Design of Wideband Fractal MIMO Antenna using Minkowski and Koch Hybrid Curves on Half Octagonal Radiating Patch with High Isolation and Gain for 5G Applications

Abstract

This article represents a Multiple Input Multiple Output (MIMO) hybrid fractal antenna with wider bandwidth. The hybrid fractal MIMO antenna is created by integrating Minkowski and Koch curves on a half octagonal radiating patch. A wider impedance bandwidth 20.4GHz (1.0 to 21.4GHz) and 6.10GHz (23.9 to 30GHz) along with fractional bandwidth of 182.14% and 22.63% has been achieved by using an amalgamated fractal configuration and a tapered microstrip line feed. The proposed antenna retains high isolation between -20 to -50dB in the entire frequency range along with the DG value greater than 9.99 dB and the ECC  less than 0.02. The operating frequency increases from 1.5GHz to 8.5GHz with gain of 8dBi .The gain is almost flat and varies between 4dBi to 7dBi in the frequency range from 8.5GHz to 21.1GHz. Further, in the frequency range from 23.9 to 25.9GHz, the gain rises exponentially to 14dBi Hence, the proposed hybrid fractal MIMO antenna is a proficient candidate for 5G, 3.5GHz band (3.4 – 3.6GHz), 5G NR (New Radio) frequency bands (3.3 – 5.0GHz), LTE band 46 (5.15 – 5.925GHz), EU (European Union) 5G frequency band (5.9 – 6.4GHz), UWB applications (3.1 – 10.6GHz) and 5G 26GHz frequency band.