GEOMETRICAL STRUCTURES AND FUNDAMENTAL CHARACTERISTICS OF MICROWAVE STEPPED-IMPEDANCE RESONATORS

lambda(g)/4-, lambda(g)/2-, and lambda(g)-type transmission-line stepp ed-impedance resonators (SIR's) have been proposed and various practic al applications have been reported on the basis of the analysis relate d to each resonator, This paper standardizes these three types of SIR' s and systematically summarizes their fundamental characteristics, suc h as resonance conditions, resonator length, spurious (higher order) r esponses, and equivalent circuits. Practical applications which employ features of three types of SIR's are investigated with demonstrations of specific structures, Original design formulas with respect to lamb da(g)-type dual-mode resonators are analytically derived, Advanced SIR 's using composite material and multisteps are also introduced and the ir availability is discussed.