Small Antennas for Medical Applications

Various types of medical applications of antennas have widely been investigated. Since these antennas are used in and around a human body, the size of the antennas must be small. Particularly, in order to realize minimally invasive treatment, small-size antennas are desired. This paper describes a few antennas for hyperthermia which is one of thermal therapies for cancer. The authors et al. have developed a coaxial-slot antenna, which is one of thin microwave antennas to be employed for interstitial as well as intracavitary microwave hyperthermia. Two different types of coaxial-slot antennas are then introduced for the treatment of brain tumor and bile duct carcinoma.