A Compact Four-Port MIMO Antenna for UWB Applications.

Area of Science:

• Electromagnetics and Antenna Design
• Wireless Communication Systems

Background:

• Multiple-Input Multiple-Output (MIMO) antennas are crucial for enhancing wireless communication capacity.
• Ultrawideband (UWB) technology requires antennas with extensive bandwidth and compact size.

Purpose of the Study:

• To design and present a compact four-port MIMO antenna for UWB applications.
• To achieve high isolation and wide impedance bandwidth within a small physical footprint.

Main Methods:

• Utilized polarization diversity as the primary decoupling technique.
• Incorporated protruded ground and parasitic elements to enhance isolation.
• Designed a unique ground structure with defective ground and branches connected via a “卍” shape.

Main Results:

• Achieved an ultrawideband impedance bandwidth from 3.1 GHz to 13.1 GHz (123%).
• Demonstrated high isolation between antenna ports, with values less than -17 dB.
• The antenna occupies a compact area of 45 mm × 45 mm on a single FR4 substrate.

Conclusions:

• The proposed compact four-port MIMO antenna is a viable solution for UWB applications due to its wide bandwidth and high isolation.
• The antenna's small size and performance characteristics make it suitable for integration into various wireless devices.
• The design innovations, including polarization diversity and unique ground structure, contribute to its effectiveness.