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WO2003077363A1 - Radome - Google Patents

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Publication number
WO2003077363A1
WO2003077363A1 PCT/JP2003/002895 JP0302895W WO03077363A1 WO 2003077363 A1 WO2003077363 A1 WO 2003077363A1 JP 0302895 W JP0302895 W JP 0302895W WO 03077363 A1 WO03077363 A1 WO 03077363A1
Authority
WO
WIPO (PCT)
Prior art keywords
antenna cover
sheet
resin
group
cover according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2003/002895
Other languages
English (en)
Japanese (ja)
Inventor
Katsusada Tokuhira
Yasuhiko Sawada
Hiroyuki Yoshimoto
Shunji Kasai
Shinichi Yano
Sigehito Sagisaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daikin Industries Ltd filed Critical Daikin Industries Ltd
Priority to JP2003575459A priority Critical patent/JPWO2003077363A1/ja
Publication of WO2003077363A1 publication Critical patent/WO2003077363A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to an antenna cover. More specifically, it relates to an antenna cover of an antenna used for a mobile phone base station and the like. Background art
  • Mobile phone base station antennas are installed on the roofs of high-rise buildings such as condominiums in urban areas.
  • the antenna elements are formed by etching copper foil on both sides of a low dielectric loss resin substrate. .
  • a cyanate resin is used in terms of moldability, adhesiveness, and price.
  • the electrical properties, tan ⁇ 5 is about 1 0 3, life is said to be 1 five years.
  • the antenna since the antenna is installed outdoors, it is exposed to rain, snow, dust and the like. In particular, if water adheres to the antenna, there is a problem that transmission loss due to water occurs and diffusion of electromagnetic waves occurs.
  • antennas used outdoors are protected by antenna covers.
  • the antenna cover is required to have excellent electric characteristics such as low dielectric constant and low ta ⁇ ⁇ .
  • An object of the present invention is to solve the above-mentioned problems, and to provide an antenna cover having excellent electric characteristics such as low dielectric constant and low t an. Disclosure of the invention
  • the present invention relates to an antenna cover comprising a polytetrafluoroethylene-based resin sheet, wherein the polytetrafluoroethylene-based resin has a dielectric loss tangent calculated by the following condition (1): 2.0 X 1
  • the present invention relates to an antenna cover which is a polytetrafluoroethylene resin of 0 to 4 or less.
  • Polytetrafluoroethylene resin powder is compression-molded into a cylindrical shape.
  • a 0.5 mm-thick sheet cut out of the cylinder is heated and baked at 38 ° C. for 5 minutes in a hot-air circulation type electric furnace. Then, it is allowed to cool to room temperature at a cooling rate of 60 ° CZ time to prepare a sample sheet. (Dielectric loss tangent measurement method)
  • R s Effective surface resistance ( ⁇ ) taking into account the surface roughness of the conductor cavity
  • the dielectric loss tangent is preferably 1. It 5 0 X 1 0- 4 below.
  • the standard specific gravity of the polytetrafluoroethylene resin is preferably 2.192 or more.
  • the specific gravity of the sheet is preferably 2.192 or more.
  • the sheet is preferably unfired or has a crystal conversion of 90% or less.
  • the terminal group of the polytetrafluoroethylene resin is preferably fluorinated.
  • a metal foil is adhered to the sheet by heat fusion. After the surface treatment of the sheet, it is preferable to heat-bond the sheet.
  • the sheet and the metal foil are each formed of at least one resin adhesive selected from the group consisting of an epoxy resin, a phenol resin, and a silane resin; and Z or a hydroxyl group, a carboxylic acid group, a carboxylate, a carboxyester group. It is preferable that the adhesive be applied via a fluorine-containing ethylenic polymer having at least one functional group selected from the group consisting of epoxy group and epoxy group.
  • the sheet and the metal foil are adhered via a resin adhesive after the sheet is subjected to a surface treatment.
  • the surface treatment includes (a) discharge treatment in an inert gas atmosphere containing an organic compound having a functional group, (mouth) excimer laser irradiation, (c) plasma treatment, or (ii) chemical treatment using metallic sodium. It is preferable that the etching process be performed.
  • the present invention has a dielectric loss tangent at 1 2 GH z measured in (A) above condition (1) is at 1. 5 X 1 0- 4 or less, Ru der standard specific gravity of 2.1 9 2 or more poly tetrafluoropropoxy O b ethylene-based resin powder, and Roh or (B) 3 8 0 melt viscosity at ° C is less than 1 0 6 Boise polytetramethylene full O Roe Chile emission resin powder composition comprising 1 0% by weight or more
  • the present invention relates to an antenna cover in which a metal foil is adhered to at least one surface of a sheet made of an object.
