A Tunable Constant-Absolute-Bandwidth Bandpass Filter with Switchable Ability

被引：1
作者：
Du, Tiejun [1 ]
Wei, Dujuan [1 ]
Zhang, Pengquan [1 ]
Guan, Boran [1 ]
Gu, Yue [2 ]
机构：
[1] Hangzhou Dianzi Univ, Sch Elect & Informat, Hangzhou 310018, Peoples R China
[2] Zhejiang Inst Mech & Elect Engn, Sch Automat, Hangzhou 310053, Peoples R China
来源：
ELECTRONICS | 2022年 / 11卷 / 07期
基金：
中国国家自然科学基金;
关键词：
tunable; CABW; BPF; switchable; CSR; TUNING RANGE; DESIGN;
D O I：
10.3390/electronics11071047
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
This paper presents a tunable bandpass filter (BPF) with constant absolute bandwidth (CABW) and switchable properties. The BPF is performed by using a tri-mode cross-shape resonator (CSR) loaded with varactors. The CABW and switchable ability are achieved by adjusting the resonant frequencies. Meanwhile, the two transmission zeros (TZs) produced by center-loaded stubs strengthen the skirt selectivity in the on-state and the isolation in the off-state. For demonstration, a tri-pole switchable BPF with three control voltages is implemented and verified, and the control mechanism is simple. In the on-state, it exhibits a 120 MHz, 3 dB CABW with the measured insertion loss (IL) of 2.2-2.5 dB in the tuning range of 0.816-1.188 GHz. In the off-state, the measured isolation is better than 27 dB.
引用
收藏
页数：10
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