높은 출력의 THz 포토믹서를 위한 네잎클로버 형태의 안테나
Four-leaf Clover-shaped Antenna for THz Photomixer for High Output Power
0
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
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 살펴보 았고, 이를 바탕으로 제안한 구조가 확장형 반구렌즈 위에서 최대의 전체효율과 지향성을 지니도록 설계하였다. 기존의 전파장 다이폴안테나와 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.
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.
참고문헌 (27)
- A. Markelz, "THz time domain spectroscopy of biomolecular conformation modes", Phys. Med. Biol., 47, pp.3797~3805 (2002)
- B. B. Hu, "Imaging with terahertz waves", Opt. Lett., 20, pp.1716~1718 (1995)
- 오승재, "테라헤르츠 전자기파 펄스의 변조를 이용한 이미징의 해상도 연구", 한국광학회지, 15(1), pp.46~50 (2004), 한국광학회
- I. H. Maeng, "Optical properties of human tooth in terahertz frequency region", in Proc. OSK Annual Meeting (Univ. of Seoul, Korea), pp.529~530 (2009)
- E. Jung, "Terahertz pulse imaging of articular cartilage tissues", in Proc. OSK Summer Meeting (Jeju Univ.), pp.529~530 (2006)
- T. Kleine-Ostmann, "Audio signal transmission over THz communication channel using semiconductor modulator", Electron. Lett., 40, pp.124~126 (2004)
- D. H. Auston, "Picosecond photo-conducting hertzian dipoles", Appl.Phys.Lett., 45, pp.284~286 (1984)
- B. B. Hu, "Free-space radiation from electro-optic crystals", Appl.Phys.Lett., 56, pp.506~508 (1990)
- 진윤식, "ZnTe 결정을 이용한 테라헤르츠파의 발생 및 검출 특성", 한국광학회지, 16(6), pp.553~559 (2005), 한국광학회
- E. R. Brown, "Coherent millimeter-wave generation by heterodyne conversion in low-temperature-grown GaAs photoconductors", J. Appl. Phys., 73, pp.1480~1484 (1993)
- E. Brundermann, "Terahertz emission of population-inverted hot-holes in single-crystalline silicon", Appl. Phys. Lett., 73, pp.723~725 (1998)
- 이병철, "자유전자레이저의 개발현황과 전망", 한국진공학회지, 15(5), pp.435~450 (2006), 한국진공학회
- R. Kohler, "Terahertz semiconductor-heterostructure laser", Nature, 417, pp.156~159 (2002)
- E. Linfield, "Terahertz application: A source of fresh hope", Nature Photonics, 1, pp.257~258 (2007)
- R. E. Miles, "Terahertz Frequency Detection and Identification of Materials and Objects", pp.167~184 (2007), Springer
- O. Morikawa, "Sub-THz emission properties of photoconductive antennas excited with multimode laser diode", Jpn. J. Appl. Phys., 38, pp.1388~1389 (1999)
- S. M. Duffy, "Accurate modeling of dual dipole and slot elements used with photomixers for coherent terahertz output power", IEEE Tans. Microwave Theory Tech., 49, pp.1032~1038 (2001)
- K. Moon, "Terahertz folded half-wavelength dipole antenna for high output power", in Proc. International Topical Meeting on Microwave Photonics (Seoul, Korea), pp.301~304 (2005)
- 한경호, "높은 입력 임피던스를 가지는 테라헤르츠 Yagi-Uda 안테나", 한국광학회지, 20(2), pp.65~70 (2009), 한국광학회
- U. D. Keli, "High-speed coplanar transmission line", IEEE J. Quantum Electron., 28, pp.2333~2342 (1992)
- S. Y. Chou, "Tera-hertz metal-semiconductor-metal photodetectors with 25 nm finger spacing and finger width", Appl. Phys. Lett., 61, pp.477~479 (1992)
- M. Kominami, "Dipole and slot elements and arrays on semi-infinite substrate", IEEE Trans. Antennas Propagat., 33, pp.600~607 (1985)
- C. A. Balanis, "Antenna Theory: Analysis and Design", pp.60~61 (1997), Wiley
- K. Moon, Ph. D, "Thesis", pp.59~73 (2007), Pohang Univerisity of Science and Technology
- K. J. Button, "Infrared and Millimeter Waves", pp.1~90 (1983), Academic Press
- D. F. Filipovic, "Double-slot antennas on extended hemispherical and elliptical silicon dielectric lenses", IEEE Trans. Microwave Theory Tech., 41, pp.1738~1749 (1993)
- M. J. M. van der Vorst, "Effect on internal reflection on the radiation properties and input admittance of integrated lens antennas", IEEE Trans. Microwave Theory Tech., 47, pp.1696~1704 (1999)