https://scholars.lib.ntu.edu.tw/handle/123456789/324126
標題: | Electronically Switchable Bandpass Filters Using Loaded Stepped-Impedance Resonators | 作者: | Shih-Fong Chao Chao-Huang Wu Zou-Ming Tsai HUEI WANG Chun Hsiung Chen |
關鍵字: | Coupled-resonator bandpass filter; Stepped-impedance resonator; Switch; Switchable filter | 公開日期: | 2006 | 卷: | 54 | 期: | 12 | 起(迄)頁: | 4193--4201 | 來源出版物: | IEEE Transactions on Microwave Theory and Techniques | 摘要: | Stepped-impedance resonators with diodes loaded at one end are used to develop switchable bandpass filters in this paper. The loaded diodes are used to switch the resonance conditions of the stepped-impedance resonators. The equations for resonance conditions of the stepped-impedance resonators with different loads at one end are derived and discussed. With these derived equations, the switchable filters can be easily designed and synthesized using the coupled-resonator filter theory. When the switchable filter is switched on, a bandpass filter response with a wide stopband rejection is achieved by making the on-state coupled resonators have the same fundamental resonant frequency, but different higher order resonant frequencies. When switched off, a high and wideband isolation is obtained by properly misaligning the resonant modes of the off-state resonators. The design concept is demonstrated by two single-pole-single-throw fourth-order Butterworth-type switchable microstrip bandpass filters, which utilize two and three switched stepped-impedance resonators, respectively. Finally, a compact single-pole-double-throw switchable microstrip bandpass filter using common resonators is demonstrated for wireless communication applications. © 2006 IEEE. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-33847751890&doi=10.1109%2fTMTT.2006.885898&partnerID=40&md5=93beb969cc0b3dd8c85295f7a3464d46 | DOI: | 10.1109/tmtt.2006.885898 |
顯示於: | 電機工程學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。