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Compact microstrip lowpass filter with very sharp roll-off using meandered line resonators

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Abstract

In this paper, a new compact size microstrip lowpass filter (LPF) with a very sharp roll-off is presented to apply in the modern wireless networks. The proposed LPF is designed using the series main resonators with meandered lines based on inductor-capacitor (LC) equivalent circuit analysis. The main goal is to achieve maximum-sharp roll-off by maintaining a wide stopband bandwidth and high return loss (RL). The main resonator of the proposed filter is consisted of two meandered line hairpin resonators (MLHR), and a meandered line T-shaped resonator (MLTR). The designed suppressor is composed of two coupled radial stubs to create a wide stopband. Low return loss in the passband, which has been created by the main resonator, is resolved by the suppressor structure with high return loss. The measured results show a − 3 dB cut-off frequency of 1.93 GHz. The very sharp transition band starts at 1.93 to 1.97 GHz (from − 3 to − 20 dB). The stopband is from 1.97 to 19.9 GHz (with the suppression level of − 20 dB). Also, the total size of the proposed LPF is only 13.3 × 10.1 mm2.

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Authors and Affiliations

  1. Department of Electrical Engineering, Faculty of Engineering, Razi University, Tagh-E-Bostan, Kermanshah, 67149, Iran

    Mohsen Hayati & Sepehr Zarghami

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

    Farzin Shama

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  1. Mohsen Hayati
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  2. Sepehr Zarghami
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Correspondence to Mohsen Hayati.

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Hayati, M., Zarghami, S. & Shama, F. Compact microstrip lowpass filter with very sharp roll-off using meandered line resonators. Wireless Netw 27, 1203–1213 (2021). https://doi.org/10.1007/s11276-020-02509-7

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