標題: | A Fully Tunable Two-Pole Bandpass Filter |
作者: | Chi, Pei-Ling Yang, Tao Tsai, Tsung-Ying 電機資訊學士班 Undergraduate Honors Program of Electrical Engineering and Computer Science |
關鍵字: | Bandwidth-control network;constant absolute-bandwidth;fully tunable;source-load coupling |
公開日期: | 1-五月-2015 |
摘要: | In this letter, a two-pole tunable combline filter that allows for operational agility of the center frequency, passband bandwidth, and locations of upper and lower transmission zeros is proposed. To increase the tunable range of constant absolute-bandwidth for all frequency tuning states, a novel T-type bandwidth-control network was devised between resonators to flexibly tune the coupling coefficient without limitations imposed by the available varactor capacitance. By use of tunable source-load coupling, two tunable transmission zeros were produced on both sides of the passband to significantly improve filter selectivity and to dynamically afford interference suppression. A second-order 1.7-2.7 GHz filter with 1 dB constant bandwidth tuning from 50 to 110 MHz and transmission zero locations tuning from 300 to 700 MHz with respect to the passband was developed and fabricated. Good agreement was obtained between the simulated and experimental results. |
URI: | http://dx.doi.org/10.1109/LMWC.2015.2409794 http://hdl.handle.net/11536/124648 |
ISSN: | 1531-1309 |
DOI: | 10.1109/LMWC.2015.2409794 |
期刊: | IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS |
Volume: | 25 |
起始頁: | 292 |
結束頁: | 294 |
顯示於類別: | 期刊論文 |