Directive Window Ablation Antenna with Dielectric Loading

A method of manufacturing an electrosurgical device, comprising the steps of:

• providing a coaxial feedline having an inner conductor, an outer conductor, and a dielectric material disposed therebetween;
• joining an electrically-conductive member to a distal end of the inner conductor at a distal end of the coaxial feedline;
• forming a dielectric layer around a distal portion of the outer conductor;
• forming an electrically-conductive layer around a proximal portion of the dielectric layer such that the electrically-conductive layer is electrically coupled to the outer conductor;
• joining an electrically-conductive cylinder to distal portion of the electrically-conductive layer;
• and
• forming a dielectric structure disposed substantially adjacent to a distal end of the electrically-conductive cylinder, wherein the dielectric structure longitudinally extends from the distal end of the electrically-conductive cylinder to a distal end of the electrically-conductive member.