| Title |
Isolation Enhancement by the Non-connected Ground Structure for the Mobile Phone MIMO Antenna |
| Authors |
조영상(Jo, Young-Sang) ; 손태호(Son, Tae-Ho) |
| DOI |
https://doi.org/10.5370/KIEE.2016.65.6.1032 |
| Keywords |
Isolation ; Non-connected ground structure ; MIMO antenna ; ECC ; LTE |
| Abstract |
In this paper, the method of isolation enhancement for the mobile phone MIMO antenna of LTE class 40(2300~2400MHz) was studied. Design of MIMO antenna was based on the hybrid antenna that operates both a monopole and an IFA(Inverted F Antenna). A structure for the isolation enhancement which controls induced electric field on the ground plane is located between MIMO antenna, and was not connected with the ground but apart 0.3mm. A MIMO antenna that operates on class 3~40(1710~2400MHz) of LTE service bands and a structure for the isolation enhancement at the class 10 band were designed. VSWR measurement of implemented antenna on the FR4 board showed within 3:1 at entire design bands, and isolation between antennas at the class 40 band was less than -30dB. Isolation was enhanced more than 20dB by the studied structure. ECC(Envelope Correlation Coefficient) for MIMO performance was under 0.1, and antenna average gain and efficiency measured in the anechoic chamber were -4.28~-1.40dBi and 37.32~72.36% respectively. |