  • the composition comprises a cyanate resin.
  • the terminal group of the polytetrafluoroethylene resin is preferably fluorinated.
  • the metal foil is preferably a stainless steel foil or an aluminum foil.
  • the sheet and the metal foil are each formed of at least one resin adhesive selected from the group consisting of an epoxy resin, a phenol resin, and a silicate resin, and z or a hydroxyl group, a hydroxyl group, a carboxylate, and a carboxy ester. It is preferable that the adhesive be applied via a fluorine-containing ethylenic polymer having at least one functional group selected from the group consisting of a group and an epoxy group. It is preferable that the sheet is formed and then obtained by bonding a metal foil. It is preferable that the sheet and the metal foil are adhered and then formed by heat treatment.
  • the present invention comprises a sheet using a polytetrafluoroethylene resin
  • FIG. 1 is a diagram showing an example of an antenna cover according to the present invention.
  • (A) is a perspective view
  • (b) is a cross-sectional view taken along line AA.
  • FIG. 2 is a diagram showing an example of the antenna cover of the present invention.
  • (A) is a perspective view
  • (b) is a cross-sectional view taken along line BB.
  • FIG. 3 is a diagram showing an example of the antenna cover of the present invention.
  • (A) is a perspective view, and (b) is a cross-sectional view taken along line C-C.
  • FIG. 4 is a diagram showing an example of the antenna cover of the present invention. This is an example in which the antenna element and the reflector are directly coated. BEST MODE FOR CARRYING OUT THE INVENTION
  • the polytetrafluoroethylene resin (hereinafter referred to as a PTFE resin) used in the present invention is a homopolymer of tetrafluoroethylene (TFE) or tetrafluoroethylene 99.9 to 99.9. 9.9 9 9 9 mol% and the formula ( I):
  • X, Y and z are the same or different and are all hydrogen atoms or fluorine atoms, n is an integer of 1 to 5).
  • Rf 1 is a perfluoroalkyl group having 1 to 3 carbon atoms, wherein at least one monomer selected from the group consisting of perfluoro (alkyl biether)
  • a modified polytetrafluoroethylene having a modification amount of 0.1% by weight or less as a copolymer with 0.1 mol% is preferred.
  • fluorofluorin represented by the above formula (I) examples include, for example, verfluoroolefin such as hexafluoropropylene (hereinafter abbreviated as HFP); and fluorofluorin such as perfluorobutylethylene. And so on. Of these, HFP is preferred because of its excellent electrical properties.
  • the perfluoro (alkyl vinyl ether) represented by the formula (II) includes perfluoro (methyl vinyl ether) (hereinafter abbreviated as PMVE), perfluoro (ethyl vinyl ether) (hereinafter abbreviated as PEVE), Perfluoro (propyl vinyl ether) (hereinafter abbreviated as PP VE). Of these, PMVE is preferred because of its excellent electrical properties.
  • Examples of the shape of the PTFE resin used in the present invention include molding powders, fine powders, and aqueous dispersions.
  • the fine powder is obtained by emulsion-dispersion polymerization using a polymerization initiator in the presence of an emulsifier, particularly a fluorinated emulsifier.
  • an emulsifier particularly a fluorinated emulsifier.
  • the amount of the polymerization initiator must be reduced. Increasing, adding a chain transfer agent, adding a modified monomer, etc. are adopted.
  • polymerization initiator examples include ammonium persulfate (APS) and disuccinic acid peroxide (DSP), and examples of the chain transfer agent include hydrocarbons such as hydrogen, methane, and ethane.
  • APS ammonium persulfate
  • DSP disuccinic acid peroxide
  • chain transfer agent examples include hydrocarbons such as hydrogen, methane, and ethane.
  • the method of emulsion polymerization is not particularly limited, and a known method may be used.
  • the colloid-secondary particles obtained by the emulsion polymerization method into a core-shell structure, moldability, particularly paste extrudability, can be improved.
  • the core-shell structure for example, a core composed of a homopolymer of PTFE and a shell composed of a modified PTFE is preferred in terms of good paste extrusion moldability.
  • the molding powder is obtained by suspension polymerization using a polymerization initiator in the presence of a dispersant.
  • polymerization initiator examples include persulfates and sulfites, and for example, ammonium persulfate and the like.
  • the suspension polymerization method is not particularly limited, and a known method may be used.
  • the aqueous dispersion obtained by the emulsion polymerization can be used as it is, but a surfactant is added in order to increase the concentration of the fluoropolymer and improve the stability. And then concentrated to a polymer solids concentration of 40 to 70% by weight using a layer separation concentration method or a membrane separation concentration method, and then purified water, ammonia water and polyoxyethylene alkyl ether. It is preferable to add a tellurium-based surfactant and dilute the solution to 30 to 65% by weight.
