Hairpin-shaped stripline split-ring resonators and their applications

The split-ring resonator made of an open-ended ring-shaped stripline connected at its ends with a lumped element capacitance has already been used in practice as a resonator element for an oscillator. If this lumped element capacitance is replaced with a distributed capacitance, the structure can be modified to a hairpin-shaped resonator with a distributed coupling circuit. This paper studies such fundamental characteristics as the resonant condition of this resonator. In addition, by using its characteristics, applications are proposed for multiple-stage filters and push-push oscillators. The design data are organized and a trial fabrication is carried out for verification. The experiment is carried out in the L band. From the results, it is found that the resonator of this configuration is small in size and has high degrees of freedom. The structure can be applied to MIC or MMIC at much higher frequencies.