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This paper presents a comparative study of two compact MIMO antennas in the 5.8 GHz ISM band which use stub and via techniques to increase isolation. The first design involves a Roger RT/Duroid 5880 substrate with a low dielectric constant (εr = 2.2) that is able to deliver −47.61 dB isolation over a bandwidth of 70 MHz (5.75–5.82 GHz). It has an excellent performance with TARC of – 65.49 dB, and ECC less than 0.005, diversity gain more than 9.99 dB, and an antenna efficiency of 94.78%. The axial ratio bandwidth for this has been 30 MHz (5.78–5.81 GHz) and a peak gain level of 5.81 dB, which supports the circular polarization. The second design, fringed from a cost efficient FR4 substrate (εr = 4.4) shows even better isolation of −52.89 dB in a wider bandwidth of 230 MHz (5.69–5.92 GHz). While it also reduces a similar low ECC and high diversity gain, it reduces the efficiency and gain at 34.94% and 0.27 dB respectively. Each of the two antennas has high polarization purity and low correlation characteristics, rendering both antennas appropriate for MIMO applications with high level of isolation and small size.

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Performance Comparison of Stub-Via Based Circularly Polarized MIMO Antennas on Low and High Dielectric Substrates

  • 会议论文

  • 发表日期：

    2026年

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  • Shahadev Hake,
  • Rupesh Jaiswal,
  • Sunil Moon,
  • Pritam Nikam

摘要

This paper presents a comparative study of two compact MIMO antennas in the 5.8 GHz ISM band which use stub and via techniques to increase isolation. The first design involves a Roger RT/Duroid 5880 substrate with a low dielectric constant (εr = 2.2) that is able to deliver −47.61 dB isolation over a bandwidth of 70 MHz (5.75–5.82 GHz). It has an excellent performance with TARC of – 65.49 dB, and ECC less than 0.005, diversity gain more than 9.99 dB, and an antenna efficiency of 94.78%. The axial ratio bandwidth for this has been 30 MHz (5.78–5.81 GHz) and a peak gain level of 5.81 dB, which supports the circular polarization. The second design, fringed from a cost efficient FR4 substrate (εr = 4.4) shows even better isolation of −52.89 dB in a wider bandwidth of 230 MHz (5.69–5.92 GHz). While it also reduces a similar low ECC and high diversity gain, it reduces the efficiency and gain at 34.94% and 0.27 dB respectively. Each of the two antennas has high polarization purity and low correlation characteristics, rendering both antennas appropriate for MIMO applications with high level of isolation and small size.