WO2023248882A1 - Composant diélectrique pour ondes électriques - Google Patents

Composant diélectrique pour ondes électriques Download PDF

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Publication number
WO2023248882A1
WO2023248882A1 PCT/JP2023/022023 JP2023022023W WO2023248882A1 WO 2023248882 A1 WO2023248882 A1 WO 2023248882A1 JP 2023022023 W JP2023022023 W JP 2023022023W WO 2023248882 A1 WO2023248882 A1 WO 2023248882A1
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WIPO (PCT)
Prior art keywords
coat layer
radio wave
region
reflection
dielectric
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PCT/JP2023/022023
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English (en)
Japanese (ja)
Inventor
裕太 岡西
遼 上杉
隆史 西宮
芳雄 青木
恭 白方
Original Assignee
日本電気硝子株式会社
株式会社ヨコオ
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Publication of WO2023248882A1 publication Critical patent/WO2023248882A1/fr

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    • 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

Definitions

  • Patent Document 1 discloses a dielectric lens (dielectric component for radio waves).
  • a dielectric component for radio waves includes a core material made of a dielectric material and having a first surface and a second surface facing each other, and a core material provided on the first surface. a first coat layer including one region, and a second coat layer provided on the first region and including a second region, and the relative dielectric constant of the core material is ⁇ c. , the dielectric constant of the first region is ⁇ 1, the dielectric constant of the second region is ⁇ 2, the thickness of the first region is t1, the thickness of the second region is t2, a dielectric component for radio waves.
  • the transmission center wavelength of is ⁇
  • the following formula (1), the following formula (2), and the following formula (3) ⁇ 2 ⁇ 1 ⁇ c...(1) 0.9 ⁇ /4 ⁇ ( ⁇ 1) ⁇ t1 ⁇ 1.1 ⁇ /4 (2) 0.9 ⁇ /4 ⁇ ( ⁇ 2) ⁇ t2 ⁇ 1.1 ⁇ /4 (3) It satisfies the following and transmits radio waves containing at least one of microwaves and millimeter waves.
  • the amount of reflection of radio waves can be reduced.
  • FIG. 1 is a schematic diagram of a radio repeater according to Embodiment 1 of the present disclosure.
  • FIG. 3 is a diagram illustrating the transmission of radio waves through a radio lens with respect to the dielectric loss tangent of the radio lens.
  • FIG. 2 is a cross-sectional view showing a schematic configuration of a radio wave dielectric component according to Embodiment 2 of the present disclosure. It is an explanatory diagram of ⁇ c, ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, tc, t1, t2, t3, and t4. It is a graph showing simulation results of reflection and transmission characteristics of ceramics (thickness 10 mm) with a dielectric constant of 12.
  • It is a graph showing the reflection and transmission characteristics of PTFE (thickness 3.3 mm) in the case of vertical incidence of radio waves. It is a graph showing the reflection and transmission characteristics of a glass plate having a dielectric constant of 5 and a thickness of 10 mm. 8 is a graph showing reflection and transmission characteristics of the glass plate of FIG. 7 with PTFE (relative dielectric constant ⁇ r 2.3, thickness 1.65 mm (corresponding to ⁇ a/4)) attached to both sides. It is a graph showing the characteristics of two layers of only the first coat layer. It is a graph showing the characteristics when the first coat layer and the second coat layer are stacked and there is no core material.
  • 1 is a graph showing reflection and transmission characteristics of a member including a first coat layer, a second coat layer, and a core material.
  • 10 is a graph showing reflection and transmission characteristics in the case of vertical incidence of radio waves when the thickness of the first coat layer is 1 mm with respect to the characteristics shown in FIG. 9. It is a graph showing the characteristics when a second coat layer and a first coat layer having a thickness of 1 mm are stacked. It is a graph showing reflection and transmission characteristics in the case of vertical incidence of radio waves when the first coat layer (relative dielectric constant 6.0, thickness 1.02 mm) is two layers.
  • 15 is a graph showing reflection and transmission characteristics in the case of vertical incidence of radio waves when a second coat layer is stacked on the first coat layer according to FIG. 14.
