S. V. Turygin - Engineer, Department of Biomedical Technique, Vologodskij State University V. A. Yatskevich - Dr.Sc. (Eng.), Professor, Department of Biomedical Technique, Vologodskij State University. E-mail: vayatske-vich@yandex.ru

The purpose of this paper is to offer the radiator of a spherical form possessing property of a focusing in strong absorbing medium. The radiator is close in its design to a microstrip antenna, differing that plates represent segments of concentric spheres with an air gap between them. The plates are connected in a point of a symmetry by a steel rod which is prolonged beyond the shield and used as a device of fastening. The approximate expressions for resonance sizes of the aerial and for a radiated field are obtained. The basic mode close to a mode originating in a disk microstrip antenna is raised between plates when set-up at resonance: it-s a standing wave with inphase allocation of the surface electric current. Electrodynamic simulation at a frequency of 915 MHz has shown that the offered radiator allows to form a focal spot in absorbing medium that allows to use it in hospital apparatus for a local hyperthermia of a human head.

 

1. Gelvich EH.A., Kramer-Ageev E.A., Mazokhin V.N., Mogilenec N.N. Apparatura dlja odnovremennogo vozdejjstvija ionizirujushhego izluchenija i gipertermii na opukhol // Medicinskaja fizika. 2009. № 3. S. 30-35.
2. Curto S. Antenna development for radio frequency hyperthermia applications // Doctoral Thesis. Dublin Institute of Technology. 2010.
3. Balanic C.A. Antennas for Medical Therapy and Diagnostics / in Modern Antenna Handbook. USA: JohnWiley. 2008. P. 1377-1419.
4. Misezhnikov G.S., Selskijj A.G., SHtejjnshleger V.B. O fokusirujushhikh svojjstvakh aperturnojj antenny v pogloshhajushhejj srede // Radiotekhnika i ehlektronika. 1985. T. 30. № 11. S. 2268.
5. Novruzov I.I. Razrabotka i issledovanie mikrovolnovykh applikatorov dlja teplovojj terapii biologicheskikh tkanejj // Avtoreferat diss. na soiskanie uchenojj stepeni kandidata tekhnicheskikh nauk po specialnosti 05.12.07 - Antenny, SVCH-ustrojjstva i ikh tekhnologii. Saratov: SGTU. 2012.
6. Bobrikhin A.F., Gudkov A.G., Leushin V.JU., Los V.F., Popov V.V., Porokhov I.O., Sidorov I.A. Modelirovanie antenn-applikatorov unificirovannykh antennykh reshetok dlja mnogokanalnykh sistem radiotermokartirovanija // Antenny. 2014. № 2. S. 17-25.
7. Nizamutdinov R.R., Potapova O.V., Sedelnikov JU.E. Fokusirujushhie svojjstva prostranstvenno-raspredelennykh istochnikov volnovykh polejj v sredakh s poterjami // Nelinejjnyjj mir. 2010. № 5. S. 310-315.
8. Turygin S.V., JAckevich V.A. Mikrovolnovyjj applikator dlja nagreva sustavov konechnostejj // Vuzovskaja nauka - regionu: materialy dvenadcatojj Vseros. nauch.-tekhn. konf. (28 fevralja2014 g. VoGU). Vologda. 2014. S. 31-34.
9. Gabriel C. The dielectric properties of biological tissues: II. Measurements in the frequency range 10 Hz to 20 GHz // Physics in Medicine and Biology. 1996. V. 41. P. 2251-2270.
10. Los V.F. Mikropoloskovye i diehlektricheskie rezonatornye antenny. SAPR-modeli: metody matematicheskogo modelirovanija // Antenny. 2002. № 11 (66). S. 3-96.
11. Markov G.T., CHaplin A.F. Vozbuzhdenie ehlektromagnitnykh voln. M.: Radio i svjaz. 1983.
12. Berezovskijj V.A., Kolotkov N.N., Kostjuk P.G. Biofizicheskie kharakteristiki tkanejj cheloveka. Spravochnik. Kiev: Naukovadumka. 1990.
13. Gabriel C. The dielectric properties of biological tissues: I. Literature survey // Physics in Medicine and Biology. 1996. V. 41. P. 2231-2249.
14. Kublanov V.S., Potapova O.V., Sedelnikov JU.G., Syskov A.M. Sovershenstvovanie kharakteristik SVCH-radiotermografov v medicinskikh zadachakh // ZHurnal radioehlektroniki. 2012. № 4.