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Quadruple-Mode UWB Bandpass Filter With Improved Out-of-Band Rejection

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2 Author(s)
Sai Wai Wong ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore ; Lei Zhu

A quadruple-mode ultra-wideband (UWB) bandpass filter with sharp out-of-band rejection is presented in this work. As a starting part of designing a quadruple-mode filter, a mode graph of the initial triple-mode resonator is studied to choose its proper dimensions. Based on these pre-determined dimensions of this triple-mode resonator, two short-circuited stubs are introduced in this resonator to generate two transmission zeros near the lower and upper cut-off frequencies, leading to a higher rejection skirt outside the desired passband. Moreover, as these two stubs are installed, the fourth resonant mode falls down and works together with the first three resonant modes to form a novel quadruple-mode UWB filter. Finally, a filter prototype is designed and fabricated to experimentally validate the attractive in-band and out-of-band performances as predicted in theory.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:19 ,  Issue: 3 )

Date of Publication:

March 2009

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