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Novel fractal-based dual-mode quasi-elliptic microstrip band-pass filter for WLAN applications

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Abstract

This article presents the design of a compact quasi-elliptic dual-mode microstrip band-pass filter deploying a novel Sierpinski–Knopp fractal geometry on a patch resonator. In this work, a rectangular perturbation is inserted at the diagonal edge of the resonator with fractal slots to realize dual-mode response with two transmission zeros near each skirt. The fractal BPF is designed, simulated, and measured at the resonant frequency of 2.38 GHz for wireless local area network applications. The fabricated filter exhibits insertion loss less than 1.43 dB, return loss greater than 14.33 dB with a 3-dB narrow fractional bandwidth of 4.62%. Moreover, it has a compact size of 24.6 × 24.6 mm2, suitable for the requirements of wireless communication systems. A good agreement is obtained between the simulated and measured results for the proposed filter design.

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The authors did not receive support from any organization for the submitted work.

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Authors and Affiliations

  1. Department of Electronics and Communication Engineering, Sri Sivasubramaniya Nadar College of Engineering, Kalavakkam, 603 110, Tamil Nadu, India

    S. Karthie & S. Lakshmi Manibala

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  1. S. Karthie
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  2. S. Lakshmi Manibala
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Contributions

All authors contributed to the study conception and design of band-pass filter. Material preparation, simulation, and analysis of microstrip dual-mode filter in this proposed work were performed by SK and SLM. The first draft of the manuscript was written by SK, and both the authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to S. Karthie.

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Karthie, S., Manibala, S.L. Novel fractal-based dual-mode quasi-elliptic microstrip band-pass filter for WLAN applications. Appl. Phys. A 129, 199 (2023). https://doi.org/10.1007/s00339-023-06495-3

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