volume | PIER Journals

Abstract

This paper presents a compact dual-band two-element multiple-input multiple-output (MIMO) antenna for terminal-device wireless communication. The antenna element is based on a rectangular patch, and miniaturization is achieved by combining slot loading with a partial ground plane. A complementary split-ring resonator (CSRR) introduces an additional resonant mode, enabling dual-band operation. A 2 × 1 MIMO configuration is formed by arranging two elements in parallel. To reduce mutual coupling, a four-stage T-shaped hybrid-slot decoupling structure with E-, L-, window-, and spiral-shaped slots is introduced on a common ground plane, effectively suppressing surface current coupling. The dimension of the antenna is 0.45λ₀ × 0.31λ₀ × 0.019λ₀. The antenna operates over 3.17-4.37 GHz and 4.76-5.02 GHz, with a port isolation better than -20 dB over both bands, reaching -34.58 dB at 3.52 GHz and -22.79 dB at 4.87 GHz. The envelope correlation coefficient (ECC) is below 0.005, and the diversity gain (DG) is approximately 10 dB. The measured results agree with the simulated ones. These results indicate that the proposed antenna achieves a good balance between compact size and high isolation, making it suitable for size-constrained terminal MIMO applications.

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Dr. Xuebin Peng

Dr. Jiabei Zhu

Dr. Yajing Liu

Dr. Zhi Song

Prof. Yanbing Xue