  • R is a linear or branched alkyl group having 5 to 18 carbon atoms, preferably 10 to 16 carbon atoms, and A is 5 to 20 oxyethylene groups and Which is a polyoxyalkylene chain having 0 to 6 pyrene groups).
  • alkyl group R include decyl, lauryl, tridecyl, cetyl, stearyl and the like, and may be linear or branched.
  • R is an alkyl group having 10 to 16 carbon atoms and polyoxyalkylene chain, because of its excellent surface activity, water solubility, and availability.
  • a polyoxyalkylene alkyl ether surfactant comprising from 15 to 15 oxyethylene groups and 0 to 3 oxypropylene groups is preferred.
  • a raw material for producing this surfactant a natural or synthetic higher alcohol may be used, but it is preferable that it does not contain any alkylphenols.
  • the addition amount of the polyoxyalkylene alkyl ether-based surfactant is preferably 3 to 20 parts per 100 parts by weight of the PTFE-based resin (hereinafter, referred to as “parts”).
  • pure water, a water-soluble solvent, or various types of hydrocarbon-based surfactants not containing alkylphenol may be appropriately added, and a fluorine-based surfactant or a silicon-based surfactant may be used as a repelling agent.
  • the viscosity may be adjusted by adding an activator, or by using a thickener, a rheology control agent, or a salt containing various water-soluble electrolytes.
  • the standard specific gravity of the PTFE-based resin is preferably at least 2.192. More preferably, it is at least 2.200.
  • the upper limit is 2.300, preferably 2.280.
  • PTFE resin with a standard specific gravity of 2.300 is completely crystallized and does not actually exist. That is, the PTFE-based resin used in the present invention preferably has a high degree of crystallinity. If the standard specific gravity is smaller than 2.192, the crystallinity tends to be low, and the t an ⁇ 5 of the sheet tends to be high, or the formability tends to be poor. On the other hand, if the standard specific gravity is high, there is a problem in that the mechanical strength decreases.
  • the standard specific gravity was measured at a temperature of 25 ° C. In this method, the density of the sample (ps) is determined from the difference between the weight of the sample in air (W1) and the weight of the sample in water (W2).
  • the molecular weight of the PTFE resin satisfying the standard specific gravity is considered to be 5,000,000 or less, and in the present invention, such a low molecular weight PTFE resin is preferably used.
  • the terminal unstable group by subjecting the PTFE-based resin to a fluorination treatment by contacting the PTFE resin with a fluorine radical source.
  • a fluorination treatment by contacting the PTFE resin with a fluorine radical source.
  • the reaction temperature of the fluorination treatment is preferably from 100 to 250 ° C, more preferably from 110 to 200 ° C. If the reaction temperature is lower than 100 ° C, the reaction rate tends to be slow. If the reaction temperature exceeds 250 ° C, the PTFE resins tend to fuse or decompose and volatilize.
  • fluorine radical source in addition to fluorine gas, halogenated fluorides such as C 1 F, C 1 F 3 Br F 3 and IF 3 ; rare gases such as Xe F 2 , Xe F 4 and Kr F 2 Compounds that are gaseous at the above-mentioned reaction temperature, such as nitrogen-containing fluorine compounds such as NF 3 and NF 2 . Among them, fluorine gas is most preferable in terms of handling properties and price.
  • Perform fluorination treatment using fluorine gas In this case, the PTFE resin is brought into contact with fluorine gas at 110 to 250 ° C for 1 to 10 hours.
  • the reaction temperature is 180 to 230 ° C.
  • the reaction time is preferably 2 to 5 hours.
  • the reaction pressure may be about 0.1 to 1 MPa, preferably atmospheric pressure.
  • the fluorine gas may be pure fluorine gas, or may be diluted with an inert gas such as a nitrogen gas, an argon gas or a helium gas to a concentration of 5 to 25% by volume, preferably 7 to 20% by volume.
  • the addition amount of the fluorine radical source varies depending on the reaction temperature, reaction time, type of the fluorine radical source, etc., but is preferably 0.01 to 1 part in terms of fluorine atoms, based on 100 parts of the PTFE-based resin. . More preferably, it is 0.1 to 0.5 part.
  • the fluorination of the raw material PTFE tends to be insufficient. Also, if the amount of the fluorine radical source exceeds 1 part, the effect of fluorination does not improve and tends to be uneconomical.
  • any apparatus that can sufficiently perform solid-at-a-time contact can be used without any problem.
  • Specific examples include a fluidized bed type and a tray type solid-batch contact reactor.
