Design of a Compact Size Bridge Connected Multiband MIMO Antenna for Automotive 5G and DSRC Communications System

This paper presents a compact six-element dual-band multiple-input and multiple-output (MIMO) antenna system for automotive 5G technology and Dedicated Short Range Communication (DSRC). The MIMO antenna was designed and optimized to cover the dual-frequency bands ( center frequency of 5.85 GHz and 28 GHz). The designed antenna works well at both frequency bands showing a very high -10 dB bandwidth, i.e., 4.1 GHz bandwidth for Band 1 (5.85GHz), and a bandwidth of 3.4 GHz for band 2 (28 GHz). The proposed structure comprises six antenna elements and is designed on Rogers R03003 substrate. The overall electrical size of the whole dual-band MIMO antenna system is 15 mm x 15 mm. The antenna is designed and simulated using HFSS software. The electrical performance results of the proposed design and its MIMO characteristics are discussed and presented in terms of Voltage Standing Wave Ratio (VSWR), radiation patterns, radiation efficiency, gain, Diversity Gain (DG), reflection coefficient (S11). The measured VSWR is better than 3.5:1 at the desired frequencies (28 GHz and 5.9 GHz) across the operating bands. It can be seen that good impedance matching makes this proposed antenna suitable for automotive as well as 5G applications.