4.7 Article

Cross-Band Mutual Coupling Reduction in Dual-Band Base-Station Antennas With a Novel Grid Frequency Selective Surface

期刊

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
卷 69, 期 12, 页码 8991-8996

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2021.3098514

关键词

Antenna arrays; Antennas; Frequency selective surfaces; Mutual coupling; Dual band; Metals; Surface impedance; Dual-band antenna; grid frequency selective surface (GFSS); shared-aperture antenna array

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A novel GFSS has been developed for cross-band near-field mutual coupling suppression in a 5G dual-band antenna array, effectively reducing the cross-band mutual coupling coefficients in the B1 band.
In this communication, a grid frequency selective surface (GFSS) is developed for cross-band near-field mutual coupling suppression. The unit cell of the GFSS consists of a break metal strip and a parallel LC resonator. The GFSS realizes low-stop property at 1.7-2.4 GHz (B1 band) and high-pass property at 3.3-3.8 GHz (B2 band). The novel GFSS is applied in a 5G dual-band antenna array with one B1 band antenna and four B2 band antennas. The cross-band mutual coupling coefficients are reduced from -14 dB to lower than -35 dB at the B1 band. Meanwhile, the radiation patterns of the B2 band antenna element are not affected due to the nonscattering feature of the GFSS. The dual-band base-station antenna array prototype is fabricated and measured to demonstrate the effectiveness of the proposed design in cross-band mutual coupling reduction.

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