• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.802-805
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• 2003

Structural surface becomes an antenna. The integration of antennas into structural body panels is a new high payoff technology. It emerged from the need to improve structural efficiency and antenna performance. In this paper, we developed new design concept for the structural surface which transmits and receives the electromagnetic signals, and it is termed Surface-Antenna-Structure (SAS). Design procedure was presented including structure design. material selection and design of antenna elements, which was processed according to the communication with KORSAT satellite at Ku-Band (12.25-12.75 GHz). The final demonstration article was 350$\times$200$\times$7.5mm flat antenna panel. Experimental results for antenna performances were in good agreements with design requirements. Also structural analysis was performed with SAS. estimating stress distributions under simply supported condition with Laminated Plate Theories and Wavier Solutions. The SAS concept can be extended to give a useful guide to manufacturers of structural body panels as well as antenna designers. promising innovative future communication technology.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 추계학술발표대회 논문집
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• pp.1-4
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• 2002

The present study aims to design a multiplayer microstrip antenna with composite sandwich construction and to estimate structural behavior of this multiplayer structure for the next generation of structural surface technology. This is termed Surface-Antenna-Structure indicating that structural surface becomes antenna. Constituent materials were selected considering electrical properties as well as mechanical properties. For the antenna performance, antenna elements inserted into structural layers were designed for satellite communication at a resonant frequency of 12.5 GHz and final demonstration article was $16\times16$ array antenna. From electrical measurements it was shown that antenna performances were in good agreement with design requirements. Structural analysis showed this antenna structure was well designed for the mechanical rigidity. All constituent materials were characterized independently. The SAS concept is the first serious attempt at integration for both antenna and composite engineers and promises innovative future communication technology.

• Advanced Composite Materials
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• 제17권3호
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• pp.215-224
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• 2008

The present study aims to design a multilayer microstrip antenna with composite sandwich construction and investigate fatigue behavior of this multilayer SAS (surface antenna structure) that was asymmetric sandwich structure for the next generation of structural surface technology. This term, SAS, indicates that the structural surface becomes an antenna. Constituent materials were selected considering electrical properties, dielectric constant and tangent loss as well as mechanical properties. For the antenna performance, antenna elements inserted into structural layers were designed for satellite communication at a resonant frequency of 12.2 GHz. 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 the SAS was obtained. The experimental results of bending fatigue were compared with single load level fatigue life prediction equations and in good agreement. The SAS concept is can be extended to give a useful guide for manufacturers of structural body panels as well as antenna designers.

• 한국정보통신학회논문지
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• 제19권1호
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• pp.13-18
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• 2015

본 연구는 특정 안테나의 구조 변경을 통해 원하는 주파수 대역에서 이중대역 특성이 가능하도록 하는 안테나 구조 설계에 관한 연구이다. 대상 안테나는 광대역 특성을 가지는 십자형 평판 모노폴 안테나이고, 목표 주파수 대역은 ISM 2.45GHz/5.8GHz 이다. 이를 위해 몸체 안테나인 십자형 평판 모노폴 안테나에 추가적인 안테나 소자를 부가한 후 안테나의 길이와 모양을 임의대로 변경하기 위한 조정변수를 설정하여 목표 값에 접근하도록 다양한 시뮬레이션을 실시하였다. 시뮬레이션 결과 ISM 2.45GHz/5.8GHz에서 기준 이상의 대역폭과 이득을 얻을 수 있었다. 본 연구에서 시도한 안테나 구조 변경을 위한 조정변수의 도입은 이중대역(다중대역) 특성을 가지는 안테나 개발시 하나의 유용한 사례가 될 수 있다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 춘계학술발표대회 논문집
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• pp.195-198
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• 2002

Two types of conformal load-bearing antenna structure (CLAS) were designed with microwave composite laminates and Nomex honeycomb cores, to give both structural rigidity and good electrical performance. One is 4$\times$8 array for Synthetic Aperture Radar(SAR) system and the other is $5\times2$ array for wireless LAN system. Design was based on wide bandwidth, high polarization purity, low loss and good structural rigidity. We studied the design, fabrication and structural/electrical performances of the antenna structures. The flexural behavior was observed under a 3-point bending test, an impact test, and a buckling test. Electrical measurements were in good agreement with simulation results and these complex antenna structures have good flexural characteristics. The design of this antenna structure is extended to give a useful guide for sandwich panel manufacturers as well as antenna designers.

