JP2003013453A - Electromagnetic-wave absorbing bedrock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electromagnetic-wave absorbing bedrock capable of imparting an electromagnetic-wave antireflection function to the inclined face of a slope and a vertical wall surface. SOLUTION: In an electromagnetic-wave absorbing heat-generating bedrock 10, a cubic net 12 is constituted reticulately in fixed wall thickness, and granular electromagnetic-wave absorbing heating elements are inserted from a rear while the passage of the heating elements from a surface is obstructed. The heating elements can be fixed onto the face of the slope and the wall surface, preventing a falling-off by installing bedrock 10 (the cubic net 12) onto the face of the slope and the wall surface under the state in which the rear side of the bedrock 10 is directed towards the face of the slope and the wall surface side. Accordingly, the heating elements absorb arrival electromagnetic waves, and the face of the slope and the wall surface can be given the electromagnetic-wave antireflection function. Since heat is generated when the heating elements absorb electromagnetic waves, the roots of moss arranged on the rear side of the net 12 are heated, and the rearing of moss can be promoted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave absorbing base that accommodates an electromagnetic wave absorber.

[0002]

2. Description of the Related Art On toll roads, sophistication of information is being promoted by so-called intelligent transportation system (ITS), such as automatic toll collection system (ETC) for toll roads and driving support system (AHS) for vehicles traveling on the road. However, in such a system, electromagnetic waves are intensely communicated.

Generally, there are many inclined slopes and vertical wall surfaces on toll roads, and electromagnetic waves reflected (diffuse reflection) on the slopes and wall surfaces adversely affect the above-mentioned system and cause malfunctions. It is an environment. In particular, it is not preferable that the system malfunctions in a vehicle moving at high speed. Therefore, it is desired to prevent the slopes and wall surfaces from reflecting electromagnetic waves.

Further, it is also desired that these slopes and wall surfaces can be greened, and in particular, a retaining wall made of concrete is often provided near the toll road,
It is preferable that this retaining wall can be greened to form a good landscape.

There is also a demand for immediate countermeasures against electromagnetic interference caused by the reflection of electromagnetic waves from the walls and roofs of buildings (especially high-rise buildings) and civil engineering structures. Various wall materials and roof materials that can prevent the reflection of electromagnetic waves have been developed. However, these wall materials and roof materials cannot be greened.

[0006]

SUMMARY OF THE INVENTION In consideration of the above facts, an object of the present invention is to obtain an electromagnetic wave absorbing substrate which can impart an electromagnetic wave reflection preventing function to an inclined slope or a vertical wall surface.

[0007]

The electromagnetic wave absorbing substrate according to claim 1 is formed into a granular form, and an electromagnetic wave absorbing body containing an electromagnetic wave absorbing material that absorbs an electromagnetic wave and a net having a predetermined wall thickness are provided. The three-dimensional net has a back surface having a larger mesh than the mesh so that the electromagnetic wave absorber is inserted from the back surface and blocks passage of the electromagnetic wave absorber from the front surface.

In the electromagnetic wave absorbing substrate according to the first aspect, the three-dimensional net is formed in a net having a predetermined thickness, the granular electromagnetic wave absorbing body is inserted from the back side, and the passage of the electromagnetic wave absorbing body from the front side is blocked. ing.

Here, for example, by installing a three-dimensional net on an inclined slope or a vertical wall with the back side thereof facing the slope or wall, the electromagnetic wave absorber is formed on the slope or wall by the three-dimensional net. It can be fixed while preventing falling off.

Therefore, when an electromagnetic wave arrives at the slope or wall surface, the electromagnetic wave absorbing material in the electromagnetic wave absorber absorbs the electromagnetic wave, whereby the slope or wall surface can be provided with an electromagnetic wave reflection preventing function. .

An electromagnetic wave absorbing board according to a second aspect is the electromagnetic wave absorbing board according to the first aspect, further comprising a coating material for covering the back surface of the three-dimensional net.

In the electromagnetic wave absorbing board according to claim 2, since the coating material covers the back surface of the three-dimensional net, the three-dimensional net of the three-dimensional net is transported when the electromagnetic wave absorbing board is transported or installed on a slope or a wall surface. It is possible to prevent the electromagnetic wave absorber from falling off from the back surface side.

