WO2007148680A1 - 電磁波遮蔽材および電磁波吸収体 - Google Patents
電磁波遮蔽材および電磁波吸収体 Download PDFInfo
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- WO2007148680A1 WO2007148680A1 PCT/JP2007/062292 JP2007062292W WO2007148680A1 WO 2007148680 A1 WO2007148680 A1 WO 2007148680A1 JP 2007062292 W JP2007062292 W JP 2007062292W WO 2007148680 A1 WO2007148680 A1 WO 2007148680A1
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- Prior art keywords
- electromagnetic wave
- wave shielding
- shielding material
- frequency
- electromagnetic
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
- H01Q15/08—Refracting or diffracting devices, e.g. lens, prism formed of solid dielectric material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/14—Reflecting surfaces; Equivalent structures
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0073—Shielding materials
- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
- H05K9/0083—Electromagnetic shielding materials, e.g. EMI, RFI shielding comprising electro-conductive non-fibrous particles embedded in an electrically insulating supporting structure, e.g. powder, flakes, whiskers
Definitions
- the present invention relates to an electromagnetic wave shielding material and an electromagnetic wave absorber, and more particularly, to incombustibility and facilitation of electromagnetic wave shielding work.
- Patent Document 1 discloses that a building body is constructed using concrete mixed with an electromagnetic shielding material such as a metal mesh or ferrite.
- Patent Document 1 Japanese Patent Publication No. 6-99972 (Page 2, Figures 2 and 3)
- the present invention has been made in view of such a point, and its main purpose is to shield only electromagnetic waves in a specific frequency band when shielding electromagnetic waves between inside and outside a building. It is intended to be able to transmit electromagnetic waves of a frequency, and to be used in places where non-flammability is required as well as not requiring much labor for construction.
- a frequency selective surface (FSS "Frequency Selective Surface") is used as an electromagnetic shielding material on an incombustible surface material used as an interior / exterior material of a building. It was made so that it could be used on indoor and outdoor wall surfaces as an electromagnetic shielding material.
- the electromagnetic wave shielding material is provided on a non-flammable surface material and at least one surface of the non-flammable surface material, and each selectively selects an electromagnetic wave in a specific frequency band.
- a frequency selection layer in which a plurality of conductive portions formed so as to be shielded are arranged.
- non-combustible refers to what is evaluated as “non-combustible” by the non-combustible, quasi-incombustible, and flame-retardant tests specified in the Building Standards Act.
- a frequency selection layer can be arranged between at least some of the adjacent incombustible face materials.
- a frequency selection layer is arranged between two or more sets of non-combustible face materials, that is, when there are a plurality of frequency selection layers, the conductive portion of each frequency selection layer is connected to other than the frequency selection layer. It can be formed so as to selectively shield electromagnetic waves having a frequency band different from that of the conductive portion of the frequency selection layer.
- the non-combustible face material as described above, a foamed calcium carbonate board can be mentioned.
- the frequency selective layer on the incombustible face material it may be formed directly by printing or the like, or the frequency selective layer is formed on the film and the film is laminated on the incombustible face material. You may make it do.
- the frequency selection layer may be arranged on the non-combustible face material side of the film, or on the opposite side of the film from the non-combustible face material. Also good.
- Each of the conductive portions of the frequency selection layer includes three first element portions extending radially at a single point force, and each extending in a direction intersecting the corresponding first element portion and in the length direction. And a part of which has three second element parts coupled to the tip of the first element part.
- the frequency selection layer may be disposed directly on the non-combustible face material.
- the frequency selection layer is interposed between the base material and the frequency selection layer. Or indirectly on a nonflammable face.
- the dielectric constant ⁇ of the non-combustible face material can be set within the range of 1 ⁇ ⁇ 2.
- the thickness dimension ⁇ of the non-combustible face material is set to lmm ⁇ T ⁇ 100mm can be set.
- the non-combustible face material is used as an electromagnetic wave in the frequency selection layer. It can be arranged on the incident side.
- the frequency selection layer of the electromagnetic wave shielding material shields the electromagnetic wave by reflecting the electromagnetic wave in at least one frequency band. Is disposed on the electromagnetic wave incidence side of the frequency selection layer, and is disposed between the frequency selection layer and the resistance film, which reflects a part of the incident electromagnetic wave and allows the remainder to pass therethrough. In response to the reflected surface wave of the at least one predetermined frequency band reflected on the resistive film, the at least one predetermined surface reflected on the frequency selective layer It is possible to provide a dielectric layer provided so that the internally reflected wave in the frequency band has an opposite phase in the resistive film.
- FIG. 1 is a cross-sectional view schematically showing a configuration of an electromagnetic wave shielding board according to Embodiment 1 of the present invention.
- FIG. 2 is an overall view (a) and an enlarged cross-sectional view (b) of a main part showing a roll-shaped frequency selection sheet formed separately from the board body.
- FIG. 3 is a plan view showing antenna patterns in the frequency selection layer of the electromagnetic wave shielding board.
- FIG. 4 is an enlarged plan view showing one antenna.
- FIG. 5 is a characteristic diagram showing the relationship between frequency and transmission attenuation in an electromagnetic wave shielding board with a first element portion length of 10.6 mm.
- Fig. 6 is a graph showing the relationship between the length of the first element section of the antenna and the matching frequency. 'Gender map.
- FIG. 7 is a diagram corresponding to FIG. 3 and showing antenna patterns in the frequency selection layer of the electromagnetic wave shielding board according to Embodiment 2 of the present invention.
- FIG. 8 is an enlarged plan view showing two adjacent antennas.
- FIG. 9 is a view corresponding to FIG. 5 showing the relationship between the frequency and the transmission attenuation in the antenna.
- FIG. 10 is a plan view showing a pattern in which Jerusalem cross-shaped antennas are arranged in a matrix as Modification 1 of the present embodiment.