  • 1 t an, at 2 GHz [delta] is 2. 0 X 1 0- 4 indicates less, and preferably 1. is 5 X 1 0- 4 below.
  • tan 3 exceeds 2.
  • OX 1 0 one 4 the dielectric loss of the antenna cover (power loss) is increased.
  • a sample is prepared and measured under the following condition (1).
  • Polytetrafluoroethylene is compression molded into a cylindrical shape.
  • a 0.5 mm-thick sheet cut from this cylinder was heated at 380 ° C for 5 minutes in a hot air circulation type electric furnace. Heat and bake. Then, let it cool to room temperature at a cooling rate of 60 ° C / hr.
  • the PTFE resin is an aqueous dispersion
  • the resonance frequency changes depending on the sample, and the The value of the resonance frequency is about 11.74 GHz for a 500-meter thick PTFE sample, where tan (5 is used for the unsampled resonance frequency.
  • F! Upper frequency (Hz) where the attenuation from the resonance point is 3 dB
  • F 2 Lower frequency (Hz) at which the attenuation from the resonance point is 3 dB
  • the PTFE-based resin sheet used for the antenna cover of the present invention includes not only a sheet having a thickness of 200 m or more, but also a film having a thickness of less than 200 m.
  • an antenna cover in which a sheet made of PTFE-based resin is located away from the antenna element or the reflector, or an antenna in which a sheet made of PTFE-based resin is directly coated on the antenna element and the reflector refers to a cover.
  • the three-dimensional shape is not particularly limited, such as a cylindrical shape, a polygonal shape, and a conical shape.
  • the thickness of the antenna cover is not particularly limited, but is preferably 1 to 6 mm. If it is smaller than 1 mm, mechanical strength tends to be insufficient.
  • the thickness of the antenna cover is preferably 5 to 50 / m. If the film thickness is less than, the water repellency tends to decrease. If the film thickness exceeds 50 m, cracks are generated, water seeps, and the water repellency tends to decrease.
  • the antenna cover of the present invention comprises the PTFE-based resin sheet,
  • the weight is preferably at least 2.192. More preferably, it is at least 2.200.
  • the upper limit is 2.300, preferably 2.280. If the specific gravity is less than 2.192, the crystallinity will be low, t an ⁇ 5 will be high, and the formability will be poor. On the other hand, if the standard specific gravity is high, there is a problem in that the mechanical strength decreases.
  • the sheet preferably contains 20% by weight or more, and more preferably 70% by weight or more of the PTFE-based resin having a standard specific gravity of 2.192 or more.
  • the present invention is prepared by (A) The condition (1), measured 12 GHz to definitive t an, [delta] is 1. is a 5 X 10- 4 or less, the standard specific gravity 2. is the 192 or more Boritetora Fluoroethylene-based resin powder, and / or ( ⁇ ) 38 O: Melt viscosity at 38 O: is less than 10 6 % by volume. More particularly, the present invention relates to an antenna cover having a metal foil adhered to one side.
  • the polytetramethylene full O b ethylene resin powder (A), the condition (1) in work made, t an, S is the measured 12 GHz 1. is a 5X 10 4 or less, preferably, 1. 0 X 10- 4 It is as follows. Outside this range, dielectric loss tends to increase.
  • polytetramethylene full O b ethylene resin powder (B) is contact Keru melt viscosity 380 ° C is 10 6 Boise less, preferably 10 5 Boise below. If the melt viscosity exceeds 10 6 boise, the dielectric loss tends to increase during fabrication under slow cooling conditions.
  • the slow cooling condition may be such that, for example, the cooling rate after firing is lower than 60 ° C./hour.
  • the polytetrafluoroethylene-based resin powder (A) and / or the polytetrafluoroethylene-based resin powder (B) is 10% by weight of the sheet. More preferably, it is preferable to contain more than 30% by weight. If the content of the polytetrafluoroethylene resin powder is less than 10% by weight, the effect of reducing the dielectric loss tends to be hardly obtained.
  • composition in terms of low dielectric loss tangent at slow cooling molding preferably comprises a melt viscosity 1 0 6 Boise following PTFE resin, in view further of low loss, end groups are fluorinated It is preferable to include a polytetrafluoroethylene resin.
  • the present invention also relates to an antenna cover using a sheet made of a PTFE resin.
  • the PTFE-based resin used in the present invention cannot be melt-processed, it is molded by a molding method such as a press molding method, an extrusion method such as sheet or tube (pipe) extrusion, or a compression molding method.
  • the obtained molded product is usually subsequently fired.
  • the firing temperature is suitably from 360 to 400 ° C.
