KR100764659B1 - Glass Fiber Reinforced Nano Composites For Outdoor Antenna Having Microwave Shielding Property - Google Patents
Glass Fiber Reinforced Nano Composites For Outdoor Antenna Having Microwave Shielding Property Download PDFInfo
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Abstract
본 발명은 전자파 흡수 효율이 높은 나노입자(CB, 나노 페라이트)가 첨가된 에폭시 수지에 유리섬유를 함침시켜 나노입자를 균질하게 분산하여 섬유강화 복합재를 제작함으로써, 옥외용 안테나 배면층의 전자파간섭을 최소화할 수 있도록 마이크로파의 흡수성능을 향상시키는 전자파 차폐 섬유강화 나노 복합재료 및 그 제조방법에 관해 개시한다.The present invention by impregnating the glass fiber in the epoxy resin to which the nanoparticles (CB, nano ferrite) with high electromagnetic wave absorption efficiency is added to uniformly disperse the nanoparticles to produce a fiber-reinforced composite material, to minimize the electromagnetic interference of the antenna back layer for the outdoor An electromagnetic wave shielding fiber-reinforced nanocomposite material and a method for manufacturing the same, which improve the absorption performance of microwaves, are disclosed.
전자파 차폐, 흡수, 나노 입자, 유리섬유, 마이크로파, 옥외 안테나 Electromagnetic shielding, absorption, nanoparticles, fiberglass, microwave, outdoor antenna
Description
도1은 다층의 구조로 구성된 물질을 통과하는 전자기파의 반사, 투과 개념도,1 is a conceptual diagram of reflection and transmission of electromagnetic waves passing through a material composed of a multilayer structure;
도2는 본 발명에 실시예에 따른 전자파 차폐 섬유강화 나노 복합재료의 구조도,Figure 2 is a structural diagram of the electromagnetic wave shielding fiber reinforced nano composite material according to an embodiment of the present invention,
도3a는 본 발명의 실시예에 따른 전자파 차폐 섬유강화 나노 복합재료의 유전적 특성에 의한 전자기파 차폐 원리 개념도,Figure 3a is a conceptual diagram of electromagnetic shielding due to the dielectric properties of the electromagnetic wave shielding fiber reinforced nano composite material according to an embodiment of the present invention,
도3b는 본 발명의 실시예에 따른 전자파 차폐 섬유강화 나노 복합재료의 자기적 특성에 의한 전자기파 차폐 원리 개념도,Figure 3b is a schematic diagram of the electromagnetic shielding principle by the magnetic properties of the electromagnetic wave shielding fiber reinforced nano composite material according to an embodiment of the present invention,
도4는 프리프레그 성형 과정을 나타내는 싸이클,4 is a cycle showing a prepreg forming process,
도5는 본 발명에 따른 실시예의 전자기파 차폐효율의 분포.5 is a distribution of electromagnetic shielding efficiency of the embodiment according to the present invention.
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본 발명은 옥외 송수신 안테나에 적용가능한 마이크로파(Microwave) 대역의 전자기파 차폐용 섬유강화 나노 복합재료에 관한 것으로서, 보다 상세하게는 에폭시 등의 열경화성수지에 분말형태의 나노 입자들(Carbon Black(CB), Nano-Ferrite)을 균질하게 분산시킨 섬유강화 나노 복합재료로 제작된 전자파 차폐용 옥외용 안테나 배면층에 관한 것이다.The present invention relates to a fiber-reinforced nanocomposite material for electromagnetic wave shielding of the microwave band applicable to an outdoor transmitting / receiving antenna, and more specifically, to the thermosetting resin such as epoxy, nanoparticles in powder form (Carbon Black (CB), The present invention relates to an outdoor antenna backing layer for electromagnetic shielding made of a fiber-reinforced nanocomposite material in which nano-ferrite is homogeneously dispersed.
전자기파 차폐는 재료의 반사특성과 흡수특성을 이용하여 차폐층의 배면 또는 신호발생지로의 수신신호를 최소화하는 것으로, 전자기파의 유용한 사용과 더불어 인체에 위해한 전자파로부터의 차단이라는 목적뿐만 아니라 전자파 간섭에 의한 통신전자기기의 오작동 방지 등의 이유로도 중요한 의미를 가진다.Electromagnetic shielding minimizes the received signal to the back of the shielding layer or signal source by using the reflective and absorbing properties of the material.It is useful for the use of electromagnetic waves as well as the purpose of blocking electromagnetic waves from harm to humans. It is also important for reasons such as preventing malfunction of communication electronic devices.
