Abstract

We study the dynamics of two microwave split ring resonators broadside coupled to each other, varying twist angle θ between them, as shown in Fig. 1(a). A similar system operating at near infra-red frequencies was presented in [1]. We show our experimental and numerical results in Fig. 1(b). For θ = 0°, there are two resonances ω_S and ω_AS, and by inspection of the currents in the rings we verify that these correspond to the expected symmetric and anti-symmetric modes. As θ increases, ω_AS increases and ω_S decreases, reaching their maximum and minimum values respectively at θ = 180°. For our chosen parameters the resonances appear to cross at θ_c ≈ 33°, in contrast to [1], where an avoided crossing of resonances was reported.

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