The electromagnetic wave absorption substrate according to claim 3 is the electromagnetic wave absorption substrate according to claim 1 or 2.
The electromagnetic wave absorbing material is characterized in that it generates heat when absorbing electromagnetic waves and includes a plant whose root is the back side of the three-dimensional net.

In the electromagnetic wave absorbing substrate according to the third aspect, the electromagnetic wave absorbing material in the electromagnetic wave absorbing body generates heat when absorbing the electromagnetic wave, so that the root of the plant is heated, thereby promoting the growth of the plant. .

Further, since the root of the plant is the back side of the three-dimensional net, the plant extends to the front side of the three-dimensional net. As a result, it is possible to prevent the plant from coming off from the three-dimensional net due to wind, rain, or the like by locking the plant on the three-dimensional net.

An electromagnetic wave absorbing substrate according to a fourth aspect is the electromagnetic wave absorbing substrate according to the third aspect, characterized in that a water retaining material having water absorbing and water retaining properties is arranged at the root of the plant.

In the electromagnetic wave absorbing substrate according to claim 4, since the water retaining material having water absorbing and water retaining properties is arranged at the root of the plant, it is possible to stably supply water to the plant. Can be further promoted.

An electromagnetic wave absorbing board according to claim 5 is the electromagnetic wave absorbing board according to any one of claims 1 to 4, wherein a reflecting material for reflecting electromagnetic waves is provided on the back surface side of the three-dimensional net. It is characterized by that.

In the electromagnetic wave absorbing substrate according to the fifth aspect, since the reflecting material on the back surface side of the three-dimensional net reflects the electromagnetic wave, the electromagnetic wave that arrives at the three-dimensional net reciprocates in the three-dimensional net. Thereby, the electromagnetic wave absorption efficiency of the electromagnetic wave absorption base can be improved, and the electromagnetic wave absorption efficiency can be maintained while making the electromagnetic wave absorption base thin.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of an electromagnetic wave absorbing and heat generating base 10 as an electromagnetic wave absorbing base according to an embodiment of the present invention as seen from the surface side.

Electromagnetic wave absorption and heat generation substrate 1 according to the present embodiment
0 has a three-dimensional net 12. Three-dimensional net 12
Is made of a chemical fiber such as polypropylene or nylon or a natural fiber such as wool and is formed into a net having a predetermined thickness, and the back surface has a larger mesh than the surface mesh. In the present embodiment, the three-dimensional net 12 has a wall thickness of 10
mm to 20 mm, and the surface texture is horizontal 3
The length is 6 mm and the mesh on the back side is 15 mm.
The vertical length is 20 mm.

As shown in FIG. 2, in the three-dimensional net 12,
An electromagnetic wave absorption heating element 14 as an electromagnetic wave absorber, which will be described in detail later, is housed. The electromagnetic wave absorbing heating element 14 is
The mesh size is made larger than the mesh size on the front surface of the three-dimensional net 12 and smaller than the mesh size on the back surface of the three-dimensional net 12, so that the electromagnetic wave absorbing heating element 14 is inserted into the three-dimensional net 12 from the rear surface and the electromagnetic wave is absorbed. The absorption heating element 14 is prevented from passing the surface of the three-dimensional net 12. In addition, it is preferable that a plurality of electromagnetic wave absorption heating elements 14 be accommodated in each mesh (mesh) on the back surface of the three-dimensional net 12.

The back surface of the three-dimensional net 12 is covered with a non-woven fabric 16 as a covering material which also functions as a water retaining material.
The non-woven fabric 16 is made of chemical fibers or natural fibers, and has water absorption and high water retention. In the present embodiment, the thickness of the nonwoven fabric 16 is about 3 mm to 30 mm.

The non-woven fabric 16 is sewn with fruit bodies and spore bodies of moss 18 (eg, moss) as plants shown in FIG. 3 together with a polymer (not shown) as a water retaining material. Therefore, when the moss 18 is grown, the moss 18 has the root of the nonwoven fabric 16 (the back surface side of the three-dimensional net 12). Further, the polymer has high water absorption and water retention, and in the present embodiment, for example, is a cross-linked product of NVA (N-vinylacetamide), is nonionic, and has a stable water supply ratio in a wide pH range. (For example, trade name NA-010 of Showa Denko KK).

