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Bandwidth Enhancement of Bow-tie Microstrip Patch Antenna Using Defected Ground Structure for 5G

Dian Widi Astuti 1, Rizki Fadilah 1, Muslim 1, Dian Rusdiyanto 1, Syah Alam 2, and Yuyu Wahyu 3
1. Universitas Mercu Buana, Departemen of Engineering, Jakarta 11650, Indonesia
2. Universitas Trisakti Departemen of Engineering, Jakarta 11440, Indonesia
3. Research Centre for Electronics and Telecommunications, Indonesian Institute of Sciences, Bandung 40135, Indonesia

Abstract—A microstrip antenna suffers from a narrow bandwidth because of the thickness of the substrate. This paper presents a wideband microstrip antenna by using Defected Ground Structure (DGS) on a bow-tie microstrip patch antenna. The cross-dumbbell shaped slot is used as DGS on the ground layer. The cross-dumbbell DGS slot is put on the backside of the transmission line. The antenna is designed using Computer Simulation Technology (CST) microwave studio and on the commercially printed circuit board substrate, i.e., the FR-4 substrate. The antenna is set for 5G applications, which use 3.67 GHz as the frequency center. By using DGS, the simulated reflection coefficient (S11) for VSWR ≤ 2 shows the fractional bandwidth increase from 2.6% to 10.45%. The measured reflection coefficient matches the simulated results where the measurement gives 13.37% for fractional bandwidth.
Index Terms—Bandwidth enhancement, defected ground structure, Bowtie patch, 5G antenna, microstrip antenna

Cite: Dian Widi Astuti, Rizki Fadilah, Muslim, Dian Rusdiyanto, Syah Alam, and Yuyu Wahyu, "Bandwidth Enhancement of Bow-tie Microstrip Patch Antenna Using Defected Ground Structure for 5G," Journal of Communications vol. 17, no. 12, pp. 995-1002, December 2022. Doi: 10.12720/jcm.17.12.995-1002

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