- FIG. 11 is a characteristic diagram showing the relationship between the frequency and the amount of transparent attenuation in Modification 1
- FIG. 12 is a plan view showing a pattern in which Y-shaped antennas are arranged in a matrix as Modification 2 of the present embodiment.
- FIG. 13 is a view corresponding to FIG. 11 and showing the relationship between the frequency and the amount of transparent attenuation in Modification 2.
- FIG. 14 is a characteristic diagram showing the relationship between frequency and transmission attenuation in Examples 1 to 5 of the experimental example.
- FIG. 15 is a characteristic diagram showing the relationship between (second element length Z first element length) and matching frequency in an experimental example.
- FIG. 16 is a diagram corresponding to FIG. 3 and shows two types of antenna patterns in the frequency selection layer of the electromagnetic wave shielding board according to Embodiment 3 of the present invention.
- FIG. 17 is a view corresponding to FIG.
- FIG. 18 is a characteristic diagram showing the relationship between frequency and transmission attenuation when the lengths of the first element portions of the two types of large and small antennas are 11.19 mm and 6.05 mm, respectively.
- FIG. 19 is a plan view showing a pattern in which two types of large and small Y-shaped antennas are arranged as a first modification of the present embodiment.
- FIG. 20 is a view corresponding to FIG. 19, showing a pattern in which two types of large and small Jerusalem cross antennas are arranged as a second modification of the present embodiment.
- FIG. 21 shows two types of large and small Jerusalem cross-type antennas as modified example 3 of the present embodiment.
- FIG. 20 is a view corresponding to FIG. 19 and showing another pattern in which na is arranged.
- FIG. 22 is a view corresponding to FIG. 2 showing two types of antenna patterns in the frequency selection layer of the electromagnetic wave shielding board according to Embodiment 4 of the present invention.
- FIG. 23 is an enlarged view corresponding to FIG. 10 showing two small antennas adjacent to each other.
- FIG. 24 is a view corresponding to FIG. 22, showing a modification of the fourth embodiment.
- FIG. 25 is a view corresponding to FIG. 1, schematically showing the overall configuration of the electromagnetic wave shielding board according to Embodiment 5 of the present invention.
- FIG. 26 is a view corresponding to FIG. 2, showing a roll-shaped frequency selection sheet formed separately from the board body.
- FIG. 27 is a diagram corresponding to FIG. 4 and showing the relationship between the length of the first element portion and the matching frequency.
- FIG. 28 is a view corresponding to FIG. 1, schematically showing the overall configuration of the electromagnetic wave shielding board according to Embodiment 6 of the present invention.
- FIG. 29 is a view corresponding to FIG. 1, showing a modification of the present embodiment.
- FIG. 30 is a view corresponding to FIG. 1, schematically showing the overall configuration of the electromagnetic wave shielding board according to Embodiment 7 of the present invention.
- FIG. 31 is a cross-sectional view schematically showing the overall configuration of the electromagnetic wave absorber according to Embodiment 8 of the present invention.
- FIG. 32 is a view corresponding to FIG. 31 schematically showing the overall configuration of the ⁇ 4 type electromagnetic wave absorber.
- FIG. 1 is a cross-sectional view schematically showing the overall configuration of an electromagnetic wave shielding board according to Embodiment 1 of the present invention.
- This electromagnetic wave shielding board is a single board that is a non-combustible lightweight plate-like foam. It is provided on the main body 1 and one surface of the board main body 1 and selectively shields electromagnetic waves in a specific frequency band with a plurality of regularly arranged antennas 4, 4,... And a frequency selection layer 2.
- the board body 1 described above is a lightweight product obtained by heating and foaming a composition comprising calcium carbonate and talc (hydrous silicate of magnesium) as an inorganic base material, a binding resin, and a foaming agent.
- a foamed calcium carbonate board the thickness dimension, about 5 to 20 mm, the density, be 0. 05-0. 2g / cm 3 order (more preferably, 0. 15 g / cm 3 or less) It is preferable.
- the electromagnetic wave shielding board is laminated by being attached to a mating material 10 such as a wall of a building or a ceiling.
- a mating material 10 such as a wall of a building or a ceiling.
- this board body 1 is interposed between the mating material 10 and the frequency selection layer 2.
- the role of the spacer layer is assumed to be such that the frequency selection layer 2 is prevented from being adversely affected by the counterpart material 10 to deteriorate the electromagnetic shielding characteristics.
- the dielectric constant ⁇ is set to fall within a range of 1 ⁇ ⁇ ⁇ 2.
- the dielectric constant ⁇ is preferably close to “1” even within the range.
- the thickness of board body 1 The law Tl is set so that lmm ⁇ Tl ⁇ 100mm. If the thickness dimension T1 is less than 1 mm (Tl ⁇ lmm), it cannot function as a spacer. Conversely, if the thickness dimension T1 exceeds 100 mm (Tl> 100 mm), it is worth the installation space. The effect as a spacer cannot be obtained.
- the merit is the function / function role as the lower limit value in terms of electromagnetic shielding characteristics, but 5mm (5mm ⁇ Tl) is more preferable.On the other hand, workability when installing electromagnetic shielding boards in buildings, etc. More preferably, the upper limit at is 30 mm (Tl ⁇ 30 mm).
- the board body 1 of the present embodiment can be obtained by slicing the foam obtained as described above.
- the mixing ratio of the inorganic base material is preferably 50/50 to 95Z5, and the average particle size is 50 to 300 m.
- binder resin include salt vinyl resin, EVA resin, and acrylic resin, which are used in the form of paste resin with an average particle size of 10 to 30 m. It is preferable to do.
- the content is preferably 10 to L00 parts by weight with respect to 100 parts by weight of the inorganic base material.
- foaming agents are not particularly limited as long as they are substances that decompose by heating to generate gas.
