Design of an Eight-Element Double-Loop MIMO Antenna With Inverted-L Isolators

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Abstract
For the first time, an eight-element MIMO antenna is designed by integrating four double-loop resonators with two pairs of inverted-L isolators. By superimposing the resonance modes of the double-loop antenna, the anti-phase currents of the loops can effectively be canceled out for achieving high isolation (S12), without requiring additional decoupling elements or lumped components. The isolators have successfully generated a null point near the operating frequency for further enhancing the isolation (S32) between the double-loop antennas. As a result, the proposed antenna can achieve good isolation levels of S12 <−21.3 dB and S32 <−29.5 dB across a 10-dB bandwidth in the N78 band (3.3−3.8 GHz) and each port provides over 78% of total efficiency and ECC below 0.01 in experiments.
Funding Information
  • Ministry of Higher Education Malaysia and Universiti Teknologi Malaysia (4J611, 24H05, 04M57, 4B888)

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