dielectric_djordjevic_sarkar.h

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/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright The KiCad Developers, see AUTHORS.TXT for contributors.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
 
#ifndef TRANSLINE_CALCULATIONS_DIELECTRIC_DJORDJEVIC_SARKAR_H
#define TRANSLINE_CALCULATIONS_DIELECTRIC_DJORDJEVIC_SARKAR_H
 
#include <complex>
 

class DIELECTRIC_DJORDJEVIC_SARKAR
{
public:
    void Fit( double aEpsRSpec, double aTanDSpec, double aFSpec, double aF1 = 1.0e3,
              double aF2 = 1.0e12 );

    std::complex<double> ComplexEpsilonAt( double aF ) const;

    double EpsilonRealAt( double aF ) const;

    double TanDeltaAt( double aF ) const;
 
    double GetEpsilonInf() const { return m_epsInf; }
    double GetM() const { return m_m; }
    bool   IsLossless() const { return m_lossless; }
 
private:
    double m_epsInf   = 1.0;
    double m_m        = 0.0;
    double m_f1       = 1.0e3;
    double m_f2       = 1.0e12;
 
    // Avoids a complex-log evaluation on every query when tan delta is zero.
    bool   m_lossless = true;
};
 
#endif