Abstract
AbstractA miniaturized broadband planar monopole multiple‐input‐multiple‐output (MIMO) antenna is proposed for the 3.5 GHz frequency band of the Long‐Term Evolution Advanced application. Two novel broadband metamaterial split‐ring resonator units are used to reduce the mutual coupling of the MIMO antenna, also expanding the antenna impedance bandwidth. The size of the whole antenna is 47.5 mm × 40 mm × 1.6 mm (1.15λg × 0.97λg × 0.039λg) and the center distance between the two antenna elements is only 0.25λ0. The measured results agree well with the simulated ones. The measured 10‐dB impedance bandwidth is 3.35 to 3.78 GHz (12.3%), and the isolation is up to 15 dB within the bandwidth.
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