Title :
A Design of Cascaded CPW Low-Pass Filter With Broad Stopband
Author :
No, Jin-Won ; Hwang, Hee-Yong
Author_Institution :
Dept. of Electr. & Electron. Eng, Kangwon Nat. Univ.
fDate :
6/1/2007 12:00:00 AM
Abstract :
A coplanar waveguide low-pass filter (LPF) using two different LPF unit cells (LUCs) and a small defected ground structure (DGS) unit cell (DUC) is presented. By cascading two LUCs, which are different in structure and harmonic passbands, and combining a dumbbell-like-shaped DUC to the cascaded LPF, we extended the stopband to seven times the cutoff frequency. The proposed LPF is superior to the conventionally cascaded LPF, in which the same LUCs are used, in reduction of the harmonic passbands and the size. The fabricated LPF shows a compact size of 18.2mm times 11mm, the cutoff frequency of 3GHz, and the sharp skirt response like a fifth-order LPF with two notch frequencies. The measured frequency responses agree well with the simulated ones
Keywords :
band-stop filters; cascade networks; coplanar waveguide components; frequency response; low-pass filters; microwave filters; 11 mm; 18.2 mm; 3 GHz; broad stopband filter; cascaded CPW filter; coplanar waveguide filter; defected ground structure; frequency responses; harmonic passband; low-pass filter; sharp skirt response; size reduction; Coplanar waveguides; Cutoff frequency; Frequency measurement; Helium; Low pass filters; Microwave filters; Passband; Power harmonic filters; Radio frequency; Transmission lines; Coplanar waveguide (CPW); defected ground structure (DGS); harmonic passband; low-pass filter (LPF); size reduction;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2007.897790
