Abstract
ABSTRACT This paper presents the analysis of a collinear MIMO (multiple input and multiple output) antenna and its conformal models for 5G and millimetre wave communications. The proposed MIMO antenna contains two collinear elements, integrated with balun structure and defected ground structure). The proposed antenna is of compact size with dimensions 22 × 13 × 0.254 mm3. It operates for an impedance bandwidth (S 11 < −10 dB) of 17.5 and 2.4 GHz. A peak gain of 6.72 dB is achieved and the maximum efficiency obtained is 98.7%. Maximum isolation between the two elements of the proposed MIMO antenna is about 89.5 dB in the operating band. To validate the proposed MIMO antenna, a prototype is fabricated and tested. The simulated and measured results: impedance bandwidth, radiation pattern, gain, isolation between the two elements, diversity gain and envelope correlation coefficient are in good agreement.
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