WO2005112189A1 - 電波装置 - Google Patents
電波装置 Download PDFInfo
- Publication number
- WO2005112189A1 WO2005112189A1 PCT/JP2005/004108 JP2005004108W WO2005112189A1 WO 2005112189 A1 WO2005112189 A1 WO 2005112189A1 JP 2005004108 W JP2005004108 W JP 2005004108W WO 2005112189 A1 WO2005112189 A1 WO 2005112189A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radio wave
- wave device
- dielectric
- polystyrene
- protective housing
- Prior art date
Links
- 230000001681 protective effect Effects 0.000 claims description 102
- 239000004794 expanded polystyrene Substances 0.000 claims description 70
- 239000010409 thin film Substances 0.000 claims description 60
- 229920006327 polystyrene foam Polymers 0.000 claims description 50
- 239000006260 foam Substances 0.000 claims description 45
- 229920006248 expandable polystyrene Polymers 0.000 claims description 39
- 239000011248 coating agent Substances 0.000 claims description 33
- 238000000576 coating method Methods 0.000 claims description 33
- 239000010408 film Substances 0.000 claims description 30
- 239000004793 Polystyrene Substances 0.000 claims description 21
- 229920002223 polystyrene Polymers 0.000 claims description 21
- 239000011347 resin Substances 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 17
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims description 12
- 238000005187 foaming Methods 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 6
- 230000008094 contradictory effect Effects 0.000 abstract description 2
- 230000005672 electromagnetic field Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 16
- 238000005259 measurement Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 11
- 238000010586 diagram Methods 0.000 description 6
- 229920006328 Styrofoam Polymers 0.000 description 5
- 239000008261 styrofoam Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 239000003973 paint Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006261 foam material Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 125000003011 styrenyl group Chemical group [H]\C(*)=C(/[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- 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
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/06—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using refracting or diffracting devices, e.g. lens
Definitions
- the present invention relates to a radio wave device provided with a protective housing for protecting a radio wave device that receives or reflects radio waves.
- an antenna used for a radar installed in the field is used with the antenna element portion exposed despite the fact that mechanical strength against external factors such as wind and rain is insufficient. ing.
- the reason for this is that if a reinforcing member for reinforcing the antenna element portion is attached to the antenna element portion in order to protect the antenna element portion and to increase the mechanical strength, the breakage force due to external factors such as wind and rain is also effective. This is because the reinforcing member attached causes radio wave loss to radio waves incident on the antenna and degrades the directivity of the antenna.
- a radome covering the entire antenna is used.
- the radome is formed into a spherical shape, a cylindrical shape, a rectangular solid shape or the like by a skeletal member, and the surface of the skeletal member is covered and protected by a surface protective material.
- a dielectric plate such as FRP (reinforced plastic, hereinafter referred to as FRP) is generally used as a radio wave transmission material, and it is made of a dielectric having the same property as this FRP.
- FRP reinforcementd plastic
- antenna device 111 As an antenna device using a spherical lens represented by a Luneberg lens, there is an antenna device 111 shown in FIG.
- the antenna device 111 is filled with a foam material between the spherical lens 114 and the redome 133 to form the foam layer 134, thereby combining the two, thereby holding the spherical lens 114 from the radome 133. I see.
- Patent Document 1 Japanese Patent Application Publication No. 2001-102857
- radome 133 in FIG. 13 and FRP used as a surface protection material for general radome have excellent performance as a structural material that is lightweight and strong in tension, bending, and compression.
- the dielectric constants of the respective compositions constituting the FRP are different, in particular, radio waves in a short wavelength band of a millimeter wave band (frequency: 30 to 300 GHz) or more are incident on an antenna disposed in the radome. There is a problem that radio wave scattering and radio wave losses increase significantly. In addition, it is difficult to obtain a surface protection material such as FRP having a uniform composition over the entire surface of the radome, and depending on the frequency, the beam characteristics of the incident radio wave may be different.
- the expanded polystyrene used in the foam layer 134 in FIG. 13 is also said to have an increase in radio wave loss for radio waves in the short wavelength band of the millimeter wave band (frequency 30 to 300 GHz) or more. There's a problem.
