Journal of the Institute of Electronics Engineers of Korea TC (대한전자공학회논문지TC)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Study on the Enhancement of Isolation of the MIMO Antenna for LTE/DCS1800/USPCS1900 Handset

LTE/DCS1800/USPCS1900 단말기용 MIMO 안테나의 격리도 개선에 관한 연구

  • Cho, Dong-Ki (Engineering Research Institute, Gyeongsang National University) ;
  • Son, Ho-Cheol (Engineering Research Institute, Gyeongsang National University) ;
  • Lee, Jin-Woo (Antenna R&D Center, Karam-Solution Co,. Ltd.) ;
  • Lee, Sang-Woon (Antenna R&D Center, Karam-Solution Co,. Ltd.) ;
  • Lee, Mun-Soo (Engineering Research Institute, Gyeongsang National University)
  • 조동기 (경상대학교 공학연구원) ;
  • 손호철 (경상대학교 공학연구원) ;
  • 이진우 (가람솔루션 기술연구소) ;
  • 이상운 (가람솔루션 기술연구소) ;
  • 이문수 (경상대학교 공학연구원)
  • Received : 2010.04.21
  • Accepted : 2010.10.18
  • Published : 2010.10.25
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Abstract

In this paper, a MIMO antenna is proposed for LTE/DCSl800/USPCSl900 handset applications. The proposed antenna is based on the IFA and its wide bandwidth is obtained by using a stagger tuning technique. To improve the isolation, a suspended line is connected to the shorting points in two antennas, and capacitors and inductors are added to the connected suspended line. Two identical antennas of which dimension is 2.8cc($40{\times}10{\times}7mm$) are mounted on the two end lines of the system ground plane($40{\times}60mm$). Analysis of the antenna performance and optimization is performed using CST Microwave Studio. The bandwidths are satisfied for LTE band class 13(746-787MHz), class 14(758-798MHz) and DCSl800/USPCSl900 band (1710-1990MHz). The isolations between two antennas are about -12dB for LTE band and -10dB for DCSl800/USPCSl900 band. And the radiation efficiency of each antenna is about for LTE band 33% and 45% for DCSl800/USPCSl900 band respectively.

본 논문에서는 LTE/DCS1800/USPCS1900 단말기용 MIMO 시스템 안테나를 제안하였다. 제안한 안테나는 IFA 형태를 기본으로 하여 광대역 특성을 얻기 위해 스태거 튜닝법을 사용 하였다. 또한 두 안테나 사이의 격리도를 개선하기 위해 두 안테나의 shorting point 사이에 suspended line을 연결하고, 연결된 suspended line에 커패시터와 인덕터를 추가하였다. 2.8cc($40{\times}10{\times}7mm$) 크기의 동일한 두 안테나를 $40{\times}60mm$ 크기의 시스템 그라운드 양 끝에 배치하였다. 제안된 안테나의 최적화 및 안테나 특성은 CST Microwave Studio을 이용하여 연구하였다. 시뮬레이션 결과 대역폭은 LTE 대역 class 13(746-787MHz), class 14(758-798MHz) 및 DCS1800/USPCS1900(1710-1990MHz)를 만족하였고 안테나 사이의 격리도는 각각 -12dB 및 -10dB이었다. 안테나 방사 효율은 LTE 대역에서 33%, DCS1800/USPCS1900 대역에서 45% 이었다.

Keywords

References

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