python-necpp: Antenna simulation in python

This module allows you to do antenna simulations in Python using the nec2++ antenna simulation package.

This is a wrapper using SWIG of the C interface, so the syntax is quite simple. Have a look at the file necpp_src/example/test.py, for an example of how this library can be used.

Tim Molteno. tim@physics.otago.ac.nz

News

  • Version 2.2.x Latest releases including Eigen-based matrix solver and modern Python packaging (pyproject.toml, uv support).

Install

As of version 1.6.1.2 swig is no longer required for installation. Simply use PIP as follows:

pip install necpp

To build from source with uv:

uv build
uv pip install .

Documentation

Try help(necpp) to list the available functions. The functions available are documented in the C-style API of nec2++. This is available here

Using

The following code calculates the impedance of a simple vertical monopole antenna over a perfect ground.

import necpp

def handle_nec(result):
  if (result != 0):
    print(necpp.nec_error_message())

def impedance(frequency, z0, height):
  
  nec = necpp.nec_create()
  handle_nec(necpp.nec_wire(nec, 1, 17, 0, 0, z0, 0, 0, z0+height, 0.1, 1, 1))
  handle_nec(necpp.nec_geometry_complete(nec, 1, 0))
  handle_nec(necpp.nec_gn_card(nec, 1, 0, 0, 0, 0, 0, 0, 0))
  handle_nec(necpp.nec_fr_card(nec, 0, 1, frequency, 0))
  handle_nec(necpp.nec_ex_card(nec, 0, 0, 1, 0, 1.0, 0, 0, 0, 0, 0)) 
  handle_nec(necpp.nec_rp_card(nec, 0, 90, 1, 0,5,0,0, 0, 90, 1, 0, 0, 0))
  result_index = 0
  
  z = complex(necpp.nec_impedance_real(nec,result_index), 
              necpp.nec_impedance_imag(nec,result_index))
  
  necpp.nec_delete(nec)
  return z

if __name__ == "__main__":
  z = impedance(frequency = 34.5, z0 = 0.5, height = 4.0)
  print("Impedance \t(%6.1f,%+6.1fI) Ohms" % (z.real, z.imag))

More Information

Have a look at [http://github.com/tmolteno/necpp] for more information on using nec2++.

Project links

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Credits

Author: Tim Molteno

License expression

GPL-3.0-only
View SPDX License List

Requires

Python >=3.11

Tags

nec2 nec2++ antenna electromagnetism radio

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