- the invention according to claim 1 is a protective housing for protecting a radio wave device disposed inside, and a radio wave device in which the radio wave device is arranged inside the protective housing, the protective housing is a radio wave device Formed of a foamed polystyrene structure formed of a foamed polystyrene having a relative dielectric constant that is transparent to radio waves, a high hardness that surrounds the surface of the foamed polystyrene structure, and a sufficiently thin film compared to the wavelength And the resulting dielectric thin film.
- the invention according to claim 2 is a protective housing for protecting a radio wave device disposed inside, and a radio wave device in which the radio wave device is arranged inside the protective housing, the protective housing is a radio wave device Formed of a foamed polystyrene structure formed of a foamed polystyrene having a relative dielectric constant that is transparent to radio waves, a high hardness that surrounds the surface of the foamed polystyrene structure, and a sufficiently thin film compared to the wavelength
- the foam polystyrene structure is made by sealing the foam polystyrene in a state of being in close contact with the periphery of the radio wave device.
- the invention according to claim 3 is a protective housing for protecting a radio wave device disposed inside, and a radio wave device in which the radio wave device is arranged inside the protective housing, the protective housing is a radio wave device Formed of a foamed polystyrene structure formed of a foamed polystyrene having a relative dielectric constant that is transparent to radio waves, a high hardness that surrounds the surface of the foamed polystyrene structure, and a sufficiently thin film compared to the wavelength
- the radio equipment disposed inside the protective housing is an antenna
- the invention according to claim 4 is a protective housing for protecting the radio equipment disposed inside, and the protective housing for the protection.
- the protective housing has a dielectric constant that is transparent to radio waves around the radio wave device.
- a foamed foam comprising a foamed polystyrene structure formed of expanded polystyrene and a dielectric thin film formed to have a high hardness surrounding the surface of the expanded polystyrene structure and sufficiently thin compared to the wavelength.
- the styrene structure is sealed in a state in which the foam polystyrene is in close contact with the periphery of the radio wave device, and the radio wave device disposed inside the protective housing is an antenna.
- the invention according to claim 5 is a protective housing for protecting a radio wave device disposed inside, and a radio wave device in which the radio wave device is arranged inside the protective housing, the protective housing is a radio wave device Formed of a foamed polystyrene structure formed of a foamed polystyrene having a relative dielectric constant that is transparent to radio waves, a high hardness that surrounds the surface of the foamed polystyrene structure, and a sufficiently thin film compared to the wavelength
- the radio wave device is a spherical dielectric wave lens, and the polystyrene foam structure covers the surface of the dielectric wave lens and has a radius equal to the focal length of the dielectric wave lens. Furthermore, the foam polystyrene is sealed in close contact with the periphery of the radio equipment.
- the invention according to claim 6 is a protective housing for protecting a radio wave device disposed inside, and a radio wave device in which the radio wave device is arranged inside the protective housing, the protective housing is a radio wave device Formed of a foamed polystyrene structure formed of a foamed polystyrene having a relative dielectric constant that is transparent to radio waves, a high hardness that surrounds the surface of the foamed polystyrene structure, and a sufficiently thin film compared to the wavelength
- the radio wave device is a spherical dielectric wave lens, and the polystyrene foam structure covers the surface of the dielectric wave lens and has a radius equal to the focal length of the dielectric wave lens. Furthermore, the foam polystyrene was sealed in a state of being in close contact with the periphery of the radio wave device, and a radio wave reflector for reflecting radio waves was formed on the surface of the foam polystyrene structure. It is.
- the invention according to claim 7 is a protective housing for protecting a radio wave device disposed inside, and a radio wave device in which the radio wave device is arranged inside the protective housing, the protective housing is a radio wave device Formed of a foamed polystyrene structure formed of a foamed polystyrene having a relative dielectric constant that is transparent to radio waves, a high hardness that surrounds the surface of the foamed polystyrene structure, and a sufficiently thin film compared to the wavelength
- the radio wave device is a spherical dielectric wave lens, and the polystyrene foam structure covers the surface of the dielectric wave lens and has a radius equal to the focal length of the dielectric wave lens. Furthermore, the foam polystyrene is sealed in close contact with the circumference of the radio equipment,
- the surface of the roll structure is provided with a radio wave receiver for receiving light with a spherical dielectric radio wave lens.
