Korean Journal of Optics and Photonics (한국광학회지)

Optical Society of Korea (한국광학회)
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A New Type of Yagi-Uda Antenna for High Terahertz Output Power

고출력 테라헤르츠파 발생을 위한 새로운 구조의 Yagi-Uda 안테나

  • Han, Kyung-Ho (School of Electrical and Computer Engineering, Ajou University) ;
  • Park, Yong-Bae (School of Electrical and Computer Engineering, Ajou University) ;
  • Kim, Sang-In (School of Electrical and Computer Engineering, Ajou University) ;
  • Park, Ik-Mo (School of Electrical and Computer Engineering, Ajou University) ;
  • Lim, Han-Jo (School of Electrical and Computer Engineering, Ajou University) ;
  • Han, Hae-Wook (Department of Electrical and Computer Engineering, Pohang University of Science and Technology)
  • 한경호 (아주대학교 전자공학부) ;
  • 박용배 (아주대학교 전자공학부) ;
  • 김상인 (아주대학교 전자공학부) ;
  • 박익모 (아주대학교 전자공학부) ;
  • 임한조 (아주대학교 전자공학부) ;
  • 한해욱 (포항공과대학교 전자컴퓨터공학과)
  • Published : 2008.02.29
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Abstract

In this paper, a new type of Yagi-Uda antenna that operates in the terahertz frequencies is designed. The proposed Yagi-Uda antenna can obtain high input resistance of approximately $2000{\Omega}$ at the resonance frequency by using a full-wavelength dipole instead of a half-wavelength dipole as the driver element. The current leakage into the bias line was minimized by applying the photonic bandgap structure to the bias line. By designing the antenna on a thin substrate, the impedance lowering of an antenna caused by the relative dielectric constant of the substrate was prevented and the end-fire radiation pattern which is the original radiation characteristic of the Yagi-Uda antenna could be obtained. We expect that the proposed Yagi-Uda antenna can achieve increased terahertz output power by improving the impedance mismatching problem with the photomixer.

본 논문에서는 테라헤르츠 대역에서 동작하는 새로운 구조의 Yagi-Uda 안테나를 설계하였다. 제안한 Yagi-Uda 안테나는 안테나의 driver를 반 파장 다이폴이 아닌 전 파장 다이폴을 사용함으로써 공진주파수에서 $2000{\Omega}$ 정도의 높은 입력 저항을 얻을 수 있었다. 바이어스 선에 Photonic Bandgap 구조를 적용하여 바이어스 선로로의 전류누설을 최소화 하였고, 안테나를 얇은 기판에 설계함으로써 기판의 비유전율로 인한 안테나의 임피던스 저하를 막고 Yagi-Uda 안테나 고유의 단방향 지향적인 복사특성을 나타나게 하였다. 따라서 제안한 Yagi-Uda 안테나는 포토믹서와의 임피던스 부정합 문제를 개선하여 테라헤르츠파의 출력을 증가 시킬 수 있을 것이라 예상한다.

Keywords

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