Dipole Antenna for Interstitial Microwave Heating in a Dissipative medium: A Design Prospective

Interstitial antennas are useful for producing localized power as in the hyperthermia treatment of tumors. Simple analytical forms for the generated electric field, the radiated power, and the input impedance are used in this paper to study the characteristics of a short dipole in a dissipative medium similar to the white matter of the brain tissues for a frequency range from 0.2 to 2 GHz. These analytical forms are found to be a fast efficient technique for designing a small dipole antenna that can be used to produce a concentrated power around the antenna that can be used to produce localized regional heating for hyperthermia treatment of brain tumors. It is found that a dipole whose length and radius are nearly 7 mm and 0.3 mm respectively operating at nearly 400 MHz is quite suitable to produce the required localized power. Also FDTD method is used to verify the validity of these analytical forms