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Different corona models are investigated with reference to the propagation along lossy overhead multiconductor transmission lines of overvoltages due to direct lightning strokes. A nonlinear dynamic capacitance is introduced to simulate the nonlinear behavior of the q-v hysteretic loop and account for the losses associated with its area. For comparison, an equivalent circuit has been introduced to...
Performance of artificial planar screens composed of small magnetic elements are investigated through equivalent circuit models and a full-wave approach involving a periodic method-of-moments formulation. The conventional split-ring resonator screen is first studied and next the geometry of the single inclusion is modified in order to reduce the operating frequency of the screen. It is shown how the...
A planar screen made of a periodic array of small resonant particles showing a strong magnetic resonance is studied in detail. Two types of inclusions are considered: the double split-ring resonator (SRR) and the spiral resonator (SR). The homogenized screen is shown to behave as a homogeneous slab with an effective magnetic permeability having large positive or negative values around the magnetic...
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