Further, FIG. 4 shows the electromagnetic wave absorption heating element 14 in a perspective view, and FIG. 5 shows the electromagnetic wave absorption heating element 14 in a sectional view.

The electromagnetic wave absorbing heat generating body 14 is formed into a substantially oval shape, and a columnar (or rectangular parallelepiped shape) core material 20 is disposed inside the electromagnetic wave absorbing heat generating body 14.
In the present embodiment, the core material 20 is, for example, an artificial lightweight aggregate,
It is made of crushed stone or porous material made from coal ash or glass powder, and the maximum diameter of the core material 20 is about 2 m.
The maximum length is 5 mm in m, or the maximum diameter is 5 mm and the maximum length is 10 mm.

The core material 20 is coated with the coating solid 22, which constitutes the electromagnetic wave absorbing heat generating body 14. As shown in detail in FIG. 6, the coated solid 22 is the electromagnetic wave absorbing heat generating material 2 as an electromagnetic wave absorbing material in the mixed solid 24.
6 is dispersed and mixed.

The mixed solid 24 is produced by solidifying a liquid mixed solution (such as heat treatment (including baking treatment) or solvent vaporization treatment) and has heat resistance. There is. Therefore, as described later, the electromagnetic wave absorption heating element 1
Even when 4 (electromagnetic wave absorption heat generating material 26) generates heat, it is possible to prevent deterioration of the electromagnetic wave absorption heat generating body 14 (mixed solid 24). Here, the core material 20 is coated with the coating solution in which the electromagnetic wave absorbing heat generating material 26 is dispersed and mixed in the mixed solution to form a granular intermediate granular body, and then the mixed solution of the intermediate granular body is subjected to a solidification treatment. Then, the mixed solution is changed to the mixed solid 24 (the coating solution is changed to the coated solid 22), and the electromagnetic wave absorption heating element 14 is manufactured.

In the present embodiment, as the mixed solution, for example, a solution of polyimide resin, polyamideimide resin, polyethersulfone resin, polyesterimide resin, polyetherimide resin, polyimidazopyrrolone resin, bismaleimide resin, or the like, or Precursor solutions of these resins have been used.

The electromagnetic wave absorbing heat generating material 26 has a property of generating heat when absorbing an electromagnetic wave. Electromagnetic wave absorbing heat generating material 26
Has a high electrical conductivity, which makes it possible to improve the electromagnetic wave absorbing and heating performance of the electromagnetic wave absorbing and heating element 14. Further, it is more preferable that the electromagnetic wave absorbing heat generating material 26 is subjected to an oxidation treatment, so that the higher the degree of oxidation of the electromagnetic wave absorbing heat generating material 26 is, the higher the degree of oxidation of the electromagnetic wave absorbing heat generating material 26 is, in particular, the mixed solution such as the polyimide resin precursor solution. When it has a property of improving the above, the electromagnetic wave absorbing heat generating material 26 can be well dispersed in the mixed solution.

In this embodiment, the electromagnetic wave absorbing heat generating material 2 is used.
6 is not particularly limited, for example, carbon fiber,
It is a conductive fiber such as carbon-containing fiber, needle carbon, ferrite, metal fiber, etc., and the length of the electromagnetic wave absorbing heat generating material 26 is about 0.01 mm to 20 mm (for example, 5 mm) corresponding to the core material 20, and The thickness of the electromagnetic wave absorbing heat generating material 26 is about 5 μm.
Further, the electromagnetic wave absorbing heat generating material 26 is mixed in the mixed solution such that the weight ratio to the mixed solid 24 is about 0.01% to 1.0% (for example, 0.01%).

When the electromagnetic wave absorbing heat generating material 26 is dispersed in the mixed solution, the electromagnetic wave absorbing heat generating material 26 may be damaged (including breakage) by stirring the mixed solution with a conditioning mixer such as an eccentric rotor. While being prevented, the electromagnetic wave absorbing exothermic material 26 is sufficiently (uniformly) dispersed in the mixed solution. Even if a conditioning mixer such as an eccentric rotor is not used, another stirrer or the like may be used as long as it can sufficiently disperse the electromagnetic wave absorbing heat generating material 26 in the mixed solution so as not to damage (break) the mixed solution. Good.