전자기파는 파장의 길이에 따라 각기 다른 특성을 가지며 이에 따라 각기 다른 이름으로 불리는데, 이중에서 마이크로파는 일반적으로 300～3,000MHz(UHF, Ultrahigh frequency, 극초단파)와 3～300GHz(SHF, Superhigh frequency, 센티미터파)를 통칭하는데, 특히 UHF 범위의 전자파는 파장이 짧아 직진성과 반사, 굴절 등 빛과 거의 같은 특성을 보임과 동시에 많은 양의 정보를 보낼 수 있어 무선통신이나 텔레비전중계 등 상용 전자통신장비에 주로 사용되고 있다.Electromagnetic waves have different characteristics depending on the length of the wavelength and are therefore called different names, of which microwaves are generally 300-3,000 MHz (UHF, Ultrahigh frequency) and 3-300 GHz (SHF, Superhigh frequency, centimeter) In general, the electromagnetic wave in the UHF range has a short wavelength and shows almost the same characteristics as light, such as straightness, reflection, and refraction, and can transmit a large amount of information.It is mainly used for commercial electronic communication equipment such as wireless communication or television broadcasting. have.
다층의 구조로 구성된 물질을 통과하는 전자기파는 도1과 같이 물질의 표면 에서 반사와 투과가 발생하며 다시 내부에서 반사와 소멸간섭, 투과를 반복하여 최종적으로 입사방향으로 반사신호를, 배면층으로 투과신호를 방출하게 된다. Electromagnetic waves passing through a material composed of a multi-layered structure generate reflection and transmission at the surface of the material as shown in FIG. 1, and then repeatedly reflect, disappear, and transmit the reflection signal in the direction of incidence. Will emit a signal.
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전자파를 차폐하고자 하는 노력으로, 전자파 차폐용 도전성 블랙착색 코팅필름에 대한 발명(10-2002-0023621)이나 유전체 세라믹 분으로부터 생성된 수지를 함유한 도포물에 대한 발명(10-2003-0033706)등이 제기 되었으나, 이러한 방법은 대용량의 정보를 송수신 하는 옥외용 대형안테나에 적용하기가 쉽지 않아 통상적으로 금속류의 배면층을 이용하여 대형 안테나 송수신기를 구성하여 사용하고 있다. 그러나 이러한 방법은 무게가 무겁고 전자파에 대한 높은 반사특성 등으로 인하여 전자파의 산란이나 간섭 등이 발생하여 질 높은 전자파 송수신을 저해하는 문제점이 발생하게 된다.In an effort to shield electromagnetic waves, an invention on conductive black-colored coating film for electromagnetic shielding (10-2002-0023621) or an invention on a coating containing resin produced from dielectric ceramic powder (10-2003-0033706), etc. Although this method has been proposed, such a method is not easy to be applied to an outdoor large antenna for transmitting and receiving a large amount of information, and thus, a large antenna transceiver is generally used by using a metal back layer. However, this method is a heavy weight and due to the high reflection characteristics of the electromagnetic waves, such as scattering or interference of the electromagnetic wave is generated a problem that inhibits high-quality electromagnetic wave transmission and reception.
따라서, 본 발명은 이와 같은 문제점을 감안한 것으로써, 본 발명의 목적은 유리섬유와 에폭시 수지 또는 이와 같은 열경화성 수지에 전자기파 차폐효율이 높은 나노 입자들(Carbon Black(CB), Nano Ferrite)을 균질하게 분산시켜 경량이면서도 내구성과 기계적 물성이 좋으며 전자파 흡수성능이 향상된 옥외 안테나용 전자파 차폐 섬유강화 나노 복합재료를 제공함에 있다. Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to homogeneize nano particles (Carbon Black (CB), Nano Ferrite) having high electromagnetic shielding efficiency in glass fiber and epoxy resin or thermosetting resin. The present invention provides an electromagnetic shielding fiber-reinforced nanocomposite material for outdoor antennas, which is light in weight, has good durability and mechanical properties, and has improved electromagnetic wave absorption performance.
상기 목적을 달성하기 위한 본 발명에 따른 전자파 차폐 섬유강화 나노 복 합재료는 유리섬유와 에폭시 수지 또는 이와 같은 열경화성 수지에 카본블랙(Carbon Black, CB), 나노 페라이트(Nano Ferrite) 등의 나노 입자가 첨가된 것을 특징으로 한다.Electromagnetic shielding fiber-reinforced nanocomposite material according to the present invention for achieving the above object is a glass fiber and epoxy resin or a thermosetting resin such as carbon black (Carbon Black, CB), nano ferrite (Nano Ferrite) It is characterized by the addition.
이하, 본 발명에 따른 옥외 안테나용 전자파 차폐 섬유강화 나노 복합재료 및 그 제조 방법에 대해 상세하게 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, the electromagnetic wave shielding fiber reinforced nanocomposite material for outdoor antennas and its manufacturing method which concern on this invention are demonstrated in detail.
