Abstract
A pair of tri-band multiple-input-multiple-output (MIMO) antennas with high isolation is investigated in this paper. The proposed antenna consists of two monopole antenna elements with an edge to edge spacing of 4 mm ( $0.03~\lambda _{0}$ at 2.3 GHz). The monopole antenna element chose the bending line structure that can operate in tri-band and realize miniaturization. To achieve compact dimension and high isolation, symmetrical distribution layout is adopted to decouple the low frequency band, the U-shaped neutralization line (NL) contacting with two microstrip lines, and it can to improve the isolation in high frequency band, and the inverted U-shaped NL contacting with two radiation patch can decoupling in the middle frequency band. And then study the envelope correlation coefficient is lower, and the radiation pattern in operation bands is quasi-omnidirectional. It indicates that the antenna has obtained a satisfactory diversity performance within the whole operation bands which can be a good candidate for some portable MIMO applications.
Highlights
Multiple-input-multiple-output (MIMO) antennas have constantly captured wildly attention in the advances of the wireless communication, due to its outstanding advantages such as increased system capacity, diversity gain (DG), decrease envelope correlation coefficient (ECC) and so on
When the antenna elements are placed at closed space, mutual coupling deteriorates the performance of the MIMO system [1], [2]
In this paper, a miniaturization and compact MIMO antenna is made up two tri-band monopole antennas with the multibranch structure
Summary
Multiple-input-multiple-output (MIMO) antennas have constantly captured wildly attention in the advances of the wireless communication, due to its outstanding advantages such as increased system capacity, diversity gain (DG), decrease envelope correlation coefficient (ECC) and so on. Defected ground structure can effectively improve the isolation of the multi-band MIMO antenna [8]–[12]. In order to realize the miniaturization and compactness, adding neutralization line (NL) on the MIMO antenna radiation elements is effective [13]. This structure has not affected the origin element structure, and can realize miniaturization. It can take into account both the decoupling of the lower and high frequency band. This paper, the antenna elements adopts the multi-branch winding structure to miniaturization, and the structure of NLs is simple and it can achieve good decoupling performance.
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