- foaming agents examples include organic foaming agents such as azodicarbonamide, azobisisobutylnitrile, dinitrosopentatetramine, Examples include p-toluenesulfur hydrazide, p, p, monooxybis (benzenesulfol hydrazide), sodium bicarbonate as an inorganic foaming agent, and salt ammonium.
- the content is 10
- the amount is preferably 10 to 120 parts by weight with respect to 0 part by weight of the inorganic base material.
- an electromagnetic wave shielding sheet 3 as shown in FIG. 2 is used to provide the frequency selection layer 2 on the board body 1.
- the electromagnetic wave shielding sheet 3 has a frequency selective layer 2 formed on a film substrate 3a, and an adhesive layer 3b and a release liner 3c are sequentially formed on the surface of the film substrate 3a opposite to the frequency selective layer 2. It is stacked and rolled into a roll. Then, a necessary length is cut, and the release liner 3c is peeled off and attached to the board body 1 so that the frequency selection layer 2 can be provided on the board body 1.
- the film substrate 3a is preferably a polymer film that can be easily formed into a thin roll and has excellent flexibility. In particular, the thickness is generally from ⁇ to 10 to 500 / ⁇ ⁇ , preferably from ⁇ to 30 to 150 / ⁇ ⁇ , more preferably from ⁇ to 50 to 120 ⁇ m.
- each antenna 4 is made of a conductive material and has conductivity, and the electromagnetic wave reflectance of the antenna 4 with respect to electromagnetic waves in a specific frequency band correlates with the conductivity of the antenna 4. That is, the higher the conductivity of the antenna 4 (the lower the electric resistance of the antenna 4), the higher the electromagnetic wave reflectance of the antenna 4. Therefore, by increasing the conductivity of the antenna 4, the electromagnetic wave reflectance of the antenna 4 with respect to electromagnetic waves in a specific frequency band can be increased.
- conductive materials examples include aluminum, silver, copper, gold, platinum, iron, carbon, graphite, indium tin oxide (ITO), indium zinc oxide (IZO), and mixtures or alloys thereof. It is done.
- the antenna 4 preferably contains any one of copper, aluminum, and silver. The reason is that copper, aluminum, and silver have relatively low electrical resistance among conductive materials and are inexpensive. Among the above conductive materials, silver is particularly preferable from the viewpoint of realizing higher electromagnetic shielding properties and lower costs.
- Each antenna 4 may include fine particles of a conductive material such as copper, aluminum, and silver.
- a conductive material such as copper, aluminum, and silver.
- a conductive material in which a powdery conductive material is contained in a binder. Apply the paste evenly so that a predetermined pattern is formed on the film substrate 3a. Can be obtained by subsequent drying. Specifically, after forming a predetermined pattern of the conductive paste, for example, by drying it in an atmosphere of 100 ° C or higher and 200 ° C or lower for 10 minutes or more and 5 hours or less. Antenna 4 can be obtained.
- a powdered conductive material for example, silver
- polyester resin for example, a powdered conductive material
- the content of the conductive material is preferably 40% by weight or more and 80% by weight or less, more preferably 50% by weight or more and 70% by weight or less. If the content of the conductive material is less than 40% by weight, the conductivity of the antenna 4 tends to decrease. On the other hand, when the content of the conductive material is more than 80% by weight, it tends to be difficult to uniformly disperse and mix it in the resin.
- the antenna 4 may be composed of a conductive film made of a conductive material and an antioxidant film covering the conductive film.
- the method of forming the antenna 4 is not limited to the above method, and may be formed by other methods.
- a conductive film for example, an aluminum film or a silver film
- a film forming method such as a vapor deposition method, a sputtering method, or a chemical vapor deposition method (CVD method).
- the pattern may be put into a predetermined shape by the Jung method.
- the antenna 4 can be formed by, for example, silk printing, pattern pressing, etching, sputtering, vapor deposition (for example, chemical vapor deposition (CVD)), mist coating, and mold fitting. It can also be performed by an embedding method.
- the thickness T of the antenna 4 is preferably 10 111 or more and 20 111 or less (10 111 ⁇ D ⁇ 20 111). In other words, if the thickness T of the antenna 4 is smaller than 10 m (T 10 m), the conductivity of the antenna 4 tends to decrease, while the thickness T of the antenna 4 is larger than 20 m. > 20 m), the formability of the antenna 4 tends to decrease.
- the antennas 4, 4,... are arranged in a matrix as shown in FIG. These antennas 4, 4,... Are arranged at a fixed interval so that adjacent antennas 4, 4 do not contact each other.
- Each antenna 4 has three first element portions 4a, 4a,... And three second element portions 4b, 4b,.
- the three first element portions 4a, 4a,... Extend radially from the antenna center C force, and are formed in a straight line having an angle of 120 ° with each other.
- Each second element portion 4b has a corresponding first element It extends linearly in a direction perpendicular to the ment part 4a, and is coupled to the outer end of the first element part 4a at the center in the length direction.
- the width W2 of! / Is the same (Wl W2).
- the first element portion length L1 and the second element portion length L2 may be different from each other (L1 ⁇ L2). In that case, 0 ⁇ L2 2 X 3 1/2 X
- the relational expression L1 is satisfied. That is, if L2 ⁇ 2 X 3 1/2 X L1, the adjacent second element parts 4b and 4b come into contact with each other, and a desired electromagnetic wave shielding effect cannot be obtained.
- the second element part length L2 is more than 0.5 times and less than twice the first element part length L1 (0.5 X L1 ⁇ L2). It is preferable that ⁇ 2 X L1), and more preferable is 0.75 times or more and 2 times or less (0.75 X L1 ⁇ L2 ⁇ 2 X L1).
- first and second element portion widths Wl and W2 may be different from each other (W1 ⁇ W2).
- first and second element portions 4a and 4b can be crossed at an angle other than a force of 90 ° so as to be orthogonal to each other.
