KR940007139B1 - Electric wave absorbent - Google Patents
Electric wave absorbent Download PDFInfo
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- KR940007139B1 KR940007139B1 KR1019910014703A KR910014703A KR940007139B1 KR 940007139 B1 KR940007139 B1 KR 940007139B1 KR 1019910014703 A KR1019910014703 A KR 1019910014703A KR 910014703 A KR910014703 A KR 910014703A KR 940007139 B1 KR940007139 B1 KR 940007139B1
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- South Korea
- Prior art keywords
- wave absorber
- radio wave
- binder
- loss
- radio
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- 230000002745 absorbent Effects 0.000 title 1
- 239000002250 absorbent Substances 0.000 title 1
- 239000006096 absorbing agent Substances 0.000 claims description 23
- 239000000428 dust Substances 0.000 claims description 13
- 229910010272 inorganic material Inorganic materials 0.000 claims description 10
- 239000011147 inorganic material Substances 0.000 claims description 10
- 239000011230 binding agent Substances 0.000 claims description 9
- 238000009628 steelmaking Methods 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 claims description 2
- 238000010521 absorption reaction Methods 0.000 description 10
- 229910000859 α-Fe Inorganic materials 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 239000000203 mixture Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- -1 chamotte Chemical compound 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 229910052878 cordierite Inorganic materials 0.000 description 2
- JSKIRARMQDRGJZ-UHFFFAOYSA-N dimagnesium dioxido-bis[(1-oxido-3-oxo-2,4,6,8,9-pentaoxa-1,3-disila-5,7-dialuminabicyclo[3.3.1]nonan-7-yl)oxy]silane Chemical compound [Mg++].[Mg++].[O-][Si]([O-])(O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2)O[Al]1O[Al]2O[Si](=O)O[Si]([O-])(O1)O2 JSKIRARMQDRGJZ-UHFFFAOYSA-N 0.000 description 2
- 235000013980 iron oxide Nutrition 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000000696 magnetic material Substances 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 239000011701 zinc Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910018605 Ni—Zn Inorganic materials 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- JRPBQTZRNDNNOP-UHFFFAOYSA-N barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 description 1
- 229910002113 barium titanate Inorganic materials 0.000 description 1
- 239000000440 bentonite Substances 0.000 description 1
- 229910000278 bentonite Inorganic materials 0.000 description 1
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010433 feldspar Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000010450 olivine Substances 0.000 description 1
- 229910052609 olivine Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
- H01Q17/004—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems using non-directional dissipative particles, e.g. ferrite powders
Landscapes
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Aerials With Secondary Devices (AREA)
Abstract
내용 없음.No content.
Description
[발명의 명칭][Name of invention]
전파흡수재Radio wave absorber
[발명의 상세한 성명][Detailed Statement of Invention]
본 발명은 전파흡수재에 관한 것이며, 특히 전기로분진과 무기재료를 이용한 전파흡수재에 관한 것이다.The present invention relates to a radio wave absorber, and more particularly to a radio wave absorber using an electric dust and inorganic materials.
전파흡수재는 최근 급증하고 있는 전자기기에서 발생한 전파가 전자기기의 외부로 누출되어 다른 기기의 오동작을 일으키는 등의 전파장해를 일으키고, 인체 및 동식물에 악영향을 미치기 매문에 이 현상을 방지하거나 항공기, 선박, 대형구조물, 탱크, 대형차량, 건축물 둥으로 부터 전파가 반사되므로서 각종 전파의 혼선 또는 군용 목표물의 탐지가 용이하므로 이를 방지하기 위하여 사용되어 왔다.Radio wave absorbers cause radio interference such as radio waves from electronic devices, which recently increased rapidly, leak out of electronic devices, causing malfunctions of other devices, and adversely affect the human body and animals and plants. Since the radio waves are reflected from large structures, tanks, large vehicles, and buildings, it has been used to prevent crosstalk of various radio waves or military targets.
상기한 전파의 흡수를 위하여 도전손실을 이용한 카본 전파흡수재와 유전손실을 이용한 전파흡수재 및 자성손실을 이용한 페라이트 전파흡수재가 공지되었고, 또한 최근에는 상기한 도전손실과 자성손실을 결합한 카본 페라이트 전파흡수재가 개발되어 그 두께 및 전파흡수능에서 많은 진전이 있었다.In order to absorb the radio wave, a carbon wave absorber using a conductive loss, a wave absorber using a dielectric loss and a ferrite wave absorber using a magnetic loss have been known, and in recent years, a carbon ferrite wave absorber combining the above conductive loss and magnetic loss has been known. There has been much progress in its thickness and radio absorption capability.
