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PIER PIER B PIER C PIER M PIER Letters PIER Photonics
2025-01-18
Design of a Compact Wideband Filtering Antenna with High Frequency Selectivity
By
Hao Gui,

    Mr. Hao Gui

    Anhui University of Science and Technology

    China

    Homepage

Zhonggen Wang,

    Professor Zhonggen Wang

    College of Electrical and Information Engineering

    Anhui University of Science and Technology

    China

    Homepage

Wenyan Nie,

    Professor Wenyan Nie

    College of Mechanical Electrical Engineering

    Huainan Normal University

    China

    Homepage

Ming Yang,

    Dr. Ming Yang

    Department of Electrical and Communications Engineering

    West Anhui University

    China

    Homepage

Mingqing Wang

    Mr. Mingqing Wang

    School of Electrical and Information Engineering

    Anhui University of Science and Technology

    China

    Homepage

Progress In Electromagnetics Research M, Vol. 131, 27-35, 2025
doi:10.2528/PIERM24112503 | Google Scholar

Abstract
A low-profile monolayer filtering antenna with compact size is presented in this paper. The antenna features a simple structure, comprising a substrate, a stepped defective ground structure, an asymmetric Y-shaped branch, and a microstrip feedline with an L-shaped branch. The asymmetric Y-shaped branch and L-shaped branch feedline collaborate to introduce two additional resonant frequency points, thereby broadening the impedance bandwidth. Furthermore, two radiation nulls are introduced on either side of the passband, which enhances the frequency selectivity of the band edges and optimizes the antenna's radiating and filtering performances. To verify the proposed design, a prototype of the compact filtering antenna was fabricated and measured. The measured and simulated results show good agreement. The design achieves a wide impedance bandwidth of 44.6% (4.88~7.68 GHz) at a center frequency of 6.22 GHz, a peak realized gain of 5.7 dBi, and a compact size of 35 mm × 29 mm × 0.8 mm. Two radiation nulls on either side of the passband result in an excellent bandpass response, with out-of-band rejection reaching 18.2 dB. Finally, the antenna's excellent radiation performance and filtering characteristics make it suitable for wireless communication applications in the 5G Sub-6 GHz and WiFi-6E bands.
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Citation
Hao Gui, Zhonggen Wang, Wenyan Nie, Ming Yang, and Mingqing Wang, "Design of a Compact Wideband Filtering Antenna with High Frequency Selectivity," Progress In Electromagnetics Research M, Vol. 131, 27-35, 2025.
doi:10.2528/PIERM24112503
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