Purpose

This study aims to propose a two-element multi-input-multi-output (MIMO) antenna for cognitive radio MIMO applications to avoid the complexities involved in reconfigurable antennas and improve the spectrum utilization efficiency.

Design/methodology/approach

The proposed MIMO antenna system comprises a wideband antenna that operates at 2 GHz–12 GHz for sensing the spectrum and four pairs of antennas for communication, which are single and dual-band antennas. Each pair of antennas meant for communication consists of two similar antennas. Moreover, the antennas meant for communication cover 93% of the bandwidth of the sensing antenna.

Findings

The first pair of antennas accessible at ports P2 and P6 and the second pair of antennas accessible at ports P4 and P8, which are dual-band antennas, operate at 3.05 GHz–3.85 GHz, 5.8 GHz–8 GHz and 2.05 GHz–2.55 GHz, 4.7 GHz–6.1 GHz, respectively. While the third pair of antennas accessible at ports P3 and P7 and the fourth pair of antennas accessible at ports P5 and P9 are single-band antennas and operate at 3.85 GHz–4.7 GHz and 8 GHz–11 GHz, respectively. Minimum isolations of 20 dB and 15 dB are attained between every two similar antennas for communication and between the sensing antenna and the antennas meant for communication, respectively. The correctness of the proposed antenna is verified with a fine match between the results obtained from simulations and measurements.

Originality/value

The proposed MIMO antenna possesses salient features, such as polarization diversity and performing a maximum of four communication tasks when all the white spaces are detected.

中文翻译：

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一种用于认知无线电应用的新型二元 MIMO 天线系统

目的

本研究旨在为认知无线电 MIMO 应用提出一种二元多输入多输出 (MIMO) 天线，以避免可重构天线所涉及的复杂性并提高频谱利用效率。

设计/方法/方法

拟议的 MIMO 天线系统包括一个工作在 2 GHz-12 GHz 的宽带天线，用于感知频谱和四对用于通信的天线，它们是单频和双频天线。每对用于通信的天线由两个相似的天线组成。此外，用于通信的天线覆盖了传感天线带宽的 93%。

发现

在端口 P2 和 P6 可访问的第一对天线和在端口 P4 和 P8 可访问的第二对天线是双频天线，工作频率为 3.05 GHz–3.85 GHz、5.8 GHz–8 GHz 和 2.05 GHz–2.55 GHz , 4.7 GHz–6.1 GHz，分别。在端口 P3 和 P7 可访问的第三对天线以及在端口 P5 和 P9 可访问的第四对天线是单频段天线，分别在 3.85 GHz–4.7 GHz 和 8 GHz–11 GHz 下工作。用于通信的每两个类似天线之间以及传感天线和用于通信的天线之间的最小隔离分别为 20 dB 和 15 dB。所提出的天线的正确性通过从模拟和测量获得的结果之间的精确匹配来验证。

原创性/价值

所提出的 MIMO 天线具有显着特征，例如极化分集和在检测到所有空白区域时最多执行四个通信任务。