期刊
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
卷 69, 期 7, 页码 3164-3168出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSII.2022.3156725
关键词
Film bulk acoustic resonators; Band-pass filters; III-V semiconductor materials; Aluminum nitride; Wideband; Resonant frequency; Microwave filters; Extremely wideband; hybrid filter; frequency selectivity; low insertion loss; transmission zeros and poles; transmission lines; coupled lines; FBAR networks
资金
- National Natural Science Foundation of China [U20A20203, 61971052, U21A20510]
- National Special Support Program for High-Level Personnel Recruitment [2018RA2131]
- Beijing Natural Science Foundation [JQ19018]
- Fundamental Research Funds for the Central Universities [2021XD-A07-1]
This paper proposes an extremely wideband hybrid bandpass filter with high selectivity and low insertion loss. By utilizing two FBAR networks and compensating through CLs and TLs, the passband is effectively controlled.
An extremely wideband hybrid bandpass filter (BPF) with high selectivity and low insertion loss is proposed in this brief. The hybrid BPF is composed of three coupled lines (CLs), six matching transmission lines (TLs) and two film bulk acoustic resonator (FBAR) networks with ladder-type structure. These two FBAR networks can help greatly enhance the upper and lower sideband roll-off of the hybrid BPF. At the same time, the passband is compensated by CLs and TLs. The odd-even mode theory is used to analyze the hybrid BPF to obtain the analytical solutions. Through electromagnetic-acoustic co-simulation and optimization, a hybrid BPF with extremely wideband is fabricated and measured. A discussion on the deviation between the simulation and the measured results is presented. The measured hybrid BPF has a 3-dB fractional bandwidth of 56 %, a minimum insertion loss of 1.733 dB and a shape factor of 0.83 simultaneously.
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