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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Design of Thin Frequency Selective Surface Superstrates for Dual-Band Directivity Enhancement

이중 대역 지향성 증가용 박판 주파수 선택적 표면의 설계

  • Lee Dong-Hyun (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology) ;
  • Lee Young-Ju (Mobile Communication Division, Samsung Electronics) ;
  • Yeo Jun-Ho (Telemetics USA Research Division, ETRI) ;
  • Mittra Raj (Department of Electronic and Electrical Engineering, Pennsylvania State University) ;
  • Park Wee-Sang (Department of Electronic and Electrical Engineering, Pohang University of Science and Technology)
  • 이동현 (포항공과대학교 전자전기공학과) ;
  • 이영주 (삼성전자 무선사업부) ;
  • 여준호 (한국전자통신연구원 텔레매틱스.USA 연구단) ;
  • ;
  • 박위상 (포항공과대학교 전자전기공학과)
  • Published : 2006.07.01
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Abstract

We propose a thin frequency selective surface(FSS) superstrate etched on a substrate for dual-band directivity enhancement, and present a design method of the superstrate. In the proposed new design, two FSS arrays with the same periodicity, but with different alignments are placed above and below a thin dielectric layer to overcome the problem of conventional superstrates for dual band directivity enhancements. Based on the unit-cell simulation, several important parameters that characterize the thin FSS superstrate are investigated, and the procedure for designing such a superstrate is described. We compare the resonant frequencies and the qualify factors of the unit cell with those of three FSS antenna composites with different quality factors, and identify the quality factors which support similar directivity enhancement at the dual-band directivity enhancement. It was found that there is an optimum FSS array size of a superstrate to enhance the directivity most efficiently. Measured results for a fabricated superstrate show a good agreement with the simulated ones.

본 논문에서는 하나의 유전체 층으로 이중 대역 지향성을 증가시킬 수 있는 박판 frequency selective surface (FSS) superstrate를 제안하고 이의 설계 방법을 소개하였다. 제안하는 박판 FSS superstrate는 동일한 주기의 두 FSS 어레이가 하나의 유전층 위 아래로 존재하고, 두 FSS 어레이의 위치에 offset 을 주어 이중 대역 지향성 향상을 위한 기존의 FSS superstrate가 가지는 문제점을 제거하였다. 단위 셀 시뮬레이션을 이용하여 다양한 파라미터의 변화에 따른 특성을 분석하고, 이를 이용하여 제안하는 superstrate의 설계 방법을 제시하였다. 3 가지 다른 quality factor를 가지는 단위 셀과 이를 이용한 복합 안테나의 특성을 비교하여 두 대역에서의 지향성 향상 정도를 유사하게 하는 단위 셀의 quality factor 값을 제시하였다. 이와 함께 효율적으로 지향성을 향상시킬 수 있는 최적의 FSS 어레이 크기를 제시하였다. 제안한 박판 FSS superstrate를 이용한 안테나 복합체를 제작하였으며, 측정된 결과는 시뮬레이션 된 결과와 매우 잘 일치한다.

Keywords

References

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