The Journal of China Universities of Posts and Telecommunications ›› 2024, Vol. 31 ›› Issue (3): 80-86.doi: 10.19682/j.cnki.1005-8885.2024.1001

Previous Articles     Next Articles

Compact multilayer liquid crystal polymer lowpass filter with 8-shaped inductor

Liu Weihong , Wang Guoxiu, Liu Qingran   

  1. School of Electronic Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710121, China
  • Received:2022-11-11 Revised:2023-07-02 Online:2024-06-30 Published:2024-06-30
  • Contact: Liu Weihong E-mail:liuweihong@xupt.edu.cn
  • Supported by:
    the Shaanxi Provincial Innovation Team Project (2020TD-019), and the Xi'an Sciences Plan Project (21XJZZ0075).

Abstract: Lumped element lowpass filter (LPF) for ultra-high frequency (UHF) radio frequency (RF) front-end system is
presented based on multilayer liquid crystal polymer (LCP). The lumped element LPF can achieve miniaturization
and one transmission zero on the stopband by the 8-shaped inductor. The lumped element LPF is fabricated on a 4-
layer LCP substrate with a compact size of 9 mm × 14 mm × 0.193 mm. The measured cut off frequency of the
lumped element LPF is 0.5 GHz with insertion loss (IL) less than 0.37 dB. Both measured and simulated results
suggest that it is a possible candidate for the application of UHF RF front-end system.

Key words: lowpass filter (LPF), multilayer liquid crystal polymer (LCP), miniaturization, 8-shaped inductor