When the electromagnetic wave absorbing heat generating material 26 is dispersed and mixed in the mixed solution, the mixed solution is adjusted to a temperature having a low viscosity. For example, when the mixed solution is a polyimide resin precursor solution, the temperature is preferably adjusted to 30 ° C. to 90 ° C., and more preferably 30 ° C. to 60 ° C. This makes it possible to disperse the electromagnetic wave absorption heat generating material 26 in the mixed solution better.

When the core material 20 is coated with the coating solution, the surface of the core material 20 is coated with a coating solution having a thickness of, for example, 20 μm to 30 μm.
A large amount of the core material 20 is put in the paste of the coating solution in an amount calculated from the surface area of the core material 20 so as to be coated with m, and the mixture is sufficiently stirred. As a result, each core material 20 is coated with the coating solution to produce a large amount of intermediate particles at one time,
A large amount of intermediate particles can be efficiently produced. Moreover, the coating solution can be uniformly coated on the entire surface of the core material 20 without leaking, and the electromagnetic wave absorbing heat generating material 26 for the mixed solution can be provided.
Electromagnetic wave absorption heat generating material 2
6 can be dispersed even better.

Before solidifying the mixed solution of the intermediate particles, for example, immediately after coating the core material 20 with the coating solution, the intermediate particles are gradually immersed in the liquid tank containing the film-forming solvent while stirring. By doing so, the film forming solvent is attached to the intermediate particles (solution to be mixed) while a physical force is applied to the intermediate particles. This film-forming solvent is a solvent having a low solubility in the solute of the mixed solution and a high solubility in the solvent of the mixed solution, whereby the solute of the mixed solution is deposited on the surface of the intermediate granular material to form a film. It is formed.
Therefore, it is possible to prevent the intermediate particles (mixed solution) from sticking to each other even when solidifying a large amount of the mixed solution of the intermediate particles at one time.

When the mixed solution is a polyimide resin precursor solution, the film forming solvent is not particularly limited, and examples thereof include alcohols such as ethanol, methanol and isopropyl alcohol, hexane, ethylene chloride, 1-
It is a low boiling point organic solvent such as butanol, and these may be used in combination. Further, in this case, by attaching a film-forming solvent to the polyimide resin precursor solution, the polyamic acid that is the polyimide resin precursor is deposited on the surface of the intermediate granular body to form a polyamic acid film.

When the solution to be mixed is a polyimide resin precursor solution and the polyimide resin precursor solution of the intermediate particles is solidified, for example, the intermediate particles taken out from the liquid tank containing the film-forming solvent may be used. 80 to 120 ℃ body
The polyamic acid film on the surface of the intermediate particles is dried by heating to about 300 ° C., and then the heating temperature of the intermediate particles is increased to 300 ° C.
Gradually raise the temperature up to about ℃ (eg
After heating the polyamic acid film by heating at 20 ° C. for 60 minutes, the intermediate granules are heated at 200 ° C. for 10 minutes and then at 250 ° C. for 60 minutes.
By heating in this order for 30 minutes at 300 ° C.), the polyimide resin precursor is imidized (made into a polyimide resin) and solidified.

Next, the operation of this embodiment will be described.

In the electromagnetic wave absorption / heating base 10 having the above-described structure, the three-dimensional net 12 is formed in a net shape having a predetermined thickness, and the granular electromagnetic wave absorption / heating element 14 is inserted from the back surface and the electromagnetic wave absorption / heating element 14 from the front surface is inserted. Is blocked from passing.

Here, by installing the electromagnetic wave absorption and heat generation base 10 (three-dimensional net 12) on the sloped slope or vertical wall surface with a pile or the like with the back side thereof facing the slope or wall surface side, Electromagnetic wave absorption heating element 14 on the wall or wall
By 2 it can be fixed while preventing falling off.

Therefore, when an electromagnetic wave arrives on the slope or wall surface, the electromagnetic wave absorbing heat generating material 26 in the electromagnetic wave absorbing heat generating body 14 absorbs the electromagnetic wave, thereby providing an electromagnetic wave reflection preventing function on the slope or wall surface. Can be granted.

Further, since the back surface of the three-dimensional net 12 is covered with the nonwoven fabric 16, the electromagnetic wave absorption and heat generation from the back side of the three-dimensional net 12 during transportation of the electromagnetic wave absorption and heat generation substrate 10 or installation on a slope or a wall surface. It is possible to prevent the body 14 and the moss 18 (plant seedlings, etc.) from falling off.

