한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

  • 제16권9호
  • /
  • Pages.949-956
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  • 2005
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  • 1226-3133(pISSN)
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  • 2288-226X(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
권호 표지

자기 아파인 프랙탈 구조를 이용한 CPW 급전 크로스 안테나

A CPW-Fed Self-Affine Cross Shape Fractal Antenna

  • 김태환 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 이재욱 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 조춘식 (한국항공대학교 항공전자 및 정보통신공학부) ;
  • 이윤현 (한국항공대학교 항공전자 및 정보통신공학부)
  • Kim Tae-Hwan (School of Electronics, Telecommunication and Computer Eng., Hankuk Aviation University) ;
  • Lee Jae-Wook (School of Electronics, Telecommunication and Computer Eng., Hankuk Aviation University) ;
  • Cho Choon-Sik (School of Electronics, Telecommunication and Computer Eng., Hankuk Aviation University) ;
  • Lee Yun-Hyun (School of Electronics, Telecommunication and Computer Eng., Hankuk Aviation University)
  • 발행 : 2005.09.01
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⟨ 이전 논문 다음 논문 ⟩

초록

본 논문에서는 처음으로, CPW(CoPlanar Waveguide) 급전을 이용한 자기 아파인(self-affine) 프랙탈 안테나를 제시한다. 제시된 새로운 구조는 비등방성 축척 대칭성으로 인해 자기 상사(self-similar) 구조를 이용한 프랙탈 안테나보다 더 작은 크기로 낮은 주파수 대역에서 공진을 일으키도록 설계할 수 있다. 반복 계수가 증가할수록 임피던스 정합 조건이 향상되고, 표면 전류가 흐를 수 있는 새로운 통로를 만들어 다중 대역 특성을 보이게 되며, 또한 첫 공진 주파수의 위치를 낮은 쪽으로 이동시킨다. 복사 패턴은 목표치인 단순 모노폴 안테나 특성과 유사하며 반복 계수가 3일 때의 이득은 940 MHz에서 측정치 2.27 dBi로 최대이다. FDTD 알고리즘에 기반을 두고 있는 CST Microwave Studio를 이용한 모의 실험 결과와 RT/Duroid 5880 기판을 이용하여 제작한 안테나의 측정 결과를 싣는다.

In this paper, a new CPW-fed cross shape fractal antenna having a self-affinity is presented. This novel configuration, which has anisotropic scaling symmetry, makes smaller profile characteristic compared to the fractal antenna using a self-similarity. Increase of the iteration coefficient, which leads to decrease of the fundamental resonant frequency, shows a good impedance matching condition and multi-band characteristics due to new surface current paths. The radiation patterns are similar to those of monopole antennas. In the K3 stage of iteration, the proposed antenna shows a measured maximum gain 2.27 dBi at 940 MHz. A commercially available software based on the FDTD algorithm has been used to obtain the predicted results. In addition, an RT/Duroid 5880 substrate has been employed for the experimental results.

키워드

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