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Vertical Response Microstrip Lowpass Filter Using Stepped Impedance Lines and Radial Resonators

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Abstract

By exploiting stepped impedance and radial resonators, a new microstrip lowpass filter (LPF) with a vertical transition band is proposed, analyzed and fabricated. Three resonators are properly combined to form a high performance filter. To validate the design theory, each resonator is analyzed by L–C equivalent circuit and transfer function and also equation of first transmission zero (TZ) in each resonator are computed. The proposed filter has a cut-off frequency at 2.086 GHz. By generating three TZs, a narrow transition band of 0.078 GHz and a roll-off rate of 474 dB/GHz are attained. Moreover, the filter occupies only 0.118 × 0.272 \(\lambda_{g}^{2}\), where λ g is the guided wavelength at 2.086 GHz. Furthermore, a rejection level better than 30 dB in a wide stopband is obtained. Finally, the proposed LPF achieves an extremely high figure-of-merit of 71,330.

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Acknowledgements

The authors would like to thank Mr. Saeed Raziani, for fabrication and measurement.

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Authors and Affiliations

  1. Young Researchers and Elite Club, Hamedan Branch, Islamic Azad University, Hamedan, Iran

    Seyed Mohammad Hadi Mousavi

  2. Department of Electrical Engineering, Faculty of Engineering, Razi University, Kermanshah, Iran

    Seyed Vahab Al-Din Makki

  3. Department of Electrical Engineering, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Saeed Raziani

  4. Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran

    Hesam Siahkamari

  5. School of Electrical and Electronic Engineering, The University of Adelaide, Adelaide, SA, 5005, Australia

    Seyed Ali Malakooti

Authors
  1. Seyed Mohammad Hadi Mousavi
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  2. Seyed Vahab Al-Din Makki
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  3. Saeed Raziani
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  4. Hesam Siahkamari
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  5. Seyed Ali Malakooti
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Correspondence to Seyed Mohammad Hadi Mousavi.

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Mousavi, S.M.H., Makki, S.V.AD., Raziani, S. et al. Vertical Response Microstrip Lowpass Filter Using Stepped Impedance Lines and Radial Resonators. Wireless Pers Commun 97, 633–645 (2017). https://doi.org/10.1007/s11277-017-4527-2

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  • DOI: https://doi.org/10.1007/s11277-017-4527-2

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