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A Miniaturized Square Cavity SIW Dual-Band BPF with Slotted Koch Snowflake Fractal Based Design

International Journal of Electrical and Electronics Engineering
© 2023 by SSRG - IJEEE Journal
Volume 10 Issue 10
Year of Publication : 2023
Authors : Ali A. Abdulhasan, Ali J. Salim, Jawad K. Ali
10.14445/23488379/IJEEE-V10I10P113
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How to Cite?

Ali A. Abdulhasan, Ali J. Salim, Jawad K. Ali, "A Miniaturized Square Cavity SIW Dual-Band BPF with Slotted Koch Snowflake Fractal Based Design," SSRG International Journal of Electrical and Electronics Engineering, vol. 10,  no. 10, pp. 126-136, 2023. Crossref, https://doi.org/10.14445/23488379/IJEEE-V10I10P113

Abstract:

This article presents a dual-band fractal-based Bandpass Filter (BPF) for Substrate-Integrated Waveguides (SIWs) for the first time. The suggested filter is built by cutting a slit into the structure’s top layer, Koch Snowflake fractal style. The Fractional Bandwidth (FBW) at 7.7 GHz for the first band of the downsized BPF is 9.45 percent, while the FBW at 9.65 GHz for the second passband is 8.8 percent. In addition to reducing the SIW cavity’s footprint, the downsized filter has improved Sparameter features, such as a narrower upper rejection band and a narrower lower rejection band. The filter’s dimensions are approximately 0.917 × 0.917 λg2 or 21.6 × 21.6 mm2 . The substrate used is Rogers RO4350B, with a relative dielectric constant of 3.48, a loss tangent of 0.0037, and a thickness of 0.762 mm. The validity of the proposed design has been verified through simulations using CST, HFSS, and Sonnet software. A prototype of the BPF has been fabricated and tested, showing good agreement between the predicted and measured results. The work also examines the impact of stub loading and its absence on the isolation between bands and the generation of TZs at 4.26, 8.3, 8.63, 11.66, and 14.2 GHz to enhance the selectivity of the proposed filter.

Keywords:

Dual-band BPF, Koch snowflake fractal, Substrate Integrated Waveguide (SIW), CST, Sonnet.

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