• Title, Summary, Keyword: 복합재료 안테나

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Design and Impact Testing of Cylindrical Composite Antenna Structures (원통형 복합재료 안테나의 설계 및 충격 실험에 관한 연구)

  • Lee, Sang-Min;Cho, Sang-Hyun;Lee, Chang-Woo;Hwang, Woon-Bong
    • Composites Research
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    • v.22 no.3
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    • pp.55-59
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    • 2009
  • Microstrip antennas are low profile, are conformable to planar and nonplanar surfaces, are simple and inexpensive to manufacture, mechanically robust when mounted on rigid surfaces and are compatible with MMIC(Monolithic microwave integrated circuit) designs; they have been used in diverse communication systems. The rectangular microstrip patch antenna is designed for a central frequency of 12.5 GHz, and the final product is a $4{\times}1$ array antenna with curvature radius of 200 mm. The microstrip antenna is embedded in a sandwich structure which consists of skin and core material. After impact, the performance of damaged antenna is estimated by measuring the return loss and radiation pattern. The antenna performance was not affected by this impact damage.

Development of a Thermoplastic Composite Parabolic Antenna Reflector using Automated Fiber Placement Method (자동섬유적층법을 이용한 열가소성 복합재료 접시형 안테나 반사판 개발)

  • Kim, Jin-Bong;Kim, Tae-Wook
    • Composites Research
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    • v.19 no.1
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    • pp.15-21
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    • 2006
  • It is very difficult to make complex 3 dimensional curved-shape composite laminates using the advanced unidirectional composite prepregs. This study shows development process of subscale composite parabolic antenna reflector using unidirectional AS4/PEEK prepreg tapes. The AS4/PEEK thermoplastic composite materials are known to have good thermal and chemical stabilities in addition to their high specific strength and modulus. Various lamination methods were investigated through finite element analyses to make up the laminate design of the reflector. The automated fiber placement method was used to fabricate the reflector. The thermal expansion test using full-bridge strain gage circuits was done to verity the performance of the composite product.

Preparation and Analysis of the Deployment Behavior of Shape Memory Polymer Composite Antennas (형상기억고분자 복합재료 안테나의 제조 및 전개 거동 분석)

  • An, Yongsan;Kim, Jinsu;Goo, Nam Seo;Park, Miseon;Kim, Yeontae;Park, Jong Kyoo;Yu, Woong-Ryeol
    • Composites Research
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    • v.31 no.6
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    • pp.347-354
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    • 2018
  • Shape memory polymer composites have been studied for deployable antennas in space because they have advantages of lightweight, large deformability, good processability, and low cost. In this research, shape memory polymer composites (SMPCs) were manufactured using carbon nanotubes (CNTs) as reinforcements and were used to fabricate SMPC antenna. The SMPCs were prepared by dispersing CNTs in the polymer matrix. Various dispersion methods were investigated to determine the most suitable one, focusing on the mechanical properties of SMPCs including their fracture behavior. The shape memory properties of SMPCs were measured and finally, the deployment behavior of the SMPC antenna was analyzed.

Microstrip Antenna for SAR Applications with Microwave Composite Laminates and Honeycomb Cores (복합재료 하니콤 샌드위치 판넬을 이용한 SAR 시스템용 마이크로스트립 안테나 개발)

  • 유치상;이라미;황운봉;박현철;박위상
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.195-198
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    • 2000
  • Microstrip antenna for SAR applications is designed with microwave composite laminates and Nomex honeycomb cores, which becomes an aircraft's structural panel. This study demonstrated fabrication, design procedures and structural and electrical performances of complex antenna system presented. For validating structural rigidity, 3-point bending test is performed, and simulation results for the complex antenna array are compared with measurements for its electrical performance. The results show that this antenna system can be applied in dual polarized synthetic aperture radar and has a good flexural stiffness with comparison of previous sandwich constructions.

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Impact and Bending Characteristics of Dual Band Composite Antennas (복합 구조 이중대역 안테나의 충격 및 굽힘 특성)

  • Shin, Dong-Sik;Kim, Jin-Yul;Park, Wee-Sang;Hwang, Woon-Bong
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.11 no.2
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    • pp.35-40
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    • 2011
  • We have studied the impact and bending characteristics of a dual band antenna (1.575, 2.645 GHz) with composite sandwich construction. Mechanical performance of the antenna can be improved by reinforcing the antenna by sandwiching the planar antenna with layers of carbon fiber-reinforced plastic(CFRP) and glass fiber-reinforced plastic(GFRP) using an adhesive film. According to the ASTM D7137, ASTM C393 and MIL-STD401B, impact and bending test were performed and the S-parameters and gains of the antenna were measured in order to verify electrical and mechanical performance. The maximum contact load and the bending load of the antenna are 4 kN and 400 N and gains of the antenna are 6 dBi and 4.6 dBi in the GPS and DMB bands, respectively. The proposed antenna structure can be applied to surfaces of vehicles.

