Multi-directional Wideband Unit-element MIMO Antenna for FR-2 Band 5G Array Applications
Tóm tắt
In this paper, a multi-directional wideband self-isolating multiple-input-multiple-output (MIMO) microstrip antenna is proposed for fifth-generation (5G) frequency range-2 (FR-2), 28 GHz band application. The three directional radiation beam and wideband response of the proposed antenna is obtained by integrating complementary-split-ring-resonators (CSRRs) metamaterial to the ground plane. Integration of these elements are transforming the back lobe into two additional functioning main lobes. Also, the CSRRs are modifying the overall material characteristics and the surface current distributions resulting in the wideband impedance matching. The radiator of the antenna is a balanced microstrip line fed by a coplanar microstrip feed. The impedance matching between 50
$$\Omega $$
microstrip feed and the radiator is adjusted through a balanced rectangular balun. The measured fractional bandwidth of the antenna is 18.57% at the centre frequency of 28 GHz and realized gain better than 7 dBi in the entire operating band. The MIMO configuration exhibiting isolation better than -17 dB, an envelope correlation coefficient (ECC) less than 0.026 and the diversity gain above 9.9 dB confirms its suitability for 5G applications.
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