volume | PIER Journals

Abstract

Based on the current trends in wireless communication systems, a novel high-isolation dual-notch ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna is proposed, measuring 46 mm × 46 mm × 0.8 mm. The antenna is printed on an RO4350 substrate and consists of two identical antennas placed orthogonally. The antenna unit features a third-order stepped rectangular structure and employs microstrip feeding, incorporating inverted U-shaped and M-shaped grooves etched onto the antenna unit to achieve dual-notch functionality, thereby addressing electromagnetic interference issues in wireless local area networks (WLAN) operating at 5.15-5.85 GHz and 7.25-7.75 GHz. To address the issue of mutual coupling in MIMO antennas, this paper presents an innovative decoupling method known as the RMS-ZINC approach. This technique involves excavating a T-shaped groove on the rear of the dielectric substrate, symmetrically aligned with the diagonal, and filling it with a dielectric material primarily composed of zinc. This material substitution effectively manipulates the coupling current paths, achieving a high isolation level of -20 dB. The experimental results show that the operating bandwidth of the antenna ranges from 2.89 to 10.19 GHz, with a peak gain of approximately 5 dB (7.15 dBi) and a maximum radiation efficiency of up to 92%. The measured results are essentially consistent with the simulated ones, indicating the practical application value of the proposed MIMO antenna with notch functionality.

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Dr. Shuming Liu

Professor Jingchang Nan

Dr. Yifei Wang

Mr. Licong Fan

Dr. Jianxin Qi