“…The modified Lorentzian type dispersion rule is a commonly accepted model for dense arrays of split-ring resonators and other similar structures (in this case ), e.g., [9], [11], [16]. Certain composites containing natural magnetic constituents, e.g., composite substrates containing thin ferromagnetic films [30], can be modeled using the general Lorentzian model. Here we study for the sake of clarity the effect of static permeability using (2) since the general Lorentzian model reduces to (2) at low frequencies.…”