Connection structure of radio wave control body, radio wave control body, radio wave anechoic box, cutting jig, and method for making radio wave control body

Abstract

To provide a connection structure for a radio wave control body that reliably blocks radio waves.SOLUTION: The present invention is a connection structure for a radio wave control body 11 that connects different ends 11a to 11d of the radio wave control body 11 that blocks radio waves, or connects ends of the radio wave control body 11 and another radio wave control body 11. Edges 11e of the ends 11a to 11d are undulating and corrugated when viewed from a direction perpendicular to the direction X in which the ends of the radio wave control body or another radio wave control body extend and the direction Y in which they butt against each other, and the edges of the connected ends are corrugated such that they fit together.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a connection structure for a radio wave control unit, a radio wave control unit, a radio wave anechoic box in which a radio wave control unit is used and which has an internal space that is radio wave shielded from the outside, a cutting jig for producing a radio wave control unit, and a method for producing a radio wave control unit. [Background technology]

[0002] A wireless terminal such as a mobile phone is equipped with a wireless communication antenna, and when a performance test is carried out to measure and evaluate the output level and reception sensitivity of the transmitted radio wave of this antenna, a radio wave anechoic box is used to minimize the influence of external radio waves. A radio wave anechoic box is also called a radio wave anechoic chamber, a shielded box, or a shielded chamber. For example, the radio wave anechoic box described in Patent Document 1 is equipped with a housing having a radio wave absorber on the inner wall to suppress the reflection of radio waves. The front part of the housing is a door made of a radio wave absorber. The door is attached to the housing body, which is the part of the housing excluding the door, by a hinge so as to be rotatable. The housing body is composed of a metal plate and a radio wave absorber attached to the inner wall of the metal plate.

[0003] In the invention described in Patent Document 1, a door is attached to the housing body, and a gap is generated between the housing body and the door. The housing body is a rectangular parallelepiped with an opening at the front, and the door is a rectangular parallelepiped that closes the opening of the housing body when viewed from the front. The gap generated between the housing body and the door extends linearly along the vertical and horizontal directions of the housing body and the door when viewed from the side, flat surface, and bottom. Since the radio waves blocked by the radio wave anechoic box are transverse waves, the radio waves are likely to enter the inside of the housing body through this linear gap or leak out from the housing body to the outside. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2001-119194 A Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention has been made with attention to the above-mentioned problems, and aims to provide a connecting structure for radio wave control bodies, a radio wave control body, a radio wave anechoic box, a cutting jig, and a method for making a radio wave control body, which prevent radio waves from passing through gaps that occur between connected radio wave control bodies and reliably block radio waves. [Means for solving the problem]

[0006] In order to achieve the above object, the present invention includes the subject matter described in the following paragraphs.

[0007] Item 1: A connection structure of a radio wave control body that connects different ends of a radio wave control body that blocks radio waves, or connects ends of the radio wave control body and another radio wave control body, A connection structure of a radio wave control body, in which the edges of the end portions are undulating and corrugated when viewed from a direction perpendicular to the direction in which the end portions of the radio wave control body or other radio wave control bodies extend and the direction in which they butt against each other, and the edges of the connected end portions are wavy and fit together.

[0008] Item 2: A radio wave control device that blocks radio waves, The edge of the end of the radio wave control body has an undulating corrugated shape when viewed from a direction perpendicular to the direction in which the end portions extend and the direction in which they butt against each other.

[0009] Item 3: A radio wave control body according to item 2, wherein an end of the radio wave control body is connected to another end of the same radio wave control body or to an end of another radio wave control body.

[0010] Item 4: A radio wave control device according to item 2 or 3, wherein the waveform is composed of straight lines.

[0011] Item 5: The waveform is any one of a triangular wave, a rectangular wave, and a polygonal wave; 5. The radio wave control body according to item 4, wherein the length of the straight lines constituting the waveform is shorter than half the wavelength of the radio wave blocked by the wall.

[0012] Item 6: A radio wave control device according to item 2 or 3, wherein the waveform is composed of a curved line.

[0013] Item 7: When the waveform is a waveform in which a semicircle and an inverted semicircle are alternately and continuously arranged, the diameter of the semicircle is shorter than half the wavelength of the radio wave blocked by the wall, 7. The radio wave control body according to item 6, wherein when the waveform is a waveform in which semi-ellipse and inverted semi-ellipse are alternately and continuously arranged, the major axis of the semi-ellipse is shorter than half the wavelength of the radio wave blocked by the wall.

[0014] Item 8: A conductive layer including a conductor, a base layer for holding the conductive layer, a protective layer for holding the conductive layer, and an adhesive layer for bonding the conductive layer and the protective layer, the base layer, the conductive layer, the adhesive layer, and the protective layer being laminated in this order; The radio wave control device according to any one of items 2 to 7, wherein the conductive layer has regions without conductors surrounded by one or more linear conductors, which are periodically arranged at a predetermined interval.

[0015] Item 9: A radio wave anechoic box constructed of walls that block radio waves, having an internal space that is radio wave shielded from the outside, and comprising a radio wave control body described in any one of items 2 to 8 on at least a part of the walls.

[0016] Item 10: A cutting jig for cutting a sheet-like radio wave control body base material made of a material that blocks radio waves to produce a radio wave control body according to any one of items 2 to 7.

[0017] Item 11: A method for producing a radio wave control body, comprising a step of cutting a sheet-like radio wave control body base material made of a material that blocks radio waves to cut out the radio wave control body described in any one of items 2 to 7. Effect of the Invention

[0018] According to the present invention, radio waves can be prevented from passing through gaps that occur between connected radio wave control bodies, and radio waves can be reliably blocked. [Brief description of the drawings]

[0019] [Figure 1] 1 is a perspective view showing a schematic overall configuration of an electromagnetic wave anechoic box according to an embodiment of the present invention; [Diagram 2] FIG. [Diagram 3] FIG. 2 is a cross-sectional view of an anechoic box. [Figure 4] FIG. 13 is a perspective view showing the overall configuration of a modified example of the electromagnetic wave anechoic box. [Diagram 5] FIG. 5 is a cross-sectional view of the anechoic box shown in FIG. [Figure 6] FIG. 13 is a perspective view showing the overall configuration of a modified example of the electromagnetic wave anechoic box. [Figure 7] FIG. 4 is a plan view showing the connection structure of the radio wave control body. [Figure 8] FIG. 11 is a perspective view showing another example of the connection structure of the radio wave control body. [Figure 9] FIG. 1 is an explanatory diagram showing examples of waveforms, where (A) is a semicircular wave, (B) is a semi-elliptical wave, (C) is an arc wave, and (D) is a sine wave. [Figure 10] FIG. 1 is an explanatory diagram showing examples of waveforms, where (A) is a regular triangle wave, (B) is a sawtooth wave, (C) is a square wave, (D) is a trapezoidal wave, and (E) is an inverted trapezoidal wave. [Figure 11] FIG. 11 is a perspective view of a cutting jig used when producing a radio wave control body. [Figure 12] FIG. 11 is a perspective view showing another example of the cutting jig. [Figure 13] FIG. 11 is a perspective view showing another example of the cutting jig. [Figure 14] FIG. 11 is a perspective view showing another example of the cutting jig. [Figure 15] 16(B) is a cross-sectional view showing a schematic configuration of a radio wave control unit, taken along line BB in FIG. 16(B). [Figure 16] 12A and 12B show a schematic configuration of the entire radio wave control unit shown in FIG. 11, in which (A) is a plan view and (B) is an enlarged view of part A in (A). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] (Radio wave anechoic box 20 using radio wave control body 11) (Overall configuration of the radio wave anechoic box 20) 1 to 3 show a radio wave anechoic box 20 of the present invention. The radio wave anechoic box 20 is used to perform a performance evaluation of a measurement object D of a wireless device placed in an internal space S while minimizing the influence of external radio waves. The measurement object D is, for example, an antenna of a wireless terminal such as a mobile phone, and the output level and reception sensitivity of the transmitted radio waves are measured as the performance evaluation. The radio wave anechoic box 20 includes both an internal space S in which a person can work, and an internal space S that is small and can accommodate the measurement object D and a measurement device, etc., but in which a person cannot work. The radio wave anechoic box 20 is also called a radio wave anechoic chamber, a shielded box, a shielded chamber, etc.

[0021] 1 is the up-down direction of the anechoic box 20. Note that the up-down direction of the anechoic box 20 during use does not have to be along the vertical direction and may be in any direction.