본 발명은 전자파 투과성이 좋은 유리강화 복합재료에 나노 입자가 혼합된 전자파 차폐 섬유강화 나노복합재료에 관한 것이다. 이는 유리 섬유로만 이루어진 복합재료의 경우에는 전자파의 흡수가 일어나지 않으므로, 전자기파 차폐효율이 높은 나노 입자를 첨가하여 전자파의 차폐성능을 향상시키고자 한 것으로서, 도2의 본 발명에 따른 전자파 차폐 섬유강화 나노 복합재료의 구조도를 참조하면, 에폭시 수지에 분말형태의 나노 입자들(CB, Nano Ferrite)을 균질하게 분산시켜, 입사되는 전자파 에너지를 다층의 적층구조로 간섭소멸 시키거나, 또는 나노 입자의 재배열(도3a)이나 회전운동에 따른 분자운동을 통하여 열에너지로 전환(도3b)시켜 전자파의 흡수성능을 향상시킨 것이다.The present invention relates to an electromagnetic wave shielding fiber-reinforced nanocomposite material in which nanoparticles are mixed with a glass-reinforced composite material having good electromagnetic wave permeability. This is because the absorption of electromagnetic waves does not occur in the case of a composite material made of glass fiber only, and to improve the shielding performance of electromagnetic waves by adding nanoparticles having high electromagnetic shielding efficiency, the electromagnetic shielding fiber reinforced nano according to the present invention of FIG. Referring to the structural diagram of the composite material, the nanoparticles (CB, Nano Ferrite) in the form of powder is uniformly dispersed in the epoxy resin to interfere with the incident electromagnetic energy in a multilayered structure, or rearrange the nanoparticles. It is converted to thermal energy (Fig. 3b) through the molecular motion (Fig. 3a) or rotational motion to improve the absorption performance of electromagnetic waves.
상기 전자파 차폐 섬유강화 나노 복합재료에 있어서 나노 입자의 첨가비율은 전체 무게에 대하여 3 내지 10wt% 정도로 혼합해야 하는데, 이는 나노 입자가 3wt% 미만으로 첨가되면 차폐특성을 지니는 나노 입자수가 너무 작아서 입사되는 전자파를 대부분 투과시켜 효과적인 흡수특성을 기대할 수 없으며, 10wt%를 초과하 여 첨가되는 경우에는 점도가 높아져서 균질하게 분산할 수 없을 뿐만 아니라 섬유강화 나노 복합재의 무게가 무거워지는 문제점이 발생하기 때문이다.In the electromagnetic shielding fiber-reinforced nanocomposite, the addition ratio of the nanoparticles should be mixed in an amount of about 3 to 10 wt% based on the total weight. When the nano particles are added in an amount less than 3 wt%, the number of nano particles having shielding properties is too small to be incident. This is because most of the electromagnetic waves cannot be effectively absorbed, and when added in excess of 10wt%, the viscosity increases, so that it cannot be dispersed homogeneously, and the weight of the fiber-reinforced nanocomposite becomes heavy.
본 발명을 위한 구체적인 제조방법은, 먼저 에폭시 수지에 분말형태의 나노 입자들(CB, Nano Ferrite)을 전체 무게 대비 3 내지 10wt% 정도 첨가하여 초음파분산기(Sonicator)로 1 내지 3시간 동안 분산시켜 균질하게 분산한 후에, 평직유리섬유에 균질하게 도포시켜 프리프레그를 제작한다. 그리고 이를 적층하여 요구되는 형상의 구조체를 제작한다. In a specific manufacturing method for the present invention, first, by adding about 3 to 10wt% of the nanoparticles (CB, Nano Ferrite) in the form of powder to the epoxy resin by dispersing for 1 to 3 hours with a sonicator homogeneous After the dispersion, the prepreg is prepared by homogeneously applying to the plain weave glass fiber. And it laminated | stacked and manufactured the structure of the required shape.
본 발명에서 사용되는 매트릭스(matrix)는 에폭시수지와 같은 열경화성 수지 조성물이 사용될 수 있으며, 절연효과와 각각의 섬유들을 결합하는 역할을 수행하게 된다.As the matrix used in the present invention, a thermosetting resin composition such as an epoxy resin may be used, and serves to bond the fibers with the insulating effect.
상기의 발명 내용에 의거 제작된 프리프레그는 적층방법과 적층두께 등에 따라 다소 상이한 특성을 보이는데, 본 발명에 대하여 아래에 실시예로 상세히 설명하고자 하나 본 발명은 하기의 실시예에 국한되는 것은 아니다.The prepreg produced according to the above-described invention shows somewhat different characteristics according to the lamination method and the lamination thickness, but the present invention will be described in detail with reference to the following Examples, but the present invention is not limited to the following Examples.