Bending Fatigue Characteristics of Surface-Antenna-Structure (복합재료 표면안테나 구조의 굽힘 피로특성 연구)

  • Kim D. H;Hwang W;Park H. C;Park W. S
    • Composites Research
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    • v.17 no.6
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    • pp.22-27
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    • 2004
  • The objective of this work is to design Surface Antenna Structure (SAS) and investigate fatigue behavior of SAS that is asymmetric sandwich structure. This term, SAS, indicates that structural surface becomes antenna. Constituent materials are selected considering electrical properties, dielectric constant and tangent loss as well as mechanical properties. For the antenna performance, SSSFIP elements inserted into structural layers were designed fur satellite communication at a resonant frequency of 12.5 GHz and final demonstration article was $16{\;}{\tiems}{\;}8$ array antenna. From electrical measurements, it was shown that antenna performances were in good agreement with design requirements. In cyclic 4-point bending, flexure behavior was investigated by static and fatigue test. Fatigue life curve of SAS was obtained. The fatigue load was determined experimentally at a 0.75 (1.875kN) load level, Experimental results were compared with single load level fatigue life prediction equations (SFLPE) and in good agreement with SFLPE. SAS concept is the first serious attempt at integration fur both antenna and composite engineers and promises innovative future communication technology.

Design of Multilayer Composite-Antenna-Structures Considering Adhesive (접착필름의 영향을 고려한 다층 복합재료 안테나 구조 설계)

  • Kim, D.S.;Park, H.C.;Park, W.S.;Hwang, W.
    • Composites Research
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    • v.20 no.2
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    • pp.27-31
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    • 2007
  • "Structural surface becomes an antenna." This term, CAS, indicates antenna embedding in structural surfaces. The CAS is composed of several composite laminates and Nomex honeycombs, and microstrip antenna elements are inserted between layers with designed configurations. Constituent materials are selected considering electrical contributions as well as mechanical performances. Antenna design with adhesive films are impossible because of their thin and rough distributions between honeycomb and substrate. Therefore, adhesive effects on antenna performances in CAS are experimentally investigated, CAS with targeted impedance and radiation characteristics are designed considering adhesive effects. multilayer

Dynamic Analysis of Composite Satellite Antenna Structure for Sine Vibration Test (복합재료 위성안테나의 진동시험을 위한 구조 동해석)

  • ;;;;;Horst Stockburger
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.119-122
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    • 2002
  • The vibration qualification test of satellite antenna is required to verify that there will be no structural damage due to the severe vibration caused by the launch of satellite. For the qualification test, reasonable test load condition needs to be introduced by dynamic analysis. The present work has been performed to provide an understanding how the qualification test load can be evaluated by the results of both normal mode and sine vibration analyses with notching technique for a composite Ka-band antenna structure.

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Design and Test of a Deployment Mechanism for the Composite Reflector Antenna (복합재료 반사판 안테나의 전개 메커니즘 설계 및 시험)

  • Chae, Seungho;Oh, Young-Eun;Lee, Soo-Yong;Roh, Jin-Ho
    • Journal of Aerospace System Engineering
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    • v.12 no.6
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    • pp.58-65
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    • 2018
  • The dynamic characteristics of the deployable composite parabolic reflector with several panels were numerically and experimentally investigated. The deployment mechanism is designed to efficiently fit in a small volume. The parameters guiding the deployment are determined by considering; the number of panels, folding/twisting angles, and the driving forces of actuating devices. The panels are fabricated using carbon fiber reinforced plastics (CFRPs). The zero-gravity simulator is manufactured for the unfolding test. The deployment behaviors of the reflector are finally observed.

Microwave Properties of Organic-inorganic Composite Material Antenna with Various Fabrication Method of Conduction Material (전도체 형성 방법에 따른 유무기 복합재료 안테나의 고주파 특성)

  • Park, Sang-Hoon;Seong, Won-Mo
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.9
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    • pp.832-837
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    • 2006
  • Antennas were fabricated by physical(adhesive) and chemical(deposition+plating) method on organic-inorganic composite material. And antennas were measured dielectric constant and gain. Dielectric constant of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness and number of conduction material composition. But antennas were fabricated by chemical method was reached to 90 % of dielectric material. Gain of antennas were fabricated by physical method was decreased with increase of adhesive tape thickness. But they were unrelated with conduction material composition. The other side antennas were fabricated by chemical method excelled more 0.8 dBic than antennas were fabricated by physical method in gain of antenna. Finally, chemical method can expect excellent product process because it can produce smaller size, higher gain and elimination of many handworks.