- the invention according to claim 8 is the invention according to claim 1, wherein the dielectric thin film is a dielectric coating film formed by applying a resin, and the invention according to claim 9
- the foam ratio of the expanded polystyrene of the expanded polystyrene structure is 20 times or more, and the thickness of the dielectric coating film is 2 mm or less.
- foamed urethane is used in place of the expanded polystyrene of the expanded polystyrene structure.
- the invention according to claim 11 is the invention according to claim 1, wherein the dielectric thin film is a dielectric coating film formed by applying a resin, and a foamed polystyrene foam structure.
- the foaming rate of Tyrol is 20 times or more, and the thickness of the dielectric coating film is 2 mm or less.
- the invention according to claim 1 relates to the invention according to claim 1.
- the body thin film is a dielectric coating film formed by applying a resin, and urethane foam is used in place of the foam polystyrene of the foam polystyrene structure, and the invention according to claim 13 is claim 1
- the urethane foam is used in place of the polystyrene foam of the polystyrene foam structure, and the foaming rate of the urethane foam is 20 times or more and the thickness of the dielectric coating film is 2 mm or less.
- the invention according to claim 14 is the invention according to claim 1 in which the dielectric thin film is a dielectric coating film formed by applying a resin, and it is preferable that the dielectric thin film be a foamed polystyrene structure.
- the foaming ratio of the urethane foam is 20 times or more, and the thickness of the dielectric coating film is 2 mm or less.
- the radio equipment disposed inside the protective housing may be subjected to external factors such as wind and rain, sudden event force during measurement, etc. Mechanical deformation does not occur. Furthermore, the effect of shielding, absorption, and scattering of radio waves by the protective housing is small and the effects are strong and lightweight.
- a polystyrene foam structure a polystyrene foam having a dielectric constant that is transparent to radio waves is used, and the dielectric thin film can be formed sufficiently thin compared to the wavelength, so the protective housing Can be of any shape.
- the invention according to claim 3 is as described above. Therefore, even when the antenna disposed inside the protective housing rotates as a parabola antenna of a radar, claim 1 and It has the same effect. Further, since the invention according to claim 4 is as described above, even if the antenna disposed inside the protective housing is a rod-like antenna such as a dipole antenna, the periphery thereof is kept in close contact by the expanded polystyrene. Therefore, in addition to the effects described in claim 2, it is possible to maintain high strength against local load and to maintain weather resistance.
- the invention according to claim 5 is as described above, so the surface force of the dielectric radio wave lens disposed inside the protective housing may be an external factor such as wind and rain or a sudden event during measurement. There is no further damage and no mechanical deformation occurs. Therefore, distortion as a radio wave lens does not occur with respect to incident electric waves, and therefore, the same effect as in claim 2 is obtained. Furthermore, the focal length with respect to the incident radio wave does not change. In addition, the effects of shielding, absorption, and scattering of radio waves are reduced, and they are robust and lightweight.
- the invention according to claim 7 is as described above, it is possible to use the foamed polystyrene structure and the dielectric wave lens as a Luneberg lens having the same characteristics in all directions, and to receive radio waves. It is possible to receive an incoming radio wave by the unit.
- the dielectric thin film is a dielectric coated film coated with a resin, and the expansion ratio of the expanded polystyrene of the expanded polystyrene structure is 20 times or more. Since the thickness of the body coating film is 2 mm or less, it has the same effect S as in claims 1 and 2, and it is robust and lightweight with almost no influence of radio wave shielding, absorption and scattering by the protective housing. A radio wave device provided with a protective housing is obtained.
- FIG. 1 shows a first embodiment of the present invention, and is a schematic view showing a protective housing 1 and a radio wave device disposed therein.
- FIG. 2 shows an embodiment of the present invention, and is a characteristic diagram showing the relationship between loss and frequency when the material used for the dielectric thin film 5 is made of efletan or FRP.
- FIG. 3 An embodiment of the present invention, showing the relationship between the thickness of the dielectric thin film 5 and the loss when the expansion ratio of the expanded polystyrene of the expanded polystyrene structure 4 is 20 times, with the frequency as a parameter.
- FIG. 4 shows an embodiment of the present invention, and shows the relationship between the thickness of the dielectric thin film 5 and the loss when the expansion ratio of the expanded polystyrene of the expanded polystyrene structure 4 is 30 times with the frequency as a parameter.