Further, when the electromagnetic wave absorbing heat generating material 26 in the electromagnetic wave absorbing heat generating body 14 absorbs the electromagnetic wave, heat is generated, so that the root of the moss 18 is heated, and thus the moss 18 can be promoted to grow. .

Further, since the moss 18 has the back side of the three-dimensional net 12 as a root, the moss 18 extends to the front side of the three-dimensional net 12. As a result, the moss 18 is locked to the three-dimensional net 12, so that the moss 18 can be prevented from falling off the three-dimensional net 12 due to wind, rain, or the like.

On the back side of the three-dimensional net 12, the non-woven fabric 1 is formed.
Since 6 is arranged, the moss 18 takes root in the nonwoven fabric 16. As a result, the moss 18 is locked to the non-woven fabric 16, so that the moss 18 is blown by the wind, rain, etc.
It can be further prevented from peeling from 2.

Furthermore, since the water-absorbing and water-retaining polymer and the non-woven fabric 16 are arranged at the base of the moss 18, the moss 18 can be stably supplied with water. Can be further promoted.

Therefore, by installing the electromagnetic wave absorption and heat generation base 10 on an inclined slope of a toll road (for example, a retaining wall made of concrete having a slope of 3 minutes to 5 minutes) or a vertical wall surface, the intelligent transportation system (ITS) can be installed. The automatic toll collection system (ETC) on toll roads and the driving support system (AHS) for cars traveling on the road can be effectively prevented from malfunctioning, and at the same time, the slopes and walls are greened and good. You can create a beautiful landscape (add high added value to slopes and walls).

Further, by installing the electromagnetic wave absorbing and heat-generating base 10 on the wall surface (including sound insulating wall) or roof of a building (especially a high-rise building) or a civil engineering structure, the reflection of the electromagnetic wave by this wall surface or the roof can be efficiently performed. At the same time, the walls and roof can be greened to save energy.

Furthermore, even on existing slopes with seedlings and trees, it is possible to install the electromagnetic wave absorbing heat generating base 10 by cutting out the electromagnetic wave absorbing heat generating base 10 (electromagnetic wave absorbing base) at the portion where the seedlings and trees are present. .

Further, even when the slope (including the roof and the retaining wall) and the wall surface are curved surfaces, the electromagnetic wave absorbing and heat generating base 10 (electromagnetic wave absorbing base) is curved corresponding to the curved surface,
The electromagnetic wave absorption heat generation base 10 can be installed.

(Modification) FIG. 7 shows a partially broken perspective view of an electromagnetic wave absorbing and heating base 30 according to a modification of the present embodiment.

In the electromagnetic wave absorbing and heat generating base 30 according to the present modification, the back surface of the three-dimensional net 12 (the three-dimensional net 12 and the nonwoven fabric 1).
6) and the reflection material 32 is fixed to the reflection material 32.
Reflects the electromagnetic waves that have arrived at the three-dimensional net 12. The reflecting material 32 is, for example, a wire mesh, a punching metal, a mesh foil, a metal plate, or the like.

Here, in the electromagnetic wave absorption / heating base 30 according to the present modification, the reflecting material 32 on the rear surface side of the three-dimensional net 12 reflects the electromagnetic wave, so that the electromagnetic wave arriving at the three-dimensional net 12 reciprocates in the three-dimensional net 12. Thereby, the electromagnetic wave absorption and heat generation base 30 can be improved in electromagnetic wave absorption efficiency and heat generation efficiency, and the electromagnetic wave absorption and heat generation base 30 (three-dimensional net 12) can be improved.
It is possible to maintain electromagnetic wave absorption efficiency and heat generation efficiency while reducing the thickness.

[0054]

According to the electromagnetic wave absorption substrate of claim 1,
For example, the electromagnetic wave absorber can be fixed to an inclined slope or a vertical wall surface by a three-dimensional net while preventing the electromagnetic wave absorber from falling off, so that the slope or wall surface can be provided with an electromagnetic wave reflection preventing function.

In the electromagnetic wave absorbing substrate according to the second aspect, since the coating material covers the back surface of the three-dimensional net, it is possible to prevent the electromagnetic wave absorber from falling off from the back surface side of the three-dimensional net.

