Vivaldi MIMO Antenna Using Oval Shape Structure tor for 24GHz-34GHz Millimeter-Wave Communication Frequency Band

The increasing proliferation of advanced devices for wide-band, 5G communication, micrometer wave, and millimeter wave communication necessitates an antenna that can handle massive data rates, provides high gain, and has a stable radiation pattern. Most researchers are interested in the Vivaldi antenna because of its high gain, wide bandwidth, low radiation loss, and radiation pattern stability. Recently, the evolution and demand for millimeter wave devices and antennas are increasing for their use in different applications and future millimeter wave communication. This article presents a compact, planer, efficient
$\mathbf{2}\times \mathbf{1}$
Vivaldi MIMO antenna for 24GHz-34GHz frequency band millimeter wave communication. This paper mainly focuses on the small size of the antenna which is
$\mathbf{31}\times \mathbf{20}\mathbf{mm}\mathbf{2}$
and isolation is 50dB. The top side is made up of an Asymmetric flared shape patch with an oval shape structure, while the back side is made up of partial ground with flare shaped structure to achieve minimum mutual coupling and compact size. For high bandwidth and isolation, the Vivaldi structure is used on a low-cost FR4 dielectric substrate with a loss tangent of 0.02. The simulated envelope correlation coefficient is 0.001 which is very low according to the standard value of the International Telecommunication Union (ITU). The simulated response for the proposed antenna is reported in terms of gain, efficiency, surface current distribution, VSWR, return loss and directivity and it shows the good performance characteristics of the MIMO antenna. Both the simulated and measured results are presented and it shows good agreement between them.