Array of Slot-Sleeve Antennas for Hyperthermia Therapy

  • Park Soo-Man (School of Electronics & Computer Eng., Chonnam National University) ;
  • Lim Yeongseog (School of Electronics & Computer Eng., Chonnam National University)
  • Published : 2005.09.01


To increase the efficiency of an applicator during microwave hyperthermia therapy, first, the length from the antenna end to a slot is varied to get the optimal matching of the characteristic impedance at the frequency of 2.45 GHz. Using the electric and thermal constants of biological tissue, we compose a phantom to calculate temperature increment as well as the resonance characteristics and the SAR distributions. The proposed 3-slot sleeve antenna inserted in an applicator plays an effective role in increasing the therapy size in the view of heating performance as electromagnetic energy tends to concentrate on not feed point direction but treatment area. The SAR is then used in combination with a finite difference heat transfer equation to determine the temperature distribution. Also, in order to shorten treatment time and increase therapy size, a square-array structure is suggested and analyzed.



  1. C. H. Durney, M. F. Iskander, Antenna Handbook in Antennas for Medical Applications, New York: Van Nostrand, ch. 24, 1988
  2. A. Rosen, M. A. Stuchly, and A. V. Vorst, 'Applications of RF/microwaves in medicine', IEEE Trans. Microwave Theory Tech., vol. 50, pp. 963-974, Mar. 2002
  3. A. Winter, J. Laing, R. Paglione, and F. Sterzer, 'Microwave hyperthermia for brain tumors', Neurosurgery, vol. 17, no. 3, pp. 387-399, 1985
  4. American national standard safety levels with respect to exposure to radio frequency electromagnetic fields, 3 kHz to 300 GHz, ANSI/IEEEC 95.1, 1992
  5. R. D. Nevels, G. D. Arndt, G. W. Raffoul, and A. Pacifico, 'Microwave catheter design', IEEE Trans. Biomed. Eng., vol. 45, pp. 885-890, Jul. 1998
  6. H. H. Pennes, 'Analysis of tissue and arterial blood temperatures in the resting human forearm', J. Appl. Phys., vol. 1, pp. 93-102, 1948
  7. K. Saito, S. Hosaka, H. Yoshimura, and K. Ito, 'Localized heating by the coaxial-dipole antenna for microwave coagulation', Antennas, Propagation and EM Theory, Proceeding ISAPE., pp. 406-409, Aug. 2000
  8. K. S. Yee, 'Numerical solution of initial boundary value problems involving Maxwell's equations in isotropic media', IEEE Trans. Antennas Propagation, vol. 14, pp. 302-307, May 1966