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master's thesis
Apsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja
2020. urn:nbn:hr:200:250950
Varga, Maja
Josip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Department of Communications
Laboratory for High Frequency Measurements

Cite this document

Varga, M. (2020). Apsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja (Master's thesis). Retrieved from https://urn.nsk.hr/urn:nbn:hr:200:250950

Varga, Maja. "Apsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja." Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, 2020. https://urn.nsk.hr/urn:nbn:hr:200:250950

Varga, Maja. "Apsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja." Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, 2020. https://urn.nsk.hr/urn:nbn:hr:200:250950

Varga, M. (2020). 'Apsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja', Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, accessed 22 July 2021, https://urn.nsk.hr/urn:nbn:hr:200:250950

Varga M. Apsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek; 2020 [cited 2021 July 22] Available at: https://urn.nsk.hr/urn:nbn:hr:200:250950

M. Varga, "Apsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja", Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, Osijek, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:200:250950

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Metadata
TitleApsorberi EM zračenja zasnovani na biopodlogama - izvedba i mjerenja
Title (english)EM radiation absorbers based on BIO substrates - production and measurements
AuthorMaja Varga
MentorSlavko Rupčić (mentor)
Committee memberSlavko Rupčić (predsjednik povjerenstva)
Committee memberVanja Mandrić Radivojević (član povjerenstva)
Committee memberAnđelko Lišnjić (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
(Department of Communications)
(Laboratory for High Frequency Measurements)
Osijek
Defense date and country2020-09-21, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Radio Communications
Abstract
Predmet ovoga rada su apsorberi elektromagnetskog (EM) zračenja zasnovani na biopodlogama. Zadatak je bio utvrditi kako se različiti biomaterijali (soja, pšenica, djetelina) ponašaju u ulozi aspsorbera EM zračenja na način da se izravno mjere gubici pri zračenju kroz njih u frekvencijskom opsegu od 300 kHz do 5 GHz, tj. parametra S21. Za tu je svrhu konstruiran mjerni postav koji se sastojao od dvije Vivaldi antene, prilagodljivog kućišta s biomaterijalom, digitalne vage i radiofrekvencijskog mjernog uređaja za analizu spektra, a mjerenja su provedena u laboratoriju za mjerenje jakosti visokofrekvencijskih elektromagnetskih polja. Rezultati su pokazali da debljina biomaterijala proporcionalno utječe na veličinu apsorpcije EM zračenja, pri čemu je djetelina najbolji apsorber kod debljine od 10 cm (S21= -27.97 dB), a kod 20 cm i 30 cm je to soja (S21=-30.45 dB/-30.20 dB). Osim toga, veća vlažnost materijala uzrokuje veću apsorpciju EM zračenja, pri čemu se najboljim apsorberom pokazala soja (S21= -35.52 dB vlažnosti 0.088 l/kg, odnosno djetelina vlažnosti 0.175 l/kg/0.526 l/kg (S21=-39.23 dB/-64.43 dB).
Abstract (english)
The study explores bio-materials as the absorbers of electromagnetic (EM) radiation. The aim was to determine how different plants (soybean, wheat, lucerne) behave in the role of RF absorbers by directly measuring radiation losses when exposing them to frequency ranging from 300 kHz to 5 GHz, ie the parameter S21. For that purpose, an experimental setup for laboratory measurements was constructed and it consisted of two Vivaldi antennas, a adaptable enclosed case with biomaterial, a digital scale and an RF spectrum analyser. The measurements were performed in a laboratory designed for measuring the high-frequency electric-field strengths. The results suggest that the thickness of the biomaterial proportionally affects the magnitude of EM radiation absorption, with lucerne being the best absorber at the material thickness of 10 cm (S21= -27.97 dB),. In case of thicker biomaterial (20-30 cm), the soybean is the plant that causes the biggest absorption (S21=-30.45 dB/-30.20 dB). In addition, higher humidity of the material causes higher absorption of EM radiation, with the best absorber being soybean (S21= -35.52 dB), with the addition of 1 l of water), or lucerne (S21=-39.23 dB/-64.43 dB), with the addition of 2 l / 6 l of water)
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:200:250950
Study programmeTitle: Graduate University Study Programme in Electrical Engineering; specializations in: Communications and Informatics, Power Engineering
Course: Communications and Informatics
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike (magistar/magistra inženjer/inženjerka elektrotehnike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-11-20 10:24:48