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저궤도 소형위성 탑재용 빔 조향 능동 다이폴 안테나 설계

Design of active beam steering antenna mounted on LEO small satellite

  • 투고 : 2016.09.02
  • 심사 : 2016.10.07
  • 발행 : 2016.10.31

초록

본 논문에서는 저궤도 소형위성에 탑재하여 빔 조향을 능동적으로 할 수 있는 다이폴 안테나를 설계하였다. 제안된 안테나는 야기-우다 안테나의 원리를 기반으로 하였으며, 2개의 무급전 기생소자를 T자형으로 형성시켜 수직소자의 길이를 고정시킨 후 수직소자의 끝단에서의 open, short에 따라 도파기 또는 반사기로 작동되게 하였다. 설계된 안테나는 UHF 대역의 436.5 MHz를 중심으로 위성-위성 간과 위성-지상 간의 링크버짓을 통해 안테나의 목표 이득을 정하였다. 안테나 특성을 향상시키기 위해 무급전 기생소자의 수직소자인 transformer의 길이를 변경시켰으며, transformer의 길이가 ${\lambda}/4$보다 ${\lambda}/2$일 때 최대 빔 방향 이득이 0.5 dB 향상되었다. 실제 ${\lambda}/2$ transformer 제작 시에는 무급전 기생 소자의 open, short를 다이오드와 캐패시터, 인덕터로 구성된 on/off switch를 이용하여 구현하였다. 그 결과 위성-위성 간 이득은 평균 5.92 dBi로 나타났으며 위상-지상 간 이득은 평균 0.99 dBi로 확인되어 링크버짓을 통해 정한 목표 스펙을 충분히 만족하였다.

In this paper, the dipole antenna that can control a beam steering were designed for attaching on LEO(Low Earth Orbit) small satellite. The proposed antenna was based on Yagi-Uda antenna. The parasitic element was proposed as a T-shape. Depending on the state of open or short at the end of a vertical element, we can choose a characteristic of the parasitic element with fixing a vertical element length of the parasitic element. Using this characteristic, we designed the director element and reflector element. The proposed antenna was designed to receive UHF 436.5 MHz. Antenna gain was chosen by link budget between one satellite and the other satellite or between the satellite and the ground station. By changing a vertical element length which is the largest variable that chooses an antenna characteristic, we confirmed that ${\lambda}/2$ length transformer has a result that improve 0.5 dB in comparison ${\lambda}/4$ length transformer from maximum gain direction. In production, we made an on/off switch composed of a diode, capacitor, and inductor control an open and short at the end of the parasitic element. As a result, the gain of antenna used in a link between one satellite and the other satellite had average 5.92 dBi. And the gain of antenna used in a link between the satellite and the ground station had average 0.99 dBi.

키워드

참고문헌

  1. H. K. Lee, Y. U. Park. H. K. choi, "Design of X-band Phased Array Antenna Systems for Satellite Communication," 2016 10th European Conference on, 2016, The Journal of The Institute of Webcasting, Internet Television and Telecommunication, Vol. 1, No. 1, 2005
  2. P. R. Akbar, H. Saito, M. Zhang, "Parallel -Plate Slot Array Antenna for Deployable SAR Antenna Onboard Small Satellite," IEEE Transactions on Antennas and Propagation, Vol. 64, pp. 1661-1671, 2016 https://doi.org/10.1109/TAP.2016.2536164
  3. J. Costantine, K. Y. Kabalan, A. E. Hajj, Y. Tawk, C. G. Christodoulou, "A reconfi- gurable/deployable helical antenna for small satellites," Antennas and Propagation Society International Symposium (APSURSI), 2013 IEEE, 2013
  4. C. J. Vourch, T. D. Drysdale, "V-band Bull's eye antenna for CubeSat applications," IEEE Antennas and Wireless Propagation Letters, Vol. 13, pp. 1092-1095, 2014 https://doi.org/10.1109/LAWP.2014.2327852
  5. H. Isel, Y. Kurt, O. Yilmaz, F. A. Tunc, O. Ceylan, H. B. Yagci, "435 MHz monopole antenna design for Turksat - 3USAT nano satellite," Signal Processing and communica- tions Applications (SIU), 2011 IEEE 19th Conference on, 2011
  6. G. J. Lee, D. J Woo, T. K. Lee, J. W. Lee, W. K. Lee, "TT&C Antenna Design for LEO Satellite," The Journal of Korean Institute of Electromagnetic Engineering and Science, Vol. 21, no. 6, pp. 642-650 https://doi.org/10.5515/KJKIEES.2010.21.6.642
  7. D. M. Pozar, "Microwave Engineering 4rd edition," Wiley, 2012