GB2452665A

GB2452665A - Radio wave shielding partitioning plane material and method for manufacturing

Info

Publication number: GB2452665A
Application number: GB0823663A
Authority: GB
Inventors: Satoshi Sakai; Takeshi Ikeda; Toshio Kudo; Kazuyuki Kashihara; Katsunori Hosotani
Original assignee: Mitsubishi Cable Industries Ltd
Current assignee: Mitsubishi Cable Industries Ltd
Priority date: 2006-06-02
Filing date: 2007-05-31
Publication date: 2009-03-11
Anticipated expiration: 2027-05-31
Also published as: TW200817564A; WO2007142125A1; KR20090015995A; GB2452665B; GB0823663D0

Abstract

Provided is a radio wave shielding partitioning plane material which can freely adjust radio wave environment as needed. A radio wave shielding layer (12) for shielding from radio waves is arranged on the surface of a plane material main body (11) arranged to partition a space.

Description

1 2452665

DESCRIPTION

RADIO SHIELDING PARTITIONING PLANE MATERIAL AND METHOD FOR

MANUFACTURING THE SAME

Technical Field

[0001] The present invention relates to a ratio shielding partitioning plane material and a method for manufacturing it.

Background Art

[0002] In recent wide-spreading use of radio equipment typified by an intra-business PHS, a wireless LAN, and the like, it becomes essential to adjust radio environment in an office for preventing information leakage and preventing malfunction and noise caused by radio invasion from outside. There have been proposed various types of members for maintenance of the radio environment in an office and the like (Patent Documents 1,2, and the like, for example) [0003] For example, Patent Document 1 discloses a technique for restricting input and output of radio waves through a framework of a building by constructing the framework of the building with concrete with which an electromagnetic shielding member is mixed.

Patent Document 1: Japanese Examined Patent Application Publication No. 6-99972

Summary of the Invention

Problems that the Invention is to Solve [0004] In the technique disclosed in Patent Document 1, however, the radio waves are always shielded inside the building. For this reason, the radio environment cannot be adjusted according to needs that, for example, the inside of the building is in a radio shielding state only during the time when radio shielding is necessary, such as time when using a wires LAN in the building while on the other hand the radio shielding state is released during the other time when radio shielding is not necessary. As another example, in the case where a wall, a ceiling, a floor, or the like for partitioning a room of a building is made of concrete with which an electromagnetic shielding member is mixed so that a radio wave used within the rooms does not leak outside, no communication using a wireless LAN cannot be provided between the rooms in the building unless the electromagnetic shielding member is removed by breaking the wall or the like with which the electromagnetic shielding member is mixed. Namely, the conventional technique involves difficulty in flexible adjustment of the radio environment.

[0005] The present invention has been made in view of the foregoing and has its object of providing a radio shielding partitioning plane material capable of flexibly adjusting a radio environment according to needs.

Means for Solving the Problems [0006] To attain the above object, a radio shielding partitioning plane material in accordance with the present invention includes a radio shielding layer provided on the surface of a plane main body for shielding a radio wave and is used for partitioning a space in an openable manner. In the present description, the plane main body means a concept including a plate-shaped member, a sheet-shaped member, a cloth member, and a film-shaped member. Examples thereof may be a shutter, a curtain, a blind, a window, a partition, a rolling screen, a veil, and the like.

[0007] The thus structured radio shielding partitioning plane material can flexibly adjust the area of the radio shielding layer covering the boundary between the spaces (specifically, a wall, a partition, or the like) or an opening (specifically, a window or the like).

Accordingly, in the present invention, input/output of the radio wave to and from a space can be restricted by, for example, covering the opening of the space or the boundary between the spaces according to needs. While on the other hand, input/output of the radio wave can be allowed by uncovering a part or all of the opening of the space or the boundary between the spaces. In other words, the radio shielding characteristics can be adjusted flexibly to change the radio environment arbitrarily.

[0008] Further, the above radio shielding partitioning plane material can be installed at a necessary part of an existing building or the like according to needs. Accordingly, a radio 1 3 shielding space can be provided appropriately in a building having no radio shielding characteristics. As well, a plurality of radio shielding spaces can be formed in a single room.

[0009] For example, in a case using different wireless LANs in different rooms in a building, in order to suppress crosstalk of the radio wave between adjacent rooms, the radio shielding partitioning plane material according to the present invention may be provided at a wall or a door for partitioning the adjacent rooms to produce a state capable of flexibly adjusting input/output of the radio wave between the adjacent rooms according to needs.

[0010] The radio shielding layer may be formed of one or plural conductive films.

Alternatively, a plurality of antennas may be provided for selectively shielding radio waves in least one specified frequency band. With this arrangement, a space can be formed to and from which input and output of the radio waves in the specified frequency band are restricted selectively, and the radio shielding characteristics (radio environment) in the specified frequency band in the space can be adjusted flexibly. As concrete examples of such antennas, there are: antennas each including three first element parts radially extending from the antenna center to form angels of 120 degrees and having substantially the same length and a linear second element part connected to the outer end of each of the first element parts (hereinafter the antenna in this shape may be referred to as a T-Y-shaped antenna); a generally-called Y-shaped antenna including only three first element parts radially extending from the antenna center to form angels of 120 degrees; a generally called Jerusalem cross-shaped antenna including four first element parts radially extending from the antenna center to form angels of 90 degrees and having substantially the same length and a linear second element part connected to the outer end of each of the first element parts; and the like.

[00111 Further provided is a radio shielding sheet formed by arranging the radio shielding layer on a base material including an air permeable carrier. In the case where the radio 1 4 shielding layer is provided on the plane main body by attaching the radio shielding sheet to the plane main body, the carrier on at least a part of the surface of which a coating film is provided can be used as the base material. The air permeable carrier may be cloth (woven fabric, non-woven fabric, knit, lace, felt paper, or the like), or the like, for example.

The antennas may be formed of a conductive material.

[0012] In the case where a plurality of pores andlor convexes and concaves are formed in the surface of the carrier, in order to form the plural antennas having highly accurate shape and dimension, the carrier (the base material) must be fixed so that the surface on which the plural antennas are formed becomes flat, namely, so as not to form a wrinide and a slack in the surface. In other words, in the case where the plural antennas are formed directly on the air permeable carrier, it is difficult to hold securely the carrier by sucking so that the surface of the carrier on which the plural antennas are to be formed becomes flat.

This involves difficulty in forming plural antennas having highly accurate shape and dimension, thereby leading to difficulty in attaining increased radio shielding characteristics.

[0013] In contrast, with the above arrangement, at least a part of the surface of the air permeable carrier is coated with the coating film. Accordingly, the base material, which is mainly formed of the air permeable carriers, can be sucked and held at a part thereof which is coated with the coating film. Hence, the base material can be held with the surface thereof kept flat (with neither a wrinide nor a slack formed) in manufacturing the radio shielding partitioning plane material. This enables formation of a plurality of antennas having highly accurate shape and dimension to realize increased radio shielding characteristics. In other words, with the use of the above radio shielding sheet, a radio shielding partitioning plane material having increased radio shielding characteristics can be manufactured easily.

[0014] The air permeable carrier may be held by holding means other than the suction means (for example, be held with the use of an adhesive). This, however, involves 1 5 complicated adhesion/removal steps of the carrier to/from the holding means.

Particularly, holding of the carrier so as to be rather flat involves further complicated adhesion/removal steps thereof and increases difficulty in operation, leading to difficulty in manufacture of a radio shielding sheet (a ratio shielding partitioning plane material) having increased radio shielding characteristics. In contrast, when the carrier is held by suction, the surface on which the plural antennas are to be formed can be held considerably easily with neither a wrinide nor a slack formed therein, when compared with the case where it is held b' the adhesive or the like.

[0015] The above radio shielding layer may be formed directly on the carrier of the base material but is preferably formed on the coating film. Particularly, the surface of the base material is preferably flattened by using the coating film to equalize the thickens of the base material.

[0016] In the case where plural pores and/or convexes and concaves are formed in the surface of the carrier, formation of the antennas directly on the carrier invites spreading (impregnation, especially, spreading over the surface of the face in the face direction), which is caused by invasion of the pores by a material for forming the antennas (for example, a liquid material (ink or the like), and flowing to the concaves. Such spreading or flowing causes variation and inaccuracy in shape and dimension of the antennas, thereby resulting in antennas having no desired radio shielding characteristics and frequency selectivity.

[0017] In contrast, with the above arrangement, the coating film fills the pores and/or convexes and concaves formed in the surface of the carrier to flatten the surface of the base material and to equalize the thickness of the base material. Accordingly, the spreading and the flowing into the concaves are suppressed, thereby resulting in formation of antennas having highly accurate shape and dimension. Hence, further increased radio shielding characteristics and frequency selectivity can be attained.

[0018] The coating film is not limited specifically as long as it can flatten the surface of the base material. Preferably, the coating film is made of an organic material (a polymeric material), such as resin, rubber, or the like, or an inorganic material, such as glass or the like, for example. To such a material, an additive (an age inhibitor, a colorant, or the like) may be blended within a range not inviting lowering of the radio shielding characteristics.

[0019] Each antenna may be formed of a metal film or a metal foil in which at least one opening part is formed (for example, a mesh-shaped metal film or metal foil). If so, the antennas can be less visible. In other words, each antenna, in turn, the radio shielding layer can be less conspicuous. This arrangement is effective especially in the case where a pattern is drawn on the antenna side surface of the carrier and the case where the carrier is transparent.

[0020] A method for manufacturing the radio shielding partitioning plane material with the use of the radio shielding sheet includes the steps of: obtaining the base material by forming the coating film on at least a part of the surface of the carrier; obtaining the radio shielding sheet by forming the plurality of antennas on the base material with the base material sucked and held by suction means; and attaching the radio shielding sheet to the plane main body.

Effects of the Invention [0021] The radio shielding partitioning plane material in accordance with the present invention can adjust a radio environment flexibly according to needs.

Brief Description of the Drawings

[0022] [FIG. 1] FIG. 1 is a perspective view showing a configuration of a rolling screen in accordance with Embodiment 1 of the present invention.

[FIG. 2] FIG. 2 is a sectional view taken along the line Il-Il in FIG. 1.

[FIG. 3] FIG. 3 is a view corresponding to FIG. 1 which shows a use state of the rolling screen.

[FIG. 4] FIG. 4 is a plan view showing a shape of an antenna. (P

[FIG. 5] FIG. 5 is a graph showing the relationship between the frequency of a radio wave incident on the rolling screen and the transmission loss thereof.

