Title :
Miniaturized microstrip lowpass filter with wide stopband using double equilateral U-shaped defected ground structure
Author :
Ting, Sio-Weng ; Tam, Kam-Weng ; Martins, R.P.
Author_Institution :
Dept. of Electr. & Electron., Univ. of Macau, Macao, China
fDate :
5/1/2006 12:00:00 AM
Abstract :
A compact double equilateral U-shaped defected ground structure (DGS) unit is proposed. In contrast to a single finite attenuation pole characteristic offered by the conventional dumbbell DGS, the proposed DGS unit provides dual finite attenuation poles that can be independently controlled by the DGS lengths. A 2.4-GHz microstrip lowpass filter using five cascaded double U-shaped DGS units is designed and compared with conventional DGS lowpass filters. This low pass filter achieves a wide stopband with overall 30-dB attenuation up-to10 GHz and more than 42% size diminution.
Keywords :
UHF filters; band-stop filters; low-pass filters; microstrip filters; poles and zeros; 2.4 GHz; U-shaped defected ground structure; UHF; double equilateral defected ground structure; dual finite attenuation poles; miniaturized microstrip lowpass filter; wide stopband filter; Attenuation; Band pass filters; Etching; Microstrip filters; Microwave circuits; Microwave filters; Minimization; Passband; Photonic band gap; Radio frequency; Attenuation pole; U-shaped; defected ground structure (DGS); size reduction; wide stopband;
Journal_Title :
Microwave and Wireless Components Letters, IEEE
DOI :
10.1109/LMWC.2006.873592
