一种用于认知通信的具有带阻滤波器解耦网络的频率可重构 MIMO 天线。

A Frequency Reconfigurable MIMO Antenna with Bandstop Filter Decoupling Network for Cognitive Communication.

机构信息

Department of Electronics and Communication Engineering, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Gangtok 737136, India.

Department of Information Technology, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Gangtok 737136, India.

出版信息

Sensors (Basel). 2022 Sep 14;22(18):6937. doi: 10.3390/s22186937.

DOI:10.3390/s22186937

PMID:36146286

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9501463/

Abstract

A compact reconfigurable MIMO antenna was developed for cognitive radio applications in this research work. A bandstop filter-based decoupling network was employed in this MIMO antenna to keep mutual coupling at a minimum. A single PIN diode was connected in the filter configuration for the purpose of reconfiguration. Controlling the ON/OFF conditions of the PIN diode, it became possible to achieve a MIMO operating frequency of 4.75 GHz in mode 1 and 1.77 GHz in mode 2, respectively. At 4.75 GHz, isolation was 42.68 dB, while at 1.77 GHz, isolation was 26.52 dB. The proposed reconfigurable MIMO antenna achieved a peak gain and radiation efficiency of 6.63 dBi and 92.04 percent in mode 1 and 4.41 dBi and 89.64 percent in mode 2. MIMO characteristics such as an envelope correlation coefficient (ECC) less than 0.253, diversity gain (DG) greater than 9.675 dB, a mean effective gain (MEG) measurement ratio of less than 0.00388 dB, and channel capacity loss (CCL) of less than 0.06528 bits/s/Hz were measured for both operational frequency bands. To make it simple to integrate into small wireless devices, the overall size of the antenna is limited to 48 mm×24 mm 0.28 λ0×0.12 λ0.

摘要

本研究工作开发了一种用于认知无线电应用的紧凑型可重构多输入多输出（MIMO）天线。该 MIMO 天线采用基于带阻滤波器的去耦网络，将互耦保持在最低水平。在滤波器结构中连接了一个单 PIN 二极管，用于实现重构。通过控制 PIN 二极管的 ON/OFF 状态，可以分别在模式 1 下实现 4.75 GHz 的 MIMO 工作频率，在模式 2 下实现 1.77 GHz 的 MIMO 工作频率。在 4.75 GHz 时，隔离度为 42.68 dB，而在 1.77 GHz 时，隔离度为 26.52 dB。所提出的可重构 MIMO 天线在模式 1 下达到了 6.63 dBi 的峰值增益和 92.04%的辐射效率，在模式 2 下达到了 4.41 dBi 和 89.64%的辐射效率。在两种工作频段下，测量了 MIMO 特性，如包络相关系数（ECC）小于 0.253、分集增益（DG）大于 9.675 dB、平均有效增益（MEG）测量比小于 0.00388 dB 和信道容量损耗（CCL）小于 0.06528 位/s/Hz。为了便于集成到小型无线设备中，天线的整体尺寸限制在 48mm×24mm 0.28 λ0×0.12 λ0。