[FIG. 6] FIG. 6 is a graph showing the relationship between the element length of the antenna and the frequency of a radio wave reflected by the antenna.

[FIG. 7] FIG. 7 is a perspective view showing a configuration of a curtain in accordance with Embodiment 2 of the present invention.

[FIG. 8] PIG. 8 is a view corresponding to FIG. 7 which shows a state where the curtain is pulled back.

[FIG. 9] FIG. 9 is a perspective view showing a configuration of a Venetian blind in accordance with Embodiment 3 of the present invention.

[FIG. 10] FIG. 10 is a view corresponding to FIG. 9 which shows a state where the blind is pulled back.

[FIG. 11] FIG. 11 is a view corresponding to FIG. 9 which shows a state where each slat of the blind is set to be substantially horizontal.

[FIG. 12] FIG. 12 is a perspective view showing a configuration of a vertical blind in accordance with Embodiment 4 of the present invention.

[FIG. 13] FIG. 13 is a view corresponding to FIG. 12 which shows the state where the blind is pulled back.

[FIG. 14] FIG. 14 is a view corresponding to FIG. 12 which shows the state where each slat of the blind is set to be substantially perpendicular to a boundary face between spaces.

[FIG. 15] FIG. 15 is a top view of a partition in accordance with Embodiment 5 of the present invention.

[FIG. 16] FIG. 16 is a front view of the partition.

[FIG. 17] FIG. 17 is a top view showing the sate where the partition is pulled back.

[FIG. 18] FIG. 18 is a perspective view of a Roman shade in accordance with Embodiment 6 of the present invention.

[FIG. 19] FIG. 19 is a side view of a double side roll screen in accordance with Embodiment 7 of the present invention.

[FIG. 20] FIG. 20 is a plan view showing Modified Example 1 of a radio shielding layer of the present invention.

[FIG. 21] FIG. 21 is a plan view showing a part of the radio shielding layer in an enlarged scale.

[FIG. 22] FIG. 22 is a plan view showing Modified Example 2.

[FIG. 23] FiG. 23 is a plan view showing Modified Example 3.

[FIG. 24] FIG. 24 is a plan view showing Modified Example 4.

[FIG. 25] FIG. 25 is a plan view showing Modified Example 5.

[FIG. 26] FIG. 26 is a plan view showing Modified Example 6.

[FIG. 27] FIG. 27 is a graph showing the correlation between the radio shielding amount (transmission loss of radio wave) and the frequency in a radio shielding layer in Modified Example 6.

[FIG. 28] FIG. 28 is a plan view showing Modified Example 7.

[FIG. 29] FIG. 29 is a plan view showing Modified Example 8.

[FIG. 30] FIG. 30 is a plan view showing Modified Example 9.

[FIG. 31] FIG. 31 is a plan view showing Modified Example 10.

[FIG. 32] FIG. 32 is a plan view showing Modified Example 11.

[FIG. 33] FIG. 33(a) is a plan view of the entirety of an antenna showing Modified Example 12, FIG. 33(b) is an enlarged plan view of the central part of the antenna, and FIG. 33(c) is a plan view showing a part of the antenna in a further enlarged scale.

[FIG. 34] FIG. 34 is a sectional view showing a state where a face of a radio shielding sheet which is opposite to a radio shielding layer is attached to a plane main body in Modified Example 13. p 9

[FIG. 35] FIG. 35 is a side view showing the entirety of the radio shielding sheet in a rolled state and a part of the radio shielding sheet in an enlarged scale.

[FIG. 36] FIG. 36 is a view corresponding to FIG. 34 which shows a state where a face on the radio shielding layer side of the radio shielding sheet is attached to the plane main body in Modified Example 13.

[FIG. 37] FIG. 37 is a view corresponding to FIG. 35 which shows the entirety of the radio shielding sheet in a rolled state and a part of the radio shielding sheet in an enlarged scale.

[FIG. 38] FIG. 38 is a side view showing a state where a base material is sucked and held in an antenna formation step in manufacturing the radio shielding sheet.

[FIG. 39] FIG. 39 is a graph showing the transmission loss of radio shielding sheets in Modified Example 13 and a comparative example.

Index of Reference Numerals [0023] 1, 8 rolling screen 2 curtain 3,4 blind partition 7 double side roll screen 10, 80 support member 11,60,81 planemainbody 12 radio shielding layer 13, 16, 17, 22, 24, 25, 26, 27, 28, 29 antenna 1 3a, 27a first element part l3b, 16b, 17b, 27b, 28b, 29b second element part 14, 18,20 antennaunit 15, 19,21 anterma group 23 antenna row 30,40 space base material 60a carrier 60b coating film

Best Mode for Carrying out the Invention

[0024] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0025] (Embodiment 1) FIG. 1 is a perspective view of a rolling screen 1 in accordance with Embodiment 1, and FIG. 2 is a sectional view taken along the line Il-H in FIG. 1. A radio shielding partitioning plane material of the present invention is described by referring to the rolling screen 1 of Embodiment 1 as one mere example, and therefore, the present invention is not limited to the present embodiment.

[0026] A shown in FIG. 1, the rolling screen 1 is a radio shielding partitioning plane material provided between a space (for example, a room) 30 and a space (for example, a room) 40 for openably portioning the space 30 and the space 40.

[0027] The rolling screen 1 includes a flexible plane main body 11, a radio shielding layer 12 formed on one lib of the surfaces of the plane main body 11, and a support member 10 for rolling up the plane main body 11 into a rolled state. The support member 10 is in a slender shape (for example, a bar shape, a cylindrical shape, or the like) to be transversely and rotatably provided at the upper part of the boundary between the two spaces 30, 40 defmed by walls or the like. Specifically, in the case, for example, where one 30 of the spaces is indoor while the other space 40 is outdoor and the rolling screen 1 is provided at a window between the indoor space 30 and the outdoor space 40, it may be provided rotatably and transversely at the wall or the ceiling above the window. In the case where the spaces 30, 40 belong to a single room, the support member 10 may be rotatably fixed at the ceiling, for example. The support member 10 may be mounted detachably. Further, the support member 10 may be composed of a bar-shaped member non-rotatably mounted at a ceiling or a wall and a cylindrical member through which the bar-shaped member is inserted and which is rotatable relative to the bar-shaped member. In other words, the support member 10 may be composed of a plurality of members.

[0028] The flexible plane main body 11 is fixed at the tip end thereof to the support member 10 (by bonding, adhesion, or engagement) to be rolled to the support member 10.

Pulling another tip end ha of the plane main body 11 allows the plane main body 11 to be fed out from the support member 10. The plane main body 11 can be fixed at an arbitrary pulled position. Namely, the plane main body 11 can be rolled up fully so as not to separate the space 30 and the space 40, and a part or all of the rolled plane main body 11 can be pulled out for covering a part or all of the boundary between the space 30 and the space 40 so as to separate the spaces 30, 40. In the present description, the state that the rolled plane main body 11 is pulled out (referred to it as a closed state) means not only the state that the entire boundary between the spaces 30, 40 is covered with the rolling screen 1.

The boundary between the spaces 30, 40 may not be covered with the rolling screen 1 even in the closed state according to the use state of the radio wave or the strength of the used radio wave.

[0029] The material of the main face body 11 is not limited specifically and may be resin, such as polyurethane resin, polyethylene (PB) resin, polystyrol resin, or the like, cloth, such as woven fabric (plain weave or the like, for example), non-woven fabric, or the like, paper, rubber, or the like. The plane main body 11 may not only function as a mere base material but also function to provide various characteristics (light transmittance, fireproof, fire resistance, non-halogenation, flexibility, impact resistance, heat resistance, and the like) to the rolling screen 1. The color of the plane main body 11 is also not limited specifically and may be transparent so as not to obstruct persons' view between the spaces 30, 40. In reverse, the plane main body 11 may be opaque for obstructing persons' view between the spaces 30, 40. To do so, the same color as that of the surrounding wall or S 12 ceiling may be employed.

[0030] On one lib of the surfaces of the plane main body 11, a radio shielding layer 12 for shielding a radio wave is provided so as to cover the surface lib. In order to avoid crosstalk between different wireless LANs when they are used in the spaces 30, 40, the plane main body 11 having the surface on which the radio shielding layer 12 is formed is pulled out, namely, the area ratio of the radio shielding layer 12 to the boundary between the spaces 30, 40 is set comparatively large, as shown in FIG. 1, to define the spaces 30, 40 by the radio shielding layer 12, thereby restricting input/output of the radio wave between the spaces 30, 40. Accordingly, a radio wave R from the space 30 is reflected by the radio shielding layer 12 to be inhibited from entering into the space 40.

[0031] In contrast, in the case where the same wireless LAN is used between the spaces 30, 40, the plane main body 11 having the surface on which the radio shielding layer 12 is formed is rolled to the support member 10, namely, the area ratio of the radio shielding layer 12 to the boundary between the spaces 30, 40 is set comparatively small, as shown in FIG. 3, to allow the radio waves to be input/output between the spaces 30, 40.

Accordingly, the radio wave R from the space 30 is allowed to enter into the space 40.

[0032] In sum, the rolling screen 1 in accordance with Embodiment I is capable of being opened and closed for flexibly adjusting the radio shielding state according to needs.

[0033] For example, in the case where different wireless LANs are used in a single room, the rolling screen 1 of Embodiment 1 is mounted at the ceiling across, for example, the substantial center of the room so as to be capable of defining regions using the different wireless LANs. As a result, pulling out the plane main body 11 defmes and forms a plurality of radio shielding spaces. Namely, the rolling screen 1 of Embodiment 1 can be mounted in an existing building or room easily to form a plurality of radio shielding rooms in a single room. Further, the rolling screen 1 can be removed when it becomes unnecessary, which leads to further flexible and easy adjustment of the radio environment.

The support member 10 may be curved or bent according to the form of a to-be-defined radio shielding space.

[0034] In Embodiment I, the radio shielding layer 12 shields a radio wave at a specified frequency selectively. Specifically, the radio shielding layer 12 is composed of a plurality of antennas 13 arranged regularly for reflecting the radio wave at the specified frequency selectively. Accordingly, for example, in order to use different wireless LANs between the spaces 30, 40, the spaces 30, 40 are defined by the radio shielding layer 12 by pulling out the plane main body 11 having the surface on which the radio shielding layer 12 is formed, thereby suppressing crosstalk of the wireless LANs used in spaces 30, 40.

