WO2013121682A1 - Matériau diélectrique composite et antenne diélectrique l'utilisant - Google Patents

Matériau diélectrique composite et antenne diélectrique l'utilisant Download PDF

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Publication number
WO2013121682A1
WO2013121682A1 PCT/JP2012/083467 JP2012083467W WO2013121682A1 WO 2013121682 A1 WO2013121682 A1 WO 2013121682A1 JP 2012083467 W JP2012083467 W JP 2012083467W WO 2013121682 A1 WO2013121682 A1 WO 2013121682A1
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WO
WIPO (PCT)
Prior art keywords
antenna
dielectric material
dielectric
composite dielectric
composite
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Application number
PCT/JP2012/083467
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English (en)
Japanese (ja)
Inventor
淳一 吉野
尾上　智章
勇二 岸田
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株式会社村田製作所
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Publication of WO2013121682A1 publication Critical patent/WO2013121682A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L19/00—Compositions of rubbers not provided for in groups C08L7/00 - C08L17/00
    • C08L19/003—Precrosslinked rubber; Scrap rubber; Used vulcanised rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C08L25/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
    • C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
    • C08L53/025—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes modified
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/002—Inhomogeneous material in general
    • H01B3/004—Inhomogeneous material in general with conductive additives or conductive layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/442—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from aromatic vinyl compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0421—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with a shorting wall or a shorting pin at one end of the element
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon

Definitions

  • the present invention relates to a composite dielectric material and a dielectric antenna using the same.
  • the reduction in size and weight of a dielectric antenna is largely related to the characteristics of the dielectric material used for the dielectric antenna.
  • the resonant wavelength of the antenna is inversely proportional to the square root of the dielectric constant of the dielectric material used for the antenna. Therefore, by using a high dielectric constant material, the resonance wavelength can be shortened and the antenna can be downsized.
  • the weight of the antenna is proportional to the specific gravity of the dielectric material of the antenna. Therefore, it is necessary to reduce the specific gravity of the dielectric material in order to reduce the weight of the antenna.
  • the dielectric material used for the dielectric antenna is required to have a high dielectric constant and a low specific gravity.
  • the dielectric material used for the dielectric antenna is required to have a low dielectric loss tangent.
  • dielectric ceramics alone as a dielectric material.
  • dielectric ceramics have a large specific gravity, they cannot cope with weight reduction and have problems such as poor workability and formability.
  • a composite dielectric material including a syndiotactic polystyrene resin (hereinafter referred to as SPS), which is an organic material having a small specific gravity and excellent heat resistance and high-frequency characteristics, is suitable as a dielectric material that solves the above problems.
  • SPS syndiotactic polystyrene resin
  • Patent Document 1 discloses a matrix resin, an inorganic filler made of SPS as a method for manufacturing a dielectric antenna that satisfies the requirements for miniaturization and weight reduction of an antenna and can be plated without harmful chromic acid etching. And a method of manufacturing a dielectric antenna using a composite dielectric material obtained by mixing an elastomer.
  • the plating film peel strength is improved by containing an elastomer.
  • the dielectric antenna can be reduced in size and weight, and there are advantages from the viewpoint of workability and the like. is there.
  • the antenna may be used in a place where the user touches the eyes.
  • the housing is black
  • the antenna is also required to be black.
  • a blackening material it is conceivable to add a blackening material to the composite dielectric material in order to blacken the material itself.
  • some blackening materials have electrical conductivity, and when a material having electrical conductivity is used, the amount of polarization under an alternating electric field in the composite dielectric material increases. There is a possibility that the dielectric loss tangent rises outside the allowable range, and desired characteristics as an antenna cannot be obtained. Therefore, a composite dielectric material that is black and has desired characteristics to be provided as an antenna is desired.
  • a main object of the present invention is to provide a composite dielectric material which is black and has desired characteristics as an antenna, and a dielectric antenna using the composite dielectric material.
  • the present invention includes a syndiotactic polystyrene resin, an inorganic filler, an elastomer, and carbon black having an average primary particle size of 36 to 122 nm, and the carbon black content is 2 to 4% by volume. It is characterized by being.
  • the components other than carbon black in the composite dielectric material have a content of the SPS of 30 to 60% by volume and a content of the inorganic filler of 15 to 20% by volume. It is preferable that the content of the elastomer is 20 to 50% by volume.
  • the content of the elastomer is 28 to 50% by volume.
  • the present invention is a dielectric antenna including an antenna substrate made of the composite dielectric material according to the present invention, a radiation electrode, a feeding electrode, and a ground electrode.
  • a black dielectric antenna can be provided.
  • the composite dielectric material according to the present invention includes an inorganic filler, it has a dielectric constant that can cope with the miniaturization of the antenna, and the dielectric antenna using the composite dielectric material can be miniaturized. It is.
  • the composite dielectric material includes SPS having a low dielectric loss tangent and a low specific gravity, the composite dielectric material can provide a dielectric antenna that has good antenna efficiency and can be reduced in weight.
  • the composite dielectric material can be made black while maintaining a dielectric loss tangent sufficient for antenna efficiency. Thereby, a black dielectric antenna can be obtained and it can respond to the case where a black dielectric antenna is required.
  • the composite dielectric material according to the present invention has an SPS content of 30 to 60% by volume, an inorganic filler content of 15 to 20% by volume, and an elastomer content of 20 to 50% by volume.
  • the composite dielectric material having more preferable impact strength can be obtained by setting the elastomer content to 28 to 50% by volume.
  • the characteristics of the composite dielectric material obtained vary depending on the primary particle diameter of the carbon black to be blended and the blending amount thereof.
  • the primary particle diameter of the carbon black to be blended is reduced, the amount of polarization of the composite dielectric material under an alternating electric field increases, and the dielectric loss tangent tends to increase.
  • the content of carbon black is too small, the degree of black coloration is not sufficient, and when the content is too large, the dielectric loss tangent increases due to an increase in the polarization amount under an alternating electric field.
  • the dielectric antenna 1 configured as described above, high-frequency power is supplied from the feed electrode 4 to the radiation electrode 3. As a result, the dielectric antenna 1 generates a high-frequency electromagnetic field and transmits radio waves. Moreover, the radiation electrode 3 induces a high-frequency current and transmits it to the RF circuit when receiving radio waves.
  • the radiation electrode 3, the feeding electrode 4 and the ground electrode 5 are formed by punching a predetermined shape from a metal foil prepared in advance.
  • a metal member composed of the radiation electrode 3, the feeding electrode 4, and the ground electrode 5 is disposed in a predetermined mold, the composite material used for the dielectric antenna 1 according to the present embodiment is heated and melted.
  • the antenna base 2, the radiation electrode 3, the feeding electrode 4, and the ground electrode 5 are integrally formed by injection molding in a mold, and the target dielectric antenna 1 can be obtained.
  • the radiation electrode 3, the feed electrode 4 and the ground electrode 5 after the antenna base 2 is formed, the radiation electrode 3, the feed electrode 4 and the ground electrode are matched to the shape of the antenna base 2.
  • a method of forming and integrating 5 can also be used.
  • the radiation electrode 3, the feeding electrode 4, and the ground electrode 5 may be formed by using a method such as plating, sputtering, or vapor deposition.
  • the composite dielectric material according to the present invention is obtained by mixing SPS, an inorganic filler, an elastomer, and carbon black.
  • Composition ratio of the composite dielectric material according to the present example and the comparative example differ from each other particularly in terms of the average primary particle diameter and content of carbon black. That is, in Examples 1 to 7, the content of carbon black having an average primary particle size of 36 to 122 nm is in the range of 2 to 4% by volume, but in Comparative Examples 1 to 3, the content is outside that range. is there. In Comparative Example 1, the carbon black contained has an average primary particle diameter of 28 nm, that is, outside the range of 36 to 122 nm. In Comparative Examples 2 and 3, 66 nm carbon black having an average primary particle size in the range of 36 to 122 nm is contained in 5% by volume and 1% by volume, respectively. The amount is outside the range of 2-4% by volume.
  • the elastomer content is in the range of 28 to 50% by volume.
  • the contents of the elastomers of Example 6 and Example 7 are 25% by volume and 20% by volume, which are outside the range of 28-50% by volume, respectively.
  • the dielectric loss tangent did not satisfy the target value when 5% by volume of carbon black having an average primary particle size of 66 nm was contained. This is because carbon black has electrical conductivity, so that the amount of carbon black compounded increases and the amount of polarization of the entire composite dielectric material under an alternating electric field increases.
  • Comparative Example 3 when the primary particle average particle size is the same as Comparative Example 2, that is, when only 1% by volume of carbon black having a primary particle average particle size of 66 nm is blended, The carbon black content was not sufficient for blackening, and the L value indicating blackness did not satisfy the target value.
  • Example 1 to 5 in which the elastomer content was in the range of 28 to 50% by volume, the Charpy impact strength satisfied the target value.
  • Example 6 and Example 7 since the elastomer content was low, the Charpy impact strength did not satisfy the target value. Although the impact strengths of Examples 6 and 7 have not reached the target value of Charpy impact strength, there is no practical problem in use as a dielectric antenna.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Inorganic Insulating Materials (AREA)
  • Organic Insulating Materials (AREA)
  • Details Of Aerials (AREA)

Abstract

L'invention porte sur un matériau diélectrique composite qui est de couleur noire et est prévu avec des caractéristiques souhaitables en tant qu'antenne ; et une antenne diélectrique qui utilise ledit matériau diélectrique composite. Le matériau diélectrique composite est caractérisé par le fait qu'il contient une résine de polystyrène syndiotactique, une charge inorganique, un élastomère et noir de carbone ayant une taille moyenne de particule primaire de 36 à 122 nm. Le matériau diélectrique composite est caractérisé en outre en ce que le contenu du noir de carbone est de 2 à 4 % en volume.
PCT/JP2012/083467 2012-02-15 2012-12-25 Matériau diélectrique composite et antenne diélectrique l'utilisant WO2013121682A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012030151 2012-02-15
JP2012-030151 2012-02-15

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WO2013121682A1 true WO2013121682A1 (fr) 2013-08-22

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