Liu, "Fast pencil beam pattern synthesis of large unequally spaced antenna
arrays," IEEE Trans.
SkyCross Dual iMAT technology eliminates interference between closely spaced antennas
. It allows four 4X4 MIMO antennas to compactly fit into a smartphone, tablet, or ultrabook/PC form factor, with the same or better performance provided by widely spaced traditional antennas.
However, controlling the power coupled between the two ports is very challenging in closely spaced antennas
Unlike the arrays in the linear and circular array diagrams, the interelement spacing of the antenna array may change along the array axes, allowing both closely and widely spaced antennas
to be part of the same base station.
The latter offers enhanced target detection and localization capabilities by widely spaced antennas
where an extended target model can be achieved [4,5].
It is well-known that achieving high isolation and low Enveloped Correlation Coefficient (ECC) between closely spaced antennas
is important in portable MIMO-embedded devices where antennas must be designed within a small volume .