Abstract
A flexible and dual-frequency microstrip applicator for microwave local hyperthermia is described. It is designed on conformal liquid crystal polymer (LCP) substrate and operating at ISM (Industrial, Scientific and Medical) frequencies of 915 MHz and 2.45 GHz. To conform the body’s curvature, the applicator is bent on a cylindrical body. 3D electromagnetic CST Microwave Studio was used to determine the performance of the applicator and to evaluate the specific absorption rate (SAR) distribution in cylindrical human body phantom. The results obtained show that the antenna can be used in curved situation for uniform and superficial treatment.
Highlights
Hyperthermia is the name given to one of the medical treatments for cancer to heat tumors up to therapeutic temperatures (43–45◦C) without overheating the surrounding normal tissue
To conform the body’s curvature, the applicator is bent on a cylindrical body. 3D electromagnetic CST Microwave Studio was used to determine the performance of the applicator and to evaluate the specific absorption rate (SAR) distribution in cylindrical human body phantom
There are many references appearing in the subject of hyperthermia applicator [1,2,3,4,5], but very little work has proposed the design of dual-frequency antennas operating in ISM (Industrial, Scientific, and Medical) band [6]
Summary
Hyperthermia is the name given to one of the medical treatments for cancer to heat tumors up to therapeutic temperatures (43–45◦C) without overheating the surrounding normal tissue. We designed two single patch rectangular applicators for the operating frequencies of 915 MHz and 2.45 GHz, respectively, and associated them on a common ground plane to achieve the dual-frequency operation and design a double-patch multilayer microstrip applicator. To evaluate these designs under clinical situation, the applicators are bent on a cylindrical body shape. By means of the simulation using CST Microwave Studio software based on the finite integration technique (FIT), the antennas were designed and studied. Their performances are determined for curved situation. The last step of the study concerns the SAR (specific absorbed rate) distribution inside the biological tissue and the penetration depth (PD) of the heating
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