin film 101 in order to improve mechanical strength.
  • each of the front surface film 102 and the back surface film 103 is sufficiently smaller than the wavelength used in the radar 200 and is a thickness that allows millimeter waves to pass therethrough, for example, 50 to 100 ⁇ m. Therefore, it is possible to ensure the transparency of the millimeter wave that passes through the radome 100.
  • the thickness of the region where the uneven resin film 101 and the air AIR are present, that is, the distance between the front surface film 102 and the back surface film 103 is, for example, 3 to 5 mm.
  • air AIR having a lower dielectric constant than resin film 101 exists between resin film 101 and front surface film 102 and between resin film 101 and rear surface film 103. There is. Air AIR has a dielectric constant of 1.0.
  • the resin film 101 is also formed inside the radome 100, since the resin film 101 is thin and is made of a material having a low dielectric constant, the equivalent dielectric constant in the entire radome 100 can be kept low. In other words, since the dielectric constant averaged by the air AIR and the resin film 101 can be regarded as an equivalent dielectric constant, in the radome 100 of the present embodiment, the radome 100 is composed of the resin film 101. Also, the dielectric constant can be lowered.
  • the permittivity inside the radome 100 can be made closer to the permittivity outside the radome 100 (permittivity of air). Further, the thickness of each of the front surface film 102 and the back surface film 103 is such that millimeter waves can be transmitted. Therefore, when the millimeter wave reflected from the target outside the vehicle passes through the inside of the radome 100, the millimeter wave is received by the radar 200 without being substantially attenuated.
  • the resin film 101 is formed in an uneven shape inside the radome 100, and the surface of the resin film 101 is inclined with respect to the traveling direction of the radio wave that passes through the inside of the radome 100. Further, in the concavo-convex shape, the cycle in which the pair of concave and convex portions is formed is less than the wavelength of the millimeter wave transmitted through the radome 100.
  • the millimeter wave passes through the resin film 101 and the air AIR inside the radome 100.
  • the dielectric constant inside the radome 100 is gently changed by the resin film 101 and the air AIR, so that reflection and refraction of millimeter waves can be suppressed. That is, inside the radome 100, it is difficult for mirror reflection of millimeter waves to occur.
  • the characteristic impedance of the radome 100 can be changed stepwise from the surface film 102 side to the inside of the radome 100, so that the characteristics of the inside of the radome 100 and the air AIR outside the radome 100. The impedance ratio is minimized.
  • the uneven resin film 101 may be formed of a foamed resin film.
  • the dielectric constant of the resin film 101 itself can be further reduced, the equivalent dielectric constant inside the radome 100 can be further reduced.
  • the radome 100 of the present embodiment is provided so as to sufficiently cover the radiation range of the antenna 201, it becomes possible to suppress the reflection intensity of millimeter waves. As a result, multipath due to irregular reflection is reduced, erroneous detection of the radar 200 is suppressed, and the detection accuracy of the radar 200 can be improved.
  • the uneven resin film 101 formed between the front surface film 102 and the rear surface film 103 serves as a pillar. Therefore, the mechanical strength of the radome 100 itself can be improved. That is, the radome 100 of the present embodiment can improve the mechanical strength of the radome 100 to such an extent that the radome 100 can withstand a use environment such as an automobile without lowering the detection accuracy of the radar 200.
  • the performance of the radome 100 that covers the radar 200 can be improved.
  • FIG. 5 is a plan view of the resin film 101 according to the second embodiment, which is a plan view parallel to the XY plane. In the following description, differences from the first embodiment will be mainly described.
  • the entire resin film 101 has an uneven shape inside the radome 100, but in the second embodiment, a part of the resin film 101 has an uneven shape.
  • the resin film 101 of the second embodiment includes a transparent region 101A and a fixed region 101B integrated with the transparent region 101A.
  • the resin film 101 in the transmissive region 101A has an uneven shape as in the first embodiment.
  • the resin film 101 in the fixed area 101B is formed thicker than the resin film 101 in the transmissive area 101A so as to fill the space between the front surface film 102 and the back surface film 103.
  • Such a resin film 101 can be manufactured by changing the shape of the mold.
