Abstract
In this article, a compact ultra wideband (UWB) bandpass filter (BPF) with sharp rejection skirt is realized using quintuple-mode stub-loaded resonator.The resonator can generate three odd-modes and two even-modes in the desired band. By simply adjusting the lengths of open stubs in shunt and short-circuited stubs, the first five resonant modes of the resonator can be roughly allocated within the 3.1–10.6 GHz UWB band meanwhile the sixth resonant mode in the upper-stopband can be suppressed. The pair of short stubs can generate two transmission zeros near the lower and upper cut-off frequencies, leading to a sharp rejection skirt. Finally, a quintuple-mode UWB BPF is designed and fabricated and the measured results demonstrate the feasibility of the design process. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2579–2580, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25520
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