The Effect of the Loop Strip Width of CPW Open-Loop Resonator on Its Resonance Characteristics

A novel coplanar waveguide (CPW) open-loop resonator (OLR) is proposed for maximum miniaturization in uniplanar microwave applications. The effect of variation in the one's width of longer strips of OLR formed in two ways (namely, CPW fixed gap (FG) and CPW variable gap (VG) OLR) on their resonance characteristics is discussed. Also, simple empirical expressions indicating the effect of variation in the strip width are derived for estimation of the resonance frequency as a function of the variable strip width and the fundamental resonance frequency of the standard CPW loop resonator.