Affiliations: [a] Department of Measurement and Applied Electrical
Engineering, Faculty of Electrical Engineering, University of Žilina,
Univerzitná, Žilina, Slovak Republic | [b] Continental Matador Rubber, Ltd. T. Vansovej,
Púchov, Slovak Republic | Université Laval, Canada | Tohoku University, Japan
Correspondence:
[*]
Corresponding author: Dagmar Faktorová, Department of
Measurement and Applied Electrical Engineering, Faculty of Electrical
Engineering, University of Žilina, Univerzitná 1010 26
Žilina, Slovak Republic. E-mail: dagmar.faktorova@fel.uniza.sk
Abstract: The paper presents some optimization approaches to the
electromagnetic wave focusing in heterogeneous biological tissue model. The
model of human arm was used for investigation. The possibility of focusing of
electromagnetic wave optimisation is strongly connected with investigation of
electromagnetic wave propagation through complicated heterogeneous biological
structure. Firstly we concentrated on the influence of particular structures
thickness on scattering parameters value which gives us information about
transmission and reflection of electromagnetic wave on interfaces of structures
which differ by dielectric parameters. The next simulation showed the influence
of water bolus placed on the arm model surface on values of SAR and
consequently the possibility to avoid the overheating of upper region of arm
model in the process of microwave hyperthermia. The next step connected with
possible optimisation of electromagnetic wave focusing showed the influence of
metamaterial structure placed in the front of microwave patch antenna used in
role of microwave hyperthermia applicator on the electromagnetic wave focusing.
The simulations were done for various numbers of metamaterial structures and
various distances from arm model. Finally we simulated the focusing accuracy in
the case when the combination of water bolus with metamaterial structure was
used.
Keywords: Human arm model, metamaterial structure, microwave applicator, specific absorption rate, water bolus
