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A compact four-port UWB MIMO antenna with connected ground and wide axial ratio bandwidth

  • Sachin Kumar (a1), Gwan Hui Lee (a1), Dong Hwi Kim (a1), Wahab Mohyuddin (a1), Hyun Chul Choi (a1) and Kang Wook Kim (a1)...

Abstract

A new design method of an ultra-wideband circularly-polarized planar multiple-input-multiple-output (MIMO) antenna is presented in this paper. The proposed MIMO antenna consists of four unit cell antennas, being comprised of a microstrip feed line and a square slotted ground plane. In the proposed unit cell design, a circular stub is protruded from the ground plane strip for achieving circular polarization. The unit cell of the MIMO antenna is optimized by adjusting design parameters. The compact four-port MIMO antenna prototype is designed on the FR4 substrate with the overall dimensions of 45 × 45 × 1.6 mm3. The proposed four-port MIMO antenna design provides an impedance bandwidth (S11 < −10 dB) of 112% (3.1–11 GHz) and a 3 dB axial ratio bandwidth of 36% (4.8–6.9 GHz). The performance of the fabricated MIMO antenna shows good agreement between the EM simulation and measurement results.

Copyright

Corresponding author

Author for correspondence: Kang Wook Kim, E-mail: kang_kim@ee.knu.ac.kr

References

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