Apparatus for treating tumors by evanescent waves

A method of using an apparatus for treating tumors, the method comprising:

• providing the apparatus comprising:
• an RF source generating an RF signal having a frequency of 100 kHz to 500 kHz at an output;
• an electrically conducting wire(s) or RF coaxial cable coupled to the output of the RF source;
• an open-ended coaxial waveguide antenna coupled to the electrically conducting wire or RF coaxial cable;
• and an electrical configuration comprising a pair of conductors at a voltage differential provided within the open-ended coaxial waveguide antenna to generate substantially a plurality of evanescent waves within a spatial volume, while reducing one or more travelling waves within the spatial volume generated by the electrical configuration;
• and a field distribution configured from the electrical configuration of the open-ended coaxial waveguide antenna and the field distribution characterizing the spatial volume;
• and
• positioning the spatial volume within a vicinity of a tumor such that the spatial positioning provides a higher strength electric field comprising the plurality of evanescent waves within the vicinity of the tumor and provides a lower strength electric field outside of the vicinity of the tumor.