In the electromagnetic wave absorbing substrate according to the third aspect, since the electromagnetic wave absorbing material in the electromagnetic wave absorbing body generates heat when absorbing the electromagnetic wave, it is possible to promote the growth of plants. Furthermore, since the plant has the root on the back side of the three-dimensional net, it is possible to prevent the plant from being locked by the three-dimensional net and falling off from the three-dimensional net.

In the electromagnetic wave absorbing base according to the fourth aspect, since the water retaining material is arranged at the root of the plant, it is possible to stably supply water to the plant and further promote the growth of the plant.

In the electromagnetic wave absorbing substrate according to claim 5, since the reflecting material on the back side of the three-dimensional net reflects electromagnetic waves, the electromagnetic wave absorbing efficiency of the electromagnetic wave absorbing substrate can be improved, and the electromagnetic wave absorbing substrate can be made thin while absorbing the electromagnetic wave. Efficiency can be maintained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an electromagnetic wave absorption and heat generation substrate according to an embodiment of the present invention as seen from the surface side.

FIG. 2 is a perspective view showing a three-dimensional net and an electromagnetic wave absorbing heating element as viewed from the back side.

FIG. 3 is a perspective view showing the electromagnetic wave absorption and heat generation base in a state where the plant is elongated, as seen from the surface side.

FIG. 4 is a perspective view showing an electromagnetic wave absorbing heating element.

FIG. 5 is a sectional view showing an electromagnetic wave absorbing heating element.

FIG. 6 is a cross-sectional view showing a coated solid of an electromagnetic wave absorption heating element.

FIG. 7 is a perspective view showing an electromagnetic wave absorbing and heating substrate according to a modified example of the embodiment of the present invention, as seen from the front surface side.

[Explanation of symbols]

10 Electromagnetic wave absorption heat generation base (electromagnetic wave absorption base) 12 three-dimensional net 14 Electromagnetic wave absorption heating element (electromagnetic wave absorber) 16 Non-woven fabric (covering material, water retaining material) 18 Mosses (plants) 26 Electromagnetic wave absorbing heat generating material (electromagnetic wave absorbing material) 30 Electromagnetic wave absorption heat generation base (electromagnetic wave absorption base) 32 reflective material

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Mamoru Sakuma             Chiba Prefecture Inzai City 1-5 Otsuka 1 Stock Association             Takenaka Corporation Technical Research Institute (72) Inventor Kenichi Harakawa             Chiba Prefecture Inzai City 1-5 Otsuka 1 Stock Association             Takenaka Corporation Technical Research Institute (72) Inventor Yoshifumi Fujii             8-21 Ginza Stock Exchange, Chuo-ku, Tokyo             Takenaka engineering works (72) Inventor Takeshi Kunishima             8-21 Ginza Stock Exchange, Chuo-ku, Tokyo             Takenaka Road F-term (reference) 2D044 DA12                 4F100 AT00C AT00D BA03 BA04                       BA05 BA07 BA10B BA10D                       DC11B DE01A DG15D GB07                       GB90 JD08A JD15A JJ06A                       JN06C                 5E321 BB31 BB41 BB51 GG11 GH03                 5J020 BD02 EA04 EA10

Claims (5)

[Claims] 1. An electromagnetic wave absorber that is granular and contains an electromagnetic wave absorbing material that absorbs an electromagnetic wave, and a net having a predetermined thickness, and the mesh of the back surface is larger than that of the front surface from the back surface. An electromagnetic wave absorption base comprising: a three-dimensional net into which the electromagnetic wave absorber is inserted and which blocks passage of the electromagnetic wave absorber from the surface. 2. The electromagnetic wave absorbing substrate according to claim 1, further comprising a coating material that covers a back surface of the three-dimensional net. 3. The electromagnetic wave absorbing material generates heat when absorbing an electromagnetic wave, and further comprises a plant whose root is on the back side of the three-dimensional net.
The electromagnetic wave absorption base described. 4. The electromagnetic wave absorbing substrate according to claim 3, wherein a water retaining material having water absorbing ability and water retaining ability is arranged at the root of the plant. 5. The electromagnetic wave absorbing substrate according to claim 1, wherein a reflecting material that reflects electromagnetic waves is provided on the back surface side of the three-dimensional net.