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2025 , Vol. 30 >Issue 2: 227 - 232

DOI: https://doi.org/10.1007/s12204-023-2622-y

Engieering and Technology

Compact Integrated Lumped-Element Bandpass Filter Loaded with Defected Ground Structure Based on Multilayer Liquid Crystal  Polymer Substrate

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  • School of Electronic Engineering, Xi’an University of Posts and Telecommunications, Xi’an 710121, China

Accepted date: 2022-03-27

  Online published: 2025-03-21

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Abstract

Design of a miniaturized lumped-element bandpass filter in multilayer liquid crystal polymer technology  is proposed. Fractional bandwidth of the bandpass filter is 20%, operating at a center frequency of 500MHz. In  order to further reduce the size and improve the performance of the proposed filter, defected ground structure (DGS) has been implemented in the filter. Based on this structure, the volume of the inductor is reduced by 60% efficiently compared with the inductor without DGS, and the Q-factor is increased up to 257% compared  with the traditional multilayer spiral inductor. The measured results indicate that the designed filter has a very  sharp stopband, an insertion loss of 2.3 dB, and a return loss of 18.6 dB in the passband. The whole volume of  the fabricated filter is 0.032λg × 0.05λg × 0.000 75λg, where λg is the guided wavelength of the center frequency. The proposed filter is easily integrated into radio-frequency/microwave circuitry at a low manufacturing cost,  especially wireless communication.

Cite this article

LIU Weihong, CHEN Yuan, HUANG Qian, LIU Qingran . Compact Integrated Lumped-Element Bandpass Filter Loaded with Defected Ground Structure Based on Multilayer Liquid Crystal  Polymer Substrate[J]. Journal of Shanghai Jiaotong University(Science), 2025 , 30(2) : 227 -232 . DOI: 10.1007/s12204-023-2622-y

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