While, a radio shielding space allowing input/output of the radio waves other than those used in the wireless LANs (for example, radio waves of mobile phones, PHS, and the like) can be formed and defined. For example, mobile phones and PHSs used in the building can be used in both the spaces 30, 40 with crosstalk of the wireless LANs between the spaces 30, 40 suppressed. Hence, the radio environment can be further flexibly adjusted by using the rolling screen 1 of Embodiment 1.

[0035] The antennas 13 are not specifically limited and may have an aspect as shown in FIG. 1 The aspect of the antennas 3 will be described further in detail below with reference to FIG. 1 and FIG. 4. FIG. 4 is a plan view of an antenna 13.

[0036] As shown in FIG. 4, each antenna 13 in Embodiment 1 includes three first element parts 13a and three second element part 13b (an antenna in this aspect may be called a T-Y-shaped antenna). The three first element parts 13a extend outward from an antenna center Cl to form angels of 120 degrees. Each second element part 13b is connected at the outer end of the associated first element part 13a.

[0037] It is preferable that the first element parts 13a have substantially the same length.

As well, the second element parts 13b have substantially the same length preferably. This further increases the frequency selectivity of the radio shielding layer 12.

[0038] The length LI of each first element part 13a may be different from or equal to the length L2 of each second element part 13b (Li!= L2 or Ll = L2). Preferably, the lengths (Li and L2) of each first element part 13a and each second element part 13b satisfy a relational expression, 0 < L2 < 2(3)'fL1. When L2 ? 2(3)/L1, adjacent second element parts 13b may be in contact with each other to attain no desired radio shielding effects. With a view to attaining a high radio shield factor against a specified frequency, the length L2 of each second element part 13b is preferably in the range between 0.5 time and 2 times, both inclusive, as large as the length Li of each first element part 13a (0.5xLl L2 S 2xLl). More preferably, it is in the range between 0.75 time and 2 times, both inclusive (0.75xL1 L2 2xLl).

[00391 Referring to each width of the first element parts 13a and the second element parts 13b, they may be different from or equal to each other. In the present embodiment, the width of each first element part 13a and the width of each second element part 13b are set substantially the same (L3).

[0040] As described above, each antenna 13 includes the three second element parts 13b connected to the outer ends of the first element parts 13a. Accordingly, each antenna 13 exhibits frequency selectivity higher than a Y-shaped linear antenna and a generally-called Jerusalem cross-shaped antenna (the Y-shaped antenna is a linear antenna composed of only three first element parts extending radially from the antenna center with no second element part included, and the Jerusalem cross-shaped antenna is one including four linear first elements extending radially from the antenna center to form angels of 90 degrees and having the same length to each other and a linear second element part connected to the outer end of each first element part). Hence, the rolling screen 1 of Embodiment 1 has high freq uency selectivity and can appropriately shield only the to-be-shielded radio wave.

[0041] With the second element parts 13b, the plural antennas 13 can be easily arranged so that the second element parts 13b are opposed to each other (preferably, closely).

Arrangement of the antennas 13 so that the second element parts 13b are opposed to each other (and more preferably, close to each other) increases the radio shield factor against the radio wave at the specified frequency.

[0042] For arranging the second element parts 13b to be opposed to each other and arranging much more antennas 13 per unit area, it is preferable that the second element parts 13b are connected at the center thereof to the outer end of the associated first element parts 13a so as to form right angles between the first element parts 13b and the second element parts 13a.

[0043] The radio shielding characteristics of the rolling screen 1 will be described next in detail with reference to FIG. 5 and FIG. 6, wherein the length (Li) of the first element parts 13a is the same as the length (L2) of the second element parts 13b (Li L2, wherein Li and L2 are referred collectively to as an element length L). FIG. 5 is a graph showing the relationship between the frequency of a radio wave incident on the rolling screen 1 and the transmission loss, and FIG. 6 is a graph showing the relationship between the element length L and the frequency of a radio wave reflected by the antennas 13. In FIG. 5, each length LI and L2 is 10.6 mm (LI = L2 = 10.6mm) and the width L3 is 0.7 mm (L3 = 0.7 mm).

[0044] As shown in FIG. 5, the transmission of the radio wave at the specified frequency (approximately 2.7 GHz) is attenuated selectively out of the radio waves incident on the rolling screen 1. In other words, the rolling screen 1 selectively shields the radio wave at the specified frequency (approximately 2.7 GHz) out of the radio waves incident thereon.

This is because the radio shielding layer 12 of the rolling screen 1, specifically, each antennas 13 of the radio shielding layer 12 selectively reflects the radio wave at the specified frequency out of the incident radio waves. As shown in FIG. 6, the length Li of the first element parts 13a and the length L2 of the second element parts 13b (the element length L) correlate to the frequency (the specified frequency) of the ratio wave that the antennas 13 is to reflect. Specifically, the longer the element length L is, the lower the frequency of the radio wave that the antennas 13 is to reflect is. In reverse, the shorter the element length L is, the higher the frequency of the radio wave that the antennas 13 is to reflect is. Accordingly, the length Li of the first element parts 13a and the length L2 of the second element parts 13b can be determined appropriately according to the frequency of a to-be-reflected radio wave. For example, in the case where the length Li of the first element parts 13a and the length L2 of the second element parts 13b are the same (Li = L2), elongation of the lengths LI, L2 of the first element parts 13a and the second element parts 13b can lower the specified frequency. Reversely, shortening of the lengths Li, L2 of the first element parts 13a and the second element parts 13b can increase the specified frequency. Specifically, for forming a rolling screen 1 shielding the radio wave at a frequency of 5 GHz, the length Li of the first element parts 13a and the length L2 of the second element parts 13b are set at approximately 6 mm (Li = L2 6 mm) according to FIG.6.

[0045] In contrast, the frequency of the reflected radio wave correlates not so largely to the width L3. Namely, the frequency of the reflected radio wave is determined mainly according to the element length L. [0046] Alternatively, the specified frequency can be adjusted by adjusting the length L2 of each second element part 13b with the length Li of each first element part 13a fixed, for example. Specifically, elongation of the length L2 of each second element part 13b lowers the specified frequency while shortening of the length L2 of each second element parts 13b increases the specified frequency.

[0047] Preferably, the antennas 13 have conductivity, namely, they contain a conductive material. The conductive material includes aluminum, silver, copper, gold, platinum, iron, carbon, graphite, indium tin oxide (ITO), indium zinc oxide (IZO), a mixture or an alloy thereof, and the like. Among of all, the antennas 13 preferably contain at least one of copper, aluminum, and silver, which have high conductivities and are comparatively low costs.

[0048] Preferably, each antenna 13 has a thickness T in the range between 10 i.m and 20 mJ.L, both inclusive (10 pm T S 20 pm). The antennas 13 having a thickness smaller than 10 pm (T < 10 pm) invite lowering of the conductivity and the radio shield factor of the antennas 13. While on the other hand, those having a thickness larger than 20 pm (T > 20 pm) invite lowering of formability of the antennas 13.

[0049] The antennas 13 may be in a mesh-like shape, for example. Namely, the antennas have a plurality of openings. The mesh-like antennas 13 are less visible. This is effective in the case where the plane main body 11 is transparent or so. In a case using mesh-like antennas 13, mesh patterns which are the same as the mesh patterns of the antennas 13 and have no conductivity are preferably formed around the antennas 13. This allows the antennas 13 to be further invisible.

[0050] The antennas 13 may be formed, for example, in such a manner that a conductive film (for example, an aluminum film, a copper film, a silver film, or the like) is formed on the surface lib of the plane main body 11 by a film forming method, such as sputtering or the like and the thus formed conductive film is patterned into predetermined shape and dimension by a patterning method, such as photolithography. Or, a thin film of aluminum or the like patterned to predetermined shape and dimension is bonded or attached to the plane main body 11 to thus form the antennas 13.

[0051] Alternatively, for example, the antennas 13 may be formed by applying a paste (hereinafter it may be referred to as a conductive paste) obtained by mixing a powder conductive material with a binder to the plane main body 11 uniformly into a predetermined pattern and drying it thereafter. Specifically, the antennas 13 may be formed in such a manner that the paste is formed into the predetermined pattern and is then dried, for example, under an atmosphere at a temperature in the range between 100 °C and CC, both inclusive, for a time period in the range between ten minutes and five hours, both inclusive. The conductive paste for forming the antennas 13 may be one obtained by dispersing and mixing a powder conductive material (for example, silver) in and with polyester resin. In this case, the content C of the conductive material is preferably in the range between 40 wt% and 80 wt%, both inclusive (40 wt% S C S 80 wt%), more preferably, in the range between 50 wt% and 70 wt%, both inclusive (50 wt% S C 70 wt%). The content C lower than 40 wt% (C < 4Owt%) invites lowering of the conductivity of the antennas 13. While on the other hand, it higher than 80 wt% (C> 80 wt%) invites difficulty in dispersing and mixing it in and with the resin. The polyester resin serves as a bonding agent for bonding the conductive material to the plane main body 11.

[0052] In the case where a plurality of pores and/or a plurality of convexes and concaves are formed in the plane main body 11, specifically, where the plane main body 11 is made of cloth (including woven fabric and non-woven fabric) or is a porous body made of concrete, foamy resin, or the like, it is preferable for suppressing variation in shape and dimension of the formed antennas 13, which is caused by impregnation of the paste to the plane main body 11 or unintentional flowing of the paste into the concaves, to coat the plane main body 11 with a coating film prior to formation of the antennas 13 so as to flatten the surface lib and equalize the entire thickness (total thickness of the plane main body 11 and the coating film). The material of the coating film is not limited specifically and may be, for example, resin (specifically, urethane resin, acryl resin, polyester resin, or the like), an organic material, such as rubber or the like, or an inorganic material, such as glass. Among of all, one having less swelling property against the material forming the antennas 13 (for example, a liquid antenna formation material), such as paste is preferable.

The coating film may be formed by roll coating, slit die coating, doctor knife, gravure coating, or the like.

[00531 Alternatively, the antennas 13 can be formed by, for example, spin coating, doctor blade, extrusion coating, spray coating, inkjetting, relief printing, intaglio printing, screen printing, micro gravure coating, silk-screen printing, pattern pressing, etching, sputtering, deposition (chemical vapor deposition (CVD), for example), mist coating, embedding by inlaying, or the like.