  • the front surface film 102 adheres to the front surface of each resin film 101 in the transmissive area 101A and the fixed area 101B, and the back surface film 103 adheres to the rear surface of each resin film 101 in the transmissive area 101A and the fixed area 101B.
  • the front surface film 102 and the back surface film 103 are formed so as to sandwich the resin film 101 in each of the transmissive region 101A and the fixed region 101B.
  • the transmission region 101A is provided only in the region where the millimeter wave is desired to be transmitted, according to the range of the angle detection of the radar 200.
  • the radar 200 is arranged so as to overlap the transmission area 101A and to be included in the transmission area 101A in a plan view (front view of the vehicle).
  • the detection accuracy of the radar 200 can be improved.
  • the mechanical strength of the radome 100 as a whole can be further improved by increasing the thickness of the resin film 101.
  • the front surface film 102 and the rear surface film 103 are formed only in the transmissive area 101A and not in the fixed area 101B. That is, the front surface and the back surface of the resin film 101 in the fixed region 101B are exposed from the front film 102 and the back film 103, respectively.
  • the radome 100 does not constitute the entire bumper of the automobile, but is a member attached to the base material 106 which is the bumper, and constitutes a part of the bumper. There is.
  • the radome 100 can be mounted on the base material 106 by providing, for example, an adhesive in the gap between the radome 100 and the base material 106.
  • the radar 200 is The radome 100 can be selectively attached to the place where it is arranged. Therefore, the degree of freedom in designing the bumper can be increased. Further, since the radome 100 of the modified example 2 is a structure having a size corresponding to the above-mentioned transmission area 101A, the detection accuracy of the radar 200 does not deteriorate as compared with the other embodiments.
  • the radome 100 and the base material 106 can be manufactured separately. Therefore, for example, the bumper, which is the base material 106, is manufactured on a manufacturing line of a predetermined factory, the radome 100 is manufactured on another manufacturing line or another factory, and they are finally combined to complete the bumper. You can also
  • Modification 2 as in Modification 1, only the portion corresponding to the transmissive region 101A is partially heated to bond the front surface film 102 and the back surface film 103 to the radome 100, thus improving the bonding accuracy. Therefore, it is possible to suppress the manufacturing cost associated with the film itself and the film adhesion.
  • a coating film 107 made of a material different from that of the surface film 102 is formed on the surface of the surface film 102 having solvent resistance.
  • a liquid obtained by diluting a base coat, which is a mixture of an aqueous or oily coating material and a curing agent, with thinner is used, and the coating film 107 is obtained by drying the liquid.
  • the coating film 107 may be formed by a printing technique. Further, even when a material such as a paint contains a metal such as indium, the thickness of the coating film 107 is set to 1/10 or less of the skin effect thickness (the conductor resistivity is 1 ⁇ or more). To do.
  • the thickness of the coating film 107 is sufficiently thinner than the wavelength used in the radar 200 and is a thickness that allows millimeter waves to pass through, and is, for example, 50 ⁇ m.
  • the total thickness of the coating film 107 and the surface film 102 is also a thickness that allows millimeter waves to pass therethrough.
  • the foamed resin film FP1 is filled between the resin film 101 and the surface film 102.
  • the foamed resin film FP1 has a higher foaming rate than the resin film 101 and has a foaming rate of about 50 to 800%.
  • the dielectric constant of the foamed resin film FP1 is lower than the dielectric constant of the resin film 101, and is, for example, 1.05 to 2.4. That is, the dielectric constant of the foamed resin film FP1 is about 2.4 when the foaming rate is 50%, and about 1.05 when the foaming rate is 800%.
  • the substance existing between the resin film 101 and the surface film 102 is air AIR having a dielectric constant of 1.0.
  • the foamed resin film FP1 is used instead of the air AIR. Has been applied. Therefore, the equivalent dielectric constant inside the radome 100 of the fourth embodiment is slightly higher than that of the first embodiment.
  • the mechanical strength of the radome 100 can be improved by applying the foamed resin film FP1 having a hardness higher than that of the air AIR and adhering the foamed resin film FP1 to the surface film 102. .
