An elongate applicator body for use with a microwave applicator, the elongate applicator body comprising: a tip portion including a tip elongate portion; a first dielectric isolator having a first dielectric width and a longitudinal lumen, L DI; a first cylindrical shunt; a second cylindrical dielectric isolator having a second dielectric width, L D2; a second cylindrical shunt; a third cylindrical dielectric isolator having a third dielectric width, L D3; and a microwave transmission line; characterized in that: the first dielectric isolator comprises a first cylindrical portion with a first isolator first diameter, and an elongated second cylindrical portion with a first isolator second diameter that is less than the first isolator first diameter; the first cylindrical shunt, the second cylindrical dielectric isolator, the second cylindrical shunt and the third cylindrical dielectric isolator are disposed on the elongated second cylindrical portion of the first dielectric isolator; at least a portion of the tip elongate portion is disposed within the longitudinal lumen of the first dielectric isolator; at least a portion of the microwave transmission line is also disposed within a portion of the longitudinal lumen of the first dielectric isolator; and an inner conductor of the microwave transmission line is received within an end of the tip elongate portion. a tip portion including a tip elongate portion; a first dielectric isolator having a first dielectric width and a longitudinal lumen, L DI; a first cylindrical shunt; a second cylindrical dielectric isolator having a second dielectric width, L D2; a second cylindrical shunt; a third cylindrical dielectric isolator having a third dielectric width, L D3; and a microwave transmission line; characterized in that: the first dielectric isolator comprises a first cylindrical portion with a first isolator first diameter, and an elongated second cylindrical portion with a first isolator second diameter that is less than the first isolator first diameter; the first cylindrical shunt, the second cylindrical dielectric isolator, the second cylindrical shunt and the third cylindrical dielectric isolator are disposed on the elongated second cylindrical portion of the first dielectric isolator; at least a portion of the tip elongate portion is disposed within the longitudinal lumen of the first dielectric isolator; at least a portion of the microwave transmission line is also disposed within a portion of the longitudinal lumen of the first dielectric isolator; and an inner conductor of the microwave transmission line is received within an end of the tip elongate portion. the first dielectric isolator comprises a first cylindrical portion with a first isolator first diameter, and an elongated second cylindrical portion with a first isolator second diameter that is less than the first isolator first diameter; the first cylindrical shunt, the second cylindrical dielectric isolator, the second cylindrical shunt and the third cylindrical dielectric isolator are disposed on the elongated second cylindrical portion of the first dielectric isolator; at least a portion of the tip elongate portion is disposed within the longitudinal lumen of the first dielectric isolator; at least a portion of the microwave transmission line is also disposed within a portion of the longitudinal lumen of the first dielectric isolator; and an inner conductor of the microwave transmission line is received within an end of the tip elongate portion.