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Miniaturized sharp band-pass filter based on complementary electric-LC resonator

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Abstract

In this paper, a novel application of complementary electric-LC (CELC) resonator as a basic element to synthesize miniaturized sharp band-pass filters is introduced. The proposed metamaterial band-pass filter is a three-stage CELC-based device, where two shunt short-circuited stubs are employed in the input and output stages and a series gap is etched in the middle stage. By these means, a high-selectivity prototype band-pass filter with 2 % fractional bandwidth in S band is designed and fabricated. The out-of-band attenuation is better than 40 dB, and the upper and lower transition bands are also quite sharp due to the presence of two transmission zeros (nearly 60 and 30 dB fall in 0.2 GHz at lower and upper edges, respectively). Moreover, the filter is substantially miniaturized with a size of effective region of 1.3 cm × 1 cm at 2.9 GHz, which is quite smaller relative to conventional designs with the same performance. The fabrication and measurement of the proposed filter configuration attest to its expected desirable features. Therefore, the application of CELC resonator is proposed for super-compact sharp band-pass filters.

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Authors and Affiliations

  1. Electrical and Electronic Engineering Department, Shahed University, Tehran, Iran

    Yalda Torabi & Golamreza Dadashzadeh

  2. Department of Electrical Engineering, Iran University of Science and Technology, Tehran, Iran

    Homayoon Oraizi

Authors
  1. Yalda Torabi
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  2. Golamreza Dadashzadeh
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  3. Homayoon Oraizi
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Correspondence to Yalda Torabi.

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Torabi, Y., Dadashzadeh, G. & Oraizi, H. Miniaturized sharp band-pass filter based on complementary electric-LC resonator. Appl. Phys. A 122, 273 (2016). https://doi.org/10.1007/s00339-016-9787-2

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  • DOI: https://doi.org/10.1007/s00339-016-9787-2

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