electromag.h

#pragma once
 
/*
        Various Useful Electromagnetism Utilities for nec2cpp
        
        Copyright (C) 2004-2006  Timothy C.A. Molteno
        
        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, write to the Free Software
        Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/
 
#include <cmath>
#include <complex>
 
#include "math_util.h"
 
namespace em
{
 
  class constants
  {
  public:
    static nec_float permittivity;
    static nec_float permeability;
  };
 
  // Calculate the power from a voltage and a current.
  inline nec_float power(nec_complex voltage, nec_complex current)  {
    return 0.5* real(voltage * conj(current));
  }
 
  // Electromagnetic Constants
 
  inline nec_float permittivity()  {
    return constants::permittivity;
  }
 
  inline nec_float permeability()  {
    return constants::permeability;
  }
 
  nec_float speed_of_light();
  nec_float impedance();
  nec_float inverse_impedance();
  nec_float impedance_over_2pi();
  
  inline nec_float get_wavelength(const nec_float& frequency) {
    return speed_of_light() / frequency;
  }
  
 
}