Choked dielectric loaded tip dipole microwave antenna

A microwave antenna assembly comprising:

• a feedline including an inner conductor, an outer conductor and an inner insulator disposed therebetween;
• a radiating portion including an unbalanced dipole antenna having a proximal portion and a distal portion of different lengths and a gap therebetween, the gap disposed off-center of the unbalanced dipole antenna and configured to provide an impedance match between the unbalanced dipole and initial and real part impedance of tissue, wherein the proximal portion includes at least a portion of the inner conductor and the inner insulator and the distal portion includes a conductive member;
• and
• a choke disposed around at least a portion of the feedline, the choke includes an inner dielectric layer and an outer conductive layer, wherein the outer conductive layer is shorted to the outer conductor of the feedline and a distal end of the inner dielectric layer is disposed between a distal end of the outer conductive layer and the gap.

A microwave antenna assembly comprising:

• a feedline including an inner conductor, an outer conductor and an inner insulator disposed therebetween;
• a radiating portion including an unbalanced dipole antenna having a proximal portion and a distal portion that are of different lengths and a gap therebetween, the gap disposed off-center of the unbalanced dipole antenna and configured to provide an impedance match between the unbalanced dipole and initial and real part impedance of tissue, wherein the proximal portion includes at least a portion of the inner conductor and the inner insulator and the distal portion includes a conductive member;
• a choke disposed around at least a portion of the feedline, the choke includes an inner dielectric layer and an outer conductive layer, wherein the outer conductive layer is shorted to the outer conductor of the feedline and the inner dielectric layer extends past the outer conductive layer, wherein a distal end of the inner dielectric layer is disposed between a distal end of the outer conductive layer and the gap;
• a coolant jacket disposed over the feedline defining a proximal chamber around the feedline, the chamber being adapted to circulate dielectric coolant fluid therethrough;
• and
• a solid dielectric loading having central cavity defined therein adapted to fit about the radiating portion, the solid dielectric loading extending from the coolant jacket.