#$%^&*AU2014202676B220150507.pdf#####DIRECTIVE WINDOW ABLATION ANTENNA WITH DIELECTRIC LOADING Abstract An electrosurgical device for directing energy to a target volume of tissue, comprising: a coaxial feedline (226) having an inner conductor (220), an outer conductor (224) coaxially disposed around the inner conductor, and a dielectric material (222) disposed therebetween. An elongated electrically-conductive member (270) longitudinally disposed at a distal end of the inner conductor. A balun (320) disposed in association with the outer conductor. An electrically-conductive cylinder (540) coaxially disposed around a distal portion of the balun. A dielectric structure (850) disposed substantially adjacent to a distal end of the electricallyconductive cylinder. The dielectric structure longitudinally extends from the distal end of the electrically-conductive cylinder to a distal end of the electrically-conductive member.
