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- 저자 : Lee Junwen (검색결과 2 건)
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Lee, Kyu-Tae,Yao, Yuan,He, Junwen,Fisher, Brent,Sheng, Xing,Lumb, Matthew,Xu, Lu,Anderson, Mikayla A.,Scheiman, David,Han, Seungyong,Kang, Yongseon,Gumus, Abdurrahman,Bahabry, Rabab R.,Lee, Jung Woo,P National Academy of Sciences 2016 Proceedings of the National Academy of Sciences Vol.113 No.51
<P>Emerging classes of concentrator photovoltaic (CPV) modules reach efficiencies that are far greater than those of even the highest performance flat-plate PV technologies, with architectures that have the potential to provide the lowest cost of energy in locations with high direct normal irradiance (DNI). A disadvantage is their inability to effectively use diffuse sunlight, thereby constraining widespread geographic deployment and limiting performance even under the most favorable DNI conditions. This study introduces a module design that integrates capabilities in flat-plate PV directly with the most sophisticated CPV technologies, for capture of both direct and diffuse sunlight, thereby achieving efficiency in PV conversion of the global solar radiation. Specific examples of this scheme exploit commodity silicon (Si) cells integrated with two different CPV module designs, where they capture light that is not efficiently directed by the concentrator optics onto large-scale arrays of miniature multi-junction (MJ) solar cells that use advanced III-V semiconductor technologies. In this CPV+ scheme ('+' denotes the addition of diffuse collector), the Si and MJ cells operate independently on indirect and direct solar radiation, respectively. On-sun experimental studies of CPV+ modules at latitudes of 35.9886 degrees N (Durham, NC), 40.1125 degrees N (Bondville, IL), and 38.9072 degrees N (Washington, DC) show improvements in absolute module efficiencies of between 1.02% and 8.45% over values obtained using otherwise similar CPV modules, depending on weather conditions. These concepts have the potential to expand the geographic reach and improve the cost-effectiveness of the highest efficiency forms of PV power generation.</P>
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고한웅,리준문,유재덕,김세연,안병철,박동희,Ko Han-Woong,Lee Junwen,Yu Jae-Deok,Kim Se-Yon,Ahn Bierng-Chearl,Park Dong-Hee 한국전자파학회 2006 한국전자파학회논문지 Vol.17 No.1
본 논문에서는 인공위성의 원격 측정, 명령 및 제어(TT&C)용에 적합한 원뿔 나선 안테나의 설계 및 제작에 관해 검토하였다. $2.0{\sim}2.3\;GHz$ 대역에서 동작하며 반구면상에서 양호한 이득 특성과 축비 특성을 가지도록 나선의 형상을 상용 전자장 소프트웨어를 이용하여 최적 설계하였다. 원뿐 나선의 급전을 위한 동축선 무한 벌룬은 실험적인 방법으로 구현하였다. 설계된 나선의 형상을 정밀하게 제작하는 방법을 제시하였다. 설계한 안테나를 제작하여 측정한 결과 $2.0{\sim}2.3\;GHz$ 대역에서 -18 dB 이하의 반사 계수, 4 dB 이상의 이득, 이득이 0 dB 이상인 각도가 안테나 축으로부터 ${\pm}75^{\circ}$, 축비가 5 dB 이하인 각도가 안테나 축으로부터 ${\pm}90^{\circ}$, 15 dB 이상의 전후 방비 등 양호한 특성을 얻었다. In this paper, we investigate the design and fabrication of a conical spiral antenna suitable for satellite TT&C applications. The shape of the spiral is optimized using a commercial electromagnetic software for good gain and axial ratio performances over $2.0{\sim}2.3\;GHz$ frequencies. A coaxial infinite balun feeding the spiral is designed using experimental methods. A method for precision fabrication of the spiral is presented. Measurements of the fabricated antenna show satisfactory performances over $2.0{\sim}2.3\;GHz$ such as a reflection coefficient less than -18 dB, a maximum gain greater than 4 dB, a gain greater than 0 dB over angles ${\pm}75^{\circ}$ from the antenna boresight, an axial ratio less than 5 dB over angles ${\pm}90^{\circ}$ from the antenna boresight, a front-back ratio greater than 15 dB.
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