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

Hashinur Islam¹, Saumya Das², Tanweer Ali³

¹Department of Electronics and Communication Engineering, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Gangtok 737136, India.

Sensors (Basel, Switzerland)

|September 23, 2022

Summary

This study presents a compact reconfigurable multi-input multi-output (MIMO) antenna for cognitive radio. The antenna achieves dual-band operation with high isolation and efficiency, suitable for small wireless devices.

Keywords:

bandstop filter-based decoupling network cognitive communication system reconfigurable MIMO antenna

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Area of Science:

Electrical Engineering
Antenna Theory
Wireless Communications

Background:

Cognitive radio systems require adaptable antennas for dynamic spectrum access.
Minimizing mutual coupling is crucial for efficient MIMO antenna performance.
Reconfigurable antennas offer multi-band capabilities within a compact form factor.

Purpose of the Study:

To develop a compact reconfigurable multi-input multi-output (MIMO) antenna for cognitive radio applications.
To achieve dual-band operation with high isolation and efficiency.
To ensure suitability for integration into small wireless devices.

Main Methods:

A bandstop filter-based decoupling network was utilized to minimize mutual coupling.
A single PIN diode was integrated for antenna reconfiguration.
The antenna's performance was evaluated in two distinct operating modes.

Main Results:

The reconfigurable MIMO antenna operated at 4.75 GHz (mode 1) and 1.77 GHz (mode 2).
High isolation levels of 42.68 dB and 26.52 dB were achieved at the respective frequencies.
Excellent MIMO characteristics, including low envelope correlation coefficient (ECC) and high diversity gain (DG), were demonstrated.

Conclusions:

The proposed compact reconfigurable MIMO antenna is well-suited for cognitive radio applications.
The antenna design offers efficient dual-band operation with minimal mutual coupling.
Its small size and performance metrics make it ideal for integration into compact wireless devices.