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This article presents a simple structure for reducing mutual coupling between two diversity planar monopole antennas for WLAN 5.2/5.8 GHz applications. The structure has two λ/4 (λwavelength in the substrate) slots cut into the ground plane between the two monopoles. In 0.5λ o (λ o-wavelength in the air) of the antenna spacing, mutual coupling was −33.3, −21.1 dB at 5.2, 5.8 GHz, respectively. The lowest mutual coupling of −33.3 dB was achieved at 5.2 GHz, which are 20.8 dB improvements over the reference.

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