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A Highly Selective Stripline Lowpass Filter with More Than 100-dB Wide Stopband Attenuation


A new miniature design of a highly selective lowpass filter based on a suspended substrate with a two-sided stripline pattern has been developed. The filter frequency response slope (cutoff attenuation rate) and stopband attenuation depth are determined by transmission zeros, the number of which is equal to the filter order. An experimental prototype of a fifth-order lowpass filter on 0.5-mm-thick alumina substrate with dielectric permittivity ε = 9.8 has been synthesized with the aid of numerical electrodynamic analysis of a three-dimensional model. The cutoff frequency of the filter passband at a –1-dB level is   fc = 1.75 GHz. The stopband width at a –100-dB attenuation level reaches 4.4fc.

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This study was supported in part by the Ministry of Education and Science of the Russian Federation in the framework of agreement no. 02G25.31.0330.

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Correspondence to B. A. Belyaev.

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The authors declare that they have no conflict of interest.

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Translated by P. Pozdeev

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Belyaev, B.A., Serzhantov, A.M., Leksikov, A.A. et al. A Highly Selective Stripline Lowpass Filter with More Than 100-dB Wide Stopband Attenuation. Tech. Phys. Lett. 46, 364–367 (2020).

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  • lowpass filter
  • substrate
  • stripline resonator
  • stopband.