- the coupling position of the second element part 4b with respect to the first element part 4a may be a position other than the center in the length direction of the second element part 4b.
- the lengths LI and L2 of the first and second element portions 4a and 4b of the antenna 4 correlate with the frequency band (specific frequency band) of the electromagnetic wave reflected by the antenna 4.
- the length L1 of the first element part 4a and the length L2 of the second element part 4b can be appropriately determined according to the frequency band of the electromagnetic wave to be shielded by the electromagnetic shielding board.
- the specific frequency band can be lowered.
- the specific frequency band can be increased by shortening the element length L.
- the electromagnetic wave shielding characteristics of the electromagnetic wave shielding board by the lengths LI and L2 of the first and second element parts 4a and 4b will be described in detail.
- the antenna 4 in the frequency selection layer 2 of the electromagnetic wave shielding board selectively reflects an electromagnetic wave having a frequency of approximately 2.7 GHz out of incident electromagnetic waves having various frequencies.
- the transmission attenuation is measured using a “network analyzer” manufactured by Agilent, USA.
- FIG. 6 shows the relationship between the length L 1 of the first element portion 4 a of the antenna 4 and the frequency of the electromagnetic wave reflected by the antenna 4.
- the longer the element length L the longer the wavelength of the electromagnetic wave reflected by the antenna 4. Therefore, the shorter the element length L, the higher the frequency of the electromagnetic wave reflected by the antenna 4 (the shorter the wavelength).
- the frequency of the reflected electromagnetic wave does not greatly correlate with the respective widths W1 and W2 of the first and second element portions 4a and 4b.
- the frequency of the reflected electromagnetic wave is mainly determined by the element length L. Therefore, based on the characteristic diagram of the figure, it is possible to obtain an appropriate element length L in the electromagnetic wave frequency band (specific frequency band) force reflected by the antenna 4. For example, in order to shield electromagnetic waves having a frequency of about 5 GHz, it is understood that the length L1 of the first element part 4a should be set to L1 6 mm.
- the specific frequency band can also be adjusted by changing only L2, in other words, by changing the ratio of the second element length L2 to the first element length L1 (L2ZL1). Is possible. Specifically, the specific frequency band can be lowered by increasing the length L2 of the second element portion 4b, while the specific frequency band can be reduced by shortening the length L2 of the second element portion 4b. Can be high.
- the first element portion The specific frequency band can be adjusted only by changing the length LI.
- the specific circumference can also be obtained by changing both the length L1 of the first element portion 4a and the length L2 of the second element portion 4b.
- the specific frequency band can be adjusted by changing the ratio of the second element length L2 to the first element length L1 (L2ZL1).
- the electromagnetic wave shielding board is provided on the board body 1 made of lightweight foamed calcium carbonate and on one surface of the board body 1, and is regularly arranged.
- a plurality of antennas 4, 4,... are provided with a frequency selection layer 2 that selectively shields electromagnetic waves in a specific frequency band, thereby deteriorating the electromagnetic wave environment of equipment that uses electromagnetic waves outside the specific frequency band. It is not necessary to establish an electrical ground when performing the work to shield the electromagnetic wave and prevent leakage without incurring any damage, and because the board body 1 is lightweight, there is no need for trouble. Since it has nonflammability, it can also be used in areas where nonflammability is required.
- the board body 1 is made to have a lightweight foamed calcium carbonate power.
- an incombustible inner wall material flooring material is used.
- a flat or curved surface material having a two-dimensional flat or curved surface such as a ceiling material, an outer wall material, or a roof material, may be used.
- examples of the material include polytetrafluoroethylene, PE cube, silk, ivory, paper, etc. in addition to the above calcium carbonate and talc. Is mentioned.
- FIG. 7 shows an arrangement of the antennas 4, 4,... In the frequency selection layer 2 of the electromagnetic wave shielding board according to Embodiment 2 of the present invention.
- the same parts as those in Embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted.
- each pair of two adjacent antennas 4 and 4 has a pair of second element portions 4b and 4b facing each other in parallel as shown in an enlarged view in FIG.
- the antenna unit 5a is formed so as to be close to each other.
- Sarasako three adjacent Anne The tena units 5a, 5a,... are arranged in a two-dimensional continuous hexagonal antenna assembly 5 in which the corresponding three sets of second element portions 4b, 4b are arranged close to each other so as to face each other in parallel.
- Array unit the antenna assembly 5 is composed of six antennas 4 arranged in a regular hexagonal shape in which the six corresponding second element portions 4b, 4b face each other in parallel. Since the antenna assembly 5 has a regular hexagonal shape, it can exhibit a relatively stable electromagnetic wave shielding performance against electromagnetic waves incident at various incident angles.
- the six antennas 4 constituting the antenna assembly 5 correspond to the 12 second element parts 4b out of the 18 second element parts 4b of the six antennas 4. Since the 6 sets of the second element parts 4b, 4b are arranged close to each other, the antennas 4 can be arranged with high density, and as a result, the electromagnetic wave reflectivity for electromagnetic waves in a specific frequency band. (Electromagnetic wave shielding rate) can be further improved, and an electromagnetic wave shielding board having a high electromagnetic wave shielding rate against electromagnetic waves in a specific frequency band can be realized.
- the distance X between the second element portions 4b and 4b is preferably 3. Omm or less (X ⁇ 3. Omm). In other words, when the distance X is larger than 3. Omm (X> 3 Omm), the electromagnetic wave shielding rate tends to decrease. If the distance X is too small, the second element portions 4b and 4b may easily come into undesired contact depending on the method of forming the antenna 4. Therefore, the distance X is limited to 0.05 mm or more (X ⁇ 0. 05 mm). It is preferable to keep it.
- the electromagnetic wave shielding board configured as described above has a relatively high frequency selectivity.
