Ing. Michaela Nečasová

This article presents the design and experimental evaluation of a single helical interstitial applicator for localised microwave hyperthermia treatment. The applicator operates at a frequency of 2.45 GHz and is intended to treat small tumours with a 2–3 cm diameter located under the skin. The study includes numerical simulations in Sim4Life focusing on the distribution of the specific absorption rate (SAR) and the reflection coefficient |s11|. The designed applicator was manufactured and tested using an agar phantom with dielectric and thermal properties similar to human muscle tissue. Experimental results confirm efficient energy delivery with a measured reflection coefficient of −46.5 dB and a controlled thermal response. This research supports the potential of single-antenna hyperthermia for interstitial cancer treatment. At the same time, the optimised applicator can be used in the design of a more complex hyperthermia system.

This study aims to design and experimentally validate new types of microwave applicators suitable for the treatment of cardiac arrhythmias. Two types of applicators were designed, fabricated and tested on an agar phantom of muscle tissue. Optimization of shape and dimensions was based on numerical simulations employing the finite element method implemented in Sim4Life software. The results show that the proposed applicators are suitable to be used in the treatment of cardiac arrhythmias, both in terms of efficiency and ability to create the desired shape of ablation zone.

This article presents the design and implementation of a regional hyperthermia applicator based on an array of eight Bow-tie antennas. The device, developed and simulated in Sim4Life at 434 MHz, is optimized for reflection coefficient and SAR distribution to support effective treatment. Its performance is verified experimentally using a tissue-mimicking phantom and infrared thermography.