- FIG. 4 shows an embodiment of the present invention, and shows the relationship between the thickness of the dielectric thin film 5 and the loss when the expansion ratio of the expanded polystyrene of the expanded polystyrene structure 4 is 30 times with the frequency as a parameter.
- FIG. 5 shows an embodiment of the present invention, and shows the relationship between the thickness of the dielectric thin film 5 and the loss when the expansion ratio of the expanded polystyrene of the expanded polystyrene structure 4 is 40 times with the frequency as a parameter.
- FIG. 5 shows an embodiment of the present invention, and shows the relationship between the thickness of the dielectric thin film 5 and the loss when the expansion ratio of the expanded polystyrene of the expanded polystyrene structure 4 is 40 times with the frequency as a parameter.
- FIG. 6 shows an embodiment of the present invention, wherein frequency is a parameter, and the thickness of dielectric thin film 5 is a characteristic showing the relationship between the expansion ratio of the expanded polystyrene and the loss of the expanded polystyrene structure 4 in the case of O. 5 mm.
- FIG. 6 shows an embodiment of the present invention, wherein frequency is a parameter, and the thickness of dielectric thin film 5 is a characteristic showing the relationship between the expansion ratio of the expanded polystyrene and the loss of the expanded polystyrene structure 4 in the case of O. 5 mm.
- FIG. 7 shows an embodiment of the present invention, and is a characteristic diagram showing the relationship between the expansion ratio of the expanded polystyrene and the loss of the expanded polystyrene structure 4 when the thickness of the dielectric thin film 5 is 1 mm, using the frequency as a parameter. It is.
- FIG. 8 shows an embodiment of the present invention, wherein the frequency is a parameter showing the relationship between the expansion ratio of the expanded polystyrene and the loss of the expanded polystyrene structure 4 when the thickness of the dielectric thin film 5 is 2 mm.
- FIG. 9 shows an example of the present invention and is a characteristic diagram showing the relationship between the expansion ratio of the expanded polystyrene and the loss of the expanded polystyrene structure 4 when the thickness of the dielectric thin film 5 is 3 mm, using the frequency as a parameter. It is.
- FIG. 10 is a schematic view showing a second embodiment of the present invention, showing a protective housing 11 and a radio wave device disposed inside the protective housing 11.
- FIG. 11 is a schematic view showing a third embodiment of the present invention, showing a protective housing 21 and a radio wave device disposed inside the protective housing 21.
- FIG. 12 shows a fourth embodiment of the present invention, and is a schematic view showing a protective housing 31 and a radio wave device disposed inside the protective housing 31.
- FIG. 13 is a perspective view showing an embodiment of a conventional antenna device.
- a protective housing is used in a protective housing for protecting a radio wave device disposed inside, and a radio wave device in which a radio wave device such as an antenna or a dielectric radio wave lens is disposed inside the protective housing.
- a polystyrene foam structure formed by sealing in a state in which polystyrene foam having a relative dielectric constant having transparency to radio waves is in close contact with a radio wave device, high hardness to surround the surface of the polystyrene foam structure, and wavelength.
- the dielectric thin film is formed of a dielectric thin film formed sufficiently thin, and the dielectric thin film is a dielectric coating film formed by applying a resin.
- the expansion ratio of expanded polystyrene is more than 20
- the thickness of the body coating film shall be 2 mm or less.
- FIG. 1 is a schematic view showing a protective housing 1 and radio equipment disposed therein
- FIG. 2 is a dielectric thin film 5
- Fig. 3 is a characteristic showing the relationship between the thickness of the dielectric thin film 5 and loss with the frequency as a parameter.
- FIG. 3 shows the case where the expansion ratio of the expanded polystyrene of the expanded polystyrene structure 4 is 20 times
- FIG. 4 shows the case where the expansion ratio is 30 times
- FIG. 6 to 9 are characteristic diagrams showing the relationship between the expansion ratio and the loss of the expanded polystyrene of the expanded polystyrene structure 4 with the frequency as a parameter.
- FIG. 6 is a graph showing that the thickness of the dielectric thin film 5 is 0.
- FIG. 7 shows the case of 1 mm in thickness
- FIG. 8 the case of 2 mm in thickness
- FIG. 9 the case of 3 mm in thickness.
