The Journal of the Korea institute of electronic communication sciences (한국전자통신학회논문지)

Korea Institute of Electronic Communication Science (한국전자통신학회)
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A Study on the Improvement of MIMO Antenna Isolation for Mobile Applications

휴대 단말기용 MIMO 안테나의 격리도 향상에 관한 연구

  • Received : 2015.08.10
  • Accepted : 2015.09.23
  • Published : 2015.09.30
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Abstract

In this paper, neutralization line structure have been employed to improve the isolation between the MIMO antenna system. The proposed MIMO antenna size is $116mm{\times}64mm{\times}5mm$ and designed on FR-4(${\varepsilon}r=4.4$) ground substrate. Neutralization line was applied to enhance isolation between the each antenna elements. The fabricated antenna satisfied a VSWR below 3 in LTE band B13 and the isolation between the MIMO antenna system is presented below -15dB. On the H-plane, antenna shows an omnidirectional pattern. In LTE band B13, the antenna presents a gain of a -2.6dBi ~-1.18dBi and radiation efficiency of 33.49% ~ 46.45%. Comparing measurement result with the outcome of simulation, the proposed MIMO antenna is expected to be applied for mobile application.

본 논문에서는 neutralization line 구조를 이용하여 안테나 간의 격리도를 향상시킨 MIMO 안테나 구조를 설계하였다. 제안된 MIMO 안테나 구조의 크기는 $116mm{\times}64mm{\times}5mm$이며, ${\varepsilon}r=4.4$인 FR-4 유전체를 사용하여 설계하였다. 또한 두 안테나 간의 격리도를 확보하기 위해 neutralization line을 추가하였다. 측정결과는 VSWR 3:1 기준으로 LTE B13 대역을 만족시켰고, 격리도를 -15 dB 이하로 확보하였다. H-평면에서 전방향성 방사특성을 나타내었으며, LTE B13 대역에서 -2.61 dBi에서 -1.18 dBi까지의 이득과 33.49 %에서 46.45 %까지의 방사효율을 얻었다. 측정결과와 시뮬레이션 결과를 비교하여 제안된 MIMO 안테나는 이동통신 휴대 단말기에 적용 가능함을 확인할 수 있다.

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References

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