Antenna Efficiency Measurement Using the Modified Wheeler Cap Method

개선된 Wheeler Cap 방식을 이용한 안테나 효율 측정

  • Cho Chi-Hyun (School of Electronic and Electrical Engineering, Hongik University) ;
  • Choo Ho-Sung (School of Electronic and Electrical Engineering, Hongik University) ;
  • Park Ik-Mo (Department of Electrical and Computer Engineering, Ajou University) ;
  • Kang Jin-Seob (Division of Physical Metrology, Korea Research Institute of Standards and Science)
  • 조치현 (홍익대학교 전자전기공학부) ;
  • 추호성 (홍익대학교 전자전기공학부) ;
  • 박익모 (아주대학교 전자공학부) ;
  • 강진섭 (한국표준과학연구원 기반표준부)
  • Published : 2006.04.01

Abstract

The conventional Wheeler cap method can extract the reliable efficiency of the antenna when the antenna operates as a simple series or parallel RLC circuit model. This method, however, may give an unreliable efficiency when the antenna under test has a complicated operating principle. In this paper, we revisit the conventional Wheeler cap method and propose a modified Wheeler cap method basedon the high-order circuit model. The proposed method can provide an accurate efficiency even for the antenna with a more complicated operating principle. Then we calculate efficiencies of other antennas with different operating principles and compare the results with the simulations.

References

  1. G. S. Smith, 'An analysis of the Wheeler method for measuring the radiation efficiency of antennas', IEEE Trans. Antennas Propagt., vol. 25, pp. 552-556, Jul. 1977 https://doi.org/10.1109/TAP.1977.1141615
  2. E. Newman, P. Hohley, and C. H. Walter, 'Two methods for the measurement of antenna efficiency', IEEE Trans. Antennas Propagat., vol. 23, pp. 457-461, Jul. 1975 https://doi.org/10.1109/TAP.1975.1141114
  3. H. A. Wheeler, 'The radiansphere around a small antenna', Proc. IRE, pp. 1325-1331, Aug. 1959
  4. 김기채, '소형 안테나의 방사효율 측정법', 한국전자파학회지 전자파기술, 14(4), pp. 18-23, 2003년 10월
  5. D. M. Pozar, B. Kaufman, 'Comparison of three methods for the measurement of printed antenna efficiency', IEEE Trans. Antennas Propagt., vol. 36, pp. 136-139, Jan. 1988 https://doi.org/10.1109/8.1084
  6. H. Choo, R. Rogers, and H. Ling, 'On the Wheeler cap measurement of the efficiency of microstrip antenna', IEEE Trans. Antennas Propagt., vol. 53, pp. 2328-2332, Jul. 2005 https://doi.org/10.1109/TAP.2005.850758
  7. IE3D Electromagnetic simulation and optimization software, Zeland Software, Inc
  8. Y. Kim, H. Ling, 'Equivalent circuit modeling of UWB antennas using a modified Cauchy method', IEEE USNC/URSI National Radio Science Meeting, Digest, p. 155, Jul. 2005