volume | PIER Journals

Abstract

A compact four-element MIMO antenna with dimensions 40 × 32 × 1.2 mm³ is presented. The design employs stylized C-shaped radiators with slanted edges and a shared defected ground plane integrated with folded stubs to enhance impedance matching and bandwidth. Fabricated on an RT5880 substrate (ε_r = 2.2, tanδ = 0.0009), the antenna achieves an ultra-wide operating range of 4.24-19.70 GHz with inter-element isolation above 20 dB. Diversity metrics, including envelope correlation coefficient (< 0.02), diversity gain (≈10 dB), channel capacity loss (<0.0325 bits/s/Hz), and total active reflection coefficient (-12 to -24 dB), are verified through simulation and measurement, confirming robust MIMO characteristics. Owing to its wideband operation and high isolation, the antenna is suitable for sub-6 GHz 5G NR (n79: 4.4-5.0 GHz), WLAN/Wi-Fi (5.15-5.825 GHz), X-band navigation and radar (8-12 GHz), and Ku-band satellite communication (12-14.5 GHz).

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Dr. Pandillapalli Janardhana Reddy

Prof. Gummadi Kameswari