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2025 , Vol. 30 >Issue 2: 233 - 238

DOI: https://doi.org/10.1007/s12204-023-2659-y

Engieering and Technology

Novel Compact Dual-Band Bandpass Filter 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: 2023-02-13

  Online published: 2025-03-21

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Abstract

In this paper, a compact defected ground structure loaded ultra high frequency dual-band bandpass filter is designed and implemented based on multilayer liquid crystal polymer technology. This novel filter is simply composed with several lumped and semi-lumped elements, to create a dual-passband response. In order to enhance the out-of-band rejection, a feedback capacitor Cz at the in/out ports of the filter is introduced, and four transmission zeros (TZs) are obtained outside the pass band. Furthermore, the position of TZs can be determined by adjusting the value of Cz. The schematic and design process of the filter are given in this paper. The center frequencies of dual-band bandpass filter are 0.9GHz and 2.45GHz, and the 3-dB bandwidths are 13.7% and 14.3%, respectively. The circuit size is 11mm × 9.5mm × 0.193mm. The proposed filter has been fabricated and tested, and the measured result is in good agreement with the simulation result.

Cite this article

Liu Weihong, Liu Qingran . Novel Compact Dual-Band Bandpass Filter Based on Multilayer Liquid Crystal Polymer Substrate[J]. Journal of Shanghai Jiaotong University(Science), 2025 , 30(2) : 233 -238 . DOI: 10.1007/s12204-023-2659-y

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