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Phase Plug Modelling and Analysis: Circumferential Versus Radial Types

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Mechanical modeling of a simple phase plug yields an electrical-mobility equivalent circuit; a single-frequency notch filter. This applies directly to "normal" circumferential-slit configurations. The analysis is then applied to a radial-slit phase plug, which is shown to be a smoother, wide-range filter. Photographs of radial-slit prototypes and comparative performance curves are shown. Performance agrees with theory.

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