CN110483835B - Wave-absorbing material for 77GHz millimeter wave radar test - Google Patents
Wave-absorbing material for 77GHz millimeter wave radar test Download PDFInfo
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- CN110483835B CN110483835B CN201910780414.3A CN201910780414A CN110483835B CN 110483835 B CN110483835 B CN 110483835B CN 201910780414 A CN201910780414 A CN 201910780414A CN 110483835 B CN110483835 B CN 110483835B
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
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- C08K3/042—Graphene or derivatives, e.g. graphene oxides
Abstract
The invention relates to the technical field of wave-absorbing materials, in particular to processing of a wave-absorbing material for a high-frequency electromagnetic wave test. The wave-absorbing material is formed by immersing conductive feed liquid into a base material in a mode of rolling the base material by a roller press; the base material is made of polyurethane sponge with the opening rate of 90 percent, and comprises the following components: a base plate and a mastoid structure; the base plate is of a rectangular plate-shaped structure with the height of 20mm, and a plurality of mastoid structures with the height of 55 are processed on one side of the base plate in an array manner; the row spacing and the column spacing of the mastoid structure vertexes are both 35 mm. The roll squeezer is three-roller linkage structure, goes up two parallel rollers and controls the feed volume at 1.5 millimeters through the roller interval control, and two vertical rollers are 5 millimeters control to the pressure of substrate through controlling the roller interval. When rolling, the mastoid structure is relatively well buckled, and the front and back surfaces of the roller press are repeatedly rolled. The technical scheme of the invention solves the problem that the existing wave-absorbing material in the prior art cannot meet the test requirement of 77GHz millimeter waves.
Description
Technical Field
The invention relates to the technical field of wave-absorbing materials, in particular to processing of a wave-absorbing material for a high-frequency electromagnetic wave test.
Background
In the automobile field of rapid development today, the millimeter wave radar is because of its transmission distance is far away, and atmospheric attenuation and loss are low in the transmission window, and the penetrability is strong, can satisfy the requirement of vehicle to the adaptability of all-day weather, and the leading sensor that becomes ADAS system and autopilot. The frequency ranges of the millimeter wave radar of the mainstream automobile at home and abroad are 24GHz (used for short-medium distance radar of 15-30 m) and 77GHz (used for long-distance radar of 100-200 m), wherein the 77GHz millimeter wave radar has smaller volume, higher detection precision and longer detection distance, and developed countries begin to upgrade and switch to 77 GHz. With the application of high-frequency radar, the demand for wave-absorbing materials suitable for high-frequency radar testing is increasing. The traditional wave-absorbing material is generally only suitable for testing the frequency below 40GHz and cannot meet the test requirement of 77 GHz.
Aiming at the problems in the prior art, a novel wave-absorbing material for testing a 77GHz millimeter wave radar is researched and designed, so that the problem in the prior art is very necessary to be overcome.
Disclosure of Invention
According to the technical problem that the conventional wave-absorbing material provided by the above is generally only suitable for testing the frequency below 40GHz and cannot meet the test requirement of 77GHz millimeter waves, the wave-absorbing material for testing 77GHz millimeter wave radar is provided. The invention mainly utilizes polyurethane sponge with the aperture ratio of 90% as a base material to prepare a single-side mastoid shape, and the polyurethane sponge is obtained by pressing conductive liquid into the base material in a rolling way, thereby meeting the test requirement of 77GHz millimeter waves.
The technical means adopted by the invention are as follows:
a wave-absorbing material for testing a 77GHz millimeter wave radar is formed by immersing conductive liquid into a base material in a manner that the base material is rolled by a roll squeezer;
further, the substrate is made of open-cell polyurethane sponge, and comprises: a base plate and a mastoid structure; the base plate is of a rectangular plate-shaped structure, and a plurality of mastoid structures are processed on one side of the base plate in an array mode.
Further, the open porosity of the substrate was 90%.
Further, the height of the substrate is 15-25 mm.
Further, the height of the mastoid structure is 55-65 mm.
Further, the row spacing and the column spacing of the mastoid structure apexes are both 35 mm.
Further, the formula of the conductive liquid of the wave-absorbing material for the 77GHz millimeter wave radar test comprises the following steps:
water: 40 to 50 percent;
dispersing agent: 1.3 to 1.7 percent;
defoaming agent: 0.2 to 0.3 percent;
acetylene black: 1.5 to 2.5 percent;
graphene: 0.2-1%;
aluminum hydroxide: 8.5 to 9.5 percent;
ammonium polyphosphate: 3 to 4 percent;
elastic polyurethane feed liquid: 35.3 to 41 percent.
