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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Compensation Algorithm of Beamforming Error for Wideband Conformal Array Antenna

광대역 컨포멀 위상 배열 안테나의 빔형성 열화 보상 알고리즘

  • Yoon, Ho-Joon (Department of Electronic Convergence Engineering, Kwangwoon University) ;
  • Lee, Kang-In (Department of Electronic Convergence Engineering, Kwangwoon University) ;
  • Nam, Sang-Wook (Department of Electrical and Computer Engineering, Seoul National University) ;
  • Chung, Young-Seek (Department of Electronic Convergence Engineering, Kwangwoon University) ;
  • Yoon, Young-Joong (School of Electrical & Electronic Engineering, Yonsei University)
  • Received : 2017.04.04
  • Accepted : 2017.05.24
  • Published : 2017.06.30
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Abstract

In this paper, we propose an algorithm for the wideband beamforming in a conformal phased array antenna by compensating the errors. For the wideband beamforming, we used the True Time Delay(TTD), which was fabricated on the RF circuit board to obtain long delay lines. Beamforming errors in the conformal array antenna are the mutual coupling between the array elements, the dispersive error in the TTD circuit, and the quantization error by the digital control. We apply the compensation algorithm to the conformal phased array antenna of wideband 2~4 GHz, and verify the usefulness by comparing the results with the experiment results.

본 논문은 광대역 컨포멀 위상배열 안테나 빔형성 시 발생하는 조향오차를 보상하고, 목적하는 빔형성을 위한 알고리즘을 제안한다. 광대역 빔 조향을 위하여 본 연구에서는 TTD(True Time Delay) 방식을 채택하였으며, 긴 시간의 지연을 위하여 기판 회로상에 구현을 하였다. 빔 조향 오차의 원인은 배열 안테나 소자간의 상호간섭, 지연회로 기판의 분산 특성 및 디지털 제어에 의한 quantization 오차 등이 있다. 본 논문에서 TTD 회로의 분산 및 quantization 오차는 절대적인 지연시간보다 배열소자간의 상대적인 지연시간 차이를 최적화 하는 방향으로 분산 및 quantization 오차의 영향을 최소화하였다. 제안된 조향오차 보상기법을 2~4 GHz 대역의 컨포멀 위상배열 구조에 적용하여 측정값과 비교하여 그 타당성을 검증하였다.

Keywords

References

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