Progress In Electromagnetics Research C · 2009 · 47 citations · 13 references
EngineeringElectrical EngineeringDesign TheoryMicrowave EngineeringResponsive DesignImpedance MatchingMicrostrip CircuitsMicrowave FiltersMicrowave Integrated CircuitsMicrowave ResonatorsResonant CircuitsBandstop FiltersFiltersMicrostrip Bandstop FiltersMicrostrip FiltersMicrowave Filter DesignMicrowave Filter SynthesisMiniaturized FiltersStepped-impedance Filters
A novel circuit structure of dual-band bandstop fllters is proposed in this paper. This structure comprises two shunt-connected tri-section stepped impedance resonators with a transmission line in between. Theoretical analysis and design procedures are described. The derived synthesis equations have two degrees of freedom which provide more design ∞exibility in fllter synthesis. Notably, three advantages of the proposed fllter structure lie in the fact of its increased nonuniform impedances, resulting in a compact size, wide range of realizable frequency ratio, and more realizable impedances. Three experimental dual-band bandstop fllters with various frequency ratios were fabricated to demonstrate the feasibility of the new fllter structure.
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