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Quad-band bandstop filter modeled by comprising quad-section stepped-impedance resonator

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Abstract

This paper presents the implementation of symmetric folded meandered-line structure that includes a quad-section stepped impedance resonator (QSIR). The existence of four stop bands at 1.81/5.16/8.08/10.90 GHz was successfully synthesized by the incorporation of QSIR comprising an electrical length of 0.84λg–0.19λg–0.15λg–0.22λg. The throughput of the filter was further improved by the inclusion of five attenuation poles at 340 MHz, 3.24, 6.38, 9.45, and 11.92 GHz with the rejection levels of − 32.19, − 25.19, − 28.68, − 21.57, − 32.63 dB, respectively. The concept achieves a wide fractional bandwidth of 59/18.23/13.86/10.46% at 1.81/5.16/8.08/10.90 GHz, respectively. Noticeable attenuation of − 25 dB at the respective stop bands in the frequency range of 2.34–1.28, 5.60–4.66, 8.56–7.44, and 11.35–10.21 GHz, with a spurious-free response up to 13 GHz was confirmed. Furthermore, a sharp response is demonstrated by a simulation and shows strong agreement with the measurement results.

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Acknowledgements

This research was supported by the National Research Foundation of Korea (NRF) Grant funded by the Korea Government (MISP) (2016R1A4A1011761). The part of this research was also supported by the research Grant of Sejong University in 2018.

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Authors and Affiliations

  1. Department of Computer Science and Engineering, Sejong University, Seoul, 05006, Republic of Korea

    Rajendra Dhakal

  2. Department of Culture Contents and Convergence ICT, Songho University, 210, Hoengseon, Gangwon-do, Republic of Korea

    Seongsoo Cho

  3. Department of Electronic Engineering, Kwangwoon University, Seoul, 01897, Republic of Korea

    Bhanu Shrestha

  4. Department of Applied Mathematics, Kongju National University, Kongju, 32588, Republic of Korea

    Changho Seo

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  1. Rajendra Dhakal
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  2. Seongsoo Cho
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  3. Bhanu Shrestha
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  4. Changho Seo
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Correspondence to Seongsoo Cho or Changho Seo.

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Dhakal, R., Cho, S., Shrestha, B. et al. Quad-band bandstop filter modeled by comprising quad-section stepped-impedance resonator. Analog Integr Circ Sig Process 98, 147–153 (2019). https://doi.org/10.1007/s10470-018-1260-z

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  • DOI: https://doi.org/10.1007/s10470-018-1260-z

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