Title :
Narrow bandpass filter based on the modified DGS
Author :
Abdelaziz, Marwa ; Safwat, Amr M E ; Podevin, Florence ; Vilcot, Anne
Author_Institution :
UMR, Grenoble
Abstract :
In this paper, a bandpass filter based on the modified defected ground structure (MDGS) is proposed and its corresponding transmission line (TL) model is developed as well. The resulting bandpass filter provides 1.89 dB insertion loss and 19.2% relative bandwidth. A second order narrow bandpass filter is then investigated by closely coupling two unit cells. This leads to an improvement of 44% in the quality factor. The resulting passband insertion loss is 2.27 dB and the relative bandwidth is 10.7% around 4.2 GHz. Both structures were realized on FR4 substrate, EM simulation, TL model, as well as measurement results are in a very good agreement.
Keywords :
Q-factor; band-pass filters; microwave filters; transmission line theory; EM simulation; FR4 substrate; TL model; modified DGS; modified defected ground structure; narrow bandpass filter; passband insertion loss; quality factor; transmission line model; Band pass filters; Bandwidth; Circuits; Coplanar waveguides; Couplings; Filtering theory; Insertion loss; Neck; Periodic structures; Poles and zeros;
Conference_Titel :
Microwave Conference, 2007. European
Conference_Location :
Munich
Print_ISBN :
978-2-87487-001-9
DOI :
10.1109/EUMC.2007.4405129
