Neutralization Line Decoupling Tri-Band Multiple-Input Multiple-Output Antenna Design

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 λ 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. INDEX TERMS Multiple-input-multiple-output, tri-band, high isolation, neutralization line.

Fifth Generation Antennas: A Comprehensive Review of Design and Performance Enhancement Techniques

“…[15], [55]- [57] Neutralization Lines It is a compact antenna. It gives wider bandwidth and enhanced efficiency.…”

Compact Four-Band Cactus-Shaped Antenna for 5g and Wlan Applications

“…With the continued development of communication technology, low-profile multi-band antennas of easy fabrication are required to cover various applications, such as 5G and WLAN. In order to constantly improve the performance of multi-band antennas, much progress has been made [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Various structures based on patch antenna are reported in [1][2][3][4][5][6][7] due to easy integration of antenna to the printed circuit board (PCB).…”

“…Specifically, multi-band antennas are investigated in [10][11][12] to meet the needs of laptop computers. Also, multi-band compact multipleinput multiple-output (MIMO) antennas are proposed for 5G in [13][14][15][16][17][18]. For example, in [15,16], these antennas adopt multi-curved structures to the radiation patch for overall miniaturization.…”

“…Also, multi-band compact multipleinput multiple-output (MIMO) antennas are proposed for 5G in [13][14][15][16][17][18]. For example, in [15,16], these antennas adopt multi-curved structures to the radiation patch for overall miniaturization. In the previous antenna research, cactus shape is also often applied.…”

A Low-Profile Decoupling Slot-Strip Array for 2 × 2 Microstrip Antenna

“…Numerous ways have been proposed to decrease the mutual coupling between antennas, such as electromagnetic bandgap (EBG) structure [4][5][6], defected ground structure (DGS) [7][8][9][10][11], polarization-conversion isolator [12], resonator [13], neutralization line [14][15][16], coupled resonator decoupling network [17], interference cancellation chip [18] and metamaterial [19][20][21]. However, these decoupling approaches are limited to two-element coupled antennas or one-dimensional antenna array.…”