PLoS ONE (Jan 2023)

Two closely spaced microstrip patches with high isolation for full-duplex/MIMO applications.

  • Huy-Hung Tran,
  • Tung The-Lam Nguyen,
  • Thuy Nguyen Thi

DOI
https://doi.org/10.1371/journal.pone.0290980
Journal volume & issue
Vol. 18, no. 10
p. e0290980

Abstract

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This paper shows an effective method to significantly enhance the isolation of a closely spaced two-port patch antenna, which can be deployed for full-duplex transceivers as well as multiple-input-multiple-output (MIMO) systems. Two rectangular microstrip patches are arranged in the E-plane configuration. To achieve high isolation, a grounded stub is positioned between the radiating patches. For validation of the proposed concept, an antenna prototype is fabricated for measurements. The measured data demonstrates that the port-to-port mutual coupling can be suppressed to -50 dB, which is useful in self-interference cancellation for full-duplex communication systems. Compared with the coupled design, the isolation is significantly enhanced by 43 dB with an inter-element spacing of 0.034λc, where λc is a free-space wavelength at the center operating frequency. Regarding MIMO metrics, the antenna also shows good MIMO diversity performance based on an envelope correlation coefficient and a diversity gain.