  • the above-mentioned baking may not be performed, and the baking may be partially performed to a crystal conversion ratio of 90% or less. Unsintered and semi-sintered with a crystal conversion ratio of 90% or less tend to reduce dielectric loss.
  • a sheet-like molded body made of a PTFE-based resin is obtained by pressing, paste extrusion, skiving, or the like.
  • the antenna cover of the present invention can be obtained by forming the obtained flat molded body into a three-dimensional shape by hot pressing or tube extrusion.
  • the antenna element and the antenna reflector are spray-coated with a water-soluble dispersion to obtain a 3 to 20 After drying for a minute, baking is preferably performed.
  • An appropriate firing temperature is 360 to 400 ° C.
  • the antenna cover used in the present invention thus obtained has excellent electrical characteristics in the microwave region (3 to 30 GHz), particularly in the high frequency region. 10_ 4 or less, preferably 1. 5 0 X 1 0 one 4 below. t an, ⁇ 5 is more than 2. 0 X 1 0- 4, there is a tendency that the dielectric loss increases.
  • Antenna covers and their peripheral devices are required to keep transmission loss low. Then, the transmission loss is obtained by the following equation.
  • ta eta [delta] of the antenna cover of the present invention 1. is reduced to 50 X 1 0 one 4 or less, it is possible to significantly reduce the transmission loss. Further, since the antenna cover of the present invention is made of a fluororesin, it repels moisture such as rain and snow. As a result, the center frequency of the transmitting and receiving antennas is less likely to shift due to moisture, and stable receiving and transmitting performance can be obtained.
  • a metal foil is adhered to at least one surface of the sheet from the viewpoint of fixing.
  • the thickness of the metal foil is not particularly limited, but is preferably 0.05 to 1.0 Omm.
  • the metal foil be bonded to the sheet surface by heat fusion after the surface treatment of the sheet or without the surface treatment.
  • the metal foil may have at least one selected from the group consisting of an epoxy resin, a phenol resin, and a cyanate resin on the sheet surface after or without surface treatment of the sheet.
  • Fluorinated ethylenic polymer having at least one functional group selected from the group consisting of a resin binder, and z or a hydroxyl group, a hydroxyl group, a carboxylate, a carboxylester group, and an epoxy group. It is preferable that they are adhered through a gap.
  • the three types of adhesives composed of the epoxy resin, the phenolic resin, and the skeleton resin and the fluorine-containing ethylenic polymer having a functional group may be used alone, but two or more types may be used, and two or more layers may be used. May be used as an adhesive layer.
  • a two-layer adhesive layer composed of a fluorine-containing ethylenic polymer layer having a functional group and an epoxy resin layer may be used.
  • one layer of a resin adhesive one layer of a fluorinated ethylene polymer having a functional group, or two layers of a resin adhesive and a fluorinated ethylene polymer having a functional group are used. It means that it is adhered through.
  • the point of easy adhesion and the strength of adhesion to metal is possible because the adhesive strength does not decrease even under severe temperature changes or high temperatures.
  • the fluorocarbon resin has a main chain, it has excellent weather resistance, has a long outdoor life, and is unlikely to cause dielectric loss.
  • Hydroxy group, carboxyl group, carboxylate, carboxylate group and epoxy group Preferred is a fluorine-containing ethylenic polymer having at least one functional group selected from the group consisting of:
  • the functional group-containing fluoroethylenic polymer includes: (a) a functional group having at least one type of functional group selected from the group consisting of a hydroxyl group, a hydroxyl group, a carboxylate, a hydroxyl group, and an epoxy group; And (b) a fluorine-containing ethylenic monomer having no functional group. It is preferably a copolymer with at least one of the monomers.
  • the content of the component (a) is preferably 0.05 to 30 mol%.
  • the type, shape, purpose, application, required adhesive strength, adhesive form, and adhesive method of the substrate to be bonded are described. Although it is appropriately selected depending on the difference between them, it is more preferably 0. 05 to 20 mol%, particularly preferably 0.1 to 10 mol%. When the content is less than 0.05 mol%, it is difficult to obtain sufficient adhesion to other base materials, and peeling due to chemical permeation or temperature change is caused.
  • the content exceeds 30 mol%, the heat resistance is reduced, and peeling, coloring, foaming, and elution are likely to occur due to poor adhesion, coloring and foaming at the time of processing at high temperatures, and decomposition during use at high temperatures.
