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105 lines
4.1 KiB
C++
105 lines
4.1 KiB
C++
/*
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* Copyright The KiCad Developers, see AUTHORS.txt for contributors.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this package; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef TRANSLINE_CALCULATIONS_COUPLED_STRIPLINE_H
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#define TRANSLINE_CALCULATIONS_COUPLED_STRIPLINE_H
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#include <transline_calculations/transline_calculation_base.h>
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#include <transline_calculations/stripline.h>
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/*
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* This implements the calculations described in:
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*
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* [1] S. B. Cohn, "Characteristic Impedance of the Shielded-Strip Transmission Line," in Transactions of the IRE
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* Professional Group on Microwave Theory and Techniques, vol. 2, no. 2, pp. 52-57, July 1954
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* [2] S. B. Cohn, "Shielded Coupled-Strip Transmission Line," in IRE Transactions on Microwave Theory and Techniques,
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* vol. 3, no. 5, pp. 29-38, October 1955
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*/
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class COUPLED_STRIPLINE : public TRANSLINE_CALCULATION_BASE
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{
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using TCP = TRANSLINE_PARAMETERS;
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public:
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COUPLED_STRIPLINE() :
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TRANSLINE_CALCULATION_BASE( { TCP::SKIN_DEPTH, TCP::Z0_E, TCP::Z0_O, TCP::Z_DIFF, TCP::PHYS_WIDTH,
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TCP::FREQUENCY, TCP::PHYS_LEN, TCP::H, TCP::PHYS_S, TCP::T, TCP::EPSILONR,
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TCP::MURC, TCP::SIGMA, TCP::ANG_L } )
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{
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}
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/// Analyse track geometry parameters to output Z0 and Ang_L
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void Analyse() override;
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/// Synthesis track geometry parameters to match given Z0
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bool Synthesize( SYNTHESIZE_OPTS aOpts ) override;
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private:
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/// Sets the output values and status following analysis
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void SetAnalysisResults() override;
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/// Sets the output values and status following synthesis
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void SetSynthesisResults() override;
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/// Calculates the impedance of a finite-width single strip
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double calcZ0SymmetricStripline();
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/// Calculate the coupling fringe capacitances
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void calcFringeCapacitances( double h, double t, double er );
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/// Calculates impedances of finite- and zero-thickness single strips
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void calcSingleStripImpedances();
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/// Calculates zero-thickness coupled strip impedances
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void calcZeroThicknessCoupledImpedances( double h, double w, double s, double er );
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/// Calculates even mode Z0
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void calcZ0EvenMode();
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/// Calculates odd mode Z0
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void calcZ0OddMode( double t, double s );
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/// Calculates conductor and dielectric losses
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void calcLosses();
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/// Calculate dialectric and propagation parameters
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void calcDielectrics();
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double C_f_0{ 0.0 }; ///< Fringing capacitance from one edge to ground of zero thickness strip
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double C_f_t_h{ 0.0 }; ///< Fringing capacitance of single strip of finite width
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double Z0_w_h_0{ 0.0 }; ///< Impedance of single strip of zero thickness
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double Z0_w_h_t_h{ 0.0 }; ///< Impedance of single strip of finite thickness
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double Z0_e_w_h_0_s_h{ 0.0 }; ///< Even mode impedance of coupled zero thickness strips
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double Z0_o_w_h_0_s_h{ 0.0 }; ///< Odd mode impedance of coupled zero thickness strips
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double e_eff_e{ 0.0 }; ///< Even mode effective dielectric constant
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double e_eff_o{ 0.0 }; ///< Odd mode effective dielectric constant
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double ang_l{ 0.0 }; ///< Angular length (rad)
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double unit_prop_delay_e{ 0.0 }; ///< Even mode unit propagation delay (ps/cm)
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double unit_prop_delay_o{ 0.0 }; ///< Odd mode unit propagation delay (ps/cm)
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/// Calculator used to determine single stripline values
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STRIPLINE m_striplineCalc;
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};
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#endif //TRANSLINE_CALCULATIONS_COUPLED_STRIPLINE_H
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