  • FIG. 16 is a graph showing reflection and transmission characteristics in the case of vertical incidence of radio waves when the core material is sandwiched between the coating layers according to FIG. 15.
  • FIG. It is a graph showing the reflection and transmission characteristics in the case of vertical incidence of radio waves when the first coat layer (relative dielectric constant 10.8, thickness 0.77 mm) is two layers.
  • 18 is a graph showing reflection and transmission characteristics in the case of vertical incidence of radio waves when a second coat layer is stacked on the first coat layer according to FIG. 17.
  • FIG. 19 is a graph showing reflection and transmission characteristics in the case of vertical incidence of radio waves when the core material is sandwiched between the coating layers according to FIG. 18.
  • FIG. 3 is a graph showing reflection and transmission spectra. 3 is a graph showing reflection and transmission spectra.
  • FIG. 1 is a reflection and transmission spectrum of a combination of a first coat layer and a second coat layer according to Example 1.
  • 2 is a reflection and transmission spectrum of a radio wave dielectric component according to Example 1.
  • 2 is a reflection and transmission spectrum of a combination of a first coat layer and a second coat layer according to Example 2.
  • 3 is a reflection and transmission spectrum of a combination of a first coat layer and a second coat layer according to Example 3.
  • 3 is a reflection and transmission spectrum of a dielectric component for radio waves according to Example 3.
  • 3 is a reflection and transmission spectrum of a combination of a first coat layer and a second coat layer according to Example 4.
  • 3 is a reflection and transmission spectrum of a dielectric component for radio waves according to Example 4.
  • FIG. 2 is a schematic diagram of a fan beam lens.
  • 30 is a sectional view taken along line AA of the fan beam lens shown in FIG. 29.
  • FIG. 30 is a cross-sectional view taken along line BB of the fan beam lens shown
  • FIG. 1 is a schematic diagram of a radio repeater 101 according to Embodiment 1 of the present disclosure.
  • the radio wave repeater 101 includes a waveguide 1 , a first horn 2 , a first radio lens 3 , a second horn 4 , and a second radio lens 5 .
  • the base station 6 emits radio waves 7.
  • the radio waves 7 include at least one of microwaves and millimeter waves.
  • the radio wave repeater 101 relays the radio waves 7. By relaying the radio waves 7 by the radio wave repeater 101, communication using the radio waves 7 is possible between the base station 6 and the terminal 9, which are separated from each other by a shield 8 such as a wall or window.
  • the radio wave repeater 101 according to Embodiment 1 of the present disclosure also has a function of bending the radio waves 7. Therefore, even if the terminal 9 is placed in a non-line-of-sight (NLOS) location with respect to the base station 6, the radio waves 7 can be communicated without being blocked.
  • NLOS non-line-of-sight
  • the waveguide 1 is provided in a through hole 8a formed in the shield 8.
  • the waveguide 1 has a circular or square cross section. Thereby, the polarization information of the radio wave 7 incident from one end 1a of the waveguide 1 can be maintained and the radio wave 7 can be emitted to the other end 1b of the waveguide 1.
  • the first horn 2 is provided at one end 1a of the waveguide 1.
  • the first horn 2 is provided so that the opening 2a of the first horn 2 faces the direction in which the radio waves 7 are incident.
  • the first radio lens 3 is provided in the opening 2a of the first horn 2.
  • the first radio wave lens 3 converges and transmits the radio waves 7 that have entered the first radio wave lens 3 itself, and guides them to the waveguide 1 .
  • the effect of increasing the gain can be obtained even if the size of the first horn 2 is reduced. Thereby, it is possible to provide the radio wave repeater 101 that is not noticeable even when installed on a wall.
  • the radio waves 7 can be uniformly propagated from the radio wave repeater 101 into the area where the plurality of terminals 9 are placed. According to the radio wave repeater 101, it is easy to relay a plurality of polarized waves while maintaining them accurately. Moreover, depending on the selection of the material, shape, etc. of the second radio wave lens 5, the radio wave repeater 101 can emit the radio waves 7 over a wide range or a long distance.
  • the waveguide 1 may be a waveguide. Thereby, loss of the radio waves 7 passing through the waveguide 1 can be suppressed.
  • the waveguide 1 may be a flexible waveguide.
