Microresonator for Microwave Cancer Therapy

This paper presents a numerical analysis on metallic micro/nanoparticles as LC-circuit resonators at microwave frequencies and with strong absorption for cancer therapy. We pushed the LC -structure design to the limit to provide an optimized structure within desired size limits, which can achieve resonance at the frequencies commonly used in interstitial microwave thermal therapies. Moreover, we discovered that the limitation of the microresonator is not the low resonance frequency tradeoff with the small size, but the low Q-value due to insufficient conductivity of materials. This issue can be solved by using multiple-layer-inductor design of LC structures, which could increase the Q-value linearly with the number of inductor layers, but at the cost of fabrication process complexity.