A novel high isolation quad-port multiband MIMO antenna for V2X applications at Sub-6 GHz band

Abstract A novel effective technique for improving the decoupling among antenna elements in four port MIMO is metamaterial based absorber wall is investigated and presented in this paper. The proposed work includes a quad port MIMO (Multiple Input Multiple Output) antenna for vehicle-to-vehicle (V2V) communication under Sub 6 GHz range. The mutual coupling in MIMO is mitigated by three different techniques: Combline filter, integrated horizontal and vertical absorber walls and patch with meander line technology. The designed antenna has two layer substrates which are coupled by a coaxial feed technique, with dimensions of 75*75*1.6 mm 3 . By using a combline filter in between the ground of nearby circular patches, the mutual connection between them is lessened. Furthermore, the use of integrated horizontal and vertical absorber walls greatly reduces the radiation interference between adjacent antennas. To find out how flexible the antenna is, parametric experiments are conducted. The findings indicate that the peak gain exceeds 6 dB and the return S11 is less than −19 dB. Furthermore, the suggested 2 × 2 MIMO antenna has an observed diversity gain of 6.42 dB, an Envelop Correlation Coefficient of below than 0.002 and a good isolation was observed between antenna units is of −45.92 dB. The proposed antenna best suited applicant for sub-6GHz applications.