volume | PIER Journals

Abstract

This paper proposes a novel four-port MIMO antenna specifically designed for millimeter-wave (mm-wave) 5G applications. The antenna features a compact symmetric layout measuring 22 mm × 22 mm, corresponding to approximately 2.7λ × 2.7λ at 37 GHz. The prototype is fabricated on a Rogers RT Duroid 5880 substrate (ε_r = 2.2, tanδ = 0.0009, h = 0.8 mm) to ensure low loss and stable performance at high frequencies. The antenna operates effectively over two targeted frequency bands, 37-41 GHz and 42-43.5 GHz, making it suitable for high-data-rate, short-range communication systems in emerging 5G networks. The structure is evolved through multiple design stages using strategically placed curved parasitic elements to achieve dual-band operation, high isolation, and enhanced gain. Experimental validation using a vector network analyzer and anechoic chamber confirms good agreement between simulated and measured S-parameters, with isolation better than -20 dB. The antenna demonstrates a measured gain between 9.3 and 9.7 dBi, with simulated peaks up to 11 dBi. Far-field pattern measurements exhibit stable bidirectional radiation with low cross-polarization and well-defined main lobes at both 38 GHz and 42 GHz. MIMO performance metrics such as ECC < 0.01, DG ≈ 10 dB, MEG ≈ -3 dB, and CCL < 0.4 bps/Hz confirm efficient multi-port operation. The proposed antenna thus offers a compact, high-isolation, high-gain solution for next-generation mm-wave 5G MIMO systems.

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Mr. Manish Kumar Dabhade

Dr. Krishna Keshavrao Warhade