Title :
A wide stopband CPW low pass filter using quarter wavelength stepped impedance resonators
Author :
Lin, Hao-Jia ; Chen, Xiao-Qun ; Shi, Xiao-Wei ; Chen, Lei ; Bai, Yan-Fu
Author_Institution :
Nat. Key Lab. of Sci. & Technol. on Antennas & Microwaves, Xidian Univ., Xi´´an, China
Abstract :
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.
Keywords :
band-stop filters; coplanar waveguides; electric impedance; low-pass filters; microwave filters; resonator filters; CPW spurline resonator; bandstop characteristics; coplanar waveguide; fabricated low pass filter; frequency 3.5 GHz; frequency 3.7 GHz to 11 GHz; quarter wavelength stepped impedance resonator; tapered quarter wavelength short circuited stubs SIR; wide stopband CPW low pass filter; Attenuation; Circuit simulation; Coplanar waveguides; Electromagnetic waveguides; Frequency; Impedance; Low pass filters; Periodic structures; Spurline; Wavelength measurement;
Conference_Titel :
Microwave and Millimeter Wave Technology (ICMMT), 2010 International Conference on
Conference_Location :
Chengdu
Print_ISBN :
978-1-4244-5705-2
DOI :
10.1109/ICMMT.2010.5525289