• 항공우주시스템공학회지
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• 제12권2호
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• pp.37-45
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• 2018

차세대 중형위성에 탑재되는 2축 짐벌식 안테나는 고해상도 영상정보를 효율적으로 지상국에 송신하기 위해 적용된다. 본 연구에서는 발사 진동환경에서 상기 2축 짐벌식 안테나의 구조 건전성을 보장하기 위해 발사구속장치의 적용을 포함한 구조설계를 수행하였으며, 이에 대한 설계유효성을 입증하고자 구조해석을 실시하였다. 우선 모드 해석을 통해 발사 및 궤도환경 하에서 발사구속장치가 각각 구속 및 해제됨에 따른 안테나의 동적응답특성을 예측하였다. 또한 준정적 해석을 통해 안테나 조립체에 대한 구조 건전성을 검토하였으며, 안테나 기저면과 위성체간의 체결부 I/F에 적용된 볼트에 대한 구조 건전성을 검토하였다. 마지막으로 발사구속장치의 구속력에 따라 Ball & Socket Interface의 소켓과 볼트머리 간에 발생하는 이격 (Gapping)을 비롯해 상기 Interface에 적용된 볼트 자체의 안전여유를 산출하여 발사구속장치의 적정 구속력 범위를 결정하였다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2000년도 추계학술발표대회 논문집
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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.

• Journal of Astronomy and Space Sciences
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• 제40권4호
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• pp.225-235
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• 2023

This paper presents the structural design of a planar synthetic aperture radar (SAR) antenna applied to a microsatellite. For micro-satellite applications, the SAR antenna structure must be lightweight, flat, and designed to withstand the launch environment. To satisfy these conditions, our novel antenna structure was designed using aluminium (AL) alloy. Structural analysis was performed for quasi-static load, random vibration, and shock load to verify its robustness in the launch environment, and the results are presented here.

• Composites Research
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• 제37권1호
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• pp.53-57
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• 2024

무선 기술의 발전으로 많은 시스템이 개발되었으며, 항공기에 이러한 시스템을 효과적으로 적용하기 위해 다양한 형태의 구조 안테나가 연구되어 왔다. 현재까지 대다수의 구조 안테나 연구는 패치 안테나를 중심으로 이루어졌으나, 패치 안테나는 좁은 주파수 대역과 낮은 지향성의 단점을 가지고 있다. 반면, 최근 무선 분야에서 널리 사용되는 비발디 안테나는 넓은 주파수 대역과 우수한 지향성을 갖고 있지만, 방사 방향의 제약으로 인해 항공기 구조에 효과적으로 적용하는 데 어려움이 있었다. 본 연구에서는 비발디 안테나를 항공기 구조에 적용하기 위해 허니콤의 구조에 비발디 안테나를 적용하여 방사 방향의 문제를 해결하고자 하였고, 시뮬레이션을 통해 허니콤 구조가 안테나에 주는 영향을 분석하여 허니콤 비발디 안테나의 가능성을 검증하였다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 춘계학술대회 논문집
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• pp.1647-1650
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• 2003

The Objective of this work was to design Surface Antenna Structure (SAS) and investigate fatigue behavior of SAS that was asymmetric sandwich structure. This term, SAS, indicates that structural surface becomes antenna. Constituent materials were selected considering electrical properties, dielectric constant and tangent loss as well as mechanical properties. For the antenna performance, SSFIP elements inserted into structural layers were designed for satellite communication at a resonant frequency of 12.5 GHz and final demonstration article was 16${\times}$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 lift curve of SAS was obtained. The fatigue load was determined experimentally at a 0.75(1.875kN) load level. SAS concept is the first serious attempt at integration for both antenna and composite engineers and promises innovative future communication technology.