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Analysis on Novel Metamaterial Resonator: A Critical Study to Enhance the Performance by Tuning Parameters

In this paper, a new approach on the characterization of dumbbell annular ring (DAR) resonators have been presented. Moreover, the electromagnetic nature of these resonators on different dimensions as well as their coupling strength to the host 50-Ω transmission line are investigated. Furthermore, an equivalent circuit model has been developed to understand their overall performance. In fact, from this model, the passband and stopband characteristics of DAR to the loaded transmission line are analyzed. Nevertheless, this study reveals that DAR provides an inductance which is less than 16% with respect to conventional defected ground structure (DGS), as well as the aspect ratio, can be tuned for certain analysis. This proposed resonator can be of great interest in terms of designing compact RF and microwave devices based on electromagnetic bandgap (EBG) concept.