A medical treatment system includes an antenna for radiating energy from a
source of electromagnetic energy and including a first radiating element
and a second radiating element having a conductor helically wound and
coaxially positioned around the first radiating element to receive energy
radiated by the first radiating element. The first and second radiating
elements are positioned substantially along a longitudinal axis of the
antenna with the first radiating element having a proximal end coupled to
the source of electromagnetic energy. With this arrangement, energy from
the electromagnetic source is efficiently conveyed from the first
radiating element and then resonates the coaxially positioned and
helically wound second radiating element.
