Novel coplanar-waveguide bandpass filters using loaded air-bridge enhanced capacitors and broadside-coupled transition structures for wideband spurious suppression

Shih Cheng Lin, Tsung Nan Kuo, Yo Shen Lin, Chun Hsiung Chen

研究成果: 雜誌貢獻期刊論文同行評審

28 引文 斯高帕斯(Scopus)

摘要

Novel inline coplanar-waveguide (CPW) bandpass filters composed of quarter-wavelength stepped-impedance resonators are proposed, using loaded air-bridge enhanced capacitors and broadside-coupled microstrip-to-CPW transition structures for both wideband spurious suppression and size miniaturization. First, by suitably designing the loaded capacitor implemented by enhancing the air bridges printed over the CPW structure and the resonator parameters, the lower order spurious passbands of the proposed filter may effectively be suppressed. Next, by adopting the broadside-coupled microstrip-to-CPW transitions as the fed structures to provide required input and output coupling capacitances and high attenuation level in the upper stopband, the filter with suppressed higher order spurious responses may be achieved. In this study, two second- and fourth-order inline bandpass filters with wide rejection band are implemented and thoughtfully examined. Specifically, the proposed second-order filter has its stopband extended up to 13.3 f0, where f0 stands for the passband center frequency, and the fourth-order filter even possesses better stopband up to 19.04 f0 with a satisfactory rejection greater than 30 dB.

原文???core.languages.en_GB???
文章編號1668354
頁(從 - 到)3359-3368
頁數10
期刊IEEE Transactions on Microwave Theory and Techniques
54
發行號8
DOIs
出版狀態已出版 - 8月 2006

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