NOVEL TRI-BAND BANDPASS FILTER WITH ONE HIGH SELECTIVE TUNABLE PASSBAND

作者：Du, Xuekun; You, Chang Jiang^*; Cai, Jingye; He, Zhaosheng; Shen, Mengkui; Jiang, Yuting

来源：Microwave and Optical Technology Letters, 2017, 59(6): 1464-1468.

DOI：10.1002/mop.30562

• high selectivity
• source-load coupling
• tri-band bandpass filter
• tunable filter
• varactor-loaded square split ring resonator

A novel tri-band bandpass filter (BPF) with one high selective tunable passband is presented in this letter. The tri-band band-pass- filtering response is implemented by using a pair of varactor-loaded square split rings, an open stub and a one-end shorted closed-loop ring. By loading an open stub at the central position of the proposed resonator, the odd-mode resonance can be split into two modes for generating high selective tunable passband. The simulated and measured results are in good agreement. The measured results indicate that the first-passband is fixed at 760 MHz with a 3-dB bandwidth of 40 MHz, and the third-passband is fixed at 2300 +/- 35 MHz with 4.7-6.2% 3-dB fractional bandwidth. The measured second-passband is with a 3-dB constant bandwidth of 95 +/- 10 MHz and its centre frequency has 360 MHz tunable range.

• 出版日期2017-6
• 单位电子科技大学