  • the surface film 102 may bend, the shape formed by the resin film 101 and the surface film 102 may change, and the equivalent dielectric constant may change.
  • a strong pressure is applied to the surface film 102 due to the wind pressure received by the automobile while the automobile is running.
  • the characteristic impedance inside the radome 100 may change, and the wavelength received by the radar 200 may shift. Therefore, by filling the space between the resin film 101 and the surface film 102 with a substance having higher mechanical strength than the air AIR, such as the foamed resin film FP1, the possibility that the surface film 102 will bend is reduced, and Such a fear can be suppressed.
  • a substance having higher mechanical strength than the air AIR such as the foamed resin film FP1
  • a hole 108 penetrating the back film 103 is formed in a part of the back film 103, and a hole 109 penetrating the resin film 101 is formed in a part of the resin film 101. Are formed.
  • the air AIR exists inside the radome 100 according to the fifth embodiment, but the air AIR inside the radome 100 expands or contracts when the temperature changes due to, for example, changes in the weather. For example, when the temperature decreases, the air contracts and the pressure inside the radome 100 decreases. Further, when the temperature rises, the air expands and the pressure inside the radome 100 increases. Then, inside the radome 100, a deviation may occur with respect to the thickness of the air AIR, the equivalent dielectric constant may change, and the characteristic impedance may change.
  • the pressure outside the radome 100 and the pressure inside the radome 100 can be made substantially the same. Therefore, the above fear can be suppressed.
  • each of the holes 108 and 109 may be such that air can enter, and is larger than, for example, nitrogen molecules (N 2 ) and oxygen molecules (O 2 ). Further, it is desirable that these sizes are such that a liquid cannot penetrate, and it is desirable that they are smaller than water molecules (H 2 O), for example.
  • the case where one hole 108 and one hole 109 are provided is illustrated, but a plurality of holes 108 may be provided in the back film 103 and a plurality of holes 109 may be provided in the resin film 101. Further, in the region where the millimeter wave is transmitted, it is desirable that the equivalence of the millimeter wave is as uniform as possible at each place. Therefore, it is preferable that the holes 108 and 109 are provided at the places where the millimeter wave is not transmitted. .
  • the foamed resin film FP1 described in the fourth embodiment is filled between the resin film 101 and the front surface film 102, and the back surface film 103 is formed in the fifth embodiment.
  • the holes 108 described are provided. Therefore, in Modification 3, the foamed resin film FP1 can be applied to improve the mechanical strength of the radome 100. Further, by applying the holes 108, the pressure outside the radome 100 and the radome 100 can be improved. The pressure inside 100 can be about the same.
  • the resin film 101 having an uneven shape was formed inside the radome 100, but in Embodiment 6, between the front surface film 102 and the back surface film 103, It is filled with the foamed resin film FP2.
  • the foamed resin film FP2 is a resin film similar to the foamed resin film FP1, has a higher foaming rate than the resin film 101, and has a foaming rate of about 50 to 800%. Further, the dielectric constant of the foamed resin film FP1 is lower than the dielectric constant of the resin film 101, and is, for example, 1.05 to 2.4.
  • the foaming rate of the foamed resin film FP2 is not uniform and varies in the thickness direction (Z direction), and the foamed resin film FP2 goes from the front film 102 and the back film 103 toward the center of the foamed resin film FP2. And then gradually (continuously) lower. That is, the dielectric constant of the foamed resin film FP2 gradually (continuously) decreases from the center of the foamed resin film FP2 toward the front surface film 102 and the back surface film 103, respectively.
  • the foamed resin film FP2 in the thickness direction (Z direction) of the foamed resin film FP2, the foamed resin film FP2 has a first region closer to the center of the foamed resin film FP2, a second region closer to the surface film 102 than the first region, and , And has a third region closer to the back film 103 than the first region. Then, the foaming rate of the foamed resin film FP2 in the second area and the third area is higher than the foaming rate of the foamed resin film FP2 in the first area, and the dielectric constant of the foamed resin film FP2 in the second area and the third area is , Lower than the dielectric constant of the foamed resin film FP2 in the first region.