- the inventors of the present invention should find a dielectric material suitable as a protective member of an antenna which has sufficient mechanical strength to protect the antenna even when used in the millimeter wave band and has little radio wave loss. We conducted research on various dielectric materials.
- the inventors pay attention to the use of lightweight polystyrene foam as a protective member for the antenna, and the polystyrene foam is used to form a protective housing for protecting the antenna, and to use the protective housing.
- the problem of polystyrene foam occurred when the radio wave loss in the millimeter wave band increased.
- the inventors etc. have used a resin or the like as a protective member other than styrofoam to coat the styrofoam surface, thereby allowing styrofoam to be used. It was tried to form a protective housing by bringing the resin and the like into close contact. Apply commonly used resin etc. to the surface of polystyrene foam while At the time of clothing, the polystyrene foam itself melted and could not be used as a protective housing.
- EPS polystyrene foam
- Efletan registered trademark
- this resin can be coated on expanded polystyrene and that the coating can effectively reinforce expanded polystyrene.
- the inventors conducted various experiments to determine the properties of the resin for coating on radio waves, and as a result, the polystyrene foam having a foaming ratio higher than that of general polystyrene foam has a relative dielectric constant of 1. It turned out that it has the property which has transparency in the radio wave in the vicinity.
- the inventors prototyped the protective housing 1 using the expanded polystyrene coated polystyrene foam.
- the radio wave device disposed in the protective housing 1 is composed of an antenna 2 and an antenna support bar 3 for supporting the antenna 2.
- the antenna 2 is a dipole antenna, and in this embodiment, a metal rod having a length corresponding to 1Z2 of the wavelength of the radio wave incident on the antenna 2 is used.
- the antenna 2 is supported by the antenna support rod 3 It is done.
- the antenna 2 is fed via a feeder (not shown) passing through the inside of the antenna support bar 3!
- Protective housing 1 is formed of a foamed polystyrene structure 4 and a dielectric thin film 5.
- expanded polystyrene structure 4 expanded polystyrene foam having a specific dielectric constant that is transparent to radio waves is sealed in a state of being in close contact with the periphery of an electric device configured by the antenna 2 and the antenna support rod 3.
- the dielectric thin film 5 surrounds the surface of the foamed polystyrene structure 4 and has a high hardness and a sufficiently thin thickness compared to the wavelength.
- the protective housing 1 is configured as described above, the antenna 2 and the antenna support bar 3 disposed inside are kept in close contact by the expanded polystyrene foam, so that it is possible to prevent wind and rain. There is no possibility of mechanical deformation such as bending resulting from external factors such as a sudden event during measurement. Furthermore, since the expanded polystyrene structure 4 uses a high ratio of expanded polystyrene, it maintains sufficient strength against static load applied to the antenna 2 and the antenna support rod 3.
- the dielectric thin film 5 uses a high hardness of the flexible material, and the expanded polystyrene structure 4 retains the strength against the local load on the antenna 2 and the antenna supporting rod 3 which are lacking and the weather resistance.
- the inventors have found that the foam ratio of the expanded polystyrene used in the expanded polystyrene structure 4 and the thickness of the coating film coated with the efletan used in the dielectric thin film 5 (hereinafter referred to).
- the foam ratio of the expanded polystyrene used in the expanded polystyrene structure 4 and the thickness of the coating film coated with the efletan used in the dielectric thin film 5 (hereinafter referred to
- the following various experiments were conducted.
- the loss of radio waves at the three frequencies is small in the protective housing 1 using efletan, but 85 GHz in the case of the protective housing using the conventional FRP.
- the loss of radio waves increased significantly, and the effectiveness of efletan could be confirmed.
- Figs. 3 to 5 show the use of expanded polystyrene which is 20 times, 30 times and 40 times the expansion ratio 1S of the expanded polystyrene constituting the expanded polystyrene structure 4, respectively, as a test sample and using the frequency as a parameter. Coating thickness of dielectric thin film 5 mm and radio wave loss The vertical axis shows the loss of radio waves incident on the antenna 2 [dB], and the horizontal axis shows the thickness ( mm ) of the coating of Efletan.
- Fig. 3 shows the measurement results when the foam ratio is 20 times the sample
- Fig. 4 shows the sample with the foam ratio 30 times
- Fig. 5 shows the sample with the foam ratio 40 times.