[0022] The radio wave anechoic box 20 of the present invention includes a box body 30 having an opening 31 that defines an internal space S that is radio wave shielded from the outside, and a lid member 40 that closes the opening 31 of the box body 30, and has an overall cylindrical shape. The box body 30 is composed of a bottom wall 32 and a peripheral wall 33, and the lid member 40 is composed of an upper wall 42 and a peripheral wall 43. In one example, the size of the radio wave anechoic box 20 is set to a length in the vertical direction in FIG. 1 of 20 cm or more and 70 cm or less, and the diameter of the circle in a plan view is set to 20 cm, but is not limited thereto, and the radio wave anechoic box 20 can be of any size.

[0023] Here, radio wave blocking or blocking refers to the fact that radio waves do not leak from the internal space S of the radio wave anechoic box 20 to the outside, and that radio waves do not enter the internal space S of the radio wave anechoic box 20 from the outside.

[0024] (Configuration of box body 30) The box body 30 is of a generally cylindrical shape with an opening 31 at the top end, and includes a base 34, and a radio wave control body 11 and a second radio wave control body 21 attached to the base 34. The base 34 has a bottom 35 that is circular in plan view, and a peripheral side part 36 that is erected at a position radially inward from the peripheral edge of the bottom 35. The peripheral side part 36 is erected in a ring shape parallel to the peripheral edge of the bottom 35 in plan view, and has the same center point as the bottom 35. The base 34 is made of synthetic resin, and is integrally formed by injection molding. The synthetic resin is not limited, but may be the same as the base layer 13 and protective layer 15 that constitute the radio wave control body 11 described later.

[0025] The base 34 is transparent and can transmit visible light. When an object is "transparent," it means that an object on one side of the object can be seen from the other side, and the total light transmittance does not have to be 100%. "Transparent" includes translucency and colored objects. The total light transmittance of the base 34 under the D65 standard light source is set to 65% or more, more preferably 80% or more, and even more preferably 90% or more.

[0026] "Total light transmittance" refers to the transmittance of light from a D65 standard light source. Total light transmittance is measured in accordance with JIS K 7375 (2008).

[0027] A flexible radio wave control body 11 is attached to the entire outer peripheral surface of the peripheral side portion 36 by an attachment means such as an adhesive. The radio wave control body 11 absorbs, reflects or scatters radio waves to block radio waves, and may be a radio wave absorber that absorbs and blocks incident radio waves, a radio wave reflector that reflects and blocks incident radio waves, or a radio wave scatterer that scatters and blocks incident radio waves. The radio wave control body 11 may be a combination of two or more of a radio wave absorber, a radio wave reflector and a radio wave scatterer. The radio wave control body 11 of this embodiment blocks radio waves with a frequency of 3 to 300 GHz (wavelength of 1 mm to 100 mm). The radio wave control body 11 is transparent and can transmit visible light. The configuration of the radio wave control body 11 will be described in detail later.

[0028] The area including the radio wave control body 11 on the bottom wall 32 and peripheral wall 33 constituting the box main body 30, and the area including the radio wave control body 11 on the top wall 42 and peripheral wall 43 constituting the cover member 40 described later, are referred to as the radio wave control area R. In other words, the radio wave control area R is an area where the radio wave control body 11 is provided on the base 34. In this embodiment, the peripheral wall 33 of the box main body 30 is composed of the peripheral side part 36 of the base 34 and the radio wave control body 11, and the entire surface of the peripheral wall 33 is the radio wave control area R. The radio wave control area R blocks radio waves and is transparent. The total light transmittance of the radio wave control area R under the D65 standard light source is set to 65% or more, more preferably 80% or more, and even more preferably 90% or more.

[0029] The details of the mounting structure of the radio wave control body 11 to the peripheral side part 36 of the base 34 will be described later, but as shown in Figs. 2 and 8, one radio wave control body 11 is bent and wrapped around the outer circumferential surface of the peripheral side part 36, and the opposing first end 11a and second end 11b of the radio wave control body 11 are butted against each other. The first end 11a and the second end 11b have butting surfaces that butt against each other, and the butting surfaces are fitted together. In this embodiment, the first end 11a and the second end 11b extend in the vertical direction.

[0030] The abutment surface of the lower end (fourth end 11d) of the radio wave control body 11 has an edge formed with a waveform W whose shape corresponds to the waveform W formed on the upper surface 37a of the peripheral end 37 of the bottom wall 32 of the box main body 30 described later, and fits into the upper surface 37a of the peripheral end 37 of the bottom wall 32 of the box main body 30.

[0031] 3, in a state in which the lid member 40 covers the opening 31 of the box body 30 (hereinafter also referred to as a "state in which the lid member 40 and the box body 30 are fitted together"), an upper surface 37a of the peripheral end 37, which is outside the peripheral side portion 36 of the bottom 35, abuts against an underside 43a of a lower end 43b of a peripheral wall 43 of the lid member 40. Hereinafter, the upper surface 37a of the peripheral end 37 of the bottom wall 32 of the box body 30 will also be referred to as the "abutment surface A1," and the underside 43a of the lower end 43b of the peripheral wall 43 of the lid member 40 will also be referred to as the "abutment surface A2."

[0032] An edge 37b of an upper surface 37a of a peripheral end 37 of the bottom 35 is undulating in a direction perpendicular to the up-down direction Y of the anechoic box 20 (i.e., when viewed from the side of the anechoic box 20) along the circumferential direction X of the anechoic box 20, and has a waveform W shape in which the same shape appears periodically. The circumferential direction X of the anechoic box 20 is the direction X in which the peripheral end 37 extends, and the up-down direction Y of the anechoic box 20 is the direction Y in which the peripheral end 37 and the lower end 43b of the lid member 40 butt against each other. In this embodiment, the waveform W is a waveform W in which semicircular shapes and inverted semicircular shapes are alternately and continuously arranged, as shown in FIG. 9(A).

[0033] On an upper surface 37 a of a peripheral end portion 37 of the bottom portion 35 , corrugated projections and recesses extend along the radial direction of the anechoic box 20 .

[0034] As described later, a waveform W is formed on an edge 43c of a lower surface 43a (abutting surface A2) of the peripheral wall 43 of the lid member 40 in a shape corresponding to the waveform W on an edge 37b of an upper surface 37a (abutting surface A1) of the peripheral end portion 37 of the box body 30, and the abutting surfaces A1, A2 fit together when the lid member 40 and the box body 30 are fitted together. Note that, although the waveform W has a periodic and identical shape in this embodiment, it is sufficient that the waveform W has a shape that allows the abutting surfaces A1, A2 to fit together, and it is not necessary for the waveform W to be periodic or have the same shape.

[0035] The waveform W is not limited to the shape shown in Fig. 9(A) and may be, for example, the shapes shown in Fig. 9(B) to Fig. 9(D) and Fig. 10(A) to Fig. 10(E). Note that the description of the connection structure of the radio wave control body 11 described later and the waveform W of the edge of the ends 11a to 11d of the radio wave control body 11 shown in Fig. 9 and Fig. 10 also applies to the waveform W formed on the box main body 30 and the lid member 40.

[0036] In this way, the shape of the edge of the end of the radio wave control body 11 and the wall 32, 33, 42, 43 is the above-mentioned waveform W, and the abutting surface where they abut against each other is formed with unevenness that follows the unevenness of this waveform W, which is referred to as "a waveform is formed." The end includes the edge and the abutting surface.

[0037] The abutting surfaces A1 and A2 may be flat surfaces without the corrugation W. In this case, the edges 37b and 43c of the abutting surfaces A1 and A2 are straight lines when viewed from the side of the anechoic box 20.

[0038] The second radio wave control body 21 is attached over the entire surface of the upper surface 35a of the bottom portion 35, which is located inside the peripheral side portion 36, by an attachment means such as an adhesive. The bottom portion 35 of the base 34 and the second radio wave control body 21 constitute the bottom wall 32 of the box main body 30. The second radio wave control body 21 may be any one of a radio wave absorber, a radio wave reflector, and a radio wave scatterer, and may be formed by connecting two or more of these. In this embodiment, the second radio wave control body 21 is a radio wave absorber, which absorbs radio waves to reduce the radio waves reflected in the internal space S of the radio wave anechoic box 20 and shields radio waves. As the second radio wave control body 21, a material that absorbs radio wave energy by converting it into heat is used, and for example, a material containing carbon or the like is used. In addition, the second radio wave control body 21 is opaque and does not transmit visible light. Note that the second radio wave control body 21 may be made of the same material as the radio wave control body 11 attached to the peripheral side portion 36. Also, a transparent second radio wave control body 21 may be used. Furthermore, the second radio wave control body 21 may be attached to the entire lower surface of the bottom portion 35 by an attachment means such as an adhesive. The second radio wave control body 21 is not limited to a radio wave absorber, and may be a radio wave reflector or a radio wave scatterer.