  • the front surface film 102 and the back surface film 103 are partially bonded to the foamed resin film FP2 at locations other than bubbles in the foamed resin film FP2. Therefore, an adhesive for bonding the front surface film 102 and the rear surface film 103 to the foamed resin film FP2 is not necessary, and an increase in the dielectric constant inside the radome 100 can be suppressed.
  • the foamed resin film FP2 Since the resin film forming the foamed resin film FP2 has a high foaming rate, the foamed resin film FP2 has many gaps, is mechanically fragile, and has a drawback of adsorbing or absorbing various gases. Have. However, as in the sixth embodiment, the front surface film 102 and the rear surface film 103 having solvent resistance to a water-based or oil-based coating material and high environmental resistance are formed on the front surface and the back surface of the foamed resin film FP2. By doing so, such a defect can be compensated.
  • the equivalent dielectric constant inside the radome 100 is higher than that in the first embodiment.
  • the mechanical strength of the radome 100 can be improved as compared with the first embodiment.
  • the coating film 107 described in the third embodiment can be formed on the surface film 102 of the sixth embodiment.
  • the entire radome 100 is curved. Specifically, the radome 100 is curved so as to warp in the direction from the back film 103 to the front film 102.
  • the radome 100 of FIG. 1 is prepared, and then the radome 100 is appropriately softened until the resin film 101, the front surface film 102, and the back surface film 103 are softened. This can be achieved by heating 100 and then subjecting the radome 100 to curved processing by press molding.
  • the resin film 101 is formed into a concavo-convex shape so that the entire resin film 101 has a curved shape, and then to bond the front surface film 102 and the back surface film 103 to the resin film 101, it is actually difficult. Is. As in the seventh embodiment, after the front surface film 102 and the back surface film 103 are bonded to the uneven resin film 101, the entire radome 100 is curved using press molding, so that the radome 100 with high processing accuracy is obtained. Can be formed.
  • the curved radome 100 can meet various vehicle design requirements.
  • the radome 100 is a bumper attached to the front of the automobile has been described, but the radome 100 may be applied to a bumper attached to the rear or side of the automobile.
  • the radome 100 covering the radar 200 is mainly used for an automobile.
  • a radome 100 is used for another vehicle such as a railroad, an aircraft or a ship. You can also

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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)
  • Details Of Aerials (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Radar Systems Or Details Thereof (AREA)
PCT/JP2019/034660 2018-10-12 2019-09-03 レドーム WO2020075422A1 (ja)

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DE112019004404.4T DE112019004404T5 (de) 2018-10-12 2019-09-03 Radom

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KR20230124917A (ko) * 2020-12-25 2023-08-28 닛토덴코 가부시키가이샤 전파 산란체 및 전파 산란체를 구비하는 전파를 감쇠시키기 위한 부재
JPWO2023003033A1 (de) * 2021-07-21 2023-01-26

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003229712A (ja) * 2002-01-31 2003-08-15 Kanazawa Inst Of Technology 多層レードーム板およびその製造方法
JP2008249678A (ja) * 2007-03-02 2008-10-16 Toyota Central R&D Labs Inc レーダ装置の被覆部品及び貼着部品
US20130321236A1 (en) * 2012-05-29 2013-12-05 Fredric Paul Ziolkowski Lightweight, multiband, high angle sandwich radome structure for millimeter wave frequencies
WO2017026209A1 (ja) * 2015-08-07 2017-02-16 株式会社東海理化電機製作所 電波透過部品

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003229712A (ja) * 2002-01-31 2003-08-15 Kanazawa Inst Of Technology 多層レードーム板およびその製造方法
JP2008249678A (ja) * 2007-03-02 2008-10-16 Toyota Central R&D Labs Inc レーダ装置の被覆部品及び貼着部品
US20130321236A1 (en) * 2012-05-29 2013-12-05 Fredric Paul Ziolkowski Lightweight, multiband, high angle sandwich radome structure for millimeter wave frequencies
WO2017026209A1 (ja) * 2015-08-07 2017-02-16 株式会社東海理化電機製作所 電波透過部品

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