Novel Band-Reject Microwave Filter by C-Shaped DGS with Improved Q Factor

Abstract

Abstract-In this paper a novel C-shaped Defected Ground Structure (DGS) on a microstrip line is proposed to provide a frequency rejection property with an improved Q factor at 2.4 GHz. Compared to the other DGS introduced structures in literature, the new structure has a simple and compact shape and its rejection characteristic is steeper at the stop band than the other reported structures. Different parameters of the DGS have been optimized for the best frequency response to reject the centre frequency. The proposed DGS is successfully designed and fabricated and the measured results are in a very good agreement with the simulated results.

New compact dual-band bandstop filter

“…412-5.484 GHz (Ciampa and Olenewa 2007). Several kinds of dual-band bandstop filters have been introduced in the literature (Woo and Lee 2005;Lee, Oh, and Myung 2006;Tseng and Itoh 2006;Chin, Yeh, and Chao 2007;Lim, Kim, Shin, and Yu 2007;Chao and Qun 2008;Abunjaileh and Hunter 2009;Chin and Lung 2009;Hu 2009;Tang, Hong, and Chun 2009;Kakhki and Neshati 2010;Xiao and Zhu 2011). The coupled short-circuited quarter-wavelength stubs, stepped-impedance stubs, composite right/left handed metamaterial transmission lines, spur-line resonators, defected ground structures (DGS) in the form of the spiral and split ring resonators etc.…”