[0039] The upper surface 33a of the upper end portion 33b of the peripheral wall 33 of the box body 30 is a surface where the upper surface of the peripheral side portion 36 of the base 34 and the upper end surface of the radio wave control body 11 are continuous, and is an abutting surface that abuts against a lower surface 42a of a peripheral end portion 42b of an upper wall 42 of the lid member 40 described later when the lid member 40 and the box body 30 are fitted together. In this embodiment, the upper surface 33a of the upper end portion 33b of the peripheral wall 33 of the box body 30 and the lower surface 42a of the peripheral end portion 42b of the upper wall 42 of the lid member 40 are flat surfaces. Hereinafter, the upper surface 33a of the upper end portion 33b of the peripheral wall 33 of the box body 30 will also be referred to as the "abutting surface B1," and the lower surface 42a of the peripheral end portion 42b of the upper wall 42 of the lid member 40 will also be referred to as the "abutting surface B2."

[0040] The abutment surfaces B1 and B2 may be formed with a waveform W. The shape of the waveform W may be the same as that of the abutment surfaces A1 and A2, but is not limited thereto and may be a different shape.

[0041] (Configuration of the cover member 40) The cover member 40 has an upper wall 42 and a peripheral wall 43, is generally cylindrical with an open lower end, and includes a base 44, and the radio wave control body 11 and the third radio wave control body 22 attached to the base 44. The base 44 has an upper part 45 that is circular in a plan view, and an annular peripheral side part 46 that stands on the periphery of the upper part 45. The upper part 45 and the peripheral side part 46 are made of synthetic resin, and are integrally formed by injection molding.

[0042] The radio wave control body 11 is attached to the entire outer peripheral surface of the peripheral side portion 46 by an attachment means such as an adhesive. The peripheral wall 43 of the cover member 40 is composed of the peripheral side portion 46 of the base 44 and the radio wave control body 11, and the entire surface of the peripheral wall 43 is the radio wave control region R. The lower surface 43a of the lower end portion 43b of the peripheral wall 43 of the cover member 40 is a surface where the lower end surface of the peripheral side portion 46 of the base 44 and the lower end surface of the radio wave control body 11 are continuous, and the edge 43c of the lower end portion 43b is a waveform W of a shape corresponding to the waveform W of the edge 37b of the peripheral end portion 37 of the bottom wall 32 of the box body 30. As described above, when the cover member 40 and the box body 30 are fitted together, the lower surface 43a of the lower end portion 43b of the peripheral wall 43 is the abutment surface A2 that abuts against the upper surface 37a (abutment surface A1) of the peripheral end portion 37 of the bottom wall 32 of the box body 30.

[0043] The third radio wave control body 22 is attached to the upper surface of the upper portion 45 over the entire surface thereof by an attachment means such as an adhesive. The upper portion 45 and the third radio wave control body 22 constitute the upper wall 42 of the cover member 40. The third radio wave control body 22 may be any one of a radio wave absorber, a radio wave reflector, and a radio wave scatterer, and may be formed by connecting two or more of these. In this embodiment, the third radio wave control body 22 is a radio wave reflector that reflects radio waves, and is opaque and made of a conductive metal plate made of, for example, aluminum, stainless steel, etc. The third radio wave control body 22 may be made of the same material as the radio wave control body 11 attached to the peripheral side portion 46. A transparent radio wave reflector may also be used.

[0044] The lower surface 42a of the peripheral end portion 42b of the upper wall 42 is a flat surface, and the lower surface 42a is an abutment surface B2 that abuts against the upper surface 33a (abutment surface B1) of the peripheral wall 33 of the box body 30 when the lid member 40 and the box body 30 are fitted together.

[0045] The rest of the configuration of the cover member 40 is similar to that of the box body 30, so a description thereof will be omitted.

[0046] Furthermore, the third radio wave control body 22 may be attached by an attachment means such as an adhesive to the lower surface of the upper portion 45 of the cover member 40 in an area in contact with the internal space S. The third radio wave control body 22 is not limited to a radio wave reflector that reflects radio waves, and may be a radio wave absorber.

[0047] (The cover member 40 and the box body 30 are fitted together) 3, when the lid member 40 closes the opening 31 of the box body 30 and the lid member 40 and the box body 30 are fitted together, the lid member 40 is placed over the box body 30 so that the peripheral wall 43 of the lid member 40 is located outside the peripheral wall 33 of the box body 30. At this time, when the radio wave anechoic box 20 is viewed from the side, the peripheral wall 43 of the lid member 40 and the peripheral wall 33 of the box body 30 overlap, and the upper surface 37a (abutment surface A1) of the peripheral end 37 of the bottom wall 32 of the box body 30 abuts against the lower surface 43a (abutment surface A2) of the lower end 43b of the peripheral wall 43 of the lid member 40, so that the concaves and convexes of the waveforms W are fitted together. Also, the upper surface 33a (abutment surface B1) of the upper end 33b of the peripheral wall 33 of the box body 30 abuts against the lower surface 42a (abutment surface B2) of the peripheral end 42b of the upper wall 42 of the lid member 40.

[0048] The abutment surfaces A1, A2, B1, and B2 are located on the curved walls of the lid member 40 and the box body 30. In this embodiment, the abutment surfaces A1 and A2 are located on the peripheral end 37 of the curved bottom wall 32 of the box body 30 and the curved peripheral wall 43 of the lid member 40 in a plan view. The abutment surfaces B1 and B2 are located on the curved peripheral wall 33 of the box body 30 and the curved peripheral end 42b of the top wall 42 of the lid member 40.

[0049] Conventionally, when the radio wave anechoic box has a rectangular parallelepiped shape (including a cubic shape), the abutting surfaces A1, A2 and B1, B2 are generally located at the corners of the rectangular parallelepiped shape (six sides of the rectangular parallelepiped shape) or extend linearly on each surface of the rectangular parallelepiped shape, which is a flat surface. In this case, gaps are likely to be formed at the corners of the rectangular parallelepiped shape, and radio waves are likely to leak from these gaps. In addition, when the radio wave control body 11 is bent along the shape of the corners, radio waves are likely to leak from the bent portion of the radio wave control body 11. When the abutting surfaces A1, A2 and B1, B2 are formed linearly on a flat surface, the radio waves blocked by the radio wave anechoic box are transverse waves, so that the radio waves easily penetrate into the radio wave anechoic box through these linear gaps or leak out from the radio wave anechoic box to the outside.

[0050] In this embodiment, the radio wave anechoic box 20 has fewer corners by being cylindrical, and the abutting surfaces A1, A2 and the abutting surfaces B1, B2, which generate gaps, do not need to be provided at the corners. In addition, the peripheral wall 43 of the lid member 40, the peripheral end 37 of the box body 30, the peripheral end 42b of the upper wall 42 of the lid member 40, and the peripheral wall 33 of the box body 30, which are the walls on which these abutting surfaces A1, A2 and the abutting surfaces B1, B2 are provided, are curved, so the gaps are also curved. Compared to when the gap extends linearly in a plane, radio waves are less likely to pass through the gaps, and radio waves are blocked. In this embodiment, the box body 30 and the lid member 40 are cylindrical, and when the peripheral lengths of the peripheral wall 43 of the lid member 40, the peripheral end 37 of the box body 30, the peripheral end 42b of the upper wall 42 of the lid member 40, and the peripheral wall 33 of the box body 30 as viewed from above are sufficiently smaller than the wavelength of the radio waves, radio waves are blocked more effectively.

[0051] The inner diameter of the peripheral wall 43 of the lid member 40 is set to be approximately the same as the outer diameter of the peripheral wall 33 of the box body 30. As shown in Fig. 3, when the lid member 40 and the box body 30 are fitted together, the inner surface of the peripheral wall 43 of the lid member 40 and the outer surface of the peripheral wall 33 of the box body 30 are in contact with each other. This contact generates a frictional force between the peripheral wall 43 of the lid member 40 and the peripheral wall 33 of the box body 30, making it difficult for the lid member 40 to come off from the box body 30. However, the inner diameter of the peripheral wall 43 of the lid member 40 may be set to be larger than the outer diameter of the peripheral wall 33 of the box body 30, forming a gap between the peripheral walls 33 and 43.