- FIGS. 6 to 9 use efletan as the dielectric thin film 5, and the thickness of the coating of the efletan is 0.5 mm, 1 mm, 2 mm, and 3 mm for testing. It is used as a sample, and the relationship between foam ratio and loss of radio wave dB is measured with frequency as a parameter.
- the vertical axis is the loss of radio wave incident on antenna 2 [dB], and the horizontal axis is the foam foam foam. It shows the rate (fold).
- 6 shows the case where the thickness of the paint film is 0.5 mm
- FIG. 7 shows the case where the thickness of the paint film is 1 mm
- FIG. 8 shows the case where the thickness of the paint film is 2 mm
- FIG. The measurement results for 3 mm are shown.
- Fig. 3-Fig. 5 and Fig. 6-Fig. 9 as frequencies to be measured, three points of 76 GHz, 85 GHz and 94 GHz in the millimeter wave band are shown.
- the mouth shows the measurement results for 85 GHz and - ⁇ - ⁇ shows the measurement results for 94 GHz.
- the thickness of the coating film of Eflatane is measured at four points of 0.5 mm, 1 mm, 2 mm and 3 mm, and in Fig. 6-Fig. The measurements were taken at three points: 20x, 30x and 40x.
- the thickness of the coating film of the dielectric thin film 5 is the loss of radio waves when the thickness of the coating film is 3 mm, particularly when the thickness is 2 mm or less where the loss at high frequencies of 85 GHz and 94 GHz is large. The result was found to be less than optimal. And, when the thickness of the coating film of the dielectric thin film 5 is 2 mm or less, the foaming ratio of the expanded polystyrene foam used in the expanded polystyrene structure 4 is small in the radio wave loss at all magnifications. If the rate is 20 times or more, the results were obtained.
- the second embodiment of the present invention is an embodiment in which the antenna supporting rod 3 for supporting the antenna 2 in the first embodiment is omitted.
- a second embodiment of the present invention will be described in detail based on FIG.
- the same name is used for the same part as the first embodiment. The explanation is omitted.
- FIG. 10 shows a second embodiment of the present invention, and is a schematic view showing a protective housing 11 and a radio wave device disposed therein.
- the radio equipment disposed in the protective housing 11 is composed of an antenna 2 and a feeder 12 for feeding the antenna 2.
- a feeder 12 is connected to the antenna 2, and the antenna 2 is supplied with power via the feeder 12.
- the entire periphery of the antenna 2 and the feeder 12 that constitute the radio wave device is sealed in a state in which the expanded polystyrene foam having a relative dielectric constant that is transparent to the radio wave is in close contact Furthermore, the surface of the expanded polystyrene structure 4 is surrounded by a dielectric thin film 5 to constitute a protective housing 11. Therefore, the antenna 2 is supported by the expanded polystyrene structure 4 without the antenna supporting rod, and is protected by the expanded polystyrene structure 4 and the dielectric thin film 5 as in the first embodiment. .
- the antenna 2 and the feeder 12 as radio equipment disposed inside are held in a state where their peripheries are in close contact with each other by Styrofoam, and therefore external There is no mechanical deformation such as bending caused by factors or sudden events during measurement.
- high strength can be maintained and weatherability can be maintained against local loading on a rod-like antenna such as a dipole antenna.
- the antenna support bar is omitted, the number of parts is reduced, the structure is simplified, and reflection of radio waves by the antenna support bar can be prevented.
- the third embodiment of the present invention is an embodiment in which a spherical dielectric radio wave lens 22 is used as a radio wave device disposed in the protective housing 21.
- a third embodiment of the present invention will be described in detail with reference to FIG.
- the same parts as those in the first and second embodiments are designated by the same names and reference numerals, and the description thereof is omitted.
- FIG. 11 shows a third embodiment of the present invention, and is a schematic view showing a protective housing 21 and a radio wave device disposed therein.
- the radio wave device disposed in the protective housing 21 is a spherical dielectric.
- a radio wave lens 22 and a radio wave reflector 23 constitute a lens.
- the expanded polystyrene structure 4 is spherical, and the radius thereof is formed to be equal to the focal length of the dielectric wave lens 22. That is, the foam polystyrene structure 4 is formed such that the radio wave incident on the dielectric radio wave lens 22 through the foam structure 4 is focused on the surface of the foam polystyrene structure 4.