[0054] Embodiment 1 refers to the case where the radio shielding layer 12 is formed on one lib of the surfaces of the plane main body 11, but the radio shielding layer 12 may be formed on each surface of the plane main body 11. In so doing, a radio shielding layer formed on one surface of the plane main body 11 may have an aspect different from that formed on the other surface thereof. Specifically, for example, antennas reflecting a radio wave at a frequency different from that reflected by the antennas formed on one surface may be formed on the other surface. This attains shielding of plural kinds of radio waves.

Specifically, in the case where the radio wave at a frequency sent by a wireless LAN is different from the radio wave at a frequency received thereby, it is preferable that a radio shielding layer of a plurality of antennas reflecting the to-be-sent radio wave is formed on one of the surfaces while a radio shielding layer of a plurality of antennas reflecting the to-be-received radio wave is formed on the other surface so that both the to-be-sent radio wave and the to-be-received wave are shielded. Alternatively, the radio shielding layer 12 of the same antennas may be formed on each of the surfaces. This attains further increased shielding characteristics against the radio wave at the specified frequency.

[0055] For attaining further increased radio shielding characteristics, it is preferable to provide a plurality of radio shielding partitioning plane materials with a space left from each other between the spaces 30, 40. Specifically, for example, a shading curtain, a shading rolling screen, a blind, a shutter, or the like as a radio shielding partitioning plane material and a lace curtain, a blind, or the like as another radio shielding partitioning plane material are provided repeatedly (double, triple, or more). In this case, also, the aspects of the radio shielding layers may be the same or different from each other, similarly to the case of the radio shielding layer 12 formed on each surface of the plane main body 11.

[0056] On the radio shielding layer 12, a protection film (for example, a rein film) may be formed for physically or chemically protecting the radio shielding layer 12. Specifically, in the case where the radio shielding layer is made of metal comparatively liable to be oxidized, such as silver, an anti-oxidation film may be formed for suppressing oxidation of the radio shielding layer. In the case where the radio shielding layer is made of metal having comparatively low strength, a protection film made of a material having strength higher than the material forming the radio shielding layer may be formed to increase the mechanical durability of the rolling screen 1.

[0057] The radio shielding layer 12 may be provided inside the plane main body 11.

Namely, the radio shielding layer 12 is not limited in aspect and arrangement specifically as long as it spreads along the surface of the plane main body 11.

[0058] Embodiment I refers to the case where the radio shielding layer 12 is composed of the regularly arranged plural antennas 13. The radio shielding layer 12 may be composed of single or plural conductive films (for example, silver thin films, copper thin films, aluminum thin films, or the like) in the case where all incident radio waves are to be shielded regardless of the frequency. Specifically, the surface 11 b of the rolling screen 1 may be covered with a conductive film.

[00591 Embodiment 1 describes an example of the present invention by referring to a rolling screen as a radio shielding partitioning plane material of the present invention, but the present invention is not limited thereto and may be applied to a window, a veil, and the like. Alternatively, it may be a curtain, a shutter, a blind, a partition, or another face.

[0060] (Embodiment 2) FIG. 7 is a perspective view of a curtain 2 in accordance with Embodiment 2, and FIG. 8 is a perspective view of the curtain 2 that is pulled back.

[0061] In Embodiment 2, the case where the radio shielding partitioning plane material is the curtain 2 will be described. In Embodiment 2, the same reference numerals are assigned to components having substantially the same functions as in Embodiment 1 for

omitting the description.

[0062] The curtain 2 includes a plane main body 11 openably mounted through a plurality of rings to a support member 10 bridged between the spaces 30, 40 and a radio shielding layer 12 formed on the plane main body 11. The curtain 2 can selectively and flexibly set the spaces 30, 40 between a state restricting inputJoutput of radio waves between the spaces 30, 40 by closing the curtain 2 as shown in FIG. 7 and the state allowing input/output thereof between the spaces 30, 40 by opening the curtain 2 as shown in FiG. 8.

Namely, the curtain 2 in accordance with Embodiment 2 enables flexible adjustment of the radio environment according to needs.

[0063] The curtain 2 can be mounted easily to an existing building, room, or the like to adjust flexibly the radio environment of the existing building or room.

[0064] With a view to attaining further increased radio shielding characteristics, curtains 2 may be provided repeatedly between the spaces 30, 40. For example, curtains 2 may be provided as a generally-called double curtain, for example.

[0065] For restricting input/output of a radio wave at a specified frequency between the spaces 30, 40 while allowing input/output of the radio waves at the other frequencies, similarly to Embodiment 1, it is preferable that the radio shielding layer 12 is composed of a plurality of antennas 13 arranged regularly.

[0066] (Embodiment 3) Embodiment 3 describes the case where the radio shielding partitioning plane material is a blind 3 (a generally-called Venetian blind).

[0067J FIG. 9 is a perspective view of the blind 3 in accordance with Embodiment 3, FIG. is a perspective view of the blind 3 that is opened, and FIG. 11 is a perspective view of the blind 3 where the plane main body 11 is set to be substantially horizontal. The same reference numerals are assigned to components having substantially the same functions as in Embodiments land 2 for omitting the description.

[0068] The blind 3 in accordance with Embodiment 3 includes a support member 10 bridged between the spaces 30, 40, a plurality of string members 51 of which one ends are fixed to the support member 10, and a plurality of oblong rectangular face main bodies 11 connected to each other by the string members 51 and located in parallel with each other.

Further included is adjusting means 50 connected to the string members 51 and provided at one end of the support member 10. By the adjusting means 50, the face main bodies 11 connected to each other by the string members 51 are rotated and the blind 3 is pulled up and down.

[0069] In Embodiment 3, the radio shielding layer 12 is formed on at least one of the surfaces of each plane main body 11. Accordingly, when the blind 3 is pulled down by operating the adjusting means 50 to set the face main bodies 11 to be closed (in a substantially perpendicular state) for covering the boundary between the spaces 30, 40 with the radio shielding layer 12, as shown in FIG. 9, inputloutput of the radio wave between the spaces 30, 40 can be restricted. In reverse, for allowing input/output of the radio wave between the spaces 30, 40, the blind 3 is pulled up as shown in FIG. 10, or the face main bodies 11 are rotated to be substantially horizontal with the blind 3 pulled down, as shown in FIG. 11, by operating the adjusting means 50 to be in an opened state.

[0070] The use of the blind 3 of Embodiment 3 enables flexible adjustment of the radio environment according to needs.

[0071] Similarly to the curtain 2, the blind 3 can be mounted easily to an existing building, room, or the like. Accordingly, the blind 3 of Embodiment 3 leads to flexible adjustment of the radio environment of the exiting building or room.

[0072] With a view to attaining further increased radio shielding characteristics, the blind 3 may be provided repeatedly, or the rolling screen 1, the curtain 2, or a shutter or a window including the radio shielding layer may be provided in addition.

[0073] Similarly to Embodiment 1, for restricting input/output of a radio wave at a specified frequency while allowing input/output of the radio waves at other frequencies between the spaces 30, 40, it is preferable that the radio shielding layer 12 is composed of a plurality of antennas 13 arranged regularly.

[00741 (Embodiment 4) Embodiment 3 describes the Venetian blind 3, but the present invention is not limited thereto and may be applicable to a vertical blind. In Embodiment 4, the radio shielding partitioning plane material is a vertical blind 4.

[0075] FIG. 12 is a perspective view of the blind 4 in accordance with Embodiment 4, FIG. 13 is a perspective view of the blind 4 that is pulled back, and FIG. 14 is a perspective view of the blind 4 of which face main bodies 11 are substantially perpendicular to the boundary between the spaces 30, 40. The same reference numerals are assigned to components having substantially the same functions as in Embodiments 1 to 3 for omitting

the description.

[0076] The blind 4 includes a bar-shaped support member 10 bridged between the spaces 30, 40, a plurality of string members 52 fixed at one ends thereof to the support member 10, and a plurality of oblong rectangular face main bodies 11 in parallel to each other connected to the other ends of the string members 52, and string-shaped connection members 53 connecting the plural face main bodies 11. Further included is adjusting means 50 provided at one end of the support member 10 and connected to the string members 52, 53. The plural face main bodies 11 are rotated and the blind 4 is opened/closed by operating the adjusting means 50.

[0077] In Embodiment 4, the radio shielding layer 12 is provided at least one of the surfaces of each plane main body 11 Accordingly, as shown in FIG. 12, when the blind 3 is closed by operating the adjusting means 50 to set the face main bodies 11 to be closed (along the boundary between the spaces 30, 40) for covering the boundary between the spaces 30, 40 with the radio shielding layer 12, input/output of the radio wave between the spaces 30, 40 can be restricted. In reverse, for allowing input/output of the radio wave between the spaces 30, 40, the blind 3 is opened, as shown in FIG. 13, or the face main bodies 11 are rotated to be substantially perpendicular to the boundary between the spaces 30, 40 with the blind 4 closed, as shown in FIG. 14, by operating the adjusting means 50 to be in the opened state.

[0078] With the use of the blind 4 in accordance with Embodiment 4, the radio environment can be adjusted flexibly according to needs, as well.

[0079] Similarly to the curtain 2 and the blind 3, the blind 4 can be mounted easily to an existing building, room, or the like. Accordingly, the use of the blind 4 of Embodiment 4 attains flexible adjustment of the radio environment of the exiting building or room.

[0080] With a view to attaining further increased radio shielding characteristics, the blind 4 may be provided repeatedly, or the rolling screen 1, the curtain 2, the blind 3, or a shutter or a window including the radio shielding layer may be provided in addition.

[00811 In order to restrict input/output of a radio wave at a specified frequency and allow input/output of the radio waves at other frequencies, it is preferable that the radio shielding layer 12 is composed of a plurality of antennas 13 arranged regularly, similarly to Embodiment 1.

[0082] (Embodiment 5) In Embodiment 5, the case where the radio shielding partitioning plane material is an openable partition 5 will be described.

[0083] FIG. 15 is a top view of the partition 15 in accordance with Embodiment 5, FIG. 16 is a front view of the partition 5, and FIG. 17 is a top view of the partition 5 that is opened. In Embodiment 5, the same reference numerals are assigned to components having substantially the same functions as in Embodiments I to 4 for omitting the

description.

[00841 The partition 5 in accordance with Embodiment 5 includes a plurality of longitudinally rectangular face main bodies 11 movably mounted to partition moving rails 54 provided correspondingly to a floor and a ceiling (only one may be provided at the floor or the ceiling) and a radio shielding layer 12 formed on at least one of the surfaces of each plane main body 11.

