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Massive MIMO Array Design With High Isolation by Using Decoupling Cavity
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DOI：10.1109/TCSII.2022.3216394.png)
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Abstract
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This brief proposes an isolation enhancement method for massive multiple-input multiple-output arrays using decoupling cavities (DC). The proposed DC is made of a pure Polypropylene (PP) board, and an air cavity is engraved on it. The DC has high transmission in the normal direction and a high insertion loss in the tangential direction of the arrays, respectively. The DC operates with a broadband response due to the low dielectric constant of the substrate. An example of a 4x4 array with an inter-element distance around half wave-length is designed to verify the proposed isolation enhancement method. The triple-layers stacked DC are employed seamlessly above the array. The isolation of the array was enhanced to 24 dB within the bandwidth of 4.21-4.79 GHz. At the same time, the radiation characteristics of the arrays before and after loading the DC basically keep consistent.
Keywords:
Couplings
Massive MIMO
Mutual couplings
Microstrip antenna arrays
Scattering parameters
Microstrip antennas
Insertion loss
Decoupling cavity (DC)
isolation enhancement
massive multiple-input multiple-output (MIMO) antenna arrays
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