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A wide stopband CPW low pass filter using quarter wavelength stepped impedance resonators

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5 Author(s)
Hao-Jia Lin ; Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi''an, China ; Xiao-Qun Chen ; Xiao-Wei Shi ; Lei Chen
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A novel wide stopband coplanar waveguide (CPW) low pass filter (LPF) using quarter wavelength stepped impedance resonators (SIR) is presented. The bandstop characteristics of the quarter wavelength short circuited stubs SIR are demonstrated. By cascading three tapered quarter wavelength short circuited stubs SIR and a CPW spurline resonator, the fabricated low pass filter has sharp rejection with cutoff frequency of 3.5 GHz, and deep attenuation from 3.7 GHz to 11 GHz lower than -24 dB. Good agreement between simulated and measured results is demonstrated.

Published in:

Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on

Date of Conference:

8-11 May 2010