This paper presents a new preclinical
microwave hyperthermia system based on the combination
among horn antenna and convex lenses. The horn antenna is
designed to resonate at 3 GHz which is reported for
hyperthermia therapy. Two convex lenses are designed and
incorporated with the designed horn antenna and the
reported breast phantom. The proposed system aims to heat
up the tumor region above 42oC while keeping the
surrounding area temperature unchanged as possible to
protect them from damage. Specific Absorption Rate (SAR)
and breast phantom thermal distribution are studied with
and without using lenses at different inclination angles. The
proposed system has the advantage of heating up different
zones separately while keeping other regions temperature
unchanged. Simulation results show that, the breast
temperature can be elevated by 10o C above the normal body
temperature.