[0052] Since the peripheral wall 43 of the cover member 40 and the peripheral wall 33 of the box body 30 are transparent radio wave control area R, the inside of the radio wave anechoic box 20 can be seen through the peripheral wall 43 of the cover member 40 and the peripheral wall 33 of the box body 30.

[0053] (Using the anechoic box 20) When the radio wave anechoic box 20 is used, a measurement object D is placed in the internal space S defined by the box body 30 and the lid member 40. The measurement object D is, for example, a mobile phone. Radio waves from the outside and radio waves emitted from the measurement object D are blocked by the radio wave control body 11 and the second radio wave control body 21 provided in the box body 30, and the radio wave control body 11 and the third radio wave control body 22 provided in the lid member 40. When evaluating the performance of the measurement object D, the influence of external radio waves can be suppressed as much as possible, and the radio waves emitted by the measurement object D are prevented from leaking out.

[0054] The internal space S of the anechoic box 20 may accommodate measuring instruments such as a thermometer and a hygrometer in addition to the measurement object D. Furthermore, power for operating the accommodated measuring instruments may be supplied in a non-contact manner from a wireless device that is the measurement object D accommodated in the internal space S of the anechoic box 20.

[0055] According to the above configuration, the peripheral wall 43 of the lid member 40 and the peripheral wall 33 of the box body 30 are radio wave control regions R through which visible light passes. Therefore, when the box body 30 and the lid member 40 are fitted together and the peripheral wall 33 of the box body 30 and the peripheral wall 43 of the lid member 40 overlap, visible light passes through the peripheral wall 33 of the box body 30 and the peripheral wall 43 of the lid member 40, and the internal space S of the anechoic box 20 can be viewed from the outside. Therefore, the measurement object D and information displayed on the monitor of the measuring device can be viewed from the outside, improving workability.

[0056] Furthermore, since the radio wave anechoic box 20 is provided with the radio wave control body 11 and the first and second radio wave control bodies 21 and 22, the internal space S of the radio wave anechoic box 20 can be shielded from radio waves from the outside.

[0057] In this embodiment, when the box body 30 and the lid member 40 are fitted together, the abutment surfaces A1 and A2 come into contact with each other, and the abutment surfaces B1 and B2 come into contact with each other. At this time, small gaps are generated between the abutment surfaces A1 and A2 and between the abutment surfaces B1 and B2. However, the peripheral wall 43 of the lid member 40 on which the abutment surfaces are provided and the peripheral portion 37 of the bottom wall 32 of the box body 30 are circular in plan view and therefore curved, and the gap is also curved and does not extend in a straight line as in the prior art, making it difficult for radio waves to pass through the gap, resulting in radio waves being blocked.

[0058] Furthermore, a waveform W is formed on the abutting surfaces A1, A2, and the gap between the abutting surfaces A1, A2 becomes uneven in the abutting direction Y. Since the gap does not extend in a straight line when viewed from the side as in the conventional technology, it becomes difficult for radio waves to pass through this gap, and the radio waves are blocked.

[0059] (Modification of the Overall Shape of the Electromagnetic Wave Anechoic Box 20) In the modified example shown in FIG. 4 and FIG. 5, the upper surface 33a (butting surface A1) of the upper end portion 33b of the peripheral wall 33 of the box body 30 butts against the lower surface 43a (butting surface A2) of the lower end portion 43b of the peripheral wall 43 of the cover member 40, and the cover member 40 and the peripheral walls 33, 43 of the box body 30 do not overlap when viewed from the side. In this embodiment, the butting surfaces A1, A2 are located at the center in the vertical direction of the anechoic box body 20, and the cover member 40 and the box body 30 are formed to have approximately the same size and shape except for the second and third radio wave control bodies 21, 22. However, the butting surfaces A1, A2 may be provided at the upper or lower positions in the vertical direction of the radio wave anechoic box 20. The edge 33c of the butting surface A1 and the edge 43c of the butting surface A2 may have a waveform W of a shape corresponding to each other, or may be a flat surface. The other configurations are the same as those of the embodiment shown in FIG. 1 to FIG. 3, so a description thereof will be omitted.

[0060] As shown in FIG. 6, the radio wave anechoic box 20 may have a spherical overall shape. In the example of FIG. 6, the cover member 40 and the box body 30 are half-split bodies made of hemispheres of the same size and shape, and the upper surface 30a (butting surface A1) of the upper end of the box body 30 and the lower surface 40a (butting surface A2) of the lower end of the cover member 40 butt against each other. In this embodiment, the butting surfaces A1 and A2 are formed with corrugations W of corresponding shapes, but may be flat surfaces. The cover member 40 and the box body 30 may be entirely formed as the radio wave control region R, or a part of the region may be formed as the radio wave control region R. The other configurations are the same as those of the embodiment shown in FIG. 1 to FIG. 3, so the description will be omitted.

[0061] Furthermore, the overall shape of the anechoic box 20 may be an ellipsoid. The overall shape may be a shape that combines at least one of a sphere, a cylinder, and an ellipsoid with another shape. For example, in FIG. 6, the lid member 40 and the box body 30 are hemispherical, but the box body 30 may be cylindrical and the lid member 40 may be hemispherical. The abutment surfaces A1 and A2 of the lid member 40 and the box body 30 are provided on a sphere, a cylinder, or an ellipsoid.

[0062] The overall shape of the anechoic box 20 may be a cube or a rectangular parallelepiped. In this case, the abutting surfaces A1 and A2 are provided on a flat surface, but the abutting surfaces A1 and A2 are formed with waveforms W of corresponding shapes, thereby blocking radio waves.

[0063] In addition, in the above-described embodiment, the radio wave anechoic box 20 is composed of the cover member 40 and the box body 30, but the box body 30 or the cover member 40 may be further divided into two or more parts, and each divided part may be fitted together.

[0064] (Modifications of the cover member 40 and the bases 34, 44 of the box body 30) In the above-described embodiment, the radio wave control region R of the box body 30 and the lid member 40 is formed by attaching the flexible radio wave control body 11 to the surfaces of the bases 34, 44 by means of an attachment means such as an adhesive. However, in the radio wave control region R, the bases 34, 44 may also serve as the base material layer 13 of the radio wave control body 11.

[0065] The radio wave control body 11, details of which will be described later, includes a conductive layer 16 including conductors 12, and a base material layer 13 that holds the conductive layer 16. To create the radio wave control region R of the box main body 30, the conductive layer 16 is formed on the outer peripheral surface of the peripheral side portion 36 of the base 34 using conductive nano-ink technology. An adhesive layer 14 and a protective layer 15 are formed on the conductive layer 16 as necessary. That is, the base 34 becomes the base material layer 13 of the radio wave control body 11, and the peripheral wall 33 of the box main body 30 becomes the radio wave control region R made of the radio wave control body 11. The radio wave control region R of the lid member 40 is created in the same manner as the box main body 30.

[0066] In particular, in the case of an embodiment in which the overall shape is a sphere, an ellipsoid, or a cylinder, it is difficult to attach the flexible sheet-like radio wave control body 11 to a curved surface because wrinkles will form. However, according to the above configuration, in the radio wave control region R, the bases 34, 44 also serve as the base layer of the radio wave control body 11, making it easy to provide the radio wave control region R on a curved surface.

[0067] (Modification of the location where the radio wave control region R is provided) 1 to 3, the entire peripheral wall 43 of the cover member 40 and the entire peripheral wall 33 of the box body 30 are transparent radio wave control regions R. However, the radio wave control region R may be provided only in a portion of the top wall 42 and peripheral wall 43 of the cover member 40 and the bottom wall 32 and peripheral wall 33 of the box body 30. In this case, the areas other than the radio wave control region R include an opaque radio wave control body. The opaque radio wave control body may be a radio wave reflector such as a conductive metal plate, or may be a radio wave absorber.

[0068] The radio wave control region R may be provided in at least two orthogonal directions of the box body 30 and the lid member 40. This makes it possible to visually check the interior from two orthogonal directions, and to grasp the depth of the internal space S. For example, the radio wave control region R may be provided in a region that is part of the upper wall 42 of the lid member 40, the peripheral wall 43 of the lid member 40, and the peripheral wall 33 of the box body 30, and that is aligned when the box body 30 and the lid member 40 are fitted together. Also, one radio wave control region R may be provided in the peripheral wall 43 of the lid member 40 and the peripheral wall 33 of the box body 30 so as to include two orthogonal directions.

