A Wideband Circularly Polarized Microstrip MIMO Antenna for LTE Systems Application

Xiao Songsong; Wang Weidong

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A Wideband Circularly Polarized Microstrip MIMO Antenna for LTE Systems Application

Xiao Songsong #,Wang Weidong *

School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876

*Correspondence author

#Submitted by

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Funding: National Science and Technology Major Project of China （No.No. 2012ZX03003001）

Opened online:24 December 2014

Accepted by: none

Citation: Xiao Songsong,Wang Weidong.A Wideband Circularly Polarized Microstrip MIMO Antenna for LTE Systems Application[OL]. [24 December 2014] http://en.paper.edu.cn/en_releasepaper/content/4624171

A wideband circularly polarized (CP) microstrip multiple-input-multiple-output (MIMO) antenna for long term evolution (LTE) systems is proposed. Wideband feed network (WFN) based on coupled-line power divider and phase shifter is introduced to provide two ways of orthogonal signal. Then a square patch loaded with quad-symmetrical slots produces the CP radiation. A unit-cell of frequency selective surfaces (FSS) structure is utilized to enhance the antenna gain. In order to enhance the isolation between the antenna elements and then improve the system performance, polarization diversity is employed. The proposed MIMO antenna is fabricated and measured. The measurement results indicate that S11 < -15 dB impedance bandwidth of 46% from 1.85 to 2.95 GHz, 3-dB axial ratio (AR) bandwidth of 40% from 1.9 to 2.85 GHz, and peak gain of 4.2 dBi are achieved. In addition, diversity performance in terms of envelope correlation coefficients (ECC) and mean effective gain (MEG) is also verified.

Keywords:Wireless communication; circular polarization; microstrip antenna; multiple-input multipe-output (MIMO) antenna; polarization diversity

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