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2026-05-31
Characteristic Mode-Inspired Ultra-Wideband Dual-Band Notched Four-Port MIMO Antenna
By
Progress In Electromagnetics Research C, Vol. 171, 75-86, 2026
Abstract
In this paper, a dual-band-notched ultra-wideband MIMO antenna fed by a microstrip line is designed. The ultra-wideband characteristics are obtained by etching a semi-elliptical notch on a circular radiation patch. For the achievement of dual-band-notched features, a U-shaped slot and an inverted U-shaped slot are employed. Additionally, the Characteristic Mode Analysis (CMA) is used to verify and analyze the notch-band and broadband characteristics. Each ground plate is connected by adding a cross-shaped branch, and a circular ring is loaded to further improve antenna isolation (|S21|). This antenna is implemented on an FR4 substrate, and its whole size is 60 mm × 60 mm × 0.8 mm. The measured findings verify that the antenna functions within a broad bandwidth ranging 3.12-21.2 GHz (relative bandwidth 148.6%) and two frequency band rejections of 5.94-7.17 GHz and 12.49-13.92 GHz, effectively suppressing the 6G band, which belongs to the international satellite mobile communication system and the Ku band downlink. The port isolation exceeds 20 dB, the ECC is below 0.04, and the diversity gain (DG) is in excess of 9.97, all of which demonstrate the antenna's excellent diversity performance and superior radiation characteristics. The antenna is a frontrunner for next-generation wireless communication applications.
Citation
Luyi Ji, Chengzhu Du, Yongkang Yang, and Fangrui Zhang, "Characteristic Mode-Inspired Ultra-Wideband Dual-Band Notched Four-Port MIMO Antenna," Progress In Electromagnetics Research C, Vol. 171, 75-86, 2026.
doi:10.2528/PIERC26042904
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