Abstract
This paper proposes a novel compact multiple-input-multiple-output (MIMO) antenna, which has miniaturized radiators and improved isolation, working for the long-term evolution (LTE) mobile communication. Each of the proposed radiators has a double-layered ring of the composite right- and left-handed transmission-line configuration, which has the footprint of λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> /30 by λ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">g</sub> /30, much smaller than the conventional MIMO antenna radiators. These radiators can be placed close to each other and have a planar modified mushroom structure between them for a higher isolation level. The design starts from the equivalent circuit for the LTE 1.7-GHz-band antenna, finds a physical structure suitable for the circuit, and is verified by comparing the circuit simulation with the 3-D EM simulation and measured data. The dispersion diagram shows that the zeroth-order resonance coincides with the center frequency of the band, and the fabricated antenna has the return loss less than -10 dB, the isolation over 12 dB, and the radiation efficiency over 50%.
Published Version
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