  • X and X 1 are the same or different and are each a hydrogen atom or a fluorine atom
  • Y is — CH 2 OH, monoCOOH, carboxylate, carboxyester group or epoxy group
  • a divalent fluorinated alkylene group having 1 to 40 carbon atoms, a divalent fluorinated oxyalkylene group having 1 to 40 carbon atoms, a fluorinated alkylene group containing a 1 to 40 carbon ether group, or 1 to 40 carbon atoms Represents a fluorine-containing oxyalkylene group containing 40 ether groups
  • CF 2 CF-R f 3 _CH 2 ⁇ H (2)
  • ⁇ is a divalent fluorine-containing alkylene group or a OR f 4 (R f 4 is a divalent fluorine-containing alkylene group or an ether having a carbon number of 1 to 40 1 to 40 carbon atoms from 1 to 40 carbon atoms A divalent fluorine-containing alkylene group containing a bond)],
  • one R f 5 is a divalent fluorinated alkylene group having 1 to 39 carbon atoms or Represents a divalent fluorinated alkylene group having an ether bond having 1 to 39 carbon atoms]
  • R f 6 is a divalent fluorine-containing alkylene group having 1 to 39 carbon atoms, or an ⁇ _R f 7 (R f 7 is a divalent fluorine-containing alkylene group having 1 to 39 carbon atoms, or Or a divalent alkylene group containing an ether bond having 1 to 39 carbon atoms)]
  • R f 7 is a divalent fluorine-containing alkylene group having 1 to 39 carbon atoms, or Or a divalent alkylene group containing an ether bond having 1 to 39 carbon atoms
  • ⁇ represents a divalent fluorine-containing alkylene group having 1 to 40 carbon atoms
  • X and X 1 are the same or different and are each a hydrogen atom or a fluorine atom
  • Y 1 is a hydrogen atom
  • R f 9 is a carbon atom.
  • one COOY 1 is preferably —COOH, one COONH 4 , one COONa, -COOK, one COOL i, _COOZn, one COOAl, one COOMg, one COOCa, and the like.
  • Examples of the fluorine-containing ethylenic monomer having no functional group (b) include tetrafluoroethylene or tetrafluoroethylene of 85 to 99.7 mol%.
  • R f 1Q is CF 3 or OR 11 (R 1 is a perfluoroalkyl group having 1 to 5 carbon atoms)
  • a mixed monomer of 0.3 to 15 mol%.
  • a surface treatment such as a sodium etching, a plasma treatment, an excimer laser treatment, and a discharge treatment, and then the epoxy resin is applied.
  • the coating amounts of the fluorine-containing ethylenic polymer having a functional group and the adhesive are not particularly limited, but are preferably 0.004 to 0.04 g Zcm 2 . If it is less than 0.004 g / cm 2 , the adhesive strength tends to be insufficient. If it exceeds 0.04 g Z cm 2 , the transmission loss tends to increase. Further, an adhesive in a film form may be applied to the sheet in advance. At this time, the thickness of the film is preferably in the range of 0.2 to 0.2 mm. If it is smaller than 0.02 mm, the adhesive strength tends to be insufficient. If it exceeds 0.2 mm, transmission loss tends to increase.
  • the form of the adhesive is not limited to a film, but may be used as a powder or a dispersion.
  • the surface treatment may be performed in the following manner from the viewpoint of adhesive strength: (a) discharge treatment in an inert gas atmosphere containing an organic compound having a functional group, (mouth) excimer laser irradiation, (8) plasma treatment, or ( 2) Chemical etching using metallic sodium is preferred.
  • the antenna cover of the present invention can be bonded to an antenna, a metal reflector, or the like with the adhesive.
  • FIGS. 1-10 An example of the antenna cover of the present invention is shown in FIGS.
  • a metal reflector 2 to which an antenna 3 is bonded is bonded to an antenna cover 1 via an adhesive 4.
  • the entire metal reflector is protected by the antenna cover of the present invention.
  • the sheet may be formed and then the metal foil may be bonded, or the sheet and the metal foil may be bonded and then heat-treated.
  • the three sides surrounding the antenna 3 and the upper part are protected by the antenna cover 1.
  • the other side is a metal reflector 2 to which the antenna 3 is joined.
  • the antenna cover 1 and the metal reflector 2 are adhered by an adhesive 4.
  • the antenna 3 and the hemispherical metal reflector 2 joined to the antenna 3 are coated with the antenna cover 1.
  • the raw material containing polytetrafluoroethylene finer is compression molded into a cylindrical shape.
  • a sheet with a thickness of 0.5 mm cut from this cylinder is circulated with hot air. Bake at 38 O for 5 minutes in an electric furnace. Then, it is allowed to cool to room temperature at a cooling rate of 60 ° C / hour to produce a sample sheet.
  • the PTFE resin is an aqueous dispurgeon, it must be heated at 8 before compression molding to evaporate the water and form a powder. (t an (5 measurement methods)
  • Wi —xs r xe ri xL rx X Un XJi XJn 1+
  • H. Vacuum permeability (HZm)
  • Example 1 17% by weight of Isopar G (manufactured by Etsuso Chemical Co., Ltd.) as an extrusion aid was mixed with the same PTFE fine powder as in Example 1.
