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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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A Small Antenna of High Radiation Efficiency Employing a Ground Radiator

그라운드 방사체를 활용한 고효율의 소형 안테나

  • Choi, Hyeng-Cheul (Department of Electronics Computer Engineering, Hanyang University) ;
  • Lee, Hyung-Jin (Department of Electronics Computer Engineering, Hanyang University) ;
  • Park, Bum-Ki (Department of Electronics Computer Engineering, Hanyang University) ;
  • Jang, Jin-Hyuk (Department of Electronics Computer Engineering, Hanyang University) ;
  • Kim, Hyeong-Dong (Department of Electronics Computer Engineering, Hanyang University)
  • 최형철 (한양대학교 전자컴퓨터통신공학과) ;
  • 이형진 (한양대학교 전자컴퓨터통신공학과) ;
  • 박범기 (한양대학교 전자컴퓨터통신공학과) ;
  • 장진혁 (한양대학교 전자컴퓨터통신공학과) ;
  • 김형동 (한양대학교 전자컴퓨터통신공학과)
  • Received : 2011.07.28
  • Accepted : 2011.12.29
  • Published : 2012.02.29
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Abstract

This paper introduces the method to utilize a terminal ground as a radiator only using reactive components without an antenna structure. Characteristics of the proposed antenna is compared with that of the meander IFA on the same ground plane($40{\times}20mm^2$) for the bluetooth band. From simulation and measurement data, it is found that the proposed antenna using only capacitors provides the highest radiation efficiency. This is because of that the higher inductance reduces radiation resistance of a ground and the capacitor has a lower loss resistance comparing to that of the IFA or the inductor. In spite of the high radiation efficiency, the area ($5{\times}2.5mm^2$) of the proposed antenna is less than half of the area ($12{\times}2.5mm^2$) of the IFA.

본 논문은 안테나 구조 없이 리액티브 소자 만을 이용하여 단말기 그라운드를 방사체로 활용하는 방법을 소개한다. 안테나의 특성은 블루투스 대역에서 동일 그라운드 면적($40{\times}20mm^2$)을 가지는 미앤더 IFA와 비교하여 분석하였다. 시뮬레이션 및 측정을 통해 캐패시터 소자 만을 이용한 안테나가 가장 높은 방사 효율을 나타내는 것으로 판명되었다. 이는 안테나의 인덕턴스가 높을수록 그라운드의 방사 저항이 감소하고, 캐패시터의 손실 저항이 인덕터 또는 IFA보다 낮기 때문이다. 높은 방사 효율에도 불구하고 제안하는 안테나의 면적($5{\times}2.5mm^2$)은 IFA의 면적($12{\times}2.5mm^2$)의 반 이하이다.

Keywords

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