[0069] (Modifications of abutment surfaces A1, A2, B1, B2) In the above embodiment, when the box body 30 and the lid member 40 are fitted together, the butt surfaces A1 and A2 butt against each other, and the butt surfaces B1 and B2 butt against each other. A gasket may be provided between the butt surfaces A1 and A2 and between the butt surfaces B1 and B2. The gasket is a sponge-like member having electrical conductivity and elasticity. The gasket adheres closely to the butt surfaces A1, A2 and B1, B2 without any gaps to prevent radio waves from leaking. When the butt surfaces A1, A2 and B1, B2 are corrugated, the corrugation of the gasket's contact surface with the butt surfaces A1, A2 and B1, B2 corresponds to the corrugation of the butt surfaces A1, A2 and B1, B2. When the butt surfaces A1, A2 and B1, B2 are flat, the contact surface of the gasket is flat.

[0070] (Connection structure of radio wave control body 11) 7 and 8 show the connection structure of the radio wave control body 11. In this embodiment, the radio wave control body 11 is a flexible sheet-like member. A sheet-like shape means that the thickness of the object is 10% or less of the maximum length between the outer edges in a planar view. Membranes, foils, films, and the like are also included in the term "sheet." In this embodiment, the radio wave control body 11 is substantially rectangular in plan view when placed on a flat surface, and has the same thickness.

[0071] 7, a first end 11a of a radio wave control unit 11 is butted against and connected to a second end 11b of another radio wave control unit 11. The first end 11a and the second end 11b have butt surfaces that butt against each other.

[0072] The edge 11e of the first end 11a of the radio wave control body 11, i.e., the edge 11e of the abutting surface, is undulating and has a waveform W shape that periodically appears as the same shape when viewed from a direction perpendicular to the direction X in which the first end 11a extends and the direction Y in which they abut against each other, i.e., when viewed from the plane of the radio wave control body 11. The waveform W is preferably a symmetric wave in which the shape is repeatedly inverted in the concave-convex direction every half period of the waveform W. In this embodiment, as shown in Fig. 7 and Fig. 9(A), the waveform W has a shape in which a semicircle shape and an inverted semicircle shape are alternately continuous along the direction X in which the first end 11a extends. The diameter L20 of the semicircle is set shorter than the half wavelength of the radio wave blocked by the radio wave control body 11. The half wavelength of the radio wave means 1 / 2 the length of the wavelength of the radio wave. It is preferable that the diameter L20 is set sufficiently smaller than the half wavelength of the radio wave. When the length of an object (here, diameter L20) is sufficiently shorter than half the wavelength of the radio wave, this preferably means that the length of the object is more than half the wavelength of the radio wave / 20 and less than half the wavelength of the radio wave / 2, and more preferably more than half the wavelength of the radio wave / 20 and less than half the wavelength of the radio wave / 10.

[0073] The edge 11e of the second end 11b of the other radio wave control body 11 has a waveform W that corresponds to the edge 11e of the first end 11a of the other radio wave control body 11. The corresponding shapes mean that the convex portion of the edge 11e of the second end 11b fits into the concave portion of the edge 11e of the first end 11a, and the convex portion of the edge 11e of the first end 11a fits into the concave portion of the edge 11e of the second end 11b without any gaps. The waveform W of the first end 11a of the radio wave control body 11 and the waveform W of the second end 11b of the other radio wave control body 11 fit into each other, thereby connecting the adjacent radio wave control bodies 11.

[0074] The radio wave control body 11 has a rectangular shape and is provided with a second end 11b, a third end 11c, and a fourth end 11d. The edge 11e of the second end 11b of the radio wave control body 11 may have a waveform W corresponding to the edge 11e of the first end 11a. The first end 11a of another radio wave control body 11 may be further connected to this second end 11b. The edge 11e of the third end 11c and the edge 11e of the fourth end 11d may have waveforms W corresponding to each other, like the first end 11a and the second end 11b. The fourth end 11d and the third end 11c of another radio wave control body 11 may be connected to this third end 11c and the fourth end 11d. In this manner, a plurality of radio wave control bodies 11 may be connected in a sheet-like manner by connecting the first to fourth ends 11a to 11d of one radio wave control body 11 to the first to fourth ends 11a to 11d of another radio wave control body 11.

[0075] Furthermore, any one of the other ends 11b to 11d of the radio wave control body 11 may be connected to the first end 11a of the same radio wave control body 11. In the example shown in Fig. 8, the radio wave control body 11 is bent so that the first end 11a and the second end 11b are connected to each other, forming a cylindrical shape.

[0076] The radio wave control bodies 11 to be connected may be the same or may have different functions. The radio wave control bodies 11 may be any one selected from a radio wave reflector, a radio wave absorber, and a radio wave scatterer and connected. The radio wave control bodies 11 to be connected may be made of different materials and have different configurations.

[0077] (Modification of waveform W) The shape of the waveform W is not limited to the example shown in Fig. 9(A), and may be, for example, the following shapes: Fig. 9(A) to Fig. 9(B) are examples in which the waveform W is composed of curved lines.

[0078] 9B is a waveform W in which semi-ellipse and inverted semi-ellipse are alternately arranged in succession. It is preferable that the major axis L21 of the semi-ellipse is set to be sufficiently shorter than the half wavelength of the radio wave.

[0079] The waveform W shown in Fig. 9(C) is a waveform W in which an arc with a central angle of 180 degrees or more (270 degrees in Fig. 9(C)) and an arc with a shape inverted in the concave direction of this arc are repeated. It is preferable that the half period L22 of this waveform W is set to be sufficiently shorter than the half wavelength of the radio wave.

[0080] In this example, the maximum width L30 of the convex portion of the waveform W is greater than the minimum width L31 of the opening of the concave portion. When the first end 11a and the second end 11b of the radio wave control body 11 are fitted together, the concaves and convexes of the waveform W of the first end 11a and the second end 11b are prevented from coming loose. Even if a pulling force acts on adjacent radio wave control bodies 11 in the direction in which the ends 11a and 11b butt against each other, the connection of the radio wave control bodies 11 can be prevented from coming loose.

[0081] The maximum width L30 of the convex portion of the waveform W refers to the maximum value of the length of the convex portion along the direction X in which the ends 11a, 11b extend when the waveform W is viewed as a convex portion in FIG. 9(C), and the minimum width of the opening of the concave portion refers to the minimum value of the length of the concave portion along the direction X in which the ends 11a, 11b extend when the waveform W is viewed as a concave portion.

[0082] 9(D) is a sine wave. It is preferable that the half cycle L23 of the sine wave is set to be sufficiently shorter than the half wavelength of the radio wave.

[0083] The waveform W may be composed of straight lines. In the waveform W composed of a plurality of straight lines, it is preferable that the length of each straight line is set sufficiently shorter than half the wavelength of the radio wave. Examples of the waveform W including straight lines include a triangular wave, a rectangular wave, and a polygonal wave. Fig. 10(A) and Fig. 10(B) show examples of a triangular wave. Fig. 10(A) shows a regular triangular wave, and the waveform W is composed of a first straight line W1 inclined with respect to the direction Y in which the ends 11a and 11b butt against each other, and a second straight line W2 having an inverted shape of the first straight line W1, and the length of the first straight line W1 is the same as that of the second straight line W2.

[0084] FIG. 10B shows a sawtooth wave, which is composed of a first straight line W1 extending in a direction Y in which the ends 11a, 11b meet, and a second straight line W2 inclined with respect to the direction Y in which the ends 11a, 11b meet.

[0085] 10(C) and 10(D) show examples of rectangular waves. FIG. 10(C) shows a square wave, which is made up of a first straight line W1 extending in a direction Y in which the ends 11a and 11b butt against each other, a second straight line W2 extending from one end of the first straight line W1 in a direction X in which the ends 11a and 11b extend, and a third straight line W3 extending from the other end of the first straight line W1, which is parallel to the second straight line W2. The first straight line W1 to the third straight line W3 have the same length. Note that the waveform W may be a rectangular wave in which the second straight line W2 and the third straight line W3 have the same length, and the length of the first straight line W1 is longer or shorter than the lengths of the second straight line W2 and the third straight line W3.

[0086] The waveform W shown in Fig. 10(D) is a trapezoidal wave. It is composed of a first straight line W1 inclined with respect to the direction Y in which the ends 11a, 11b butt against each other, a second straight line W2 that has an inverted shape of the first straight line W1, and a third straight line W3 that connects one end of the first straight line W1 and one end of the second straight line W2 and extends in the direction X in which the ends 11a, 11b extend. The first straight line W1 and the second straight line W2 have the same length, and are inclined so as to approach each other as they move toward the side to which the third straight line W3 is connected.