- FIG. 9 is a characteristic diagram showing the electromagnetic wave shielding characteristics of the electromagnetic wave shielding board according to the present embodiment.
- the ratio of the 10 dB bandwidth to the matching frequency F0 [ ⁇ (F2-F1) ZF0 ⁇ X 100 (%)] is very small, 10.4%. .
- the frequency selectivity is very high.
- the antennas 104, 104,... Having a so-called Jerusalem cross shape for example, as in Modification 1 shown in FIG. 10, the electromagnetic wave shielding characteristics are matched as shown in FIG.
- the ratio of 10 dB bandwidth to frequency is 17.0% (> 10.4%), which is larger than in the present embodiment.
- the electromagnetic wave shielding characteristics are as follows. As shown in FIG. 13, the ratio of the 10 dB bandwidth to the matching frequency is 33.0%. (> 10.4%), which is even greater than in the present embodiment. In the above three characteristic diagrams (Figs. 9, 11, and 13), the matching frequency F0 is different from each other, but the 10dB bandwidth is not dependent on the matching frequency, so there is no particular problem in comparison.
- the arrangement distance (vertical / horizontal distance) of Comparative Example 2 is the same as that of Comparative Example 1.
- the 10 dB bandwidth is narrow (high frequency selectivity). It is difficult to invite the bad effects of the electromagnetic environment!
- Example 1 a silver paste was applied on the board body 1 and dried to form five types of antennas of Examples 1 to 4 and Comparative Example, respectively.
- Examples 1 to 4 having the second element portion 4b the electromagnetic wave shielding rate was higher than that in Example 5. From these results, it can be seen that in Examples 1 to 4, electromagnetic waves in a specific frequency band can be shielded with a higher electromagnetic wave shielding rate than in Example 5. I understand. In addition, Examples 1 to 4 have sharper peaks than those in Example 5. That is, it can also be seen that in the cases of Examples 1 to 4, electromagnetic waves in a specific frequency band with higher frequency selectivity than in Example 5 are shielded with higher selectivity.
- the matching frequency force S tends to decrease as the ratio (L2ZL1) between the first element portion length L1 and the second element portion length L2 increases. From this, it is understood that the matching frequency can be adjusted by changing the length L2 of the second element portion 4b.
- FIG. 16 shows an antenna arrangement in the frequency selection layer 2 of the electromagnetic wave shielding board according to Embodiment 3 of the present invention.
- the frequency selection layer 2 shields electromagnetic waves in two different frequency bands. It has two types of antennas 4 and 6 that are large and small. Since the large antenna 4 has substantially the same size and shape as the antenna 4 of the first embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the frequency selection layer 2 includes a plurality of large antennas 4, 4,... And a plurality of small antennas 6, 6,... Arranged in a matrix so as to form a fixed pattern. I have.
- the large antennas 4, 4,... And the small antennas 6, 6,... Are arranged at regular intervals so as not to interfere with each other.
- the small antenna 6 is similar to the large antenna 4 and differs from the large antenna 4 only in size. Specifically, as shown in an enlarged view in FIG. 17, the small antenna 6 has three first element portions 6a, 6a,... And three second element portions 6b as in the case of the large antenna 4. , 6b,.
- the three first element portions 6a, 6a,... Extend radially from the antenna center Cs and form an angle of 120 ° with each other.
- Each second element portion 6b extends linearly in a direction perpendicular to the corresponding first element portion 6a, and is coupled to the outer end of the first element portion 6a at the center in the length direction.
- the first element length Lsl and the second element length Ls2 may be different from each other (Lsl ⁇ Ls2). In this case, 0 ⁇ Ls2 ⁇ 2 X 3 1/2 X The relational expression Lsl is satisfied.
- the second element part length Ls2 is 0.5 times or more and less than 2 times the first element part length Lsl (0.5 X Lsl ⁇ It is more preferable that Ls2 ⁇ 2 X Lsl) is more than 0.75 times and less than 2 times (0.75 X Lsl ⁇ Ls2 ⁇ 2 X Lsl). Further, the widths Wsl and W2 of the first and second element portions 6a and 6b may be different from each other (Wsl ⁇ Ws2).
- first and second element portions 6a and 6b may be crossed at an angle other than the force 90 ° that is orthogonal to each other. Further, the coupling position of the second element part 6b with respect to the first element part 6a may be a position other than the center in the length direction of the second element part 6b.
- the antenna of the frequency selection layer 2 in this embodiment has only two types of antennas, the large antenna 4 and the small antenna 6.
- the antenna has a shape or size different from that of the large antenna 4 and the small antenna 6. You may do it.
- the frequency selection layer 2 may be configured by three or more types of antennas having different sizes.
- Each of the large antenna 4 and the small antenna 6 has frequency selectivity. Specifically, the large antenna 4 reflects electromagnetic waves in the first frequency band, and the small antenna 6 reflects electromagnetic waves in the second frequency band (> first frequency band) higher than the first frequency band. For this reason, the electromagnetic wave shielding board according to the present embodiment selectively shields both electromagnetic waves in the first frequency band and the second frequency band, and transmits electromagnetic waves of other frequencies.
- electromagnetic waves of two frequency bands of 2.45 GHz band and 5.2 GHz band are used.
- the two frequency bands used are While selectively blocking only electromagnetic waves to prevent information leakage, electromagnetic waves of other frequencies that are not used (for example, radio waves used for mobile phones and TV broadcasts) should be transmitted.
- An electromagnetic shielding board is required.
- the electromagnetic wave shielding board according to the present embodiment is preferable because it can selectively shield electromagnetic waves of two specific frequency bands and transmit electromagnetic waves of other frequencies.
- FIG. 18 shows the relationship between the frequency of the electromagnetic wave incident on the electromagnetic wave shielding board and the transmission attenuation when the electromagnetic wave passes through the electromagnetic wave shielding board.
