Experimental design of bandstop filters based on unconventional defected ground structures

ABSTRACT A modified design of band stop filters using unconventional defected ground structures (DGS) is presented. The new proposed structures have conventional dumbbell DGS and spiral DGS integrated with U‐slots. These microstrip structures provide high selectivity and Q‐factor. By integrating the...

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Bibliographic Details
Published in:Microwave and optical technology letters 2016-12, Vol.58 (12), p.2969-2973
Main Authors: Annam, Kaushik, Kumar Khah, Sunil, Dooley, Steven, Cerny, Charles, Subramanyam, Guru
Format: Article
Language:English
Subjects:
band stop filters
defected ground structures (DGS)
Design defects
Dielectrics
dumbbell U-slot
Grounds
Microwaves
Plugs
Ripples
spiral U-slot
Spirals
Sporting goods
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Summary:ABSTRACT A modified design of band stop filters using unconventional defected ground structures (DGS) is presented. The new proposed structures have conventional dumbbell DGS and spiral DGS integrated with U‐slots. These microstrip structures provide high selectivity and Q‐factor. By integrating the U‐slot to the conventional structures, the overall capacitance and inductance increase which results in shift of resonance frequency from3.434 GHz to2.323 GHz for modified dumbbell and from 1.818 GHz to 1.702 GHz for modified spiral structure. Sharp transition is achieved from pass band to stop band and reduced ripples in the pass band for the new proposed DGS while the DGS sizes remain the same. The proposed designs were fabricated and tested on a dielectric substrate with dielectric permittivity of 10. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:2969–2973, 2016
ISSN:0895-2477
1098-2760
DOI:10.1002/mop.30192