[0087] The waveform W shown in Fig. 10(E) is an inverted trapezoidal wave. It differs from Fig. 10(D) in that the first straight line W1 and the second straight line W2 are inclined so as to move away from each other toward the side to which the third straight line W3 is connected. In this example, the maximum width L30 of the convex portion of the waveform W is larger than the minimum width L31 of the opening of the concave portion. Therefore, even if a pulling force acts on adjacent radio wave control bodies 11 in the direction in which the ends 11a and 11b butt against each other, it is possible to prevent the connection between the radio wave control bodies 11 from coming undone.

[0088] The waveform W is not limited to the examples of FIGS. 9 and 10, but may have any shape and may be composed of lines including curved and straight lines.

[0089] In addition, when the waveform W of the end of the radio wave control body 11 is a circular arc wave shown in FIG. 9(C) or an inverted trapezoidal wave shown in FIG. 10(E), the maximum width L30 of the convex part of the waveform W is larger than the minimum width L31 of the opening of the concave part. Therefore, even if the first end 11a and the second end 11b of the radio wave control body 11 are butted against each other along the direction Y, the first end 11a and the second end 11b cannot be fitted together. Therefore, when connecting the radio wave control body 11, the first end 11a and the second end 11b are not butted together along the direction Y in which the ends 11a and 11b butt together, but are brought close to each other along the thickness direction of the radio wave control body 11, so that the concaves and convexes of the waveform W are fitted together. The thickness direction of the radio wave control body 11 is a direction perpendicular to the direction Y in which the ends 11a and 11b butt together and the direction X in which the first end 11a and the second end 11b extend.

[0090] (Cutting jig 50 for cutting out radio wave control unit 11 and method for producing radio wave control unit 11) The method for producing the radio wave control body 11 includes a step of cutting a sheet-like radio wave control body base material (not shown) made of a material that blocks radio waves to the desired size using a cutting jig 50 to cut out the radio wave control body 11.

[0091] An example of a cutting jig 50 is shown in Fig. 11. The cutting jig 50 has a rotary blade 51, a gripping rod 52, and a connecting member 53 that connects the gripping rod 52 and the rotary blade 51. The rotary blade 51 is supported on the tip of the connecting member 53 so as to be rotatable in forward and reverse directions. The peripheral end of the rotary blade 51 is a blade formed in a shape corresponding to the waveform W formed on the ends 11a to 11d of the radio wave control body 11 described above.

[0092] An operator grasps the gripping rod 52 and moves the cutting jig 50 while rotating the rotary blade 51 over the radio wave control body substrate, thereby cutting out the radio wave control body 11 from the radio wave control body substrate. The cut out radio wave control body 11 has a desired size with the edge 11e of the ends 11a to 11d forming a waveform W.

[0093] Another example of a cutting jig is shown in Figure 12. The cutting jig 60 in Figure 12 is a so-called pinking scissors, and includes a first blade body 61 and a second blade body 62 that is provided so as to overlap the first blade body 61. The first blade body 61 has a support shaft 63, and the second blade body 62 is supported by the support shaft 63 so as to be freely rotatable. The support shaft 63 has a retaining portion 63a at its tip that has a larger diameter than the remaining portion of the support shaft 63.

[0094] The first blade body 61 has a gripping portion 61a formed on one side across the support shaft 63 for an operator to grip the scissors, and a metallic blade portion 61b formed on the other side for cutting the radio wave control body 11. The blade portion 61b has a substantially L-shaped cross section along a plane perpendicular to the longitudinal direction, and one side of the L-shape is a blade 61c on which a waveform W is formed. The waveform W has a shape corresponding to the waveform W formed on the ends 11a to 11d of the radio wave control body 11.

[0095] The second blade body 62 has a gripping portion 61a formed on one side across the support shaft 63 for an operator to grip the scissors, and a metallic blade portion 62b formed on the other side for cutting the radio wave control body 11. The blade portion 62b has a substantially L-shaped cross section along a plane perpendicular to the longitudinal direction, and one side of the L-shape is a blade 62c on which a waveform W is formed, and the blades 61c and 62c are disposed opposite each other and cooperate with each other to cut out the radio wave control body 11 from the radio wave control body substrate.

[0096] The worker grasps the gripping portions 61a, 62a of the first blade body 61 and the second blade body 62, positions the radio wave control body substrate between the blade portions 61b, 62b, and rotates the first blade body 61 and the second blade body 62 to cut out the radio wave control body 11 from the radio wave control body substrate.

[0097] Another example of the cutting tool is shown in Fig. 13. The cutting tool 70 in Fig. 13 is a push-cut type cutter (cutting machine) that is used by placing it on a top plate of a desk or the like. The cutting tool 70 includes a base 71 on which the radio wave control body 11 is placed, and an upper blade 72. One end of the upper blade 72 is supported rotatably on the side surface of the base 71, and includes an upper blade main body 72b and a blade 72a formed at an angle of 90 degrees to the blade main body 72b. The blade 72a is formed in a waveform W. The waveform W has a shape corresponding to the waveform W formed on the ends 11a to 11d of the radio wave control body 11.

[0098] The base 71 comprises a base body 71a on which the radio wave control body 11 is placed, a lower blade 75 provided along the edge of the upper surface of the base body 71a, an upper wall 73 provided along an edge perpendicular to the edge on which the lower blade 75 is provided, and a positioning member 74 extending in a direction perpendicular to the upper wall 73.

[0099] The lower blade 75 has a blade 75a with a waveform W formed on an end portion in the width direction. When the upper blade 72 is lowered toward the lower blade 75, the blade 75a of the lower blade 75 and the blade 72a of the upper blade 72 cooperate to cut out the radio wave control body 11 from the radio wave control body substrate. The positioning member 74 is fitted to the upper wall 73 so as to be able to slide freely along the upper wall. The cutting jig 70 may further be provided with a safety cover or the like that covers the side surface of the upper blade 72.

[0100] The worker lifts the upper blade 72 and places the radio wave control body substrate on the upper surface of the upper wall 73. At that time, the end of the radio wave control body substrate is pressed against the upper wall 73 and the positioning member 74 to position the radio wave control body substrate so that the planned cutting position corresponds to the blade 75a of the lower blade 75. The worker then lowers the upper blade 72, thereby cutting out the radio wave control body 11 from the radio wave control body substrate.

[0101] Another example of the cutting tool is shown in Fig. 14. The cutting tool 80 in Fig. 14 is another example of a push-cut type cutter, and has an upper case 82 provided on the upper surface of a base 81, and an upper blade (not shown) and a moving mechanism such as a clamp for moving the upper blade in the vertical direction are provided inside the upper case 82. The moving mechanism includes a U-shaped arm 83, and the arm 83 is supported by a support member (not shown) so as to be freely rotatable in the vertical direction. Positioning members 84 and 85 are provided on the upper surface of the base 81. The positioning members 84 and 85 are perpendicular to each other, and the positioning member 85 is freely movable along the positioning member 84. A lower blade that cooperates with the upper blade to cut out the radio wave control body 11 from the radio wave control body base material is provided on the upper surface of the base 81 covered by the upper case 82 at a position corresponding to the upper blade.

[0102] The worker places the radio wave control body base material on the upper surface of the base 81, and positions the radio wave control body base material using the positioning members 84, 85. The worker lowers the arm 83, thereby enabling the radio wave control body 11 to be cut out from the radio wave control body base material.

[0103] The cutting tool is not limited to the above-mentioned examples, and may be of any form as long as it can cut out the radio wave control body 11, and further examples include a laser cutter, a hand nibbler, a wave cutter, etc. The cutting tool may also be a cutting device that integrates a device for feeding the radio wave control body base material to the blade, a blade that cuts the radio wave control body base material to cut out the radio wave control body 11, a device for recovering the cut out radio wave control body 11, etc.

[0104] (Details of Radio Control Unit 11) (Overall configuration of radio wave control unit 11) The configuration of the radio wave control body 11 of this embodiment will be described below with reference to Figures 15 and 16. The radio wave control body 11 of this embodiment is a radio wave reflector that reflects radio waves. The radio wave control body 11 has a conductive layer 16 including a conductor 12, a base layer 13 that holds the conductive layer 16, a protective layer 15 that holds the conductive layer, and an adhesive layer 14 for bonding the conductive layer 16 and the protective layer 15, and is laminated in the order of the base layer 13, the conductive layer, the adhesive layer 14, and the protective layer 15.

[0105] The radio wave control unit 11 includes a conductor 12 for blocking radio waves. When the radio wave control unit 11 is attached to a wall or the like and laid flat, it reflects radio waves having an incident frequency of 3 GHz or more and 5 GHz or less, 25 GHz or more and 30 GHz or less, or 100 GHz or more and 300 GHz or less.

