Abstract
This work presents the concept and design of an antenna element, aimed at 5G time division duplex (TDD)-based digital massive MIMO applications, operating in millimeter waves (mm-waves). The proposed radiating structure is based on printed slot antennas, fed by a substrate integrated coaxial line (SICL) for significantly reducing mutual coupling among the array elements. Furthermore, the slot has its own cavity for creating a broadside-direction beam, without increasing mutual coupling. Numerical results demonstrate 1.31 GHz bandwidth at 26 GHz, 6.4 dBi gain and beamwidth of 70° and 80° in the main orthogonal planes. A two-element array is reported as a proof-of-concept and the mutual coupling between its elements has been kept lower than 32 dB from 25 to 27 GHz, illustrating its potential for scalability to high-order massive antenna TDD arrays.
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