Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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Four-leaf Clover-shaped Antenna for THz Photomixer for High Output Power

높은 출력의 THz 포토믹서를 위한 네잎클로버 형태의 안테나

  • Woo, In-Sang (Department of Electrical and Computer Engineering Ajou University) ;
  • Nguyen, Truong Khang (Department of Electrical and Computer Engineering Ajou University) ;
  • Park, Ik-Mo (Department of Electrical and Computer Engineering Ajou University) ;
  • Lim, Han-Jo (Department of Electrical and Computer Engineering Ajou University) ;
  • Han, Hae-Wook (Department of Electrical and Computer Engineering Pohang University of Science and Technology) ;
  • Chu, Hong (Laser Optek)
  • 우인상 (아주대학교 전자공학부) ;
  • ;
  • 박익모 (아주대학교 전자공학부) ;
  • 임한조 (아주대학교 전자공학부) ;
  • 한해욱 (포항공과대학교 전자컴퓨터공학과) ;
  • 주홍 (레이저옵텍)
  • Published : 2009.10.25
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Abstract

To improve the output power of a photomixer as a THz source, we propose a four-leaf clover-shaped antenna structure which is composed of a highly resonant radiation element and a stable DC feed element. The resonance characteristics of the proposed structure were investigated on a half-infinite substrate first as a simplified radiation environment in order to save the computation time. Based on the antenna characteristics on a half-infinite substrate, the antenna structure was designed to have a maximum total efficiency and a maximum directivity on an extended hemispherical lens. In comparison with a full-wavelength dipole, an input resistance of this structure increased six fold and this characteristic significantly improved the mismatch efficiency between a photomixer and an antenna. THz output power from this structure is expected to increase by 2.7 times as compared to a full-wavelength dipole case.

테라헤르츠 광원인 포토믹서의 출력을 향상시키기 위하여 강한 공진의 복사부와 안정적인 DC 급전부로 구성된 네잎클로버 형태의 새로운 안테나구조를 제안하였다. 먼저 복사환경을 단순화시킨 무한기판 위에서 제안한 안테나구조의 공진특성을 살펴보았고, 이를 바탕으로 제안한 구조가 확장형 반구렌즈 위에서 최대의 전체효율과 지향성을 지니도록 설계하였다. 기존의 전파장다이폴안테나와 비교한 결과, 제안한 구조는 공진주파수에서 6배 이상의 높은 입력임피던스 특성을 가짐으로써 포토믹서와의 부정합효율을 크게 개선시켰으며, 이로 인해 테라헤르츠 출력이 전파장 다이폴의 경우보다 2.7배 높게 예상되었다.

Keywords

References

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