Design Broadband MIMO Antenna to meet 5G communication systems requirements

This paper presents a design of an broadband (MIMO ( multiple inputs multiple outputs antenna with a partial ground plane and rectangular patch, working in 5G mm-wave band, antenna covers broadband from 28GHz to more than 60GHz. With small size, low-cost substrate, and low-profile patch. The antenna made of Rogers RT5880 substrate with a dielectric constant of 2.2, and loss tangent of 0.0009, a standard thickness of 1.575mm, and copper patch and ground with thickness 0.035mm. The partial ground technique is employed to achieve an ultra-wideband. For single element antenna, the Substrate dimensions are 24mm×10mm and patch with dimensions 4mm×2.98mm with Inset-fed technique is used. The proposed antenna resonates at all frequencies between 28 GHz and 60 GHz, with a return loss (S11 ≤ -10 dB) for all frequencies. The proposed design provides the high Gain, and good radiation efficiency over the whole operating band. For MIMO antenna, the proposed design consists of 4-elements with a 4-wave ports to provides the most optimum results and fulfill 5G systems requirements, to achieving gain up to 20dB, and other MIMO antenna parameters like Diversity Gain, and Envelope Correlation Coefficient. The overall size of the 4-elements MIMO antenna is 96 x 10 x 1.575 mm³. It is also achieving a mutual coupling of less than -20dB in most covered band without utilizing any coupling techniques, defective ground structure (DGS), or slots. The proposed Antenna is designed and simulated by Ansoft HFSS and CST Microwave Studio, the results showed good agreement for both software.