Further, the preparation method of the conductive feed liquid of the wave-absorbing material for the 77GHz millimeter wave radar test is characterized by comprising the following steps:
A. weighing: weighing the component materials according to the requirements;
B. stirring: sequentially adding a dispersing agent, a defoaming agent, acetylene black, graphene, aluminum hydroxide and ammonium polyphosphate into water, and stirring for 2 hours by using a high-speed dispersion machine under the condition of 2500 r/min;
C. grinding: grinding the feed liquid obtained in the step B for 2 hours by using a sand mill to obtain feed liquid with the particle size of less than 5 microns;
D. feeding: and D, adding the elastic polyurethane feed liquid into the feed liquid obtained in the step C, and stirring for 15 minutes at the speed of 300r/min to obtain an impregnation feed liquid.
Further, the roller press is a three-roller linkage structure, the feeding amount of the two parallel rollers is controlled through the roller distance, and the pressure of the two vertical rollers on the base material is controlled through the roller distance. The obtained product has uniform material liquid distribution, continuous conduction gradient and is more beneficial to high-frequency absorption.
Furthermore, the mastoid structure of the base material is relatively well buckled when the base material is rolled, and the front surface and the back surface of the base material are repeatedly rolled by a rolling machine. On the one hand, the production efficiency is improved, on the other hand, the product pressed by the roller is more uniform, the roller is repeatedly pressed by the reverse front surface of the roller press, and thus, the feed liquid uniformly permeates into the mastoid process structure little by little, so that the components are uniformly distributed in the mastoid process structure, and the influence of uneven distribution on high-frequency test is reduced.
Compared with the prior art, the invention has the following advantages:
1. according to the wave-absorbing material for the 77GHz millimeter wave radar test, the base material is designed into the mastoid structure in the shape of an eggshell, so that the front reflection can be reduced at high frequency, and the wave-absorbing material is more suitable for 77GHz high frequency;
2. according to the wave-absorbing material for the 77GHz millimeter wave radar test, provided by the invention, the mastoid structures of the pair of substrates are buckled in a mutual buckling manner during rolling, and are repeatedly pressed by the roller press, so that the obtained mastoid wave-absorbing material is more uniform in pressing of all components, and is more suitable for high-frequency test;
3. the wave-absorbing material for testing the 77GHz millimeter wave radar provides an accurate testing environment for the 77GHz millimeter wave radar which is smaller in size, higher in detection accuracy and longer in detection distance;
4. according to the wave-absorbing material for the 77GHz millimeter wave radar test, the absorption performance of the wave-absorbing material at high frequency of 77GHz is improved by adding the superconducting material graphene;
5. according to the wave-absorbing material for the 77GHz millimeter wave radar test, the feed liquid subjected to high-speed dispersion and sanding has the particle size smaller than 5 micrometers, the feed liquid is dispersed uniformly and finely, and after repeated stick pressing, all components are uniformly distributed in the mastoid structure, so that the requirement of high-frequency test can be met.
In conclusion, the technical scheme of the invention solves the problem that the existing wave-absorbing material in the prior art cannot meet the test requirement of 77GHz millimeter waves.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic view of the structure of the substrate of the present invention.
Fig. 2 is a graph of the normal incidence loss performance of a 75 mm high mastoid product of the present invention.
In the figure: 1. base plate 2, mastoid structure.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the absence of any contrary indication, these directional terms are not intended to indicate and imply that the device or element so referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be considered as limiting the scope of the present invention: the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.
Spatially relative terms, such as "above … …," "above … …," "above … … surface," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of the present invention should not be construed as being limited.
As shown in figure 1, the invention provides a wave-absorbing material for a 77GHz millimeter wave radar test, which is formed by immersing conductive liquid into a base material in a manner that the base material is rolled by a roll squeezer; the base material is made of polyurethane sponge with the aperture ratio of 90 percent, and comprises: a base plate 1 and a mastoid structure 2; the base plate 1 is a rectangular plate-shaped structure with the height of 20mm, and a plurality of mastoid structures 2 with the height of 55 are processed on one side of the base plate in an array manner; the row spacing and the column spacing of the vertexes of the mastoid structure 2 are both 35 mm.
The roll squeezer is three-roller linkage structure, goes up two parallel rollers and controls the feed volume at 1.5 millimeters through the roller interval control, and two vertical rollers are 5 millimeters control to the pressure of substrate through controlling the roller interval. When rolling, the mastoid structure is relatively well buckled, and the front and back surfaces of the roller press are repeatedly rolled.
