http://www.scikit-rf.org

http://scikit-rf.org/documentation.html

http://groups.google.com/group/scikit-rf

https://github.com/scikit-rf/scikit-rf/wiki/Development

sckit-rf is an object-oriented approach to RF/Microwave engineering implemented in the Python programming language. It provides a general set of objects and features which can be used to construct solutions to specific problems.