[0085] The rails 54 are provided between the spaces 30, 40 in a single room (so as to pass the center of the room, for example). As shown in FIG. 15 and FIG. 16, when the plural face main bodies 11 are arranged along the rails 54 so that the boundary between the spaces 30, 40 is covered with the radio shielding layer 12, the spaces 30, 40 can be defined in radio waves. In other words, the partition 5 of Embodiment 5 can defme and form a plurality of radio shielding spaces in a single room. In a case using a wireless LAN 1 25 common to the spaces 30, 40, the main face bodies 11 are moved to a corner along the rails 54 to allow the spaces 30, 40 to communicate with each other. When doing so, input/output of the radio waves between the spaces 30, 40 are allowed.

[0086] With the use of the partition 5 of Embodiment 5, the radio environment can be adjusted flexibly according to needs, as well.

[0087] Similarly to the curtain 2 and the blinds 3, 4, the partition 5 can be mounted easily to an existing building, room, or the like. Accordingly, the use of the blind 5 of Embodiment 5 attains flexible adjustment of the radio environment of the exiting building or room.

[0088] With a view to attaining further increased radio shielding characteristics, the partition 5 may be provided repeatedly, or the rolling screen 1, the curtain 2, the blind 3 or 4, or a window or a shutter including the radio shielding layer may be provided in addition.

[0089] Similarly to Embodiment 1, for restricting input/output of a radio wave at a specified frequency while allowing input/output of the radio waves at other frequencies between the spaces 30, 40, it is preferable that the radio shielding layer 12 is composed of a plurality of antennas 13 arranged regularly.

[0090] (Embodiment 6) Embodiment 2 refers to the transversely openable curtain opened right and left, but the present invention is not limited thereto and may be a Roman shade as one kind of vertically openable curtain. Embodiment 6 describes the case where the radio shielding partitioning plane material is a Roman shade.

[0091] FIG. 18 is a perspective view of a Roman shade 6 in accordance with Embodiment 6. In Embodiment 6, the same reference numerals are assigned to components having substantially the same functions as in Embodiments 1 to 5 for omitting the description.

[0092] As shown in FIG. 18, the Roman shade 6 of Embodiment 6 includes a flexible plane main body 60 formed of a lace, a printed cloth, or the like, a radio shielding layer 12 formed on the plane main body 60, and adjusting means 50. Operation of the adjusting means 50 allows the plane main body 60, which has the surface on which the radio shielding layer 12 is formed, to be pulled up while being folded and be pulled down.

[0093] With the use of the Roman shade 6, similarly to the case of the curtain 2, the spaces can be flexibly and selectively set between the state restricting inputioutput of the radio waves between spaces adjacent to each other with the Roman shade 6 interposed and the state allowing input/output thereof. In other words, for restricting input/output of the radio wave between adjacent spaces, the Roman shade 6 is pulled down by operating the adjusting means 50 to shield the adjacent spaces. In reverse, for allowing input/output of the radio wave between the adjacent spaces, the Roman shade 6 is pulled up by operating the adjusting means 50. Accordingly, the Roman shade 6 of Embodiment 6 can adjust the radio environment of an existing building, room, or the like flexibly according to needs.

[0094] Further, the Roman shade 6 can be mounted easily to an existing building, room, or the like. Accordingly, the use of the Roman shade 6 attains flexible adjustment of the radio environment of the exiting building or room.

[0095] In addition to the Roman shade 6, the curtain 2, the rolling screen 1, the blind 3 or 4, or the like may be provided repeatedly.

[0096] (Embodiment 7) FIG. 19 is a side view of a double side roll screen 7 in accordance with Embodiment 7.

[0097] The double side roll screen 7 in accordance with Embodiment 7 includes the rolling screen 1 described in Embodiment 1 and another rolling screen 8. The rolling screen 8 includes a bar-shaped support member 80 and a flexible plane main body 81 rolled to the support member 80 so as to be capable of being pulled out. Different from the rolling screen 1, the radio shielding layer 12 is not formed on the surface of the rolling screen 8. The double side roll screen 7 is so mounted that the rolling screen 1 including the radio shielding layer 12 is arranged on the outdoor side while the rolling screen 8 including no radio shielding layer 12 is arranged on the indoor side. Namely, in the double side roll screen 7 of Embodiment 7, the rolling screen 8 including no radio shielding layer 12 is additionally arranged on the indoor side of the rolling screen 1 of Embodiment 1.

[00981 Accordingly, with the use of the double rolling screen 7, the radio environment can be adjusted flexibly according to needs, as well as in Embodiment 1. Further, the radio environment of an exiting building or room can be adjusted flexibly.

[0099] In Embodiment 7, the rolling screen 8, which is ordinary, is provided on the indoor side. Accordingly, even in the state in which the plane main body 11 of the rolling screen 1 is pulled down for restricting input/output of the radio waves indoors, when the plane main body 81 of the rolling screen 8 is also pulled down, the radio shielding layer 12 can be invisible from the indoor side. The rolling screen 8, which does not contribute to adjustment of the radio environment, can be designed freely. For example, it can have design and color in harmony with a room. Hence, the use of the double side roll screen 7 of Embodiment 7 attains flexible adjustment of the radio environment and formation of an indoor space harmonious in design.

[0100] For example, in the case where the rolling screen 1 of Embodiment 1 is provided at the window of a room including plain and mono color wall and ceiling, the antennas 13 of the rolling screen 1 are conspicuous to invite loss of design harmony of the room. In contrast, in the case where the double side roll screen 7 including a plain p lane main body 81 of which color is similar to that of the wall and the ceiling, the antennas 13 are not visible from the inside of the room and only the plane main body 81 of which color is similar to that of the wall and the ceiling can be viewed. Hence, design harmony of the indoor space can be kept.

[0101] (Modified Example 1) The radio shielding partitioning plane material has been described in Embodiments 1 to 7 which includes the radio shielding layer 12 composed of one kind of T-Y-shaped antennas 13 arranged in matrix at regular intervals. The configuration of the radio shielding layer 12 in the present invention is not limited thereto. Other aspects of the radio shielding layer 12 (radio shielding layers 12a to 12k) will be described in Modified

Examples ito 11.

[0102] Modified Example I will be described first with reference to FIG. 20 and FIG. 21.

FIG. 20 is a plan view of the radio shielding layer 12a in Modified Example 1, and FIG. 21 is a plan view of a part of the radio shielding layer 12a in an enlarged scale.

[0103] In Modified Example 1, a plurality of antenna group 15, each of which is formed by arranging a plurality of antennas 13 in matrix at regular intervals, are arranged regularly (in matrix, for example) in the radio shielding layer 12a. Specifically, each of a plurality of antenna units 14 is formed of a pair of antennas 13 arranged so that the associated second element parts 13b are opposed to each other, and the antenna units 14 are arranged so that the associated second element parts 13b are opposed to each other, thereby forming a plurality of continuously and two-dimensionally developed hexagonal antenna groups 15.

More specifically, each antenna group 15 is composed of three antenna units 14 arranged so as to form a ring in which the associated second element parts 13b are opposed to each other. In other words, each antenna group 15 is composed of six antennas 13 annularly arranged so that the associated second element parts 13b are opposed to each other.

[0104] In Modified Example 1, 12 second element parts 13b of the 18 second element parts 13b in one antenna group 15 are opposed to each other in parallel with each other closely. This arrangement of the antennas 13 in which comparatively many second element parts 13b are opposed to each other closely further increases the radio wave reflectivity (radio shield factor) of the antennas 13 against a radio wave at a specified frequency. Hence, the radio shielding partitioning plane material can have a high radio shield factor against the radio wave at the specified frequency.

[0105] The shorter the distance Xl (see FIG. 21) between the opposed second element parts 13b is, the higher the radio wave reflectivity of the antennas 13 (the radio shield factor of the radio shielding partitioning plane material) is. Specifically, the distance Xl between the opposed second element parts 13b is preferably in the range between 0.4 mm and 3 mm, both inclusive (0.4 mm 5 Xl 5 3 mm), and more preferably, in the range between 0.6 mm and 1 mm, both inclusive (0.6 mm 5 XIS 1 mm). When the distance Xl is shorter than 0.4 (XI <0.4 mm), the opposed second element parts 13b may be in contact with each other undesirably. When the distance Xl is longer than 3 mm (Xl > 3 mm), the radio shield factor is liable to lower.

[0106] With a view to attaining stable radio shielding characteristics against the radio waves incident at various incident angles, each antenna group 15 preferably forms a hexagon (more preferably, substantially a regular hexagon). This means that it is preferable that the first element parts 13a and the associated second element parts 13b form right angles. Further, the second element parts 13b are preferably connected at the centers thereof to the first element parts 13a.

[0107] (Modified Example 2) FIG. 22 is a plan view of the radio shielding layer 12b in Modified Example 2.

[0108] In Modified Example 2, the antenna groups 15 are arranged in a generally-called honeycombed arrangement so that more second element parts 13b are opposed to each other. Accordingly, in Modified Example 2, all of the second element parts 13b are opposed to each other. This arrangement of the antennas 13 increases the number of the second element parts 13b opposed to each other when compared with that in Modified Example 1. Hence, the radio shielding partitioning plane material has a further higher radio shield factor.

[0109] (Modified Example 3) FIG. 23 is a plan view of the radio shielding layer 12c in Modified Example 3.

[0110] In the above embodiments and modified example, each radio shielding layer 12 is composed of antennas of only one kind. While in Modified Example 3, the radio shielding layer 12c is composed of plural kinds of antennas, as shown in FIG. 23.

Specifically, the radio shielding layer 12c includes two kinds of antennas 16, 17 of t 30 comparatively small antennas 16 and comparatively large antennas 17. The antennas 16 and the antennas 17 are T-Y-shaped antennas similar to the aforementioned antennas 13.

[01111 The large antennas 16 and the small antennas 17 are arranged alternately in matrix so as not to interfere with each other. The antennas 16 and the antennas 17 may be analogous or non-analogous with each other. Further, the radio shielding layer 12c may additionally include antennas different from the antennas 16 and the antennas 17.

[0112] The small antennas 16 and the large antennas 17 are different in frequency selectivity from each other. Namely, the frequencies of the radio waves that the antennas 16, 17 shield are different from each other. Accordingly, in Modified Example 3, the radio shielding partitioning plane material can selectively shield two radio waves of which frequencies are different from each other.

