Ablation devices with dual operating frequencies, systems including same, and methods of adjusting ablation volume using same

A system, comprising:

• a generator assembly;
• and
• an ablation device operably associated with the generator assembly, the ablation device including:
• a feedline having an inner conductor, an outer conductor coaxially-disposed around the inner conductor, and a dielectric material disposed therebetween;
• a first balun structure operably associated with a first operating frequency, wherein the first balun structure is electrically coupled to the outer conductor;
• and
• a second balun structure operably associated with a second operating frequency, wherein the second balun structure is electrically coupled to the outer conductor.

A method of adjusting ablation volume, comprising the steps of:

• position an ablation device in tissue, the ablation device capable of operating at a first operating frequency and a second operating frequency, the ablation device including an antenna assembly configured with a first balun operably associated with the first operating frequency and a second balun operably associated with the second operating frequency;
• transmitting energy from an energy source through the antenna assembly to tissue at the first operating frequency;
• and
• transmitting energy from the energy source through the antenna assembly to tissue at the second operating frequency.