#$%^&*AU2014200879A120140313.pdf#####MICROWAVE ANTENNA ASSEMBLY HAVING A DIELECTRIC BODY PORTION WITH RADIAL PARTITIONS OF DIELECTRIC MATERIAL Abstract A electrosurgical system (100) for treating tissue. The system comprising an electrosurgical generator (102) configured to generate microwave energy and an antenna assembly (300) configured to radiate the microwave energy. The antenna assembly comprising: a first elongated conductor (302) associated with a first radiating portion at least partially along the length thereof. A second elongated conductor (304) disposed within the first elongated conductor and associated with a second radiating portion at least partially along the length thereof. A dielectric body portion (318) disposed along the length of at least one of the first elongated conductor and the second elongated conductor, the dielectric body portion including at least two radial partitions of dielectric material having different dielectric constants.
