Mutual Reduction in the Coupling of the MIMO Antenna Network Applied to the Broadband Transmission

Abstract

In this article, a new form of UWB (ultra-wide-band) antenna operating to the desired specifications, obtained from a base antenna to which some modifications are made. The proximity of the antennas causes a mutual coupling phenomenon thus generating an apparent modification of their characteristics. It is therefore crucial to have the minimum level of insulation with a small possible separation distance between the antennas to ensure efficient operation of our multiple input and multiple output (MIMO) system. The separation spacing between the antennas is close to 0.15λ0 (λ0 is the wavelength in free space), where the coupling can be very weak. To overcome this weakness, two efficient methods are applied to minimize mutual coupling in a four-element MIMO antenna, such as the use of the neutralization line and the use of split ring resonator metamaterial (SRR). The objective of our paper is, on the one hand the design of UWB antenna, and on the other hand to minimize the coupling between four UWB-MIMO antennas using the two methods of isolation mentioned above. A coupling minimization of more than 15 dB is obtained using the neutralization line and more than 20 dB with the use of metamaterial while maintaining the operating band and radiation specifications of the MIMO antennas.

Isolation enhancement of metamaterial structure MIMO antenna for WiMAX/WLAN/ITU band applications

“…The electromagnetic coupling between the proposed antennas is effectively suppressed by the double-band μ -negative metamaterial (MNG). In [20] mutual coupling reduction reduced using the neutralization and metamaterial unit-cell 20 dB isolation is improved. In [21] a review is presented on 5 G multi-element/port antenna design for wireless applications.…”

A four-element UWB MIMO antenna using SRRs for application in satellite communications

“…When designing antennas, several parameters must be taken into account (radiation efficiency…) [3][4][5] that have a huge influence on signal characteristics and transmission or reception quality. The prodigious development of such a printed structure is linked to the considerable progress made in the 1980s in the field of miniaturization, in the integration of electronic circuits and especially low-loss dielectric substrates [6,7].…”