- a radio wave reflector 23 for reflecting the radio waves is formed on the surface of the foam polystyrene structure 4 where the incident radio waves are focused.
- the entire surface of the foamed polystyrene structure 4 and the radio wave reflector 23 are surrounded by the dielectric thin film 5 to constitute a protective housing 21.
- the radio wave incident on the dielectric radio wave lens 22 through the polystyrene foam structure 4 is reflected by the radio wave reflector 23 on the surface of the polystyrene foam structure 4 and is reflected in the same direction as the incident wave.
- the dielectric radio wave lens 22 and the radio wave reflector 23 are protected by an external factor equal force by the protective housing 21 formed of the foam polystyrene structure 4 and the dielectric thin film 5 as in the first embodiment. It is.
- the foam polystyrene structure 4 and the dielectric radio wave lens 22 can be used as Luneberg lenses having the same characteristics in all directions, as well as the radio wave reflector.
- a radio wave reflection device capable of reflecting the radio wave incident in the same direction according to 23 can be obtained.
- the fourth embodiment of the present invention in the third embodiment, instead of forming the radio wave reflector 23 on the surface of the foam polystyrene structure 4, an electromagnetic wave received by the spherical dielectric radio wave lens 22 is used. It is an Example at the time of forming a receiving part.
- a fourth embodiment of the present invention will be described in detail based on FIG.
- the same parts as those in the first embodiment, the second embodiment and the third embodiment are designated by the same names and reference numerals, and the description thereof will be omitted.
- FIG. 12 shows a fourth embodiment of the present invention, and is a schematic view showing a protective housing 31 and radio equipment disposed inside.
- the radio equipment disposed in the protective housing 31 is the same as that of the third embodiment.
- the expanded polystyrene structure 4 is spherical, and the radius thereof is formed to be equal to the focal length of the dielectric wave lens 22. That is, the foam polystyrene structure 4 is formed such that the radio wave incident on the dielectric radio wave lens 22 through the foam polystyrene structure 4 is focused on the surface of the foam polystyrene structure 4.
- a radio wave receiver 32 for receiving radio waves incident on the dielectric radio wave lens 22 is formed on the surface of the foamed polystyrene structure 4 where the incident radio waves are focused, and the radio wave receiver 32 is provided with a feeder. 33 are connected, and the radio wave receiver 32 is supplied with power via the feeder 33. Furthermore, the entire surface of the foam structure 4, the radio wave receiver 32 and the feeder 33 are surrounded by the dielectric thin film 5. Therefore, the radio wave device is constituted by the dielectric radio wave lens 22, the radio wave receiving portion 32 and the feeder 33, the protective housing 31 is constituted by the foamed polystyrene structure 4 and the dielectric thin film 5, and the radio wave device inside is outside. Protection from environmental factors.
- the foamed polystyrene structure 4 and the dielectric radio wave lens 22 can be used as Luneberg lenses having the same characteristics in all directions.
- the radio wave receiver 32 can receive the incoming radio wave.
- the housing for protection is a foamed polystyrene having a dielectric constant that is transparent to radio waves and has an air gap around the radio equipment.
- the surface of the foamed polystyrene structure is formed into a structure surrounded by a dielectric thin film which has a high hardness and is sufficiently thin compared to the wavelength.
- a cavity is formed inside the protective housing. Therefore, as an internal radio wave device, it is also possible to protect an antenna that rotates like a parabola antenna of a radar. It can be used as a housing.
- the housing for protecting the radio wave device according to the present invention can be used both indoors and outdoors, and it can also be used as a radome with an air cavity for rotating the rotating part like a parabolic antenna such as a scanning radar. is there. Also, since it can be formed into any shape, it can be used to hide the radome in places where it is visible.