The formula of the conductive feed liquid of the wave-absorbing material for the 77GHz millimeter wave radar test comprises the following components:
water: 45 percent;
dispersing agent: 1.5 percent;
defoaming agent: 0.2 percent;
acetylene black: 2 percent;
graphene: 0.8 percent;
aluminum hydroxide: 11 percent;
ammonium polyphosphate: 3 percent;
elastic polyurethane feed liquid: 36.5 percent.
The preparation method of the conductive feed liquid of the wave-absorbing material for the 77GHz millimeter wave radar test comprises the following steps:
A. weighing: weighing the component materials according to the requirements;
B. stirring: sequentially adding a dispersing agent, a defoaming agent, acetylene black, graphene, aluminum hydroxide and ammonium polyphosphate into water, and stirring for 2 hours by using a high-speed dispersion machine under the condition of 2500 r/min;
C. grinding: grinding the feed liquid obtained in the step B for 2 hours by using a sand mill to obtain feed liquid with the particle size of less than 5 microns;
D. feeding and grinding: and D, adding the elastic polyurethane feed liquid into the feed liquid obtained in the step C, and stirring for 15 minutes at the speed of 300r/min to obtain an impregnation feed liquid.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (1)
1. The wave-absorbing material for the 77GHz millimeter wave radar test is characterized in that the wave-absorbing material is formed by immersing conductive liquid into a base material in a manner that the base material is rolled by a roll squeezer;
the formula of the conductive liquid comprises:
water: 40-50%;
dispersing agent: 1.3 to 1.7 percent;
defoaming agent: 0.2 to 0.3 percent;
acetylene black: 1.5 to 2.5 percent;
graphene: 0.2-1%;
aluminum hydroxide: 8.5 to 9.5 percent;
ammonium polyphosphate: 3 to 4 percent;
elastic polyurethane feed liquid: 35.3 to 41 percent;
the preparation method of the conductive feed liquid is characterized by comprising the following steps:
A. weighing: weighing the component materials according to the requirements;
B. stirring: sequentially adding a dispersing agent, a defoaming agent, acetylene black, graphene, aluminum hydroxide and ammonium polyphosphate into water, and stirring for 2 hours by using a high-speed dispersion machine under the condition of 2500 r/min;
C. grinding: grinding the feed liquid obtained in the step B for 2 hours by using a sand mill to obtain feed liquid with the particle size of less than 5 microns;
D. feeding: adding the elastic polyurethane feed liquid into the feed liquid obtained in the step C, and stirring for 15 minutes at the speed of 300r/min to obtain an impregnation feed liquid;
the substrate is made of open-cell polyurethane sponge and comprises: a substrate (1) and a mastoid structure (2); the base plate (1) is of a rectangular plate-shaped structure, and a plurality of mastoid structures (2) are processed on one side of the base plate in an array manner;
the aperture ratio of the base material is 90%; the height of the substrate (1) is 15-25 mm; the height of the mastoid structure (2) is 55-65 mm; the line spacing and the row spacing of the vertex of the mastoid structure (2) are both 35 mm;
the mastoid structure (2) is relatively well buckled when the base material is rolled, and the front surface and the back surface of the base material are repeatedly rolled by a rolling machine.
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| CN201910780414.3A CN110483835B (en) | 2019-08-22 | 2019-08-22 | Wave-absorbing material for 77GHz millimeter wave radar test |
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| CN110483835B true CN110483835B (en) | 2022-06-21 |
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| CN117050378B (en) * | 2023-10-13 | 2024-02-13 | 中汽研汽车检验中心（天津）有限公司 | Millimeter wave absorbing material for ADAS (advanced automatic analysis system) test and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6784419B1 (en) * | 1999-10-28 | 2004-08-31 | Kabushiki Kaisha Riken | Electromagnetic wave absorber |
| CN103347379A (en) * | 2013-07-10 | 2013-10-09 | 南京洛普电子工程研究所 | Fire-retardant type wide-frequency-band high-power compound wave-absorbing material and preparing method thereof |
| CN209226893U (en) * | 2018-12-18 | 2019-08-09 | 大连东信微波技术有限公司 | Structural foam, which is soaked, with continuous conduction gradient half inhales wave plate |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6784419B1 (en) * | 1999-10-28 | 2004-08-31 | Kabushiki Kaisha Riken | Electromagnetic wave absorber |
| CN103347379A (en) * | 2013-07-10 | 2013-10-09 | 南京洛普电子工程研究所 | Fire-retardant type wide-frequency-band high-power compound wave-absorbing material and preparing method thereof |
| CN209226893U (en) * | 2018-12-18 | 2019-08-09 | 大连东信微波技术有限公司 | Structural foam, which is soaked, with continuous conduction gradient half inhales wave plate |
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