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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Multi-Band Antenna Design by Controlling Characteristic of Third Order Mode

고차 모드 주파수 특성 제어 다중 대역 안테나

  • Yu, Jaekyu (Department of Electronic and Computer Engineering, Hanyang University) ;
  • Zhang, Rui (Department of Electronic and Computer Engineering, Hanyang University) ;
  • Liu, Yang (Department of Electronic and Computer Engineering, Hanyang University) ;
  • Lee, Jaeseok (Department of Electronic and Computer Engineering, Hanyang University) ;
  • Kim, Hyung-Hoon (Biomedical Engineering, Kwangju Women's University) ;
  • Kim, Hyeongdong (Department of Electronic and Computer Engineering, Hanyang University)
  • 유재규 (한양대학교 전자컴퓨터통신공학과) ;
  • 장서 (한양대학교 전자컴퓨터통신공학과) ;
  • 류양 (한양대학교 전자컴퓨터통신공학과) ;
  • 이재석 (한양대학교 전자컴퓨터통신공학과) ;
  • 김형훈 (광주여자대학교 보건의료공학과) ;
  • 김형동 (한양대학교 전자컴퓨터통신공학과)
  • Received : 2012.08.07
  • Accepted : 2012.11.14
  • Published : 2012.12.31
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Abstract

This paper presents a new method for designing a dual-band WIFI antenna using the third-order harmonic mode of a monopole antenna whose first-order mode operates at the low frequency band of WIFI. As analysing the current distribution of the third-order mode of this monopole antenna, the strongest point of electric field can be found. Then by attaching a stub at this point, the resonant frequency of the stub radiator can be adjusted from the third-order mode of the monopole antenna into the high frequency band of WIFI and the input impedance at this resonant frequency can be controlled with the width of the branch, without affecting the low frequency band of WIFI (the first-order mode of the monopole antenna). The compact dual-band antenna is designed at the size of an USB(universal serial bus) dongle and the bandwidth covers 600 MHz(2.3~3 GHz) at 2 GHz and 1 GHz(4.9~5.9 GHz) at 5 GHz under -10 dB which is satisfied with WLAN frequency. Efficiency of proposed antenna achieves over 50 % at WLAN frequency.

본 논문에서는 모노폴 안테나의 각 모드별 전계 분포를 분석하여 전류가 상대적으로 약한 부분(전계가 강한 부분)에 스터브를 이용해 기본 공진 모드에는 영향을 주지 않으면서 안테나의 하모닉 성분인 3차 모드 공진 주파수를 효율적으로 제어하고, 스터브의 두께를 조절하여 임피던스 특성을 조절할 수 있는 방법을 제안한다. 이 방법을 이용하여 일반적인 USB Dongle 크기($20{\times}45mm$)에 안테나를 설계하였으며, -10 dB 기준 2 GHz 대역에서 대역폭이 600 MHz(2.3~3 GHz), 5 GHz 대역의 대역폭은 1 GHz(4.9~5.9 GHz)로 WLAN 주파수 대역을 만족하는 성능과 50 % 효율이 달성되었다.

Keywords

References

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