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This brief presents a compact multiband multiple input multiple output (MIMO) antenna, where two robot-character-shaped patches are closely positioned on the top of the substrate for circular polarization. The dimensions of the proposed MIMO antenna are 0. 34 0. 13 0. 01 at 4 GHz and the distance between two symmetrical elements is 0. 05 mm. The robot-character-shaped patch generates four different frequency bands of 3. 85-4. 25 GHz, 4. 95-5. 1 GHz, 6. 94-7. 35 GHz, and 8-8. 3 GHz. The simulation and measurement results show that the designed antenna has better S-parameters |S₁₁| - 10 dB, and an isolation of |S₁₂| - 25 dB resulting from the irregular parasitic element to reduce mutual coupling, an axial ratio (AR) of no more than 3 dB, radiation pattern, total gain, and efficiency over all operating bands when compared to the existing two-port MIMO antennas. MIMO antennas diversity characteristics are also calculated to evaluate the proposed antennas performance. The proposed antenna is a good contender for 5G pioneer band, 5 GHz WLAN band, and satellite communication applications concomitantly.
Khan et al. (Thu,) studied this question.