The Journal of China Universities of Posts and Telecommunications ›› 2022, Vol. 29 ›› Issue (5): 99-104.doi: 10.19682/j.cnki.1005-8885.2022.0016

• Others • Previous Articles    

Compact multilayer dual-band bandpass filter design using stepped impedance resonators

Han Yunan1, Liang Peiyun1, Lin Yang2, Cheng Chunyue3, Yao Yuchen1, Jin Ming1, Dai Lin4#br#   

  • Received:2021-12-02 Revised:2022-03-16 Online:2022-10-31 Published:2022-10-28
  • Contact: Yu-Nan HAN E-mail:clark-han@139.com

Abstract:

Compact dual-band bandpass filter (BPF) for the 5th generation mobile communication technology (5G) radio frequency (RF) front-end applications was presented based on multilayer stepped impedance resonators (SIRs). The multilayer dual-band SIR BPF can achieve high selectivity and four transmission zeros (TZs) near the passband edges by the quarter-wavelength tri-section SIRs. The multilayer dual-band SIR BPF is fabricated on a 3-layer FR-4 substrate with a compact dimension of 5.5 mm ×5.0 mm ×1.2 mm. The measured two passbands of the multilayer dual-band SIR BPF are 3.3 GHz -3.5 GHz and 4.8 GHz -5.0 GHz with insertion loss (IL) less than 2 dB respectively. Both measured and simulated results suggest that it is a possible candidate for the application of 5G RF front-end at sub-6 GHz frequency band.

Key words: 5G RF front-end| bandpass filter (BPF)| stepped impedance resonator (SIR)| strip line, transmission zero (TZ)