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Abstract
This paper describes an analysis of the coaxial-slot antenna, which is an effective antenna for interstitial microwave hyperthermia. The structure of a coaxial-slot antenna for analysis is described. The antenna is modeled as a vertical antenna penetrating the interface between the air and a lossy medium. In this analysis, the full-wave spatial Green's function is approximated by an exponential polynomial, and a catheter around the antenna is replaced with an equivalent polarization current. An electric current distribution along the antenna is calculated by using the moment method and an electric field distribution around the antenna is derived from the current distribution. We present the results of our calculations and discuss the effect of the antenna insertion depth on both the current and electric field distributions.