[0106] The incident angle of the incident wave is at least a certain angle between 15 degrees and 75 degrees, preferably 45 degrees, and more preferably all angles between 15 degrees and 75 degrees. At this time, there is one frequency at which the intensity of the reflected wave when the incident wave is regularly reflected by the radio wave control unit 11 is between -30 dB and 0 dB with respect to the incident wave. Preferably, at a frequency of 28.5 GHz, the regular reflection intensity is between -30 dB and 0 dB with respect to the incident wave. More preferably, in the entire frequency band between 20 GHz and 60 GHz, the regular reflection intensity is between -30 dB and 0 dB with respect to the incident wave, and even more preferably, in the entire frequency band between 3 GHz and 300 GHz, the regular reflection intensity is between -30 dB and 0 dB with respect to the incident wave. The "regular reflection intensity" is the reflection intensity at which the radio wave is reflected, and refers to the intensity of the reflected wave when the incident wave is regularly reflected. The term "flat" refers to a state without any irregularities or curves.

[0107] The regular reflection intensity is preferably -25 dB or more and 0 dB or less with respect to the incident wave, more preferably -22 dB or more and 0 dB or less, even more preferably -20 dB or more and 0 dB or less, and even more preferably -15 dB or more and 0 dB or less. When the regular reflection intensity is -30 dB or more with respect to the incident wave, the radio wave control body 11 can reflect the radio wave while maintaining a high reflection intensity. In this embodiment, the regular reflection intensity and the reflection intensity are values ​​when the distance between the reflection point of the radio wave control body 11 and the radio wave source and the distance between the reflection point of the radio wave control body 11 and the receiving part are 1 m.

[0108] The radio wave control body 11 according to this embodiment is quadrilateral (including square and rectangle) in plan view as shown in Fig. 16. The length L10 of one side of the radio wave control body 11 is, for example, preferably 20 cm or more, more preferably 100 cm or more, and even more preferably 200 cm or more. On the other hand, there is no particular upper limit to the length L10 of one side of the radio wave control body 11, but it is, for example, 400 cm or less. If the length L10 of one side is 20 cm or more, radio waves are easily reflected with sufficient strength.

[0109] The shape of the radio wave control body 11 is not limited to a rectangle, and may be a geometric shape such as a triangle, pentagon, hexagon, circle, ellipse, etc., or may be a non-geometric shape. In the radio wave control body 11, the maximum dimension of the distance between the edges is preferably 20 cm or more and 400 cm or less. The "maximum dimension of the distance between the edges" refers to the diagonal dimension when the radio wave control body 11 is rectangular, refers to the diameter dimension when the radio wave control body 11 is circular, and refers to the length of the major axis when the radio wave control body 11 is elliptical.

[0110] The thickness L1 of the radio wave control body 11 is preferably 0.01 mm or more, more preferably 0.05 mm or more, and even more preferably 0.2 mm or more. On the other hand, the upper limit of the thickness L1 of the radio wave control body 11 is preferably 0.5 mm or less, and more preferably 0.4 mm or less. When the thickness L1 of the radio wave control body 11 is 0.01 mm or more, the radio wave control body 11 can maintain its strength while having flexibility. When the thickness L1 of the radio wave control body 11 is 0.5 mm or less, the radio wave control body 11 is less likely to bend when curved, and as a result, stress concentration is less likely to occur in the conductor 12. The term "bend" used here means bending accompanied by plastic deformation in any layer of the radio wave control body 11.

[0111] The radio wave control body 11 preferably has visible light transmittance as a whole. In other words, the radio wave control body 11 is preferably transparent. The base layer 13, the conductive layer 16, the adhesive layer 14, and the protective layer 15 may be formed of a material having visible light transmittance and / or to a thickness having visible light transmittance.

[0112] The radio wave control device 11 preferably has a total light transmittance of 65% or more, more preferably 75% or more, and even more preferably 80% or more.

[0113] (Configuration of each layer of radio wave control body 11) Each layer of the radio wave control body 11 will be described in more detail below. In the following description, the direction in which each layer is stacked is defined as the up-down direction, and the up-down direction of the radio wave control body 11 is along the up-down direction in FIG. 15. The vertical and horizontal directions are also defined based on FIG. 16. The up-down direction and the vertical and horizontal directions are used for the purpose of explanation, and do not define the up-down direction and the vertical and horizontal directions when the radio wave control body 11 is used, such as when it is attached to a building or the like. Also, the drawings are not shown to actual scale. Also, in FIG. 16(A), the adhesive layer 14 and the protective layer 15 are omitted from part of the radio wave control body 11.

[0114] (Base material layer 13) In this embodiment, the base layer 13 has an outer shape formed in a square shape in a plan view. However, the shape is not limited thereto, and may be a rectangle, a circle, an ellipse, a sector, a polygon, a three-dimensional shape, or the like, according to the overall shape of the radio wave control body 11. A synthetic resin sheet is used as the base material that is the base layer 13. Examples of the synthetic resin include one or more types selected from the group consisting of PET (polyethylene terephthalate), polyethylene, polypropylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, polyester, polyformaldehyde, polyamide, polyphenylene ether, vinylidene chloride, polyvinyl acetate, polyvinyl acetal, AS resin, ABS resin, acrylic resin, fluororesin, nylon resin, polyacetal resin, polycarbonate resin, polyamide resin, and polyurethane resin.

[0115] In this embodiment, the thickness L2 (length in the vertical direction in FIG. 15) of the base layer 13 is uniform, and the thickness L2 is set to 0.13 mm, but is not limited to this and is set appropriately depending on the mode of use of the radio wave control body 11. The thickness does not have to be uniform, and may be formed, for example, in a wedge shape, or may be formed in a three-dimensional shape having a partially spherical surface or an uneven shape. Note that the base layer 13 may contain any material such as a synthetic resin or any member in addition to the base material.

[0116] (Conductive layer 16) The conductive layer 16 is preferably formed by forming one or more linear conductors 12 as a thin film on the upper surface of the base layer 13. All of the conductors 12 constituting the conductive layer 16 are formed on the upper surface of the base layer 13.

[0117] The conductor 12 is preferably made of, for example, silver (Ag). The conductor 12 may be made of any metal, metal compound, or alloy having free electrons, and is not limited to silver. For example, the conductor 12 may be made of gold, copper, platinum, aluminum, titanium, silicone, indium tin oxide, and alloys (for example, alloys containing nickel, chromium, and molybdenum). Examples of alloys containing nickel, chromium, and molybdenum include various grades of Hastelloy B-2, B-3, C-4, C-2000, C-22, C-276, G-30, N, W, and X.

[0118] In this embodiment, as shown in FIG. 16(B), one or more linear conductors 12 are arranged surrounding a region 12a where there are no conductors 12. That is, the conductive layer 16 is a region where the conductors 12 and the regions 12a where there are no conductors 12 are arranged periodically at a predetermined interval. The linear shape means that the length in the longitudinal direction is 3000 times or more the length in the direction perpendicular to the longitudinal direction. In the example shown in FIG. 16(B), a plurality of first linear bodies 12A and a plurality of second linear bodies 12B constituting the conductor 12 are arranged along the longitudinal direction and the lateral direction parallel to the edge of the square base layer 13. The first linear bodies 12A and the second linear bodies 12B are arranged at equal intervals, and the region surrounded by two adjacent first linear bodies 12A and two adjacent second linear bodies 12B is the region 12a where there are no conductors 12. The regions 12a without the conductor 12 are squares of the same shape. In other words, a plurality of regions 12a without the conductor 12 are arranged in the vertical and horizontal directions at intervals of the line width L6 of the conductor 12. The first linear body 12A and the second linear body 12B are electrically conductive at the intersections where they overlap.

[0119] The line width L6 of the conductor 12 is preferably set to 0.05 μm or more and 15 μm or less. The interval L7 between adjacent conductors 12 along the vertical or horizontal direction (the length of one side of the square region 12a where there is no conductor 12) is set to be greater than the wavelength of visible light and smaller than the wavelength of the radio wave reflected by the radio wave control body 11, and in this example, is set to 2 μm or more and 10 cm or less. More preferably, it is 20 μm or more and 1 cm or less, and even more preferably, it is 25 μm or more and 1 mm or less. Still more preferably, it is 30 μm or more and 250 μm or less. When the region 12a where there is no conductor 12 is not a square, the maximum length between any two points on the end of the region 12a where there is no conductor 12 is set to the above length. In addition, the region 12a where there is no conductor 12 may be filled with the adhesive of the adhesive layer 14.

