An investigation on resonance characteristics of CPS open-loop resonator

A novel coplanar stripline (CPS) open-loop resonator (OLR) is proposed for maximum miniaturization in uniplanar microwave applications. The effect of variation in the width of longer strips of OLRs formed in two ways (namely, CPS fixed gap and CPS variable gap structures) on their resonance characteristics is discussed. It is also shown that the variable gap OLR structure supports a wider upper stopband including the first spurious resonance frequency.