[0113] For example, the radio shielding partitioning plane material in accordance with Modified Example 3 is especially useful in environments using radio waves at plural frequencies, such as an environment using a wireless LAN (which uses radio waves at two frequencies in a frequency band of 2.4 GHz and a frequency band of 5.2 (3Hz) or the like.

[0114] In an environment in which radio waves at three or more frequencies are used, the radio shielding layer 12c may be composed of three or more kinds of antennas different in size from each other.

[0115] (Modified Example 4) FIG. 24 is a plan view of the radio shielding layer 12d in Modified Example 4.

[01161 In Modified Example 4, as well as in Modified Example 3, the radio shielding layer 12d is composed of two kinds of antennas 16, 17 different in size from each other.

The large antennas 16 and the small antennas 17 in this example are the same as the antennas 16 and the antennas 17 in Modified Example, respectively.

[0117] In Modified Example 4, similarly to those in Modified Example 2, each of a plurality of antenna units 18 is formed of a pair of antennas 16 arranged so that the associated second element parts 16b are opposed to each other, and each three antenna units 18 are arranged so that the associate second element parts 16b are opposed to each other, thereby forming a plurality of continuously and two-dimensionally developed hexagonal antenna groups 19. Namely, each antenna group 19 is composed of three antenna units 18 arranged annularly so that the second element parts 16b are opposed to each other. In other words, each antenna group 19 is composed of six antennas 13 arranged annularly so that the second element parts 16b are opposed to each other. The antenna groups 19 are arranged in a generally-called honeycombed arrangement so that the second element parts 1 6b are opposed to each other.

[0118] On the other hand, each of a plurality of antenna units 20 is formed of a pair of antennas 17 arranged so that the associated second element parts 1 7b are opposed to each other, and each three antenna units 20 are arranged so that the associated second element parts 17b are opposed to each other, thereby forming a plurality of continuously and two-dimensionally developed hexagonal antenna groups 21, similarly to the antennas 13 in Modified Example 1. Each antenna group 21 is arranged so as to be surrounded by an antenna group 19.

[0119] In this arrangement, the second element parts 16b of the antennas 16 are opposed to each other and the second element parts 17b of the antennas 17 are opposed to each other at respective high probabilities to attain arrangement of the antennas 16 and 17 at substantially the same density. Accordingly, both the radio wave that the antennas 16 shield and the radio wave that the antennas 17 shield can be shielded at higher frequency selectivity and a higher radio shield factor.

[0120] In Embodiment 4, it is preferable that the lengths of the second element parts 16b, 17b are comparatively short. If so, contact between the antennas 16 and the antennas 17 can be suppressed. In turn, the degree of freedom of dimension of the antennas 17 forming the antenna groups 21 surrounded by the antenna groups 19 can be increased. As a result, a radio shielding partitioning plane material can be realized which can selectively shield two kinds of radio waves at frequencies comparatively closed to each other.

[0121] (Modified Example 5) FIG. 25 is a plan view of the radio shielding layer 12c in accordance with

Modified Example 5.

[0122] Modified Example 5 is a modification of Modified Example 4. In Modified Example 5, the antenna groups 19 and the antenna groups 21 have axes of line symmetry different from each other, and the axes of line symmetry of the antenna groups 19 are aslant with respect to the axes of line symmetry of the antenna groups 21.

[0123] In order to surround the antenna groups 21 by the antenna groups 19, it is necessary to set the dimension of the antennas 17 forming the antenna groups 21 smaller than that of the antenna 16 forming the antenna groups 19. When the antenna groups 19 and the antenna groups 21 are arranged not aslant with respect to each other, as depicted in Modified Example 4, the antennas 17 must be much smaller than the antennas 16 for avoiding crosstalk of the antennas 17 with the antennas 16 to reduce the degree of freedom of the design of the antennas 16 and 17.

[0124] In contrast, in Modified Example 5, when the antenna groups 19 and the antenna groups 21 are disposed aslant with respect to each other (for example, 0 100 as in the example shown by the drawing), the position of opposed second element parts 16b relative to the position of opposed second element parts 17b are displaced about the centers of the antenna groups 19, 21. Accordingly, in Modified Example 5, the size of the antennas 17 can be set comparatively larger than that of the antennas 16 when compared with the case depicted in Modified Example 4. This increases the degree of freedom of the design in shape and dimension of the antennas 16 and 17. As a result, two radio waves of which frequencies are close to each other (a ratio of a first frequency to a second frequency larger than the first frequency is 0.45 or larger) can be shielded.

[0125] FIG. 25 shows a case in which the antenna groups 19 and 21 are disposed the most close to each other. According to a desired radio shield factor, each number of the antenna groups 19 and 21 may be adjusted appropriately without disposing them the most closely.

[0126] (Modified Example 6) The above embodiments and Modified Examples 1 to 5 describe the radio shielding partitioning plane materials capable of selectively shielding a radio wave at one frequency or radio waves at plural frequencies, but the radio shielding partitioning plane material in accordance with the present invention may be capable of selectively shielding radio waves in one or plural frequency bands. Modified Example 6 refers to the case where the radio shielding layer is composed of plural kinds of antennas selectively reflecting radio waves at specified frequencies different from each other so as to be capable of shielding the radio waves in a specified frequency band. Specifically, an example will be described in which the radio shielding layer 12f is composed of three kinds of antennas 22a, 22b, 22c.

[0127] The frequency band means a frequency range of which fractional bandwidth exceeds 10 %. The radio shielding partitioning plane material selectively shielding the radio waves in a specified frequency band means a radio shielding partitioning plane material of which 10 dB fractional bandwidth (preferably, 20 dB fractional bandwidth, and more preferably, 30 dB fractional bandwidth) exceeds 10 %. In contrast, the radio shielding partitioning plane material selectively shielding a radio wave of a specified frequency means a radio shielding partitioning plane material of which 10 dB fractional bandwidth is equal to or lower than 10 %. The fractional bandwidth of 10 dB is expressed by 2(FmaxFmjn)/(Fmax+Fmin) where Fm is a maximum value of the frequency of the radio wave shielded over 10 dB and Fmjn is a minimum value thereof.

[01281 A configuration of the reflection layer 12f in Modified Example 6 will be described below with reference to FIG. 26. FIG. 26 is a plan view of the radio shielding layer 12f in Modified Example 6.

[0129] The radio shielding layer 12f is composed of plural kinds of antennas 22 selectively reflecting radio waves at specified frequencies different from each other, specifically, is composed of first antennas 22a, second antennas 22b, and third antennas 22c. The first antennas 22a, the second antennas 22b, and the third antennas 22c have radio reflection spectrum peaks not independent of each other. In other words, their radio reflection spectrum peaks are continuous. Accordingly, the radio shielding layer 2f in accordance with the present modified example can selectively reflect radio waves in a frequency band having a predetermined width (for example, a frequency band in the range between 815 MHz and 925 MHz, both inclusive). For example, the reflection layer 12f has the radio shielding characteristics (radio transmission loss) shown in FIG. 27. With a view to attaining more excellent continuity of the radio reflection spectrum peaks, it is preferable to set the dimension of the respective antennas 22a to 22c of the radio shielding layer 12f within �15 % (preferably, �10 %, and more preferably, �5 %) of the dimension of antennas of a reference type out of the antennas 22a to 22c.

[0130] FIG. 27 is a graph showing the correlation between the radio shielding amount (radio transmission loss) of the radio shielding layer 12f and the frequency. As can be understood from the graph, a spectrum peak P2 of the first antennas 22a, that P3 of the second antennas 22b, and that P1 of the third antennas 22c are not independent of each other and are continuous. Specifically, a ratio of the depth H2 of the valley from the base line BL to the depth Hi of P1, the highest peak, from the base line BL (ratio of radio reflection (shield) factor) is equal to or smaller than 50 % (3 dB or higher). Accordingly, the radio shielding layer 12f shields (reflects) the radio waves in the entire range of the frequency band between the peaks P1 and P3 at a high radio shield factor of 10 dB or higher. The fractional bandwidth of 10 dB is preferably larger than 10 %.

[0131] The wording, "the radio reflection spectrum peaks are not independent of each other (continuous)" means that a ratio of the minimum radio reflection (shield) factor at a valley between spectrum peaks to the radio reflection (shield) factor at a peak of the largest spectrum out of the radio reflection (shielding) spectrums of the radio shielding partitioning plane material exceeds 50 % (difference between the radio reflection (shield) factor at the peak of the largest spectrum and the lowest radio reflection (shield) factor at a valley is smaller than 3 dB). The wording, "the radio reflection spectrum peaks are independent of each other (not continuous)" means that that a ratio of the minimum radio reflection (shield) factor at a valley between spectrum peaks to the radio reflection (shield) factor at a peak of the largest spectrum out of the radio reflection (shielding) spectrums of the radio shielding partitioning plane material is 50 % or lower (difference between the radio reflection (shield) factor at the peak of the largest spectrum and the minimum radio reflection (shield) factor at a valley is 3 dB or larger).

[0132] In Modified Example 6, the first to third antennas 22a to 22c are T-Y-shape antennas similar to those in the above embodiments, but each of them may be a Y-shaped antenna, a generally-called Jerusalem cross-shaped antenna, or the like. Alternatively, the first to third antennas 22a to 22c may be antennas in shapes different from or analogous with each other.

[0133] Arrangement of the antennas 22a to 22c in Modified Example 6 will be described next further in detail.

[0134] In the radio shielding layer 12f, the first antennas 22a, the second antennas 22b, and the third antennas 22c are arranged alternately and two-dimensionally in one direction in this order to form a plurality of antenna rows 23. In other words, the radio shielding layer 12f is composed of a plurality of antenna rows 23 arranged in parallel to each other and each formed of the first to third antennas 22a to 22c arranged alternately in this order in one direction.

[0135] In the radio shielding layer 12f, each first antenna 22a is adjacent to second antennas 22b and third antennas 22c belonging to antenna rows 23 adjacent to an antenna row 23 to which the associated first antenna 22a belongs. Similarly, each second antenna 22b is adjacent to first antennas 22a and third antennas 22c belonging to antenna rows 23 adjacent to an antenna row 23 to which the associated second antenna 22b belongs. Each third antenna 22c is adjacent to first antennas 22a and second antennas 22b belonging to antenna rows 23 adjacent to an antenna row 23 to which the associated third antenna 22c belongs. In other words, a triangle (preferably a regular triangular) is formed by the antenna centers of a first antenna 22a and those of adjacent first antennas 22a belonging to antenna rows 23 on the respective sides of an antenna row 23 to which the first antenna 22a belongs. Further, a triangle (preferably a regular triangular) is formed by the antenna centers of a second antenna 22b and those of adjacent second antennas 22b belonging to antenna rows 23 on the respective sides of an antenna row 23 to which the second antenna 22b belongs. As well, a triangle (preferably a regular triangular) is formed by the antenna centers of a third antenna 22c and those of adjacent third antennas 22c belonging to antenna rows 23 on the respective sides of an antenna row 23 to which the third antenna 22c belongs.

