BC-SRRBroadside-Coupled Split Ring Resonator
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Of interest for telecommunication circuits and space applications are the frequency variation sensors based on CSRRs, useful to determine the dielectric constant of microwave substrates, and the amplitude modulation sensors based on BC-SRRs, which are able to provide the angular velocity of rotating cylinders and are therefore of potential interest to replace optical sensors in reaction wheels, or for the determination of the angular position in pointing mechanisms, among others.
The resonators on each layer are 180[degrees] rotated version with resonators on the other layer, making the configuration as a multilayer BC-SRR structure.
From the measured frequency responses (Figures 9 and 20) of the standard EC-SRR and the proposed multilayer BC-SRR, there is 35% reduction in resonant frequency and circuit size is reduced by 50%.
The frequency shift between the simulated and measured results (Figures 18 and 20) of the proposed multilayer BC-SRR structure is due to the presence of air gap between the fabricated bottom and top layers.
There is 35% reduction in the resonant frequency compared to standard cross-coupled EC-SRR structure and 25% reduction in resonant frequency when compared to the single substrate BC-SRR structure.
The typical structure of broadside-coupled split-ring resonators (BC-SRRs) is shown in Figure 10.