Isolation Enhancement between Ports of a Compact Ultra-wideband MIMO Antenna

Abstract

In this paper, a novel compact multiple-input multiple-output (MIMO) antenna with enhanced port isolation is proposed for ultra-wideband (UWB) applications. The UWB MIMO antenna contains two coplanar annular monopoles etched on the front side of the FR-4 substrate. The dielectric substrate has a relative permittivity of 4.4 and a size of 80 mm × 40 mm × 1.6 mm. The irregular ground is printed on the back side of the substrate. In order to enhance the port isolation between the two monopoles, the expanded ground is exploited in the proposed design. In addition, the ground is etched with some slots to achieve good impedance matching. Both the simulated and measured results show that the proposed antenna achieves good impedance matching as well as high port isolation over the entire UWB band. Moreover, the proposed antenna has good spatial diversity characteristics. In summary, the proposed UWB MIMO antenna can be well applied to the ultra-wideband wireless communication system.

Design of a Novel Circularly Polarized MIMO Antenna with Enhanced Isolation for Ultra-wideband Communication

“…Some papers combine ultra-wideband technology with MIMO technology to obtain a more high-speed and stable communication transmission process. [19][20][21][22][23][24][25][26][27][28] show relevant research progress but most of them are linearly polarized (LP). Some papers combine ultra-wideband technology with MIMO technology to obtain more highspeed and stable communication transmission but most of them are linearly polarized (LP) [19][20][21][22][23].…”

“…[19][20][21][22][23][24][25][26][27][28] show relevant research progress but most of them are linearly polarized (LP). Some papers combine ultra-wideband technology with MIMO technology to obtain more highspeed and stable communication transmission but most of them are linearly polarized (LP) [19][20][21][22][23]. [19] utilized stub and Y-type defective ground structure to achieve linearly polarized UWB MIMO antenna.…”

“…[20,21] placed the antenna units orthogonally to enhance isolation to realize MIMO. [22,23] introduced fence-type structure and utilized extended T-shaped stub separately to achieve compact MIMO UWB antenna. Currently, several recent papers are beginning to investigate how to achieve partial circular polarization in wideband or UWB band [24][25][26][27][28].…”