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An electrosurgical device for directing energy to a target volume of tissue includes a coaxial feedline having an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a dielectric material disposed therebetween. An elongated electrically-conductive member is longitu

An electrosurgical device for directing energy to a target volume of tissue includes a coaxial feedline having an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a dielectric material disposed therebetween. An elongated electrically-conductive member is longitudinally disposed at a distal end of the inner conductor; a balun structure is disposed on the outer conductor. An electrically-conductive cylinder is coaxially disposed around a distal portion of the balun structure and a dielectric structure is disposed substantially adjacent to a distal end of the electrically-conductive cylinder and configured to extend to a distal end of the electrically-conductive member. An elongated handle assembly is coaxially disposed around a portion of the outer conductor proximal to the dielectric structure and a shell assembly is disposed at a distal end of the elongated handle assembly. A portion of the shell assembly is configured to extend distally beyond the distal end of the electrically-conductive member.

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1. An electrosurgical device for directing energy to a target volume of tissue, comprising: a coaxial feedline having an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a dielectric material disposed therebetween;an elongated electrically-conductive member long

1. An electrosurgical device for directing energy to a target volume of tissue, comprising: a coaxial feedline having an inner conductor, an outer conductor coaxially disposed around the inner conductor, and a dielectric material disposed therebetween;an elongated electrically-conductive member longitudinally disposed at a distal end of the inner conductor;a balun including: a dielectric layer coaxially disposed around a distal portion of the outer conductor; andan electrically-conductive layer coaxially disposed around a proximal portion of the dielectric layer;an electrically-conductive cylinder coaxially disposed around a distal portion of the electrically-conductive layer of the balun;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;an elongated handle assembly coaxially disposed around a portion of the outer conductor at a distal end of the coaxial feedline, wherein the handle assembly is disposed proximal to the dielectric structure; anda shell assembly disposed at a distal end of the elongated handle assembly, wherein the shell assembly is coupled to a distal portion of the balun. 2. The electrosurgical device of claim 1, wherein a portion of the inner conductor and the dielectric material of the coaxial feedline extends beyond the outer conductor at a distal end of the coaxial feedline. 3. The electrosurgical device of claim 1, wherein the electrically-conductive member is electrically coupled to the inner conductor. 4. The electrosurgical device of claim 1, wherein the balun is a quarter wavelength sleeve. 5. The electrosurgical device of claim 1, wherein the electrically-conductive layer includes a first portion coaxially disposed around the proximal portion of the dielectric layer, and a second portion disposed proximally to the first portion, the second portion electrically coupled to the outer conductor. 6. The electrosurgical device of claim 1, wherein the dielectric structure is configured to cover a distal end of the electrically-conductive member. 7. The electrosurgical device of claim 1, further comprising: a cooling chamber disposed at least partially about the electrically-conductive member. 8. The electrosurgical device of claim 7, further comprising: an inflow tube configured to supply a coolant fluid into the cooling chamber; andan outflow tube configured to dispense the coolant fluid from the cooling chamber. 9. The electrosurgical device of claim 8, further comprising: a coolant source to supply the coolant fluid. 10. The electrosurgical device of claim 1, wherein the shell assembly is coupled to a distal end of the electrically-conductive layer of the balun. 11. The electrosurgical device of claim 1, wherein the dielectric layer of the balun extends distally beyond a distal end of the electrically-conductive layer of the balun. 12. 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;joining a balun to a distal portion of the outer conductor, the balun including a dielectric layer coaxially disposed around the distal portion of the outer conductor and an electrically-conductive layer coaxially disposed around a proximal portion of the dielectric layer;joining an electrically-conductive cylinder to a distal portion of the electrically-conductive layer of the balun;forming a dielectric structure having a proximal end 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;joining an elongated handle assembly to the outer conductor at a distal end of the coaxial feedline, wherein the handle assembly is disposed proximal to the dielectric structure; andjoining a shell assembly to a distal end of the elongated handle assembly, wherein the shell assembly is coupled to a distal portion of the balun. 13. The method of manufacturing an electrosurgical device in accordance with claim 12, wherein the dielectric structure includes a cap of dielectric material configured to cover a distal end of the electrically-conductive member. 14. The method of manufacturing an electrosurgical device in accordance with claim 12, wherein the shell assembly includes an inner portion and an outer portion disposed about the inner portion. 15. The method of manufacturing an electrosurgical device in accordance with claim 14, wherein the outer portion of the shell assembly includes an electrically conductive material and the inner portion of the shell assembly includes a dielectric material. 16. The method of manufacturing an electrosurgical device in accordance with claim 14, wherein the inner portion of the shell assembly includes a flat planar surface having a recess defined therein. 17. The method of manufacturing an electrosurgical device in accordance with claim 16, wherein the recess is configured to receive at least a portion of the dielectric structure. 18. The method of manufacturing an electrosurgical device of claim 12, wherein the shell assembly is coupled to a distal end of the electrically-conductive layer of the balun. 19. The method of manufacturing an electrosurgical device of claim 12, wherein the dielectric layer of the balun extends distally beyond a distal end of the electrically-conductive layer of the balun.