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An ultrawideband bandpass filter with steeply sloped rejection using stub-loaded resonator

✍ Scribed by Jin Xu; Changzhou Hua; Bo Li; Hui Wang; Chen Miao; Wen Wu

Publisher: John Wiley and Sons
Year: 2011
Tongue: English
Weight: 304 KB
Volume: 54
Category: Article
ISSN: 0895-2477
DOI: 10.1002/mop.26538

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✦ Synopsis

Abstract

An ultrawideband (UWB) bandpass filter with steeply sloped rejection is proposed in this article. The proposed filter has five transmission poles inside the passband and four transmission zeros on both side of passband. Using the even‐ and odd‐mode analysis method, closed‐form formulas for the position of poles and zeros are given. Finally, a UWB bandpass filter is fabricated and measured. The simulation and measurement agree well with each other. Furthermore, due to the two tunable transmission zeros very close to the filter passband, the fabricated filter has 136‐ and 72‐dB/GHz slopes in the lower and upper transition band. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 54:326–329, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26538

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GHz. For this reason, the spacing t was selected to be 1.0 mm for the prototype constructed here. The radiation characteristics of the constructed prototype were also studied. Figures 7 and8 plot the measured radiation patterns at the center frequencies (2442 and 5500 MHz) for the 2.4-GHz and 5.2/5