그러나 상기한 페라이트 전파흡수재와 카본페라이트 전파흡수재에 사용되는 자성손실재인 페라이트는 일반식 MOㆍFe2O3(여기서 M은 망간, 니켈, 구리, 아연, 마그네슘, 코발트 등의 2가 금속임)로 표시되는바, 여기에 사용되는 금속산화물을 합성한 페라이트는 고가이고, 또한 제철소, 도금공장 등에서 발생하는 산제정 페수를 처리하여 얻어지는 산화철을 다른 금속산화물과 합성하여 사용하기도하나, 이 또한 산화철등이 포함된 산세정폐수를 분리하여 사용하기 때문에 가격면에서 만족하지 못하며, 전파흡수능에서도 개선의 여지가 많고 특히 대역폭이 좁은 결점이 있다.However, ferrite, which is a magnetic loss material used in the ferrite wave absorber and the carbon ferrite wave absorber, is a general formula MO · Fe 2 O 3 (where M is a divalent metal such as manganese, nickel, copper, zinc, magnesium, and cobalt). As can be seen, the ferrites synthesized with the metal oxides used here are expensive, and iron oxides obtained by treating acid-cleaned wastewater generated in steel mills, plating plants, etc. may be used in combination with other metal oxides. It is not satisfactory in terms of price because it separates and uses the included pickling wastewater, and there is a lot of room for improvement in the radio absorption ability, in particular, a narrow bandwidth.
본 발명자는 상기한 전파흡수재에 대하여 많은 시험과 연구를 한 결과 현재 전파흡수용으로 사용되고 있는 고주파 손실재인 자성재(페라이트), 유전재, 도전재 등에 문제점이 있는 것을 발견하였다.As a result of many tests and studies on the above-mentioned radio wave absorber, the present inventors found that there are problems such as magnetic materials (ferrite), dielectric materials, and conductive materials, which are currently used for radio wave absorption.
즉, 현재 사용되고 있는 고주파 손실재 예를들면 자성재는 이를 제조할 때 주성분화합물의 순도를 최대한 높은 것을 선택사용하여 초투자율을 높이고 자성손실을 최소화 한 것이기 때문에 자성손실이 적을수록 그 성능이 양호한 코어 등에 사용하기에는 적합하나, 전파흡수능의 향상과 주파수 대역폭의 확대를 목적으로 하는 전파흡수재는 그 고주파 손실이 크면 클수륵 양호한 성능을 발휘하는 것이므로 전파흡수재 용도로 사용하기에는 적합하지 않음을 알게 되었다.In other words, the high frequency loss materials currently used, for example, magnetic materials, are used to select the highest purity of the principal component compounds to increase the initial permeability and minimize the magnetic loss. Therefore, the lower the magnetic loss, the better the performance. Although it is suitable for use, it has been found that a radio wave absorber for the purpose of improving the radio wave absorbing capacity and the expansion of the frequency bandwidth exhibits a good performance when the high frequency loss is large, and thus is not suitable for use as a radio wave absorber.
그러나 현제까지 알려진 고주파 손실재는 코어 등에 사용하기 위하여 개발된 것이므로 이를 사용하여 전파흡수재를 만들면 당연히 바함직하지 않은 결과 즉, 전파흡수능, 두께, 주과수대역폭이 만족스럽지 못하게 되는 것이다.However, high frequency loss materials known to date have been developed for use in cores and the like, so making a radio wave absorber using them is indispensable, that is, the radio wave absorption capacity, thickness, and major fruit bandwidth are not satisfactory.
본 발명은 위와 같은 사실을 감안하여 제강용 전기로분진과 무기재료를 혼합하여 전파흡수능이 향상되고 주파수 대역폭이 넓으며, 경제적인 전파흡수재를 제공함을 목적으로 한다.SUMMARY OF THE INVENTION In view of the above facts, an object of the present invention is to provide a radio wave absorber having an improved radio wave absorption capability, a wider frequency bandwidth, and an economical radio wave absorber by mixing the steelmaking dust and steel materials for steelmaking.
