CSRR loaded high gained 28/38GHz printed MIMO patch antenna array for 5G millimeter wave wireless devices

In this research paper, a new highly efficient compact size, dual-band 28/38GHz, 2 × 2 printed circuit board (PCB) based multi-input multi-output (MIMO) antenna array loaded with complementary Split Ring Resonator (CSRR) structure is simulated and fabricated for fifth-generation (5G) millimeter wave-based wireless devices. The Rogers RT/Duroid 6002 material within heigh 1.52 mm is being used as the substrate for the MIMO antenna array design. The CSRR metamaterial unit cells are positioned on the top and ground surface to improve the antenna's outcomes in terms of gain and directivity. The highly efficient CST microwave studio 2020 is used to design the MIMO antenna. It is noted from the results that the proposed single patch antenna is resonating on 28.06 GHz and 38.04 GHz with effective 15.81% and 14.58% impedance bandwidth at respective resonating bands. Then finally, the 2 × 2 MIMO antenna array having size (30 × 30 × 1.52) mm3 is developed from the proposed optimized antenna. The presented MIMO antenna array is tested by using the vector network analyzer (VNA). The measured results are compared with the simulated one and found that the optimized proposed MIMO antenna array is resonating at 28.29 GHz and 38.78 GHz with an effective reflection coefficient of −20.54 dB and − 35.81 dB respectively. It has a bandwidth of 15.30% and 13.97% and isolation of −24 dB and − 38.71 dB within respective resonating bands. It has achieved a realized gain of 8.65dBi and 8.24 dBi at 28 GHz and 38 GHz respectively. The ECC is <0.0041 between the MIMO antenna element. The developed MIMO antenna can be a good candidate for 5G millimeter wave-based wireless portable devices