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International Journal of Antennas and Propagation
Volume 2013, Article ID 954986, 6 pages
Research Article

A Compact Microstrip Spiral Antenna Embedded in Water Bolus for Hyperthermia Applications

Department of Electrical and Electronics Engineering, Fatih University, Istanbul 34500, Turkey

Received 20 December 2012; Revised 7 March 2013; Accepted 17 March 2013

Academic Editor: P. Mohanan

Copyright © 2013 Erdal Korkmaz et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents the design, simulation, fabrication, and measurement of a circular spiral microstrip antenna embedded in distilled water bolus. The antenna is mainly designed to operate at 434 MHz ISM band to be used for a hyperthermia applicator. The performance of the antenna is compared to a conventional patch antenna also embedded in water bolus. The results show that spiral antenna has significant narrower radiation pattern and is capable to operate at multiple frequencies as well. Narrow beam of the antenna is desired to design a multiantenna arrangement with less coupling and a better focusing resolution which can be crucial for deep regional hyperthermia applications. The option of other frequencies is desirable to have a better control over the penetration depth versus focusing depending on the application region.