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Tri-Band Bandpass Filter With Sharp Passband Skirts Designed Using Tri-Section SIRs

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3 Author(s)
Hsu, C.-I.G. ; Da-Yeh Univ., Changhua ; Ching-Her Lee ; Yi-Huan Hsieh

This letter presents a second-order tri-band bandpass filter (BPF) designed using tri-section stepped-impedance resonators (TSSIRs). The impedance ratios of the TSSIRs were computed using the formulas expressed as functions of the passband center frequencies, which are located at 1.57, 2.45, and 3.5 GHz. A cross-coupled configuration was arranged to sharpen the passband skirts. The newly designed tri-band BPF was verified by circuit implementation and very good agreement between the simulated and measured results was observed.

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:18 ,  Issue: 1 )

Date of Publication:

Jan. 2008

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