  • the direction of the first horn 2 can be freely changed, for example, the direction with respect to the base station 6 can be easily changed, and the directional gain of the first radio wave lens 3 can be utilized to the maximum. Can be done.
  • An example of "flexibility" is the ability to bend when an external force is applied and return to its original shape when the external force is removed.
  • the waveguide 1 may be a curved waveguide.
  • the direction of the first horn 2 can be freely changed, for example, the direction with respect to the base station 6 can be easily changed, and the directional gain of the first radio lens 3 can be utilized to the maximum. Can be done.
  • the directivity gain of the first radio wave lens 3 is high. By increasing the height, radio waves from the base station 6 can be received more strongly, and communication quality can be improved.
  • the directivity gain of the first radio wave lens 3 is preferably 10 dBi or more, more preferably 15 dBi or more, even more preferably 20 dBi or more, even more preferably 25 dBi or more, and even more preferably 30 dBi or more.
  • the directional gain of the first radio wave lens 3 may be 10 dBi or more.
  • the first radio wave lens 3 may have a core material made of glass, glass ceramics, or ceramics.
  • the dielectric loss tangent of the first radio wave lens 3 may be 10 ⁇ 2 or less.
  • FIG. 2 is a diagram showing an image of transmission of the radio wave 7 through the radio wave lens 10 with respect to the dielectric loss tangent of the radio wave lens 10.
  • the radio lens 10 refers to either the first radio lens 3 or the second radio lens 5.
  • the directional gain of the radio wave lens 10 may be 10 dBi or more, 15 dBi or more, 20 dBi or more, 25 dBi or more, or 30 dBi or more.
  • the radio wave lens 10 has a high directivity gain, radio waves from the base station 6 can be received more strongly, and communication quality can be improved.
  • the directional gain of the radio lens 10 may be 30 dBi or less, 25 dBi or less, 20 dBi or less, or 15 dBi or less. It may be 10 dBi or less.
  • the dielectric loss tangent of the radio wave lens 10 may be 10 ⁇ 2 or less, 10 ⁇ 3 or less, or 10 ⁇ 4 or less.
  • power loss inside the radio wave lens 10 becomes small. If the dielectric loss tangent of the radio wave lens 10 is large, the loss becomes large, which may adversely affect communication between the base station 6 and the terminal 9 using the radio waves 7.
  • the relative dielectric constant of the radio wave lens 10 may be 4 or more, 7 or more, 10 or more, or 13 or more.
  • the relative dielectric constant of the radio wave lens 10 is high, the ability to refract the radio waves 7 becomes high, the radio waves can be largely refracted with a low lens height, and the thickness of the radio wave lens 10 and the horn can be made thin.
  • the radio wave lens 10 has a dielectric material, and may absorb and scatter the radio waves 7 inside the dielectric material.
  • the difference between the maximum value and the minimum value may be 0.1 or less. This increases the gain in the radio wave repeater 101.
  • the heating rate of the atmosphere when heating the material of the radio wave lens 10 is slowed,
  • the shrinkage time associated with sintering of the material may be lengthened. These may be performed in accordance with the crystallization temperature range of the material. Thereby, a radio wave lens 10 can be obtained in which the difference between the maximum value and the minimum value of the density (in other words, relative dielectric constant) of the material within the radio wave lens 10 is small.
  • the temperature increase rate may be set such that the difference between the maximum value and the minimum value of the temperature distribution within the material is 0.5° C. or less.
  • the temperature increase rate may be 10° C. or less per hour.
  • the fan beam lens 27 is a lens that narrows down radio waves in the direction perpendicular to the ground and emits radio waves over a wide range in the horizontal direction. This suppresses the radiation of radio waves near the ceiling and the ground where they are not needed, and allows the radio waves to be radiated over a wide range in the horizontal direction where they are needed. By suppressing radiation in the vertical direction, gain in the horizontal direction is improved.
  • the thickness of the lens becomes thinner from the center to the ends.
  • the radio waves passing through the lens are bent inward as the radio waves pass through the edges, so that the radiation of the radio waves can be narrowed down.
  • the thickness of the lens is constant from the center to the end in a horizontal section passing through the center of the lens corresponding to the BB section.
