volume | PIER Journals

Abstract

Compact multi-port antennas are essential for future 5G millimetre-wave systems because they support high-speed communication, stable signal quality, and multiple data channels within limited device space. This study presents a compact, planar, six-port MIMO antenna for 38-40 GHz 5G millimetre-wave applications. The antenna is designed on a low-loss Rogers RT5880 substrate with an overall size of 40 × 40 × 0.543 mm³. The design follows an S-parameter-guided approach, beginning with a single radiating element and extending to the final six-port MIMO configuration. The proposed structure maintains a simple planar geometry without using decoupling networks, electromagnetic bandgap cells, frequency-selective surfaces, metasurfaces, dielectric lenses, or external reflectors. Simulated and measured results show good impedance matching across 38-40 GHz, with reflection coefficients below -10 dB and resonance near 39.3-39.5 GHz. Inter-port isolation is mostly better than 20 dB, while the measured gain reaches approximately 8.28 dBi near resonance. The antenna also achieves an extremely low ECC of 5 × 10^-4, a diversity gain close to 10 dB, an acceptable TARC, and a balanced MEG. Such results validate its applicability to compact 5G user equipment, small-cell systems, and high-density wireless platforms.

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Ms. Malini Soman

Dr. Pardeep Kumar

Dr. Manish Sharma

Dr. Seema

Dr. Kishore Ajay Kumar Ayyala