본 발명은 위의 목적을 달성하기 위하여 제강용 전기로분진과 무기재료를 결합재에 분산시키거나 1종 이상의 2가 금속 및 도전손실재 또는 유전손실재를 부가한 것을 특징으로 한다.The present invention is characterized in that the steelmaking electric dust and inorganic materials for steelmaking are dispersed in a binder or at least one divalent metal and a conductive loss material or dielectric loss material are added.
본 발명은 전기로분진이 가지고 있는 전파흡수능 향상원리를 고려하고, 전파투과성인 무기재료에 의하여 다중 복사구조를 형성하여 전파의 손실을 크게 하므로서 전파흡수능이 향상되고, 주파수 대역 폭이 넓은 전파흡수재를 얻을 수 있다.The present invention considers the principle of improving the radio-absorption capacity of the electric dust, and by forming a multi-radiation structure by the radiopaque inorganic material to increase the loss of radio waves, the radio wave absorption capacity is improved, to obtain a radio wave absorber having a wide frequency band Can be.
본 발명에서 사용되는 제강용 전기로분진의 화학성분은 표 1과 같은 바, 스피낼 페라이트의 결정구조를가지고 있으며, 일반적으로 폐기물로서 그 처리가 곤란한 것으로서 집진기에서 회수된 상태의 것을 분진 이외의 이물질만을 분리하여 사용한다.The chemical composition of the electric furnace dust for steelmaking used in the present invention is as shown in Table 1, it has a crystal structure of spinal ferrite, it is generally difficult to treat it as a waste, only the foreign matter other than dust that is recovered from the dust collector Use separately.
[표 1]TABLE 1
또한 본 발명에서 사용되는 무기재료는 요업재료로서 사용되는 규사, 고령토, 장석, 점토, 벤토나이트, 샤모트, 지르콘모래, 유크립타이트, 코디에라이트, 올리빈, 스테아타이트, 뮤라이트, 페타라이트 등과 폐도기등의 산업폐기물 분쇄물 등을 1종 이상 사용하며, 도전손실재로서는 카본분말, 그라파이트, 카본블랙, 카본섬유 등 공지한 것이 사용되며, 티탄산 바륨과 같은 유전손실재도 사용될 수 있다.In addition, the inorganic material used in the present invention is used as a ceramic material, such as silica sand, kaolin, feldspar, clay, bentonite, chamotte, zircon sand, eu kryptite, cordierite, olivine, steatite, mulite, petarite and waste One or more kinds of industrial waste pulverized materials such as pottery are used, and as the conductive loss material, well-known ones such as carbon powder, graphite, carbon black, and carbon fiber are used, and dielectric loss materials such as barium titanate can also be used.
그리고 본 발명에서 부가되는 2가 금속도 공지한 상기한 것중에서 1종 이상이 사용되며, 또한 흡수하고저하는 전파의 주파수 특성에 따라 그 조성비, 무기재료의 입도 및 양등이 설계적으로 변경 실시되며, 결합재도 공지한 무기질 결합제, 유기질 결합재(도료용 비이클 포함)가 사용되며, 상기한 무기재료를 결합재로서 겸용할 수 있다.In addition, at least one of the above-mentioned divalent metals added in the present invention is also used, and the composition ratio, the particle size and quantity of the inorganic material, etc. are designed and changed according to the frequency characteristics of the radio waves absorbed and deteriorated. In addition, a known inorganic binder and an organic binder (including a vehicle for coating) are used as the binder, and the above-described inorganic materials can be used as the binder.
이하 실시예에 의하여 설명한다.It demonstrates by an Example below.
[실시예 1]Example 1
제강용 전기로분진(그 화학성분은 표 2와 같다) 70g과 시판되는 코디에라이트[유동기업(주)제품] 분말 30g을 폴리프로필렌수지 20g에 분산시켜 두께 2.4mm의 판상으로 만들어 네트워크 분석기로서 2.45GHz에서 전파흡수능을 측정한 결과 최대 -15dB의 감쇠특성을 얻었다.70g of electric furnace dust for steelmaking (chemical composition is shown in Table 2) and 30g of commercial Cordierite powder manufactured by Dairy Industries Co., Ltd. are dispersed in 20g of polypropylene resin to make 2.4mm thick plate. As a result of measuring the radio absorbance at GHz, the attenuation characteristic was obtained up to -15dB.