  • the radio waves pass through the lens without being bent, so that the radio waves can be spread over a wide range.
  • FIG. 3 is a cross-sectional view showing a schematic configuration of a radio wave dielectric component 102 according to Embodiment 2 of the present disclosure.
  • the radio wave dielectric component 102 can be suitably used as a radio wave lens, and in particular can be used as a radio wave lens 10 of the radio wave repeater 101 (more specifically, either the first radio wave lens 3 or the second radio wave lens 5). ) can be suitably used.
  • the usage example of the radio wave dielectric component 102 is not limited to this.
  • An example of the use of the radio wave dielectric component 102 other than a radio wave lens is a member that allows radio waves 25 to pass through, such as a window.
  • the radio wave dielectric component 102 includes a core material 21, a first coat layer 22, and a second coat layer 23.
  • the antenna 24 emits radio waves 25.
  • the radio waves 25 include at least one of microwaves and millimeter waves.
  • the radio wave dielectric component 102 transmits the radio waves 25 and guides them to the radio wave receiving target 26 .
  • the core material 21 is made of a dielectric material.
  • the core material 21 has a first surface 21a and a second surface 21b.
  • the first surface 21a and the second surface 21b face each other.
  • the core material 21 is at the lowest position, and the farther from the core material 21 along the normal direction of the surface of the core material 21, the higher the position is.
  • the transmission center wavelength of the dielectric component 102 for radio waves is the center wavelength of the wavelength range of the radio waves 25 that can be transmitted through the dielectric component 102 for radio waves.
  • the wavelengths mentioned here are all wavelengths in vacuum.
  • the dielectric component 102 for radio waves even if the dielectric constant of the dielectric component 102 for radio waves is high, the amount of reflection of the radio waves 25 in the dielectric component 102 for radio waves is small. can be led to high efficiency. Furthermore, since the amount of reflection is small, side lobes are small and ghosts are less likely to occur.
  • ⁇ 1 may be 0.5 times or more and 0.9 times or less of ⁇ c.
  • ⁇ 2 may be 3.5 or less.
  • the values of ⁇ c, ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, tc, t1, t2, t3, and t4 may vary depending on the position within the radio wave dielectric component 102.
  • Each of ⁇ c, ⁇ 1, ⁇ 2, ⁇ 3, ⁇ 4, tc, t1, t2, t3, and t4 may be an average value of values obtained at each of a plurality of positions.
  • the core material 21 may be a radio wave lens.
  • Core material 21 may be made of glass, glass ceramics, or ceramics.
  • the first coat layer 22 may be made of glass, glass ceramics, or ceramics.
  • the second coat layer 23 may be made of PTFE (polytetrafluoroethylene) or other resin.
  • the frequency will be 30.0 GHz ⁇ 3 GHz (fractional bandwidth: 20%), keeping in mind the 5G millimeter wave band (27 to 30 GHz) in Japan. This is not intended to limit this disclosure. Rather, by setting the length or thickness as exemplified below to 1/n, it is possible to correspond to the use of the (30 ⁇ n) GHz band, which is expected to appear in the future.
  • FIG. 5 is a graph showing simulation results of reflection and transmission characteristics of ceramics (thickness 10 mm) with a dielectric constant of 12.
  • the material itself is assumed to be lossless. Even if the material itself is lossless, the transmission loss can be as high as 5 dB depending on the frequency due to surface reflection. It can be said that surface reflection greatly contributes to the loss.
  • One of the objects and advantages of the present disclosure is to provide a coating structure that suppresses reflection and reduces transmission loss.
  • reflection at a dielectric interface only needs to have a small refractive index ratio.
  • the index of refraction is the square root of the dielectric constant, so the lower the dielectric constant (ie, the closer it is to 1), the lower the reflection.
  • the design method is known.
  • the radio wave is a combination of multiple reflections: reflection at the interface entering the dielectric from the air and reflection at the interface exiting the dielectric layer.
  • FIG. 6 is a graph showing the reflection and transmission characteristics of PTFE (3.3 mm thick) when the radio wave 25 is vertically incident.
  • the present disclosure provides the relative permittivity and thickness of each of the first coat layer 22 and the second coat layer 23, thereby suppressing reflection of radio waves 25 in a desired frequency band and obtaining good transmission characteristics.
