An Ultra Wide-Stopband Lowpass Filter Using Smooth Transmission Line

Li, Chao; Peng, Wenchao; Wang, Zheng; Lai, Haoxiang

doi:10.1109/icmmt.2018.8563525

Cited by 1 publication

(1 citation statement)

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“…A compact LPF is presented in [4] based on defected ground structure; however, this method has a complex fabrication process, which could be restrictive in many applications [5]. In [6], an ultra-wide stopband LPF is designed with a sharp response, but this filter has a complicated structure. Stepped-impedance structures, open tubs and radial-shaped resonators have widely been used in designing microstrip filters, particularly lowpass filters with a large stopband [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Half-Elliptical Resonator Lowpass Filter with a Wide Stopband for Low Band 5G Communication Systems

et al. 2021

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In this paper, a lowpass filter is designed using half elliptical resonators with a wide stopband. New formulas are presented to achieve a circuit model for the half elliptical resonators used in this work. Additionally, the transfer function and transmission zero equations are used to adjust the frequency of the transmission zeros of the filter. The cut-off frequency of the lowpass filter is 1.26 GHz with a sufficiently large stopband, extending from 1.48 GHz to 20 GHz. The proposed filter’s figure of merit is 62,520, demonstrating its outperformance compared to the state of the art. The filter is implemented on a RT-5880 substrate with a constant dielectric of 2.2, thickness of 31 mil and loss tangent of 0.0009. The LPF was fabricated and tested, showing good agreement between the simulated and measured results.

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