- electromagnetic waves in two frequency bands among electromagnetic waves incident on the electromagnetic wave shielding board specifically, 2.45 GHz band radio waves and 5.2 GHz band radio waves are Attenuated.
- the electromagnetic wave incident on the electromagnetic wave shielding board is selectively shielded by the two electromagnetic wave shielding boards of 2.45 GHz band and 5.2 GHz band.
- the large antenna 4 reflects radio waves in the low first frequency band (2.45 GHz band)
- the small antenna 6 reflects radio waves in the high second frequency band (5.2 GHz band).
- the small antennas 206, 206 have fewer units per unit area than the large antennas 204, 204, ... Inevitably, it is difficult to arrange with high density. Therefore, the small antennas 206, 206,.
- the shielding rate against magnetic waves is much lower than the shielding rate against electromagnetic waves targeted by the large antennas 204, 204,.
- the large antennas 104, 104,... are arranged close to each other in a matrix in a state where the second element portions 104b, 104b face each other in parallel. , / J, and antennas 106, 106, ..., the second element ⁇ 106b, 106b faces each other in parallel, and it is difficult to place the small antennas 106, 106 close together.
- 104, 104, ... can be arranged at high density, but small antennas 106, 106, ... must be arranged at a high density because the number of units per unit area must be smaller than that of large antenna 104.
- the arrangement of the large and small antennas 104 and 106 For electromagnetic waves of a specific frequency that enter along a direction that intersects the direction (for example, the vertical direction in the figure), adjacent large antennas 104 and 104 and small antennas 106 and 106 are separated from each other in the same direction. As a result, the electromagnetic wave shielding rate is lowered, and the incident angle dependency problem that the electromagnetic wave shielding rate greatly changes depending on the incident direction of the electromagnetic wave is caused.
- the two types of large and small antennas 4 and 6 can be arranged at high density, and electromagnetic waves in the two frequency bands can be at the same level.
- electromagnetic waves in the two frequency bands can be at the same level.
- a high electromagnetic wave shielding rate for example, in the case of a wireless LAN environment that uses radio waves in two frequency bands of 2.45 MHz band and 5.2 MHz band, Deteriorating the electromagnetic environment of mobile phones and other devices that use electromagnetic waves The leakage of the wireless LAN radio waves can be suppressed.
- FIG. 22 shows an arrangement of large antennas 4, 4,... And small antennas 6, 6,... In the frequency selection layer 2 of the electromagnetic wave shielding board according to Embodiment 4 of the present invention.
- the configurations of the large antenna 4 and the small antenna 6 are the same as those in the third embodiment, and therefore the same portions are denoted by the same reference numerals and description thereof is omitted.
- the arrangement of the large antennas 4 is the same regular hexagonal shape as in the second embodiment, and the two large antennas 4 arranged close to each other so that the second element portions 4b and 4b face each other in parallel. Four pairs form a large antenna unit 5a, and three large antenna units 5a, 5a,...
- Two large antenna assemblies 5 Arranged close to each other in a state where the corresponding two sets of second element portions 4b, 4b face each other in parallel are 1 Two large antenna assemblies 5 are formed.
- the adjacent large antenna assemblies 5 are arranged close to each other so that the corresponding second element portions 4b and 4b face each other in parallel. In this way, a large number of large antenna assemblies 5, 5 are arranged. , ... are continuously expanded in two dimensions.
- the small antennas 6 of the present embodiment are also arranged in the same manner as the large antennas 4, 4,. That is, the pair of the two small antennas 6 and 6 arranged in close proximity to each other so that the second element portions 6b and 6b face each other in parallel form a small antenna unit 7a. Two small antenna units 7a, 7a,... Arranged close to each other so that the two element portions 6b, 6b face each other in parallel constitute a small antenna assembly 7. However, the small antenna assembly 7 is placed inside the large antenna assembly 5 for each large antenna assembly 5. Are arranged one by one in a state of being separated from the small antenna assemblies 7, 7,. Exactly speaking, one small antenna assembly 7 is arranged inside each large antenna assembly 5 and one part surrounded by three adjacent large antenna assemblies 5, 5,. .
- the electromagnetic wave reflectance of the small antenna 6 increases as the small antennas 6 are arranged at a high density so that the distance between the opposing second element portions 6b and 6b is reduced.
- the distance Xs between the opposing second element portions 6b and 6b is preferably 3. Omm or less (Xs ⁇ 3. Omm).
- the range is 1. Omm or less (Xs ⁇ l. Omm). That is, when the distance Xs is larger than 3. Omm (Xs> 3 Omm), the electromagnetic wave shielding rate is too low.
- the second element parts 6b and 6b may easily come into contact with each other undesirably depending on the formation method of the small antennas 6, 6,..., 0.4 mm or more (Xs ⁇ 0.4 mm), and more safely, it is preferable to keep it at least 0.6 mm (X s ⁇ 0.6 mm).
- a large antenna assembly is provided as in the modification shown in FIG. 5 (Six large antennas arranged in the hexagonal shape 4, 4,...)
- the small antenna assembly 7 (six small antennas arranged in the hexagonal shape 6, 6,.
- the large antenna 4, 4,... are arranged in a state where the second element portions 4 b, 4 b face each other in parallel to form a regular hexagonal large antenna assembly 5, and inside each large antenna assembly 5, respectively.
- the six small antennas 6, 6,... Are arranged in a state where the second element parts 6b, 6b are parallel to each other and form a regular hexagonal small antenna assembly 7.
- the antennas 4, 4,... And the small antennas 6, 6,... can be arranged with high density, and therefore the electromagnetic wave shielding rate against the two types of electromagnetic waves can be further improved.
- the force that arranges the large antenna assembly 5 and the small antenna assembly 7 together is not closely arranged depending on the desired electromagnetic wave shielding rate.
