Title :
A novel open-loop DGS for compact bandstop filter with improved Q factor
Author :
Yang, Maohui ; Xu, Jun ; Dong, Yuliang ; Yu, Mengxia ; Lee, Guiping
Author_Institution :
Inst. of Appl. Phys., Univ. of Electron. Sci. & Technol. of China, Chengdu
Abstract :
A novel slot-shaped defected ground structure (DGS) on the microstrip line to provide a band-rejection property with an improved Q factor is proposed in this paper. It has a size of only 11% of conventional dumbbell DGS unit section and 26.8% of U sharp DGS unit section, while the Q factor is 7.6 times than dumbbell DGS and 3.2 times than U-sharp DGS at the same resonant frequency of 4.88 GHz. A minimized two-pole bandstop filter based on the newly proposed DGS is designed and simulated. It has a 3 dB cutoff frequency of 3.38 GHz with 37 dB rejection in the stopband from 3.63 to 3.75 GHz, the size of the filter is less than 0.35 lambdag times 0.16 lambdag.
Keywords :
Q-factor; band-stop filters; microstrip filters; band-rejection property; compact bandstop filter; frequency 3.38 GHz; frequency 3.63 GHz to 3.75 GHz; frequency 4.88 GHz; improved Q factor; microstrip line; open-loop DGS; slot-shaped defected ground structure; two-pole bandstop filter; Attenuation; Capacitance; Cutoff frequency; Filters; Inductance; Microstrip; Photonic band gap; Q factor; Resonance; Resonant frequency;
Conference_Titel :
Antennas, Propagation and EM Theory, 2008. ISAPE 2008. 8th International Symposium on
Conference_Location :
Kunming
Print_ISBN :
978-1-4244-2192-3
Electronic_ISBN :
978-1-4244-2193-0
DOI :
10.1109/ISAPE.2008.4735297
