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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Analysis of Cassegrain Dual Offset Reflectors for Compact Payload Test Range

CPTR용 카세그레인 오프셋 복 반사경의 해석

  • Published : 2008.01.31
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Abstract

In general, the cassegrain dual offset reflector is used for the satellite communication antenna, but is analyzed as the reflector system for the CPTR(Compact Payload Test Range) facility in here. The near-field at the test zone of the CPTR is obtained by using the physical optics approximation. The CPTR has to provide a uniform plane wave with the minimum amplitude and phase ripple and the low cross polarization. Therefore, in this paper, the near-field pattern are calculated, and the ripple and taper of the field and the cross polarization are investigated with the variation of the reflector geometry and the position of the test region. Especially, the cross polarization of the antenna axis direction which is not found in the satellite reflector antennas is investigated.

일반적으로 카세그레 인 오프셋 복 반사경(Cassegrain Dual Offset Reflector)은 위성 통신용 안테나로 사용되지만, 여기서는 CPTR(Compact Payload Test Range)을 위한 반사경 시스템으로 해석하였다. 시험 영역의 근접 전계는 물리 광학법(Physical Optics)을 적용하여 계산하였다. CPTR은 균일한 평면파 제공을 목적으로 하며, 이를 위해 최소한의 진폭과 위상 리플(ripple)을 가져야 하며, 교차 편파 또한 작아야 한다. 따라서 본 논문에서는 반사경 구조 및 시험 영역의 위치에 따른 근접 전계 패턴을 구하여 전계의 리플, 테이퍼와 교차 편파를 고찰하였다. 특히 통신용 반사경 안테나에서는 나타나지 않는 안테나 축방향의 교차 편파 성분을 고찰하였다.

Keywords

References

  1. W. H. Kummer, E. S. Gillespie, 'Antenna measurements-1978', Proc. IEEE, vol. 66, no. 4, pp. 483-507, Apr. 1978 https://doi.org/10.1109/PROC.1978.10940
  2. W. H. Emerson, 'Electromagnetic wave absorbers and anechoic chambers through the years', IEEE Trans. Antennas and Propagat., AP-21, no. 4, pp. 484-490, Jul. 1973
  3. V. Galindo-Israel, W. Imbriale, and R. Mittra, 'On the theory of the synthesis of single and dual offset-shaped reflector antenna', IEEE Trans. Antennas and Propagat., AP-35, pp. 887-896, Aug. 1987
  4. T. S. Chu, R. H. Turrin, 'Depolarization properties of offset reflector antennas', Trans. Antennas and Propagat., AP-21, no. 3, pp. 339-345, May 1973
  5. J. Dijk et al., 'The polarization losses of offset paraboloid antennas', Trans. Antennas and Propagat., AP-22, no. 4, pp. 513-520, Jul. 1974
  6. W. A. Wong, 'On the equivalent parabola technique to predict the performance characteristics of a Cassegrain system with an offset feed', Trans. Antennas and Propagat., AP-21, no. 3, pp. 335-339, May 1973
  7. W. V. T. Rush, A. Prata, Y. Rahmat-Samii, and R. A. Shore, 'Derivation and application of the equivalent paraboloid for classical offset Cassegrain and Gregorian antennas', Trans. Antennas and Propagat., AP-38, pp. 1141-1149, Aug. 1990
  8. Y. Mizugutch, M. Akagawa, and H. Yokoi, 'Offset dual reflector antenna', in Dig. IEEE Int. Symp. Antennas Propagat., 1976
  9. H. Tannaka, M. Mizusawa, 'Elimination of cross- polarization in offset dual reflector antennas', Elec. and Comm. in Japan, vol. 58-B, no. 12, pp. 71-78, 1975
  10. R. C. Johnson, 'Determination of far field antenna patterns from near field measurements', Proc. IEEE, vol. 61, no. 12, pp. 1668-1698, Dec. 1973 https://doi.org/10.1109/PROC.1973.9358
  11. N. A. Adatia, 'Diffraction effects in dual offset Cassegrain antenna', in Dig. IEEE Int. Symp. Antennas Propagat., AP-Session 10, pp. 235-238, May 1978
  12. C. W. Pistorius, W. D. Burnside, 'An improved main reflector design for compact range reflector', Trans. Antennas and Propagat., AP-35, pp. 342- 347, Mar. 1987
  13. I. J. Gupta, D. G. Brown, W. D. Burnside, and W. Lin, 'A serrated edge Gregorian subreflector for dual chamber compact range systems', Trans. Antennas and Propagat., AP-39, pp. 1258-1261, Aug. 1991
  14. W. D. Burnside, M. C. Gilreath, and B. Kent, 'A rolled edge modification of compact range reflectors', Proc. 1984 AMTA Symposium, San Diego, CA., session 4B, Sep. 1984
  15. C. Dragone, 'Offset multireflector antennas with perfect pattern symmetry and polarization discrimination', Bell Syst. Tech. J., vol. 57, pp. 2663-2684, Sep. 1978 https://doi.org/10.1002/j.1538-7305.1978.tb02171.x
  16. K. W. Brown, A. Prata Jr., 'A design procedure for classical offset dual reflector antennas with circular apertures', IEEE Trans. Antennas Propagat., AP-42, no. 8, pp. 1145-1153, Aug. 1994
  17. H. F. Schluper, 'Compact antenna test range analysis using physical optics', Proc. 1987 AMTA meeting, FL., pp. 309-312, 1987
  18. 최학근, '오프셋 반사경 안테나의 빔 스캔 특성 해석, 한국전자파학회논문지, 10(2), pp. 207-217, 1999년 4월
  19. Y. T. Lo, S. W. Lee, Antenna Handbook, ch. 15, New York, Van Nostrand Reinhold Company Inc., 1988