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Compact lowpass filter with sharp roll-off and wide stopband using dual-stepped impedance resonator

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Abstract

A lowpass filter unit with sharp roll-off and wide stopband using dual-stepped impedance resonator (DSIR) is presented. The lowpass filter unit is composed of DSIR, open circuited stubs, and high-impedance transmission lines. DSIR mainly dominates the passband and stopband width while open stubs are used to enhance the suppression level with one transmission zero. Three transmission zeros are introduced to stopband and one closed to passband edge. Thus, a very sharp transition can be achieved. A compact lowpass filter with sharp roll-off rate of 201 dB/octave, wide stopband of 5.9f c , and high suppression level of 30 dB was obtained when two asymmetric units were cascaded.

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Authors and Affiliations

  1. Institute of Microelectronics, Chinese Academy of Sciences, Beijing, 100029, China

    ZeBao Du, Hao Yang, HaiYing Zhang & Min Zhu

Authors
  1. ZeBao Du
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  2. Hao Yang
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  3. HaiYing Zhang
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  4. Min Zhu
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Correspondence to Hao Yang.

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Du, Z., Yang, H., Zhang, H. et al. Compact lowpass filter with sharp roll-off and wide stopband using dual-stepped impedance resonator. Sci. China Inf. Sci. 57, 1–6 (2014). https://doi.org/10.1007/s11432-014-5137-1

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  • DOI: https://doi.org/10.1007/s11432-014-5137-1

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