A Reconfigurable MIMO/UWB MIMO Antenna for Cognitive Radio Applications

被引:58
|
作者
Zhao, Xiongwen [1 ]
Riaz, Sharjeel [1 ]
Geng, Suiyan [1 ]
机构
[1] North China Elect Power Univ, Sch Elect & Elect Engn, Beijing 102206, Peoples R China
关键词
Cognitive radio (CR); frequency reconfigurable antenna; MIMO; PIN diodes; ultrawideband (UWB); varactor diode; SENSING ANTENNA; SLOT ANTENNA; SYSTEM;
D O I
10.1109/ACCESS.2019.2909810
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
A novel multi-mode frequency reconfigurable MIMO and an ultrawideband (UWB) MIMO antenna design for cognitive radio applications is proposed in this paper. The antenna structure contains two modified triangular-shaped printed monopole antenna elements and a combination of varactor and PIN diodes. The proposed antenna has three operating modes: UWB mode for spectrum sensing, a frequency reconfigurable MIMO mode for communication over different frequencies, and UWB antenna operating in MIMO configuration. The UWB mode and reconfigurable communication mode are obtained by utilizing different switching ON/OFF states of PIN and varactor diodes. In the UWB mode, the antenna can cover the spectrum from 1 to 4.5 GHz, while it achieves the frequency reconfigurability over a wide range from 0.9 to 2.6 GHz using varactor diode tuning in the reconfigurable communication mode. The proposed antenna has a compact and planar structure with overall dimensions of 120 x 60 x 1.5 mm(3). The proposed design also exhibits good MIMO performance; the minimum isolation measured is 12.5 dB, while the envelope correlation coefficient (ECC) of less than 0.19 is achieved for the whole operating band. To validate the proposed concept, the prototype of the antenna system is fabricated and measured. The simulation results are in good agreement with the measurement results.
引用
收藏
页码:46739 / 46747
页数:9
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