Landscapes
- Details Of Aerials (AREA)
- Aerials With Secondary Devices (AREA)
- Laminated Bodies (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/596,575 US7446730B2 (en) | 2004-05-18 | 2005-03-09 | Radio wave device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004148359A JP3845426B2 (ja) | 2004-05-18 | 2004-05-18 | 電波装置 |
JP2004-148359 | 2004-05-18 |
Publications (1)
Publication Number | Publication Date |
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WO2005112189A1 true WO2005112189A1 (ja) | 2005-11-24 |
Family
ID=35394456
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/004108 WO2005112189A1 (ja) | 2004-05-18 | 2005-03-09 | 電波装置 |
Country Status (3)
Country | Link |
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US (1) | US7446730B2 (ja) |
JP (1) | JP3845426B2 (ja) |
WO (1) | WO2005112189A1 (ja) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4999085B2 (ja) * | 2007-06-15 | 2012-08-15 | 国立大学法人電気通信大学 | スマートアンテナ |
US8185166B2 (en) * | 2008-10-24 | 2012-05-22 | Apple Inc. | Thermal spray coating for seamless and radio-transparent electronic device housing |
JP2009141983A (ja) * | 2009-02-10 | 2009-06-25 | Electronic Navigation Research Institute | 全方向性を有する誘電体レンズを用いたアンテナ装置。 |
JP4919179B2 (ja) * | 2010-05-11 | 2012-04-18 | 独立行政法人電子航法研究所 | ミリ波レーダ組み込み型ヘッドランプ |
JP2011196012A (ja) * | 2011-06-07 | 2011-10-06 | Electronic Navigation Research Institute | 複合材及びその製造方法とこの複合材を用いた装置 |
US9583822B2 (en) | 2013-10-30 | 2017-02-28 | Commscope Technologies Llc | Broad band radome for microwave antenna |
US9985347B2 (en) | 2013-10-30 | 2018-05-29 | Commscope Technologies Llc | Broad band radome for microwave antenna |
JP7240005B2 (ja) | 2018-03-06 | 2023-03-15 | 直文 竹本 | 保護材および無線通信装置 |
TWI820512B (zh) * | 2021-11-10 | 2023-11-01 | 位元奈米科技股份有限公司 | 電容感應辨識標籤 |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50116259A (ja) * | 1974-02-26 | 1975-09-11 | ||
JPS60149223U (ja) * | 1984-03-14 | 1985-10-03 | 株式会社トキメック | スロツト・アレイ・アンテナ装置 |
JPS61128808U (ja) * | 1985-01-31 | 1986-08-12 | ||
JPH0419815U (ja) * | 1990-05-31 | 1992-02-19 | ||
JPH0548415U (ja) * | 1991-11-26 | 1993-06-25 | 日立化成工業株式会社 | 平面アンテナ |
JP2003229712A (ja) * | 2002-01-31 | 2003-08-15 | Kanazawa Inst Of Technology | 多層レードーム板およびその製造方法 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4980696A (en) * | 1987-05-12 | 1990-12-25 | Sippican Ocean Systems, Inc. | Radome for enclosing a microwave antenna |
US5384458A (en) * | 1992-09-30 | 1995-01-24 | The United States Of America As Represented By The Secretary Of The Navy | Photonic electromagnetic field sensor for use in a missile |
WO2004082073A1 (ja) * | 1992-12-18 | 2004-09-23 | Naohisa Goto | 偏波共用ラジアルラインスロットアンテナ |
JP3566598B2 (ja) | 1999-09-30 | 2004-09-15 | 株式会社東芝 | アンテナ装置 |
-
2004
- 2004-05-18 JP JP2004148359A patent/JP3845426B2/ja not_active Expired - Fee Related
-
2005
- 2005-03-09 US US11/596,575 patent/US7446730B2/en active Active
- 2005-03-09 WO PCT/JP2005/004108 patent/WO2005112189A1/ja active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS50116259A (ja) * | 1974-02-26 | 1975-09-11 | ||
JPS60149223U (ja) * | 1984-03-14 | 1985-10-03 | 株式会社トキメック | スロツト・アレイ・アンテナ装置 |
JPS61128808U (ja) * | 1985-01-31 | 1986-08-12 | ||
JPH0419815U (ja) * | 1990-05-31 | 1992-02-19 | ||
JPH0548415U (ja) * | 1991-11-26 | 1993-06-25 | 日立化成工業株式会社 | 平面アンテナ |
JP2003229712A (ja) * | 2002-01-31 | 2003-08-15 | Kanazawa Inst Of Technology | 多層レードーム板およびその製造方法 |
Also Published As
Publication number | Publication date |
---|---|
JP2005333273A (ja) | 2005-12-02 |
JP3845426B2 (ja) | 2006-11-15 |
US20070252776A1 (en) | 2007-11-01 |
US7446730B2 (en) | 2008-11-04 |
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