[표 2]TABLE 2
[실시예 2]Example 2
실시예 1과 같은 전기로분진 60g에 산화철 20g, 산화마그네슘 20g, 고령토 분말 20g 및 점토 10g을 균일하게 혼합하여 두께 6mm의 타일로 만들어 1350℃에서 소성한 후 네트워크 분석기로서 전파흡수능을 측정한 바, 중심주파수 S-밴드에서 -24dB의 반사 감쇠량을 얻었다.60 g of iron oxide, 20 g of magnesium oxide, 20 g of kaolin powder, and 10 g of clay were uniformly mixed with 60 g of the same electric furnace dust as in Example 1, and made into a 6 mm thick tile, fired at 1350 ° C., and then radio wave absorption capacity was measured using a network analyzer. The reflection attenuation of -24dB in the frequency S-band was obtained.
[실시예 3]Example 3
실시예 1과 같은 조성비에 그라파이트 분말 6g을 부가하여 2mm의 판상으로 만들어 네트워크 분석기로서 2.45GHz에서 전자흡수능을 측정한 바 최대 -20dB의 반사감쇠량을 얻었다.6 g of graphite powder was added to the same composition ratio as in Example 1 to form a 2 mm plate, and the electron absorption capability was measured at 2.45 GHz as a network analyzer, thereby obtaining a maximum amount of reflection attenuation of -20 dB.
[실시예 4]Example 4
실시예 2와 같은 조성비에 그라파이트 분말 9g을 부가하여 두께 5.6mm의 타일로 만들어 네트워크 분석기로서 반사감쇠량을 측정한 바, 주파수 2.5GHz∼5.5GHz의 범위에 걸쳐서 반사감쇠량이 얻어졌으며, 이때 최대감쇠량은 -18dB이었고, -18dB감쇠대역폭도 0.7GHz에 달하였다.9 g of graphite powder was added to the same composition ratio as in Example 2 to form a tile having a thickness of 5.6 mm, and the reflection attenuation was measured using a network analyzer. A reflection attenuation was obtained over a frequency range of 2.5 GHz to 5.5 GHz. It was -18dB and -18dB attenuation bandwidth reached 0.7GHz.
[실시예 5(비교예 1)]Example 5 (Comparative Example 1)
Mn-Zn 페라이트 분말 75g과 폴리에틸렌수지 25g을 균일하게 혼합하여 두께 2.4mm의 판상으로 만들어 네트워크 분석기로서 주파수 2.45GHz에서 전파흡수능을 측정한 바 최대 -20dB의 반사감쇠량을 얻었다.75 g of Mn-Zn ferrite powder and 25 g of polyethylene resin were uniformly mixed to form a plate with a thickness of 2.4 mm. As a network analyzer, radio wave absorbing capacity was measured at a frequency of 2.45 GHz.
[실시예 6(비교예 2)]Example 6 (Comparative Example 2)
Ni-Zn 페라이트분말 70g과 그라파이트 분말 9g을 폴리프로필렌 수지 25g에 균일하게 혼합한 후 두께 2mm의 판상으로 만든 것을 네트워크 분석기로서 주파수 2.45GHz에서 전파흡수능을 측청한 바, -20dB의 반사감쇠량을 얻었다.70 g of Ni-Zn ferrite powder and 9 g of graphite powder were uniformly mixed with 25 g of polypropylene resin, and then made into a plate having a thickness of 2 mm, and the radio wave absorption capacity was measured at a frequency of 2.45 GHz using a network analyzer.
이상의 실시예에서 알 수 있는 바와 같이 전기로분진과 무기재료를 결합재에 균일하게 혼합 분산시키므로서, 전기로분진이 가지고 있는 전파 흡수능에 다중복사 구조가 추가되어서 전파의 손실이 크게 되므로서, 전파 흡수능이 향상되고 대역폭이 넓은 전파흡수재를 얻을 수 있고, 또한 폐기물을 활용하므로서 경제적이며, 공해방지에도 기여할 뿐 아니라 생산공정도 간단한 효과 등이 있는 것이다.As can be seen in the above embodiment, by uniformly mixing and dispersing the electric dust and the inorganic material in the binder, the multi-radiation structure is added to the electric wave absorbing ability of the electric dust to increase the loss of electric wave, thereby improving the electric wave absorbing ability. It is possible to obtain a radio wave absorber with a wide bandwidth, and is economical by utilizing waste, and contributes to preventing pollution, and also has a simple effect on the production process.
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