  • the extruder was used to form a pipe with an outer diameter of 120 mm and an inner diameter of 116 mm.
  • the pipe was flattened by a flat press at room temperature and dried at 100 ° C. for 10 minutes. Then, the extruder was heated at 250 ° C. for 10 minutes in a dryer to remove the extrusion aid, and a film having a thickness of 1.7 mm was obtained.
  • the resulting film was pressed with a hot plate press at 360 ° C. at a pressure of 50 kgZcm 3 for 10 minutes.
  • Standard specific gravity of 2.1 7 the condition (1) as measured by the tan ⁇ 5 is 1.
  • 9 X 1 0- 4 of the PTFE fine powder (Daikin Industries, Ltd., TFE homopolymer, trade name: Polyflon F 104), and the melt viscosity (380 ° C, 7 kg load, nozzle diameter 10 mm ⁇ ) is 350,000 Voids PTFE Fine Powder I (manufactured by Daikin Industries, Ltd., TFE polymer, trade name: Lubron L-1 2) )
  • Were mixed in a room temperature air at a weight ratio of 8: 2 Were mixed in a room temperature air at a weight ratio of 8: 2, and compression-molded into a cylindrical shape by a compression molding machine.
  • the molded product was fired and heated in a hot air circulation type electric furnace at 380 for 60 minutes, gradually cooled to 270 ° C. at a cooling rate of 1 ° C.Z, and allowed to cool to room temperature.
  • a sheet (film) having a thickness of 2 mm was cut out from the cylinder.
  • An antenna cover (2 mm thick) was obtained from the obtained film in the same manner as in Example 1. Measurement of the t an, [delta], is 1. 4X 10- 4, specific gravity, 2. was 22.
  • Standard specific gravity of 2. is 25, the condition (1) was measured at a t an ⁇ is 1. 4 ⁇ 10- 4 of the PTFE fine powder (Daikin Industries, Ltd., TF ⁇ -based polymer, trade name: LeBron L- 2 ) was placed in an electric furnace and brought into contact with a fluorine radical source (fluorine gas) at 200 ° C under atmospheric pressure for 5 hours to obtain a fluorinated PTFE fine powder.
  • a fluorine radical source fluorine gas
  • a PTFE fine powder having a standard specific gravity of 2.17 manufactured by Daikin Industries, Ltd., TFE homopolymer, trade name: BORIFLON F104
  • the fluorinated PTFE fine powder in a weight ratio of 9: 1 They were mixed in room temperature air and compression-molded into a cylindrical shape using a compression molding machine.
  • the molded product was heated and fired at 380 ° C. for 60 minutes in a hot-air circulation electric furnace, gradually cooled to 270 ° C. at a cooling rate of lZ hours, and allowed to cool to room temperature.
  • a 1.5 mm-thick sheet (film) was cut out from the cylinder, and an antenna cover (1.5 mm in thickness) was obtained in the same manner as in Example 1.
  • tan (5 were measured, 1. a 3 X 10_ 4, specific gravity, 2. was 25.
  • An antenna cover (thickness 1) was prepared in the same manner as in Example 1 except that PTFE fine powder 1 (standardized specific gravity: 2.17, TFE homopolymer, manufactured by Daikin Industries, Ltd., trade name: Polyflon F104) was used. .5mm). Measurement of the ta eta [delta], 1. a 6 X 10_ 4, specific gravity, 2.19 Met.
  • Aqueous dispurgeon (manufactured by Daikin Industries, Ltd., trade name: D-2, solid content standard specific gravity: 2.22) was heated at 80 ° C to evaporate water to form a padder, and the conditions (1 ) in was 1. 7 X 10- 4 was measured tan ⁇ 5. This aqueous dispurgeon is spray-coated on an antenna reflector, dried for 30 minutes, baked at 38 O for 30 minutes, gradually cooled to 27 at a cooling rate of 1 ° C / min, and allowed to cool to room temperature. An antenna reflector with an antenna cover (20 m thick) was obtained. When the ta ⁇ ⁇ of the sheet was measured, it was 1.0 ⁇ 10-4, and the specific gravity was 2.26.
  • the powder was used as a substitute for t an ⁇ of a sheet produced by the following method.
  • the powder obtained by evaporating the water is compression-molded into a cylindrical shape, a sheet having a thickness of 0.5 mm is cut out, and then calcined at 380 ° C for 5 minutes.
  • the sheet was slowly cooled down to, and allowed to cool to room temperature to prepare a sheet.

