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- 저자 : 서윤덕(Yoon-Dug Seo) (검색결과 2 건)
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서윤덕(Yoon-Dug Seo),윤금노(Keum-No Yoon),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.5
This paper proposes an antenna suitable for projectile telemetry applications. The operating frequency of the ceramic patch antenna currently used for projectile applications can easily be shifted out of the desired frequency range due to the very narrow bandwidth of the ceramic patch. The proposed antenna consists of a printed and inverted triangular monopole, a sleeve and a ground plane. Antenna performances according to design parameters are analyzed from which optimum dimensions of the antenna are derived. The sleeve monopole is realized on an FR-4 substrate of 10mm width and 30㎜ height and placed at the center of a ground plane of 28㎜ diameter. Measurements of the fabricated antenna show favorable performances such as a 3.74㏈i maximum gain, a reflection coefficient less than -10㏈ over 1.62-3.25㎓ and an omnidirectional azimuth pattern.
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이제선(Jae-Sun Lee),서윤덕(Yoon-Dug Seo),이순천(Soon-Chun Lee),방재훈(Jae-Hoon Bang),안병철(Bierng-Chearl Ahn) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.8
In this paper, we propose a dielectric chip antenna with its metal patterns printed on a circuit board. In a typical dielectric chip antenna, metal patterns are formed on the surface or interior of a material block of high dielectric constant. In this paper, metal patterns of a dielectric chip antenna are printed on the circuit board where the chip antenna is to be mounted, and a dielectric material block is placed on top of metal patterns, resulting in a low-cost dielectric chip antenna structure. Antenna electrode patterns are printed on a 33×30㎜ FR-4 substrate, which are then covered with a dielectric material of size 12×5×0.4㎜ and dielectric constant 22, resulting in a structure equivalent to a dielectric chip antenna with metal patterns formed on the bottom surface. The optimum design of the antenna is obtained using a commercial software. The designed antenna is fabricated and tested. The fabricated antenna shows a reflection coefficient less than -10㏈ over 225㎒ bandwidth centered at 2.45㎓, a maximum gain of 1.98㏈i, an average gain of -0.19㏈i, and a maximum- to-minimum gain difference of 9.98㏈.
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