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Isolation Improvement of the MIMO PIFA using Metamaterial Absorber Array

In this paper, a high isolated multiple input multiple output (MIMO) configuration planar inverted-F antenna (PIFA) has been presented in favor of mobile handset application. The isolation is enhanced by using an array of the metamaterial absorber which is placed in center of two antenna elements at a centre frequency of 5.65GHz. The proposed antenna geometry consists of swastika shaped design on the FR-4 substrate having dimensions of 7mm × 7mm × 0.8mm at a height of 2.8mm commencing from the ground surface having dimensions 100mm × 50mm × 0.8mm. An array of 4 × 4 unit cell of metamaterial absorber is used to enhance isolation in the midst of antenna elements. Results show that the isolation in the midst of antenna elements has improved from -12dB to -25dB at the resonance frequency 5.65GHz. Further, S-parameters, radiation characteristics, and diversity parameters are analyzed and found suitable for mobile handset.