- the number of antenna assemblies 5, 7 can be adjusted as appropriate.
- FIG. 25 schematically shows a cross section of the electromagnetic wave shielding board according to Embodiment 5 of the present invention.
- This embodiment is the same as in the case of Embodiment 1 in that the frequency selection layer 2 is provided on the board body 1 using the electromagnetic wave shielding sheet 3. Accordingly, the configuration of the electromagnetic wave shielding sheet 3 used for providing the frequency selection layer 2 is also different.
- the frequency selection layer 2 is located on the side opposite to the board body 1 (the upper side in FIG. 1), whereas in the present embodiment, the frequency selection layer 2 2 is located on the board body 1 side (the lower side in FIG. 25). That is, in the electromagnetic wave shielding sheet 3 of this embodiment, unlike the case of Embodiment 1, the frequency selection layer 2 is disposed on the same side as the adhesive layer 3b and the release liner 3c in the film substrate 3a, and On the frequency selection layer 2, an adhesive layer 3b and a release liner 3c are sequentially laminated.
- the frequency selective layer 2 Even when the frequency selective layer 2 is located on the board body 1 side as in the present embodiment, it can selectively reflect electromagnetic waves in a specific frequency band. However, compared to the case where the antenna 4 faces the atmosphere as in the first embodiment, even if the shape and material of the antenna 4 are the same, the electromagnetic wave reflected (shielded) by the antenna 4 is the same. The frequency band (specific frequency band) is different.
- FIG. 27 shows the relationship between the first element length L1 (1Z6 of element length L) of the antenna 4 and the matching frequency in the frequency selection layer 2 of the electromagnetic wave shielding board configured as described above. According to the figure, as can be seen in comparison with the case of Embodiment 1 (see FIG. 6), when the frequency selection layer 2 is covered by the board body 1, the frequency selection layer 2 faces the atmosphere. The frequency band of the electromagnetic wave reflected (shielded) by the frequency selective layer 2 is lower than that in the case where the frequency is selected.
- FIG. 28 is a cross-sectional view showing the configuration of the electromagnetic wave shielding board according to Embodiment 6 of the present invention.
- the electromagnetic wave shielding board includes a single frequency selection layer 2 and two board main bodies 1 having a spacer function as in the first embodiment. ing. Of these two board bodies 1, the frequency selection layer 2 is arranged on one side of one board body 1 using an electromagnetic wave shielding sheet (the same electromagnetic wave shielding sheet as in Embodiments 1 to 4). The other board body 1 is arranged on the surface of the frequency selection layer 2 opposite to the surface on the one board body 1 side.
- the electromagnetic wave shielding sheet includes an adhesive layer 3b on the frequency selective layer 2 side in addition to the adhesive layer 3b on the opposite side of the frequency selective layer 2 in the film substrate 3a.
- Each board body 1 is attached to the frequency selection layer 2 with a corresponding adhesive layer 3b.
- the thickness dimension T1 of the board body 1 on the side to be joined to the mating member 10 (the lower side in FIG. 28) is preferably set to such an extent that such influence can be suppressed to a practical level.
- the dielectric constant of the partner material 20 affects the shielding characteristics of the frequency selection layer 2.
- Other configurations are substantially the same as those in the first to fifth embodiments, and thus the description thereof is omitted.
- the present embodiment can provide the same effects as those of the first embodiment.
- the force board body 1 having a structure in which the two board bodies 1 and 1 are overlapped so as to be most easily manufactured has three or more board bodies 1, and the modification shown in FIG.
- the frequency selection layer 2 is divided into a plurality of layers (in the example shown, two layers are provided for three board bodies 1, 1,... It can be a frequency selective layer 2, 2).
- the thickness dimension T2 of the board body 1 located between the frequency selection layers 2 and 2 is such that the frequency selection layers 2 and 2 interfere with each other. It is preferable to set it to such an extent that the change of the shielding property due to is suppressed within a practical level. According to this modification, when the multiple frequency selection layers 2, 2,...
- the shielding rate against the electromagnetic waves can be increased, and they are different from each other.
- FIG. 30 is a cross-sectional view showing a configuration of an electromagnetic wave shielding board according to Embodiment 7 of the present invention.
- the electromagnetic wave shielding sheet is not used, and the frequency selection layer 2 (in practice, one or more types of antennas) is directly on the board body 1. Is formed.
- a powdery conductive material such as copper, aluminum, silver, and the like as in the case of Embodiment 1 is included in the binder. It is mentioned to use the conductive paste. That is, this conductive paste may be applied uniformly on the board body 1 so that a predetermined pattern is formed, and then dried. However, in this case as well, the thickness dimension T1 of the board body 1 is such that the adverse effect exerted on the characteristics of the frequency selection layer 2 by the dielectric constant of the mating material superimposed on the electromagnetic wave shielding board is suppressed to a practical level or less. It is preferable to set as a guideline. In addition, when the coated surface of the board body 1 is an uneven surface, it may be applied after polishing the uneven surface to eliminate the unevenness. Since other configurations are the same as those in the first to sixth embodiments, description thereof will be omitted.
- the board main body 1 is provided with the frequency selection layer 2.
- the frequency selection layer 2 Although not as convenient as in the case of Embodiments 1 to 6, in other respects, substantially the same effects can be achieved.
- FIG. 31 is a cross-sectional view schematically showing the overall configuration of the electromagnetic wave absorber according to Embodiment 8 of the present invention
- FIG. 32 schematically shows the overall configuration of the ⁇ Z4 type radio wave absorber as its basic configuration.
- the electromagnetic wave absorber reflects a part of the incident electromagnetic wave, while allowing the remaining part of the electromagnetic wave to pass through, and a side opposite to the electromagnetic wave incident side of the resistive film 30 (FIG. 31 and the frequency selection layer 2 as an electromagnetic wave reflection layer disposed on the right side of FIG. 32, and the predetermined frequency reflected between the resistance coating 30 and the frequency selection layer 2 disposed between the resistance coating 30 and the frequency selection layer 2.
