Line-waveguide converter having plural electrode cells and radio communication device using such a converter

A line-waveguide converter comprising:

• a dielectric substrate;
• a first face electric conductor disposed on a first face of the dielectric substrate;
• a waveguide attached to a second face of the dielectric substrate opposite the first face and having electrical conduction to the first face electric conductor;
• and
• a plurality of electrodes disposed inside the waveguide on the second face,
• wherein the plurality of electrodes are identical in shape and size,
• wherein the intervals between adjoining electrodes of the plurality of electrodes are identical, and
• wherein at least one electrode of the plurality of electrodes is a feed electrode to which power is fed from a line.