Browsing by Author "Freeborn, Todd J."

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    Compact Wide Frequency Range Fractional-Order Models of Human Body Impedance against Contact Currents
    (2016-02-23) Freeborn, Todd J.; Elwakil, Ahmed S.; Maundy, Brent
    Three circuit models using constant phase elements are investigated to represent the human body impedance against contact currents from 40 Hz to 110 MHz. The parameters required to represent the impedance are determined using a nonlinear least squares fitting (NLSF) applied to the averaged human body impedance dataset. The three fractional-order models with 4, 6, and 7 parameters are compared to an already existing integer-order, 11-parameter model. Simulations of the fractional-order models impedance are presented and discussed along with their limitations.
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    Fractional Resonance-Based Filters
    (2013-02-10) Freeborn, Todd J.; Maundy, Brent; Elwakil, Ahmed
    We propose the use of a fractional order capacitor and fractional order inductor with orders ,  , respectively, in a fractional series circuit to realize fractional-step lowpass, highpass, bandpass, and bandreject filters. MATLAB simulations of lowpass and highpass responses having orders of , 1.5, and 1.9 and bandpass and bandreject responses having orders of 1.5 and 1.9 are given as examples. PSPICE simulations of 1.1, 1.5, and 1.9 order lowpass and 1.0 and 1.4 order bandreject filters using approximated fractional order capacitors and fractional order inductors verify the implementations.