- An air layer 12 as a dielectric layer provided so that the internal reflection wave of the predetermined frequency band reflected in the frequency selective layer 2 is opposite in phase to the surface reflection wave of the band in the resistive film 30; It is equipped with.
- the frequency selection layer 2 selects the electromagnetic waves in at least one frequency band including the electromagnetic waves in the predetermined frequency band with the antennas 4, 4, ... as a plurality of conductive parts.
- the electromagnetic wave is shielded by being reflected, while the electromagnetic wave outside the above frequency band is allowed to pass through.
- the resistance film 30 is made of a conductive film such as a film, and is formed on the base material 13 such as a polyethylene terephthalate (PET) film.
- the frequency selection layer 2 is formed on the board body 1 similar to that in the first embodiment. That is, the frequency selection layer 2 and the board body 1 correspond to the electromagnetic wave shielding materials of the first to seventh embodiments.
- the base material 13 and the board body 1 are arranged on the side opposite to the air layer 12 so as to protect the resistance film 30 and the frequency selection layer 2. Further, a spacer 15 that maintains the layer thickness D of the air layer 12 constant is disposed between the resistive film 30 and the frequency selective layer 2.
- the electromagnetic wave absorber according to the embodiment is generally referred to as a ⁇ 4 type electromagnetic wave absorber.
- a part of the incident electromagnetic wave is reflected on the surface of the resistive film 30, while the remainder of the electromagnetic wave passes through the resistive film 30 and has a frequency.
- electromagnetic waves in a predetermined frequency band are reflected by the frequency selective layer 2. Then, electromagnetic waves outside the predetermined frequency band pass through the frequency selection layer 2.
- the phase of the internal reflected wave is the same frequency band electromagnetic wave (surface) reflected on the surface of the resistive film 30.
- the surface reflected waves the surface reflected waves in a predetermined frequency band are canceled out by the internal reflected waves and become correspondingly smaller, and as a result, are absorbed by the electromagnetic wave absorber.
- electromagnetic waves other than the predetermined frequency band are transmitted through the frequency selection layer 2. Therefore, in the case of the conventional ⁇ ⁇ 4 type electromagnetic wave absorber, the electromagnetic waves other than the predetermined frequency band are contained together with the electromagnetic wave of the predetermined frequency band. Unlike reflecting, i.e., being shielded, it is not shielded.
- the resistance film 30 that reflects a part of the incident electromagnetic wave while allowing the remaining part of the electromagnetic wave to pass therethrough is opposite to the electromagnetic wave incident side of the resistance film 30.
- the frequency selection layer 2 that reflects the electromagnetic wave that has passed through the resistance film 30 and the resistance film 30 and the frequency selection layer 2 are arranged between the resistance film 30 and the frequency selection layer 2.
- a ⁇ ⁇ 4 type electromagnetic wave absorber which has a spacer 15 for forming and securing an air layer 12 having a thickness D of 1Z4 of the wavelength of the electromagnetic wave of the band, and is configured to absorb electromagnetic waves of a predetermined frequency band
- the frequency selection layer 2 a plurality of antennas 4, 4... Selectively reflect electromagnetic waves in a predetermined frequency band while allowing transmission of electromagnetic waves outside the predetermined frequency band. For electromagnetic waves outside the specified frequency band, Contrary to the conventional case for shielding these can transmit.
- the dielectric layer is formed by the air layer 12 having a layer thickness D of 1Z4, which is the wavelength of electromagnetic waves in a predetermined frequency band to be absorbed between the resistance film 30 and the frequency selective layer 2.
- D layer thickness
- the structure of the dielectric layer can be changed by a known technique if necessary. Surgery can be applied as appropriate.
- a resin layer, a ceramic layer, etc. can be applied to the dielectric layer.
- the frequency selection layer 2 is configured to reflect only electromagnetic waves in one frequency band. However, the frequency selective layer 2 reflects electromagnetic waves in a plurality of frequency bands including the one frequency band. It can also be crushed.
- a board body that is substantially the same as that in the case of the force frequency selection layer 2 that mentions a polyethylene terephthalate (PET) film or the like is used.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Building Environments (AREA)
Abstract
Description
Claims
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GB0900123.1A GB2460288B (en) | 2006-06-19 | 2007-06-19 | Electromagnetic shielding material and electromagnetic absorber |
KR1020087032059A KR101306249B1 (ko) | 2006-06-19 | 2007-06-19 | 전자파 차폐재 및 전자파 흡수체 |
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JP2006168352A JP2007335781A (ja) | 2006-06-19 | 2006-06-19 | 電磁波遮蔽材 |
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JP2006209723A JP5148081B2 (ja) | 2006-08-01 | 2006-08-01 | 電磁波遮蔽材 |
JP2006-209723 | 2006-08-01 | ||
JP2006-219335 | 2006-08-11 | ||
JP2006219335A JP2008047594A (ja) | 2006-08-11 | 2006-08-11 | 電波吸収体および電波遮蔽体 |
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CN112350066A (zh) * | 2020-10-28 | 2021-02-09 | 北京环境特性研究所 | 一种滤波结构及雷达天线罩 |
CN112350066B (zh) * | 2020-10-28 | 2023-05-16 | 北京环境特性研究所 | 一种滤波结构及雷达天线罩 |
Also Published As
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TWI431181B (zh) | 2014-03-21 |
GB0900123D0 (en) | 2009-02-11 |
GB2460288A (en) | 2009-11-25 |
GB2460288B (en) | 2012-02-22 |
KR20090031529A (ko) | 2009-03-26 |
TW200813300A (en) | 2008-03-16 |
KR101306249B1 (ko) | 2013-09-09 |
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