  • Equation (8) The relative permittivity of the first coat layer 22 and the second coat layer 23 is increased from the outside toward the inside. By reducing the difference in dielectric constant at the interface between each dielectric layer, overall reflection is suppressed.
  • Equation (12) defines the dielectric constant of the second coat layer 23. This is a practical condition that a practical low dielectric constant material has a dielectric constant of approximately 3.5 or less.
  • Each of the first coat layer 22 and the second coat layer 23 has a dielectric constant and a thickness that minimize reflection at a desired frequency.
  • the layer obtained by laminating the first coat layer 22 and the second coat layer 23 has the same reflection minimum value.
  • each of the first coat layer 22 and the second coat layer 23 has a lower dielectric constant than the core material 21, the reflection characteristics of the first coat layer 22 and the second coat layer 23 become an envelope, and the reflection characteristics of the core material 21 Reflection characteristics are superimposed.
  • the present disclosure provides a broadband low-reflection coating layer by mixing reflected waves between the first coating layer 22 and the second coating layer 23, and uses a novel idea of mixing reflected waves. There is.
  • the present disclosure is generally used when the core material 21 is a high dielectric material with a dielectric constant of 6 or more.
  • the dielectric constant may be less than 6, the effect is not much different from that of a single layer coating. Practically, it is effective to use it for glass, ceramics (including LTCC and HTCC), etc., which have a dielectric constant of 8 or more.
  • first coat layer 22 and the second coat layer 23 of the present disclosure By attaching the first coat layer 22 and the second coat layer 23 of the present disclosure to a plate material such as glass or ceramics having a relatively high dielectric constant, reflection can be suppressed and the transmission characteristics of the radio waves 25 can be improved. can. It can be applied to windows or walls of houses. Further, by bonding the first coat layer 22 and the second coat layer 23 of the present disclosure on both sides of the core material 21, the directivity gain of the radio wave dielectric component 102 as a radio wave lens can be increased.
  • FIG. 12 shows the reflection and transmission characteristics when the radio wave 25 is vertically incident when the thickness t1 of the first coat layer 22 is increased from 0.92 mm to 1 mm (approximately 10% increase) with respect to the characteristics shown in FIG. 9. .
  • the frequency at which low reflection occurs is shifted to the lower frequency side by approximately 10%, and low reflection occurs at 27 GHz.
  • FIG. 13 shows the characteristics when the second coat layer 23 and the first coat layer 22 having a thickness t1 of 1 mm are stacked. This characteristic is caused by the fact that the characteristic shown in FIG. 10 is broken down because the thickness of the first coat layer 22 is 10% larger. Because the low reflection valley on the side has shifted to the lower frequency side, the 30 GHz valley and 37 GHz valley in Figure 10 are combined into the 33 GHz valley in Figure 13, and the valley that was at 23 GHz in Figure 10 has shifted to 21 GHz, and the 37 GHz valley in Figure 10 has shifted to 25 GHz. The peak of is getting bigger and is below -20dB. This is one basis for the limit value of the present disclosure. When the first coat layer 22 becomes thinner, the frequency shifts to the higher frequency side, but the situation remains the same.
  • FIG. 20 is a graph showing reflection and transmission spectra under the following conditions.
  • FIG. 21 is a graph showing reflection and transmission spectra under the following conditions.
  • FIG. 27 shows the reflection and transmission spectra of the combination of the first coat layer 22 and the second coat layer 23 according to Example 4.
  • FIG. 28 shows reflection and transmission spectra of the radio wave dielectric component 102 according to Example 4.
  • Example 2 at the upper limit of the range defined by formula (2), the band in which reflection is suppressed is narrower than in Example 1, but is still sufficiently wide.
  • a dielectric component for radio waves includes a core material made of a dielectric material and having a first surface and a second surface facing each other, and a core material provided on the first surface. a first coat layer including one region, and a second coat layer provided on the first region and including a second region, and the relative dielectric constant of the core material is ⁇ c. , the dielectric constant of the first region is ⁇ 1, the dielectric constant of the second region is ⁇ 2, the thickness of the first region is t1, the thickness of the second region is t2, a dielectric component for radio waves.