[01361 With the above arrangement, the plurality of antenna rows 23 can be arranged in rows (transversely) closely so that, for example, the second element part of a first antenna 22a gets in between a second antenna 22b and a third antenna 22c belonging to an adjacent antenna row. In other words, the second element parts of three second antennas 22b, which are the most close to a first antenna 22a, get into a region R where the first antenna 22a is arranged, as shown in FIG. 26. Thus, much amount of the antennas 22a, 22b, 22c can be disposed closely per unit area.

[0137] The radio shield factor correlates to the number of antennas 22 per unit area, and namely, an increase in the number of antennas 22 per unit area increases the radio shield factor. Accordingly, the arrangement of the antennas 22 in Modified Example 6 attains a further higher radio shield factor. Further, the numbers of the first to third antennas 22a to 22c per unit area can be set approximately equal to each other to suppress radio shielding irregularity in a target frequency band. With a view to further increasing the number of antennas 22a to 22c per unit area, the second element parts are preferably shorter than the first element parts (L2 > Li).

[0138] In the arrangement of the antennas 22a to 22c in Modified Example 6, the second 37 elements are opposed not in parallel to each other. This keeps the frequency selectivity of the antennas 22 comparatively low. In other words, the fractional bandwidth of which radio waves the radio shielding layer 12 is to shield can be kept comparatively wide.

Hence, a less biased high radio shield factor against radio waves in an entire specified frequency band can be attained.

[0139] (Modified Example 7) Heretofore, the radio shielding layers 12 of T-Y-shaped antennas (the antennas 13, 16, 17) have been described. The radio shielding layer 12 may be composed of antennas other than such T-Y-shaped antennas. For example, as shown in FIG. 28, it may be composed of a plurality of Y-shaped antennas 24. The antennas may be arranged in matrix. The Y-shaped antennas 24 each include three linear first element parts 24a radially extending from the antenna center to form angles of 120 degrees and having substantially the same length.

[01401 (Modified Example 8) Modified Example 8 is a modification of Modified Example 7. While the radio shielding layer 12g in Modified Example 7 is composed of only one kind of antennas 24, the radio shielding layer 12h is composed of two kinds of Y-shaped antennas 25, 26 different in size from each other in Modified Example 8. With this arrangement, a radio shielding partitioning plane material can be realized which is capable of shielding plural kinds of radio waves of which frequencies are different from each other.

[0141] As shown in FIG. 29, in Modified Example 8, comparatively large antennas 25 are arranged so that the first element parts thereof are opposed to each other. Specifically, the three first element parts of an antenna 25 are closely opposed to the first element parts of antennas 25 different from each other and in parallel with each other. In each hexagonal region defied and formed by the comparatively large antennas 25, one comparatively small antenna 24 is arranged. With this arrangement, the radio shield factor of the antennas 25 against a radio wave at a specified frequency increases.

[0142] (Modified Example 9) FIG. 30 is a plan view of the radio shielding layer 121 in accordance with Modified

Example 9.

[0143] In Modified Example 9, the radio shielding layer 12i is composed of a plurality of generally-called Jerusalem cross-shaped antennas 27. Each antenna 27 includes four linear first element parts 27a extending radially from the antenna center to form angles of degrees and having substantially the same length and a linear second element part 27b connected to the outer end of each first element part at a predetermined angle (typically, perpendicularly). This radio shielding layer 121 of the antennas 27 attains frequency selectivity higher than the radio shielding layers of the Y-shaped antennas as described in Modified Examples 7 and 8, wherein the frequency selectivity thereof is lower than that of a radio shielding layer of generally called T-Y-shaped antennas.

[0144] The antennas 27 are arranged in matrix so that the second element parts 27b of adjacent antennas 27 are opposed to each other (more preferably, in parallel with each other closely). With this arrangement, the radio shield factor of the antennas 27 against a radio wave at a specified frequency can be increased further.

[0145] (Modified Example 10) FIG. 31 is a plan view of the radio shielding layer 12j in accordance with Modified

Example 10.

[0146] Modified Example 10 is a modification of Modified Example 9. While only one kind of antennas 27 compose the radio shielding layer 12i in Modified Example 9, the reflection layer 12j is composed of two kinds of Jerusalem cross-shaped antennas 28, 29 different in size from each other in Modified Example 10. With this arrangement, a radio shielding partitioning plane material can be attained which is capable of shielding plural kinds of radio waves of which frequencies are different from each other.

[01471 As shown in FIG. 31, in Modified Example 10, the antennas 28 are arranged in matrix so that the second element parts 28b of adjacent antennas 28 are opposed to each other (preferably, in parallel to with each other closely). In each square region defined and formed by comparatively large antennas 28, one comparatively small antenna 29 is arranged.

[0148] With this arrangement, the radio shield factor of the antennas 28 against radio waves at specified frequencies increases further.

[0149] (Modified Example 11) FIG. 32 is a plan view of the radio shielding layer 12k in accordance with

Modified Example 11.

[0150] Modified Example 11 is a modification of Modified Example 10, of which difference from Modified Example 10 is only arrangement of the antennas 28, 29.

[0151] In Modified Example 11, rows of antennas 28 and rows of antennas 29 are arranged vertically alternately in FIG. 32, wherein each row of the antennas 28 is an arrangement in which second element parts 28b of the transversely adjacent antennas 28 are opposed to each other (preferably, in parallel with each other closely) while each row of the antennas 29 is an arrangement in which second element parts 29b of transversely adjacent antennas 29 are opposed to each other (preferably, in parallel with each other closely). This increases the radio shield factors of the antennas 28 and 29 against radio waves at respective specified frequencies.

[0152] (Modified Example 12) FIG. 33 presents plan views of an antenna 13 in Modified Example 12.

Specifically, FIG. 33(a) is a plan view showing the entirety of the antenna 13 in Modified Example 12, FIG. 33(b) is a plan view showing, in an enlarged scale, a part (in the vicinity of the antenna center C) denoted by b in FIG. 33(a), and FIG. 33(c) is a plan view showing, in an enlarged scale, a part denoted by c in FIG. 33(a).

[0153] The above embodiments and modified examples refer to the antennas 13 formed of a metal film (a metal foil) having no opening part, but the antennas 13 may be formed of a metal film or metal foil having an opening part (for example, a mesh-like metal film or metal foil, or the like), as shown in FIG. 33.

[0154] Herein, the metal film (the metal foil) having the opening part means any of a metal film (a metal foil) formed into a mesh-like shape in plan of a lattice in plan (a triangular lattice, a hexagonal lattice, a Collins lattice, or the like), a metal film (a metal foil) in which pores in circular, elliptic, or polygonal shape in plan are formed, and numeral metal films (metal foils) in a circular, elliptic, or polygonal shape in plan arranged with a space left from each other.

[0155] With the above arrangement, the antennas 13 can transmit light to some extent to be less visible. Accordingly, in the case where the radio shielding partitioning plane material is transparent, a transparent base material 10 results in a radio shielding partitioning plane material which less obstructs persons' view. Alternatively, in the case where the surface of the radio shielding portioning face is patterned, blurry contours of the pattern and lowered viewability, which are caused due to the presence of the antennas 13, can be suppressed.

[0156] With a view to attaining both transparency (to be less invisible) and conductivity (radio shielding characteristics) of the antennas 13, it is especially preferable, as shown in FIG. 33(a) and FIG. 33(b), that a part where the tree element parts 13a meet is formed of a mesh-like metal film or metal foil in a triangular lattice shape in plan and the other part of each first element part 13a and each second element part 13b are formed of mesh-like metal films or metal foils in a square lattice shape in plan.

[0157] In the above view, the area ratio of the metal film (a metal foil) to each antenna 13 is preferable in the r ange between 2.5 % and 30 %, both inclusive.

[0158] In the case where the metal film (the metal foil) of each antenna 13 is in a mesh shape in plan, the line width W and the pitch P shown in FIG. 33(c) can be determined appropriately according to the relationship between the conductivity (the radio shielding characteristics) and the aperture ratio (the transparency). For example, the line width W can be set in the range between 5 tm and 70 urn, both inclusive (5 pm S W 70 pm), preferably, in the range between 8 pm and 30 pm, both inclusive (8 pm ( W S 30 pm).

The line width W smaller than 5 pm (W < 5 pm) invites difficulty in obtaining necessary conductivity (radio shielding characteristics). While, it larger than 70 pm (W> 70 pm) attains an insufficient aperture ratio (transparency).

[0159] On the other hand, the pitch P may be set in the range between 50 p.m and 400 pm, both inclusive (50 pm S P S 400 pm), preferably, in the range between 100 pm and 300 pm, both inclusive (100 p.m S P 300 pm). The pitch P smaller than 50 pm (P < 50 pm) attains an insufficient aperture ratio (transparency). While, it larger than 400 pm (P> 400 pm) invites difficulty in obtaining necessary conductivity (radio shielding characteristics).

[0160] (Modified Example 13) FIG. 34 to FIG. 37 show radio shielding partitioning plane materials and radio shielding layers in Modified Example 13. In Modified Example 13, the radio shielding layer 12 is formed on a base material 60 including an air permeable carrier 60a to form a radio shielding sheet. The radio shielding sheet is attached to the plane main body 11 by means of an adhesive 61 or the like so that the radio shielding layer 12 is arranged on the plane main body 11. The radio shielding sheet is long and wound in a roll shape so as to be fed and cut into a needed length for use.

[0161] For attaching the radio shielding sheet to the plane main body 11, a face of the radio shielding sheet which is opposite to the radio shielding layer 12 may be overlaid with the plane main body 11, as shown in FIG. 34. In this case, as shown in FIG. 35, the adhesive 61 is coated in layers on a face of the base member 60 which is opposite to the radio shielding layer 12 of the radio shielding sheet (lower side in FIG. 35). To the surface of the layered adhesive 61, a protection film 62, which will be removed for attaching the radio shielding sheet to the plane main body 11, is attached. Alternatively, as shown in FIG. 37, in the case where the face of the radio shielding layer 12 of the radio shielding sheet is overlaid with the plane main body 11, the adhesive 61 is coated in layers on a face on the radio shielding layer 12 side (lower side in FIG. 37) of the base material and the protection film 62 is attached to the surface of the adhesive 61, similarly to the above case.