[0120] The thickness (film thickness) L3 of the conductor 12 is preferably a thickness that allows visible light to pass through. The thickness L3 of the conductor 12 is preferably 0.05 μm or more and 10 μm or less. From the viewpoint of ensuring appropriate radio wave intensity, the thickness L3 is preferably 5 nm or more.

[0121] The conductive layer 16 preferably has a coverage of 1% or more and 50% or less, more preferably 1% or more and 10% or less. The coverage refers to the ratio of the area occupied by the conductor 12 per unit area in the region on the upper surface of the base material layer 13 where the conductive layer 16 is provided in a plan view. The region on which the conductive layer 16 is provided is the region on the upper surface of the base material layer 13 excluding the peripheral end portion of the base material layer 13 (the portion between the edge of the base material layer 13 and the conductive layer 16). The coverage is measured using a scanning electron microscope (SEM), a transmission electron microscope (TEM), an optical microscope, or the like.

[0122] In this way, since the coverage of the conductive layer 16 is small and the thickness L3 of the conductor 12 is thin, the radio wave control body 11 becomes transparent and can transmit visible light. Furthermore, the radio wave control body 11 of this embodiment is used in the above-mentioned anechoic chamber 20, and in order to prevent radio waves from leaking out of the anechoic chamber 20, the thickness L3 of the conductor 12 is appropriately set according to the intensity of the radio waves emitted by the measurement object D.

[0123] 16(B), the shape of the region 12a where there is no conductor 12 is square, but the arrangement of the conductors 12 is not limited to this. For example, the distance between adjacent conductors 12A extending in the horizontal direction and the distance between adjacent conductors 12B extending in the vertical direction may be different, and the shape of the region 12a where there is no conductor 12 may be rectangular. Furthermore, the conductors 12 may be arranged so that the shape of the region 12a where there is no conductor 12 is a triangle, a circle, a polygon with pentagons or more sides, or the like.

[0124] (adhesive layer 14) The adhesive layer 14 is for bonding the protective layer 15 onto the base layer 13 and the conductive layer 16, and is made of an adhesive. The adhesive layer 14 has a size corresponding to the base layer 13 in a plan view. A synthetic resin or rubber adhesive sheet is used as the adhesive of the adhesive layer 14. Examples of synthetic resin include acrylic resin, silicone resin, and polyvinyl alcohol resin. The thickness L4 of the adhesive layer 14 is the distance between the upper surface of the conductive layer 16 and the lower surface of the protective layer 15, and is set to 150 μm in this embodiment, but is not limited thereto. The adhesive of the adhesive layer 14 may be filled in the region 12a of the conductive layer 16 where the conductor 12 is not present and the peripheral end of the base layer 13 (the portion between the edge 13a of the base layer 13 and the conductive layer 16). The adhesive layer 14 may contain any substance such as a synthetic resin or any member in addition to the adhesive.

[0125] (Protective layer 15) The protective layer 15 has a size corresponding to the base layer 13 in a plan view, protects the conductor 12, and is made of a protective material. A synthetic resin sheet (film) is used as the protective material of the protective layer 15. Examples of the synthetic resin include one or more selected from the group consisting of PET (polyethylene terephthalate), COP (cycloolefin polymer), polyethylene, polypropylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, polyester, polyformaldehyde, polyamide, polyphenylene ether, vinylidene chloride, polyvinyl acetate, polyvinyl acetal, AS resin, ABS resin, acrylic resin, fluororesin, nylon resin, polyacetal resin, polycarbonate resin, polyamide resin, and polyurethane resin. The thickness L5 of the protective layer 15 is preferably set to 0.02 mm or more and 0.30 mm or less. The protective layer 15 may contain any substance such as a synthetic resin or any member in addition to the protective material.

[0126] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit of the present invention. The dimensions, materials, shapes, and relative arrangements of the components described as embodiments or shown in the drawings are merely illustrative examples, and are not intended to limit the scope of the present invention. For example, expressions expressing relative or absolute arrangements such as "in a certain direction," "along a certain direction," "parallel," "orthogonal," "center," "concentric," or "coaxial" not only strictly express such arrangements, but also express a state in which they are relatively displaced with a tolerance or an angle or distance to the extent that the same function is obtained. For example, expressions expressing that things are in an equal state, such as "same," "equal," and "homogeneous," not only strictly express a state in which they are equal, but also express a state in which there is a tolerance or a difference to the extent that the same function is obtained. For example, expressions expressing shapes such as a square shape or a cylindrical shape not only express shapes such as a square shape or a cylindrical shape in the strict geometric sense, but also express shapes including uneven parts and chamfered parts to the extent that the same effect is obtained. The expressions "comprise", "include", "have", "include", or "have" one component are not exclusive expressions that exclude the presence of other components. In addition, expressions with "approximately" such as "approximately parallel" or "approximately perpendicular" may be used. For example, "approximately parallel" means that it is substantially "parallel", and includes not only a strictly "parallel" state but also an error of a few degrees. The same applies to other expressions with "approximately". In addition, expressions with "part" such as "end" may be used. For example, "end" means a part having a certain range that includes the "end". The same applies to other expressions with "part". [Explanation of symbols]

[0127] 11 Radio Control Body 11a~11d End 11e Edge 12 Conductors 13 Base material layer 14 Adhesive layer 15 Protective layer 16 Conductive layer 20 Anechoic box 21 The Second Radio Control Body 22 The Third Radio Control Body 30 Boxes 31 Aperture 32 Bottom wall 33 Peripheral wall 33b Upper end of the peripheral wall 34 Foundation 37 Peripheral edge of bottom wall 37b Edge of the peripheral end of the bottom wall 40 Lid member 42 Upper Wall 42b Peripheral edge of upper wall 43 Peripheral wall 43b Lower end of peripheral wall 43c Lower edge of peripheral wall 44 Foundation 50, 60, 70, 80 Cutting jig A1, A2, B1, B2 Abutment surface R Radio Control Area S interior space W waveform X End Extension Direction Direction in which the Y end hits

Claims

1. A connection structure of a radio wave control body for connecting different ends of a radio wave control body that blocks radio waves, or connecting ends of the radio wave control body and another radio wave control body, A connection structure of a radio wave control body, in which the edges of the ends of the radio wave control body or the other radio wave control body are undulating when viewed from a direction perpendicular to the direction in which the ends extend and the direction in which they butt against each other, and the edges of the connected ends are wavy and fit together.

2. A radio wave control unit that blocks radio waves, The edge of the end of the radio wave control body is wavy and uneven when viewed from a direction perpendicular to the direction in which the end portions extend and the direction in which they butt against each other.

3. The radio wave control body according to claim 2 , wherein an end of the radio wave control body is coupled to another end of the same radio wave control body or to an end of another radio wave control body.

4. 4. The radio wave control device according to claim 2, wherein the waveform is composed of straight lines.

5. The waveform is any one of a triangular wave, a rectangular wave, and a polygonal wave, 5. The radio wave control body according to claim 4, wherein the length of the straight lines constituting the waveform is shorter than half the wavelength of the radio waves blocked by the wall.

6. 4. The radio wave control device according to claim 2, wherein the waveform is constituted by a curve.

7. When the waveform is a waveform in which semicircular shapes and inverted semicircular shapes are alternately and continuously arranged, the diameter of the semicircles is shorter than half the wavelength of the radio waves blocked by the wall, 7. The radio wave control body according to claim 6, wherein when the waveform is a waveform in which semi-ellipse and inverted semi-ellipse are alternately and continuously arranged, the major axis of the semi-ellipse is shorter than half the wavelength of the radio waves blocked by the wall.

8. a conductive layer including a conductor, a base layer for holding the conductive layer, a protective layer for holding the conductive layer, and an adhesive layer for bonding the conductive layer and the protective layer, the base layer, the conductive layer, the adhesive layer, and the protective layer being laminated in this order; 4. The radio wave control device according to claim 2, wherein the conductive layer has regions without conductors surrounded by one or more linear conductors, the regions being arranged periodically at predetermined intervals.

9. It is made up of walls that block radio waves and has an internal space that is shielded from radio waves from the outside. A radio wave anechoic box comprising the radio wave control device according to claim 2 or 3 provided on at least a portion of said wall.

10. 4. A cutting jig for cutting a sheet-like radio wave control body base material made of a material that blocks radio waves to produce the radio wave control body according to claim 2 or 3.

11. A method for producing a radio wave control body, comprising the step of cutting a sheet-like radio wave control body base material made of a material that blocks radio waves to cut out the radio wave control body according to claim 2 or 3.

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