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Related Experiment Video

Updated: Nov 7, 2025

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CPW Fed Compact UWB 4-Element MIMO Antenna with High Isolation.

Wenfei Yin1, Shaoxiang Chen1, Junjie Chang1

  • 1School of Computer Science and Information Engineering, Hefei University of Technology, Hefei 230009, China.

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|April 30, 2021
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Summary

A compact multiple-input-multiple-output (MIMO) antenna for ultrawideband (UWB) applications was developed. This antenna achieves excellent polarization diversity and isolation, making it ideal for portable wireless devices.

Keywords:
MIMO antennaUWBcoplanar waveguide (CPW)high isolationstub

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Antenna Theory

Background:

  • Portable wireless devices require compact antennas with ultrawideband (UWB) capabilities.
  • Achieving polarization diversity and high isolation in multi-element antennas is challenging.

Purpose of the Study:

  • To propose an extremely compact multiple-input-multiple-output (MIMO) antenna for portable wireless ultrawideband (UWB) applications.
  • To enhance polarization diversity and suppress mutual coupling in a four-element monopole antenna array.

Main Methods:

  • Designed a prototype with four perpendicularly placed monopole antenna elements.
  • Implemented a gap between the radiation element and ground plane to reduce mutual coupling.
  • Incorporated a matching stub for impedance matching across a wide frequency range.

Main Results:

  • Achieved a wide bandwidth of 3-20 GHz.
  • Demonstrated high isolation between antenna elements, exceeding 17 dB.
  • Confirmed excellent radiation characteristics, stable gain, and a low envelope correlation coefficient (ECC) below 0.1.

Conclusions:

  • The proposed compact MIMO antenna effectively meets the requirements for portable UWB applications.
  • The design successfully achieves polarization diversity with high isolation and stable performance.
  • The antenna's characteristics are well-suited for advanced wireless communication systems.