[0162] In Modified Example 13, a coating film 60b is formed on the entirety of one of the surfaces of the carrier 60a. The carrier 60a and the coating film 60b form the base material 60.

[0163] The coating film 60b, which reduces the air permeability of the carrier 60a, is formed on at least a part of the carrier 60a. Accordingly, a part of the base material 60 in which the coating film 60b is formed has less air permeability.

[0164] The carrier 60a may be made of cloth, such as fabric (for example, plain weave or the like), non-woven fabric, knit, race, felt, paper, or the like and has a plate shape, a sheet shape, a film shape, or the like.

[0165] The coating film 60b is not limited specifically as long as it can suppress the air permeability of the carrier 60a. For example, the coating film 60b is preferably made of an organic (high polymer) material, such as resin, rubber, or the like, or an inorganic material, such as glass, or the like. To any of the materials, an additive (an age inhibitor, a colorant, or the like) may be blended within a range not inviting lowering of the radio shielding characteristics. In the case where the carrier 60a is transparent, the coating film 60b is preferably transparent (has light transmissivity). The coating film 60b may be provided only in a region where the radio shielding layer 12 is formed or only a region where the antennas 13 are arranged.

[0166] With reference to FIG. 38, a method for manufacturing the above radio shielding sheet will be described next. FIG. 38 is a side view showing a step of forming the plural antennas 13 (the radio shielding layer 12) on the base material 60.

[0167] First, the flexible and air permeable carrier 60a of, for example, cloth or the like is prepared. The coating film 60b is formed on one of the surfaces of the carrier 60a to complete the base material 60. Since the coating film 60b is provided for reducing the air permeability of the carrier 60a, and therefore, the thus obtained base material 60 has less air permeability. The base material 60 may have substantially no air permeability. Then, as shown in FIG. 38, the base material 60 is spread and placed on a suction bed 40. The suction bed 40 has a flat and smooth surface in which one ends of a plurality of air holes 41 are opened. The other ends of the air holes 41 are connected to suction means (not shown, for example, a (vacuum) pump or the like). When the suction means is driven, the base material 60 placed on the suction bed 40 is sucked and held on the suction bed 40, so that the surface of the base material 60 on which each antenna 13 (the radio shielding layer 12) is to be formed becomes flat, namely, the base material 60 is held with no wrinlde and slack formed. Next, the radio shielding layer 12 of the plural antennas 13 are formed on the base material 60 in this state to obtain the radio shielding sheet. Thereafter, the thus obtained radio shielding sheet is attached to the plane main body 11 with the adhesive 61 to complete the radio shielding partitioning plane material. The step of forming the coating film 60b and the step of forming the radio shielding layer 12 may be carried out continuously. Alternatively, the formed coating film 60b may be once wound in a roll shape for storage, and then, the radio shielding layer 12 may be formed later.

[0168] In order to form plural antennas having highly accurate shape and dimension, it is necessary to hold the base material 60 so that the surface on which the plural antennas are to be formed is flat, in other words, so that none of a wrinide, a slack, and a curve are formed. In the case where the plural antennas 13 are directly formed on the air permeable carrier 60a, it is difficult to hold the base material 60 so that the surface thereof is flat (with neither a wrinide nor a slack formed) because of the air permeability of the carrier 60a.

For example, if the carrier 60a including no coating film 60a is placed on the suction bed for suction, it is difficult to suck and hold the carrier sufficiently because of the air permeability of the carrier 60a. In turn, it is difficult to form the plural antennas 13 having highly accurate shape and dimension, thereby leading to difficulty in attaining increased radio shielding characteristics. In this case, the radio shielding layer 12 (each antenna 13) may have no radio shielding characteristics, for example.

[0169] In contrast, in Modified Example 13, the coating film 60a for reducing the air permeability of the carrier 60a is formed on the air permeable carrier 60a. Therefore, the base material 60 mainly formed of the air permeable carrier 60a can be securely held by suction. In other words, the base material 60 can be held with the surface, on which the plural antennas 13 are to be formed, kept flat. This enables formation of the plural antennas 13 having highly accurate shape and dimension. As a result, increased radio shielding characteristics can be realized.

[0170] The base material 60 may be held by means other than the suction means, for example, by an adhesive or the like. This involves, however, a complicated steps of attaching/detaching the base material 60. Particularly, when the base material 60 is held to be considerably flat, complication of the attaching/detaching steps increases and difficulty in operation also increases. For this reason, it becomes difficult to form the radio shielding sheet and in turn to manufacture the radio shielding partitioning plane material having increased radio shielding characteristics. In contrast, holding the base material 60 by suction is rather easy for holding the base material 60 so that the surface thereof is kept rather flat, when compared with the case of the base material 60 held by an adhesive or the like.

[0171] -Experimental Example -Herein, the radio shielding sheet of Modified Example 13 was manufactured and an experiment was carried out for examining the radio shielding characteristics (transmission loss) thereof, which will be described next.

[0172] First, the radio shielding sheet was manufacture with the use of the aforementioned suction bed 40 (see FIG. 38). Specifically, the coating film 60a was formed on the surface of the carrier 60a made of #0717-CU (beige; a product by Toyo Senka Kabushiki Kaisha) with urethane resin by roll coating, thereby obtaining the base material 60.

[0173] Next, the antennas 13 were formed on the coating film 60b by screen printing using a silver paste obtained by dispersing and mixing silver powder of 63 wt% into and with polyester rein. The antenna formation was carried out with the base material 60 sucked to and held by the suction bed 40. Less or no spreading of the silver paste was observed in the thus formed antennas 13. The lengths Li, L2 of the first element parts and the second element parts were set at 12.94 mm and 9.32 mm, respectively while each line width L3 of the first element parts and the second element parts was set at 1.58 mm.

[0174] The transmission loss of the thus obtained radio shielding sheet was measured with the use of a network analyzer, a product of Agilent Technologies Inc. [0175] As a comparative example, a radio shielding sheet was prepared by the same manner as in the above experimental example except that the coating film 60b of urethane resin was not formed, and the transmission loss thereof was measured likewise. In the comparative example, spreading of the silver paste from the thus formed antennas the was observed in the surface of the base material.

[0176] FIG. 39 is a graph showing each transmission loss in the experimental example and the comparative example.

[0177] As can be understood from FIG. 39, a high peak was observed around 2.4 GFIz in the experimental example. This proved that the radio shielding sheet of the experimental example exhibits comparatively high frequency selectivity. In contrast, the radio shielding sheet of the comparative example showed slightly high transmission loss around 2.4 GHz and indicated no peak-like peak. This proved that the radio shielding sheet of the comparative example has less or no frequency selectivity.

[0178] The reason why such high frequency selectivity was recognized in the experimental example might be that formation of the coating film 60b on the carrier 60a leads to sufficient suction and holding of the base material 60 to form less or no wrinkle and slack in the surface of the base material 60 in forming the antennas, thereby obtaining antennas 13 having highly accurate shape and dimension. In contrast, the reason why no or less frequency selectivity was recognized in the comparative example might be that the base material 60 without the coating film 60b was sucked and held insufficiently to form wrinkles and slacks in the surface of the base material 60 in forming the antennas, thereby obtaining antennas 13 having less accurate shape and dimension.

Industrial Applicability

[0179] As described above, the radio shielding partitioning plane material in accordance with the present invention is useful as a shutter, a curtain, a blind, a window, a partition, a rolling screen, a veil, and the like.

Claims

[1] A radio shielding partitioning plane material comprising: a plane main body for partitioning a space; and a radio shielding layer provided on a surface of the plane main body for shielding a radio wave.

[2] The radio shielding partitioning plane material of claim 1, wherein the radio shielding layer selectively shields radio waves in at least one specified frequency band.

[3] The radio shielding partitioning plane material of claim 1, wherein the radio shielding layer includes a plurality of antennas selectively reflecting radio waves in at least one specified frequency band.

[4] The radio shielding partitioning plane material of claim 3, wherein each of the antennas includes three linear first element parts extending radially from the center of an associated antenna to foim angels of approximately 120 degrees and having substantially the same length and a linear second element part connected to an outer end of each of the first element parts.

[5] The radio shielding partitioning plane material of claim 1, wherein the radio shielding layer is formed of a conductive film.

[6] The radio shielding partitioning plane material of any one of claims 1, 2, 3, 4, and 5, wherein the plane main body is one selected from the group consisting of a shutter, a curtain, a Roman shade, a blind, a window, a partition, a rolling screen, and a veil.

S

[7] The radio shielding portioning face of claim 3, further comprising: a base material which includes: an air permeable carrier; and a coating film formed on at least a part of a surface of the carrier, and which is attachably provided on the plane main body, wherein the radio shielding layer is formed on the base material to form a radio shielding sheet, and the radio shielding layer is arranged on the plane main body by attaching the radio shieJding sheet to the plane main body.

[8] The radio shielding partitioning plane material of claim 7, wherein the plurality of antennas are formed under a state in which the base material sucked and fixed to a bed.

[9] The radio shielding partitioning plane material of claim 7, wherein the carrier has flexibility.

[10] The radio shielding partitioning plane material of claim 7, wherein the carrier is made of cloth.

N

[11] The radio shielding partitioning plane material of claim 7, wherein the radio shielding layer is arranged on the coating film.

[12] The radio shielding partitioning plane material of claim 11, wherein the carrier has a non-flat surface, and the coating film is provided for flattening a surface of the base material on which the radio shielding layer is arranged.

[13] The radio shielding partitioning plane material of claim 7, wherein the coating film is made of resin.

[14] The radio shielding partitioning plane material of claim 7, wherein each of the plurality of antennas is made of a conductive material.

[15] The radio shielding partitioning plane material of claim 7, wherein each of the plurality of antennas is formed of a metal film or a metal foil in which at least one opening part is formed.

[16] A method for manufacturing the radio shielding partitioning plane material of claim 7, comprising the steps of: obtaining the base material by fonning the coating film on at least a part of the surface of the carrier; obtaining the radio shielding sheet by forming the plurality of antennas on the base material with the base material sucked and held by suction means; and attaching the radio shielding sheet to the plane main body.