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Design of an ultra-sharp composite low-pass filter using analytical method

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Abstract

An ultra-sharp microstrip composite low-pass filter (LPF) with proper structure using analytical method is proposed. A composite LPF using image parameter method and lumped elements is designed is this paper. Then, quasi-lumped elements, such as: open-stub lines, high and low impedance lines and standard microstrip equations are utilized to microstrip implementation. In addition, parasitic substance of the quasi-lumped capacitors are compensated. Moreover, reduce the size of the microstrip filter, the curved microstrip lines are applied. A proposed composite LPF with a cutoff frequency of 1.3 GHz is designed and fabricated. The proposed device has great specifications, such as: ultra-sharp cutoff (600 dB/GHz), compact size (0.100λg × 0.168λg) and high suppression level in stopband (− 35 dB). The measured frequency responses of the proposed LPF, have good agreement with simulation results, which show the validity of the results. With this specifications the proposed filter is suitable for L-band applications.

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Authors and Affiliations

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

    Alireza Golestanifar & Saeed Roshani

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  1. Alireza Golestanifar
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  2. Saeed Roshani
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Correspondence to Saeed Roshani.

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Golestanifar, A., Roshani, S. Design of an ultra-sharp composite low-pass filter using analytical method. Analog Integr Circ Sig Process 100, 249–255 (2019). https://doi.org/10.1007/s10470-018-1358-3

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  • DOI: https://doi.org/10.1007/s10470-018-1358-3

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