Landscapes

  • Laminated Bodies (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

L'invention concerne un radôme fabriqué à partir d'une feuille de résine à base de polytétrafluoroéthylène. La résine à base de polytétrafluoroéthylène possède un facteur de dissipation diélectrique, mesuré à l'aide d'une technique et dans des conditions spécifiées dans le descriptif de la présente demande, inférieur ou égal à 2,0 X 10-4 et, de préférence, inférieur ou égal à 1,50 X 10-4. La résine à base de polytétrafluoroéthylène a, de préférence, une densité ordinaire supérieure ou égale à 2,192. La résine à base de polytétrafluoroéthylène a d'excellentes caractéristiques électriques, ce qui permet d'obtenir un radôme à faible perte diélectrique, y compris dans une région haute fréquence.
PCT/JP2003/002895 2002-03-13 2003-03-12 Radome Ceased WO2003077363A1 (fr)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003273630A (ja) * 2002-03-13 2003-09-26 Daikin Ind Ltd アンテナ素子
JP2009242710A (ja) * 2008-03-31 2009-10-22 Daikin Ind Ltd ポリテトラフルオロエチレンの成形体、混合粉末及び成形体の製造方法
JP2010013520A (ja) * 2008-07-02 2010-01-21 Daikin Ind Ltd ポリテトラフルオロエチレンの成形体、混合粉末及び成形体の製造方法
WO2016159314A1 (fr) * 2015-03-31 2016-10-06 ダイキン工業株式会社 Trajet guide d'onde diélectrique
CN108481763A (zh) * 2018-03-27 2018-09-04 中国人民解放军国防科技大学 一种宽频透波低介电天线罩材料及其快速制备方法
CN112004610A (zh) * 2018-04-26 2020-11-27 Ａｇｃ株式会社 层叠体的制造方法及层叠体
JPWO2019156071A1 (ja) * 2018-02-07 2020-12-03 ダイキン工業株式会社 低分子量ポリテトラフルオロエチレンを含む組成物の製造方法
JP2023501048A (ja) * 2019-09-17 2023-01-18 グジャラート フルオロケミカルズ リミテッド 低分子量ポリテトラフルオロエチレン微粉末及びその調製方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08181531A (ja) * 1994-12-26 1996-07-12 Toyo Commun Equip Co Ltd レドーム付きスロット結合マイクロストリップアンテナ
JPH11181128A (ja) * 1997-12-24 1999-07-06 Hitachi Cable Ltd 光透過性低屈折率ふっ素樹脂成形体
JP2001196841A (ja) * 2000-01-07 2001-07-19 Anritsu Corp 平面アンテナ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08181531A (ja) * 1994-12-26 1996-07-12 Toyo Commun Equip Co Ltd レドーム付きスロット結合マイクロストリップアンテナ
JPH11181128A (ja) * 1997-12-24 1999-07-06 Hitachi Cable Ltd 光透過性低屈折率ふっ素樹脂成形体
JP2001196841A (ja) * 2000-01-07 2001-07-19 Anritsu Corp 平面アンテナ

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003273630A (ja) * 2002-03-13 2003-09-26 Daikin Ind Ltd アンテナ素子
JP2009242710A (ja) * 2008-03-31 2009-10-22 Daikin Ind Ltd ポリテトラフルオロエチレンの成形体、混合粉末及び成形体の製造方法
JP2010013520A (ja) * 2008-07-02 2010-01-21 Daikin Ind Ltd ポリテトラフルオロエチレンの成形体、混合粉末及び成形体の製造方法
WO2016159314A1 (fr) * 2015-03-31 2016-10-06 ダイキン工業株式会社 Trajet guide d'onde diélectrique
JPWO2019156071A1 (ja) * 2018-02-07 2020-12-03 ダイキン工業株式会社 低分子量ポリテトラフルオロエチレンを含む組成物の製造方法
JP7324148B2 (ja) 2018-02-07 2023-08-09 ダイキン工業株式会社 低分子量ポリテトラフルオロエチレンを含む組成物の製造方法
US11739205B2 (en) 2018-02-07 2023-08-29 Daikin Industries, Ltd. Method for producing composition containing low molecular weight polytetrafluoroethylene
CN108481763A (zh) * 2018-03-27 2018-09-04 中国人民解放军国防科技大学 一种宽频透波低介电天线罩材料及其快速制备方法
CN112004610A (zh) * 2018-04-26 2020-11-27 Ａｇｃ株式会社 层叠体的制造方法及层叠体
JP2023501048A (ja) * 2019-09-17 2023-01-18 グジャラート フルオロケミカルズ リミテッド 低分子量ポリテトラフルオロエチレン微粉末及びその調製方法

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