In order to increase the channel capacity of airborne communication equipment and further reduce the installation space of the antenna, an Ultra WideBand (UWB) Multiple Input Multiple Output (MIMO) antenna with angle diversity is proposed. This antenna integrates Vivaldi antenna and UWB slot antenna to obtain high port isolation without adopting the decoupling structure, greatly improving the data transmission rate. The size of the antenna can be effectively reduced by opening a pair of square slots on the Vivaldi antenna arm and adding a rectangle radiating patch on the back of the dielectric plate. The size of the designed UWB-MIMO antenna is 36 mm×36 mm×0.8 mm. The design process of the antenna is given, and the antenna is fabricated and measured. The simulated and measured results show that the MIMO antenna has an ultra wide impedance bandwidth and can cover the entire 3.1 to 10.6 GHz UWB. The impedance bandwidth of the Vivaldi antenna is 2.8 to 15.9 GHz and the impedance bandwidth of the UWB slot antenna is 1.8 to 12.7 GHz. The port isolation of the antenna is below -10 dB. The radiation performance and gain characteristics of the antenna are measured. The measured results are in good agreement with the simulated results, which proves the effectiveness of the antenna. The antenna can be applied to UWB wireless communication system and airborne array antenna system.
LI Zhenya
,
ZHU Xiaosong
,
YIN Chengyou
,
WU Wei
,
WANG Yong
. Design of airborne ultra wideband MIMO antenna based on angle diversity[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019
, 40(5)
: 322552
-322552
.
DOI: 10.7527/S1000-6893.2018.22552
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