Br계 에폭시 수지에 카본블랙(CB)을 5wt%로 첨가하여 초음파분산기(Sonicator)를 이용하여, 2시간 동안 분산 한 후에, KPI의 KN1800 평직유리섬유에 균질하게 도포시켜 프리프레그를 제작하고, 이를 적층하여 도4의 성형사이클로 경화시켜 시편을 제작하였다.
이때, 섬유강화 복합재료의 전자기파 차폐특성은 적층된 매질의 두께와 섬유의 방향성에 영향을 받으므로, 대칭구조를 유지하며 Cross-ply의 적층각도로 16장의 프리프레그를 적층하여 시편을 제작하였다.Carbon black (CB) was added to Br-based epoxy resin at 5wt%, dispersed for 2 hours using an ultrasonic disperser, and then uniformly applied to KPI KN1800 plain weave glass fiber to prepare a prepreg. Laminated and cured in the molding cycle of Figure 4 to prepare a specimen.
At this time, the electromagnetic shielding properties of the fiber-reinforced composite material is affected by the thickness of the laminated medium and the orientation of the fiber, so that the specimens were prepared by laminating 16 prepregs with a cross-ply lamination angle while maintaining a symmetrical structure.
도5는 상기 방법으로 제작된 시편을 50MHz에서 1.5GHz까지의 UHF Microwave 주파수 범위에서의 전자파 차폐특성을 S-parameter 분석법을 이용하여 측정한 결과로서, 16장의 프리프레그 적층만으로도 양호한 전자파 차폐특성을 보임을 확인할 수 있다.5 is a result of measuring the electromagnetic shielding characteristics in the UHF microwave frequency range of 50 MHz to 1.5 GHz using the S-parameter analysis method, showing good electromagnetic shielding characteristics with only 16 prepreg laminates. can confirm.
삭제delete
본 발명은 상기 실시 예에 한정되지 않으며 당해 기술이 속한 분야에서의 통상의 지식을 가진 자에 의하여 본 발명의 기술적 사상 내에서 많은 변형에 의한 실시 가능함은 명백하다.It is apparent that the present invention is not limited to the above embodiments and can be implemented by many variations within the technical idea of the present invention by those skilled in the art.
이와 같이 본 발명에 의한 전자파 차폐 섬유강화 나노 복합재료는 유리섬유와 에폭시 수지 또는 이와 같은 열경화성 수지에 전자기파 차폐효율이 높은 나노 입자들(CB, Nano Ferrite)을 균질하게 분산시킴으로써 전자파의 흡수성능을 향상시킴과 동시에 양호한 기계적 강도를 보여 마이크로파의 산란이나 간섭을 효과적으로 감쇄시킬 수 있어 옥외 안테나 배면층에 적용 가능할 것이다.As described above, the electromagnetic wave shielding fiber-reinforced nanocomposite material according to the present invention improves the absorption performance of electromagnetic waves by homogeneously dispersing nanoparticles (CB, Nano Ferrite) having high electromagnetic wave shielding efficiency in glass fiber and epoxy resin or thermosetting resin. At the same time, it exhibits good mechanical strength and can effectively attenuate microwave scattering or interference, and thus can be applied to an outdoor antenna back layer.
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| KR20020007234A (en) * | 2001-09-18 | 2002-01-26 | 이택수 | Manufacture for anti-static and high temperature composite panel to include nano particle |
| US6689835B2 (en) | 2001-04-27 | 2004-02-10 | General Electric Company | Conductive plastic compositions and method of manufacture thereof |
| KR20040078002A (en) * | 2003-03-03 | 2004-09-08 | (주) 나노텍 | Carbon Nano-Composite Materials for Shielding of Electromagnetic Wave and Preparation Method Thereof |
| KR20050092714A (en) * | 2002-12-20 | 2005-09-22 | 다우 글로벌 테크놀로지스 인크. | Near net shape prepreg |
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| US6689835B2 (en) | 2001-04-27 | 2004-02-10 | General Electric Company | Conductive plastic compositions and method of manufacture thereof |
| KR20020007234A (en) * | 2001-09-18 | 2002-01-26 | 이택수 | Manufacture for anti-static and high temperature composite panel to include nano particle |
| KR20050092714A (en) * | 2002-12-20 | 2005-09-22 | 다우 글로벌 테크놀로지스 인크. | Near net shape prepreg |
| KR20040078002A (en) * | 2003-03-03 | 2004-09-08 | (주) 나노텍 | Carbon Nano-Composite Materials for Shielding of Electromagnetic Wave and Preparation Method Thereof |
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| WO2012064125A1 (en) * | 2010-11-10 | 2012-05-18 | 한국기계연구원 | Electromagnetic wave absorber using a dielectric loss sheet, method for forming the electromagnetic wave absorber, and rotary blade for a wind turbine having an electromagnetic wave function using same |
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