Novel U-slot and V-slot DGSs for bandstop filter with improved Q factor

Author

Woo, Duk-Jae ; Lee, Taek-Kyung ; Lee, Jae-Wook ; Pyo, Cheol-Sig ; Choi, Won-kyu

Author_Institution

Sch. of Electron., Telecommun., & Comput. Eng., Hankuk Aviation Univ., Goyang

Volume

54

Issue

6

fYear

2006

fDate

6/1/2006 12:00:00 AM

Firstpage

2840

Lastpage

2847

Abstract

Novel slot-shaped defected ground structures (DGSs) on the microstrip line are presented to provide a band-rejection property with an improved Q factor. Two different geometries (U-slot and V-slot) are investigated. U-slot and V-slot DGSs have simple shapes compared to the conventional DGSs, however, they provide more steep rejection characteristics. The Q factor of the band-rejection property for the U-slot DGS increases when the distance between two slots in the U-shape decreases. Similarly, the V-slot DGS provides a higher Q characteristic when the slot angle is reduced. Two bandstop filters are designed and fabricated employing three cascaded U-slot DGSs and V-slot DGSs, respectively. Experimental result shows that the high-Q band-rejection filter with three U-slot DGSs provides Q of 38.6. A fabricated filter with three cascaded V-slot DGSs also rejects the signals at the frequencies from 3.5 to 4.3 GHz with more than 20-dB suppression

Keywords

Q-factor; band-stop filters; microstrip filters; 3.5 to 4.3 GHz; Q factor; U-slot defected ground structure; V-slot defected ground structure; band-rejection property; bandstop filter; microstrip line; steep rejection characteristics; Frequency; Metamaterials; Microstrip filters; Microwave filters; Periodic structures; Photonic band gap; Power harmonic filters; Resonance; Shape; Spirals; U-slot defected group structure (DGS); V-slot DGS;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2006.875450

Filename

1643624