  • the first coat layer includes a third region provided on the second surface
  • the second coat layer includes a fourth region provided above the third region
  • the relative permittivity of the third region is ⁇ 3
  • the relative permittivity of the fourth region is ⁇ 4
  • the third region When the thickness is t3 and the thickness of the fourth region is t4, the following formula (4), the following formula (5), and the following formula (6) ⁇ 4 ⁇ 3 ⁇ c...(4) 0.9 ⁇ /4 ⁇ ( ⁇ 3) ⁇ t3 ⁇ 1.1 ⁇ /4 (5) 0.9 ⁇ /4 ⁇ ( ⁇ 4) ⁇ t4 ⁇ 1.1 ⁇ /4 (6) satisfy.
  • the value of ⁇ 1 and the value of ⁇ 3 are the same, the value of ⁇ 2 and the value of ⁇ 4 are the same, and the value of t1 and the value of t3 are the same.
  • the values of t2 and t4 are the same.
  • ⁇ 1 is 0.5 times or more and 0.9 times or less of ⁇ c.
  • the core material is a radio wave lens.
  • the core material is made of glass, glass ceramics, or ceramics.
  • the first coat layer is made of glass, glass ceramics, or ceramics.
  • the coat layer provided on the core material is composed of two of the first coat layer and the second coat layer. It consists of layers.
  • Waveguide 1a One end of the waveguide 1b The other end of the waveguide 2 First horn 2a Opening of the first horn 3 First radio wave lens 4 Second horn 4a Opening of the second horn 5 Second radio lens 6 Base station 7 Radio wave 8 Shielding object 8a Through hole 9 Terminal 10 Radio wave lens 21 Core material 21a 1st surface 21b 2nd surface 22 1st coat layer 22a 1st region 22b 3rd region 23 2nd coat layer 23a 2nd region 23b 4th region 24 Antenna 25 Radio waves 26 Radio wave reception target 27 Fan beam lens 101 Radio wave repeater 102 Radio wave dielectric parts

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Abstract

La présente invention a pour objet de réduire la quantité de réflexion d'ondes électriques. La constante diélectrique relative d'un matériau (21) de cœur étant définie comme εｃ, la constante diélectrique relative d'une première région (22a) étant définie comme ε１, la constante diélectrique relative d'une seconde région (23a) étant définie comme ε２, l'épaisseur de la première région (22a) étant définie comme t1, l'épaisseur de la seconde région (23a) étant définie comme t2, et la longueur d'onde centrale de transmission de ce composant diélectrique pour ondes électriques (102) étant définie comme λ, la formule (1), la formule (2), et la formule (3): ε2 < ε1 < εc … (1), 0,9 × λ/4 ≤ √(ε1) × t1 ≤ 1,1 × λ/4 … (2), et 0,9 × λ/4 ≤ √(ε2) × t2 ≤ 1,1 × λ/4 … (3) sont satisfaites.
PCT/JP2023/022023 2022-06-22 2023-06-14 Composant diélectrique pour ondes électriques WO2023248882A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03119807A (ja) * 1989-09-26 1991-05-22 Hughes Aircraft Co 広い入射角度のためのラドームおよびレンズ用２層整合誘電体
JPH06196915A (ja) * 1992-11-04 1994-07-15 Takenaka Komuten Co Ltd 電波透過体を用いたアンテナユニット
JP2002009542A (ja) * 2000-06-22 2002-01-11 Nec Corp アンテナ装置
JP2007270459A (ja) * 2006-03-30 2007-10-18 Tokyu Construction Co Ltd 建物用壁材及び無線伝送システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03119807A (ja) * 1989-09-26 1991-05-22 Hughes Aircraft Co 広い入射角度のためのラドームおよびレンズ用２層整合誘電体
JPH06196915A (ja) * 1992-11-04 1994-07-15 Takenaka Komuten Co Ltd 電波透過体を用いたアンテナユニット
JP2002009542A (ja) * 2000-06-22 2002-01-11 Nec Corp アンテナ装置
JP2007270459A (ja) * 2006-03-30 2007-10-18 Tokyu Construction Co Ltd 建物用壁材及び無線伝送システム

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