volume | PIER Journals

Abstract

This paper proposes a novel microstrip patch antenna element and MIMO design based on quarter-mode substrate integrated waveguide (QMSIW). This design not only achieves antenna miniaturization but also effectively reduces the mutual coupling between antenna elements. The antenna element employs a triangular patch as the main radiator, with its long side grounded via two metal cavities. For bandwidth enhancement, a T-shaped strip is positioned at the center of the triangular patch's long side, and a new mode is introduced. A pair of slots is etched at the junction between the strip and the patch; adjusting the slot size enables dual-mode operation and control coupling. Building on this element, a 2 × 2 MIMO system is developed, featuring a compact size and requiring only one dielectric substrate, thereby achieving high integration and low cost. The patch occupies an area of (0.22 × 0.22λ₀²)/2, while the strip occupies 0.066 × 0.068λ₀² with high integration. The antenna achieves N78 band coverage with a total area of 0.0287λ₀². Experimental results demonstrate an 8.9% -10 dB impedance bandwidth (3.30-3.61 GHz) and -16 dB isolation, ensuring excellent overall performance. The antenna offers an effective solution for future 5G wireless communication systems.

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Dr. Xiao-Mei Ni

Dr. Xin-Hao Ding