Electrical cable with dielectric foam

An electrical cable comprising:

• a monolithic inner electrical insulator that comprises an electrically insulative material that is foamed so as to define a plurality of pores in the electrically insulative material;
• a pair of electrical conductors each surrounded by the inner electrical insulator along at least a majority of their respective lengths, wherein the electrical conductors are oriented substantially parallel to each other and spaced apart from each other;
• an electrically conductive shield that is disposed about at least a majority of a respective overall length of the inner electrical insulator;
• and
• an outer electrical insulator that surrounds at least a majority of a respective overall length of the electrically conductive shield,
• wherein the electrical cable includes only a single electrically insulative material disposed inside the electrical shield, and
• wherein the inner electrical insulator defines a radially outer perimeter that is substantially continuous and uninterrupted by open pores, wherein the radially outer perimeter is oval or racetrack shaped.