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1 results

  • A compact microstrip low-pass filter with ultra wide stopband using compact microstrip resonant cells

  • Saeed Roshani
  • Journal:
    International Journal of Microwave and Wireless Technologies / Volume 9 / Issue 5 / June 2017
    Published online by Cambridge University Press:
    25 October 2016, pp. 1023-1027

  • In this paper, a novel compact microstrip low-pass filter (LPF) with ultra wide stop band and sharp roll off, is proposed. In the proposed structure, a high impedance transmission line is loaded by compact microstrip resonant cells, which results in ultra wide stopband. The −3 dB cut-off frequency of filter is 1.5 GHz and the maximum insertion loss is <0.1 dB in the passband. The proposed LPF presents extremely wide stopband from 1.68 to 44 GHz, with more than the −20 dB attenuation level, which suppresses the 2nd to 29th harmonics with high rejection levels. The size of the proposed LPF is only 0.1 λg × 0.19 λg, which shows excellent size reduction. There is a good agreement between the simulated and measured results.