volume | PIER Journals

Abstract

This paper proposes a four-port ultra-wideband (UWB) MIMO antenna with high isolation and three notch bands. A cross-shaped decoupling structure (CSDS) is synergistically integrated with an improved L-shaped ground plane to achieve high port isolation. Composite resonant slots (CRSs) are introduced on the radiating patch, and two L-shaped slots are etched on the feed line to suppress interferences from WiMAX (3.19 GHz), C-band (4.45 GHz), and X-band (7.95 GHz). Simulation and measurement results verify that the Voltage Standing Wave Ratio (VSWR) at the center frequencies of the notched bands is greater than 6.8, 8.1, and 4.3, respectively. In the operating frequency band of 2.7-12 GHz (excluding the notched bands), the isolation is > 24.3 dB, envelope correlation coefficient (ECC) < 0.0045, diversity gain (DG) > 9.9990 dB, total active reflection coefficient (TARC) < -10 dB, and channel capacity loss (CCL) < 0.4 bps/Hz. It fully meets the requirements of high-performance MIMO systems for channel independence and transmission efficiency. Compared with similar studies, this work has significant advantages in core indicators such as bandwidth, number of notched bands, and isolation, providing new ideas for the design of UWB-MIMO systems in complex electromagnetic environments.

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Dr. Rongjiaxu Tu

Professor Han Lin

Professor Zhonggen Wang