2×2 Circularly Polarized MIMO Antenna at Ka-band for Fifth Generation Applications
In this paper, two ports Circularly Polarized (CP) multiple-input multiple-output (MIMO) Square Microstrip Patch Antenna (SMPA) at Ka-band is developed. The proposed antenna is designed in order to resonate at 28 GHz (Ka-band) which is suitable for fifth generation (5G) applications. CP is realized by introducing two corners truncation with V-shaped slot of the square patch. The presence of the V-slot has improved the impedance bandwidth of the proposed antenna. The analysis and the optimization processes throughout this paper are carried out using Finite Element Method (FEM) and Finite Integration Technique (FIT). Single element and two elements corporate fed array are fabricated and their scattering matrices have been measured. A good agreement between simulated and measured data is obtained. An equivalent circuit model for the proposed two port MIMO array with circuit element values is introduced. The total efficiency of the proposed MIMO antenna is higher than 85% along the entire bandwidth. The proposed design covers 26.55 – 29.2 GHz (9.4%) frequency band with more than 34 dB isolation between the two ports along that frequency band. Hence, the proposed antenna performance makes it a good candidate for the 5G applications at millimeter wave frequency.
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