volume | PIER Journals

Abstract

This present article reports a high isolation four-port Wrench shaped compact UWB MIMO antenna with a novel decoupling network in the ground plane, and its step-by-step evolution is presented for 3.1-10.6 GHz. The proposed four-port MIMO antenna is fabricated on an FR4 substrate of size 44×44 mm² (0.342λ₀ × 0.342λ₀), where λ₀ is a free space wavelength at 2.33 GHz, with 7\,mm edge-to-edge spacing between the radiating elements. It consists of four orthogonal symmetrically placed identical radiating elements each of which has a Wrench-shaped circular patch with a rectangular slot cut in the partial ground. The performance characteristics of this MIMO antenna are reflection coefficients S₁₁ ≤ -10 dB in the range from 2.33 GHz to 11.7 GHz, mutual coupling coefficients S₂₁ ≤ -28.24 dB, and S₃₁ ≤ -22.35 dB. The maximum peak gain is 5.15 dBi at 9.2 GHz, minimum is 1.27 dBi at 3.1 GHz. The maximum peak gain is 5.15\,dBi at 9.2 GHz, and minimum is 1.27 dBi at 3.1 GHz. The maximum efficiency is 98% at 4.66 GHz, and the minimum is 93% at 6 GHz. The diversity parameters of proposed four-port MIMO antenna are reported as ECC ≤ 0.2, DG ≤ 10, TARC ≤ -10 dB, the ratio of MEG between any two elements is near unity, and CCL < 0.38 bits/s/Hz in the band of interest. The design is fabricated and measured. The measured and simulated results are in good agreement and are within the permissible limits.

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Dr. Gayatri Tangirala

Dr. Srinivasu Garikipati

Dr. Durbhakula Manikya Krishna Chaitanya

Dr. Virendra Kumar Sharma