Karakterizacija kapacitivnog prijenosa signala ljudskim tijelom na tekućem fantomu ljudskog tijela

master's thesis

• Title (english): Characterization of Capacitive Intrabody Communication on Liquid Human Body Phantom
• Author: Ivana Artić
• Mentor: Željka Lučev Vasić (mentor)
• Committee member: Željka Lučev Vasić (predsjednik povjerenstva)
• Committee member: Mario Cifrek (član povjerenstva)
• Committee member: Hrvoje Džapo (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2023-02-21, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Computing
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

Razvojem IBC sustava pojavila se potreba za mjernim sustavima kojima je moguće što vjerodostojnije izmjeriti prijenosnu karakteristiku komunikacijskog kapacitivnog kanala uz korištenje modela ljudskih tkiva – fantoma. Fantomi omogućuju neinvazivna istraživanja, prilagođena za različite frekvencijske raspone te se podešavanjem dielektričnih parametara, vodljivosti i permitivnosti, mogu oponašati različita biološka tkiva. Iako polukruti, kruti i fantomi životinjskog porijekla mogu prilično dobro oponašati ljudska tkiva, često su zahtjevni za izradu i nepraktični za provedbu mjerenja u kapacitivnim IBC sustavima kod kojih je odašiljač postavljen unutar tijela, a prijamnik na površinu kože. U ovom radu je izrađen tekući fantom mišića za mjerenje kapacitivnog prijenosa signala ljudskim tijelom pomoću kojeg je implementiran mjerni sustav s baterijski napajanim tiskanim pločicama odašiljača i prijamnika. Ispitivanja prijenosne karakteristike sustava su provedena za sedam diskretnih frekvencija koje je generirao odašiljač, dok je prijamnik služio za očitavanje snage primljenog signala. Istraživao se utjecaj položaja i rotacije elektroda unutar fantoma na prijenosnu karakteristiku, korištenje različitih konfiguracija referentnih elektroda kroz koje se zatvara povratni put signala kroz okolinu, kao i načini spajanja odašiljača i prijamnika na mjerne elektrode. Ispitivan je utjecaj različitih frekvencija na snagu primljenog signala te utjecaj galvanske izolacije prijenosnog kanala.

Abstract (english)

As IBC systems continue to evolve, there is increasing interest in measurement systems that can accurately measure the transmission characteristics of the capacitive communication channel on human tissue models - phantoms. Phantoms are used for non-invasive research methods and are often tailored for different frequency ranges. By adjusting the dielectric parameters of the phantom, conductivity and permittivity, various biological tissues can be mimicked. Although semisolid, solid, and animal tissue phantoms can mimic human tissues quite well, they are difficult to fabricate and impractical for performing measurements in capacitive IBC systems where the transmitter is placed inside the body and the receiver is placed on the skin surface. In this thesis, a liquid phantom representing muscle tissue was created and used for the characterization of the capacitive IBC system employing battery-powered transmitter and receiver. The transmission characteristics of the system were tested at seven discrete frequencies generated by the transmitter while the receiver was used to measure the power of the received signal. The effects of the moving and rotating the electrodes within the phantom on the transmission characteristics were investigated, as were the use of different configurations of ground electrodes through which the return signal path closes, and different approaches to connecting the transmitter and receiver to the phantom. The impact of different frequencies on the received signal power and the galvanic isolation of the transmission channel were investigated.

• Keywords: prijenos signala ljudskim tijelom; kapacitivni prijenos signala; tekući fantom mišića
• Keywords (english): intrabody communication; capacitive coupling; muscle tissue liquid phantom
• Language: croatian
• URN:NBN: urn:nbn:hr:168:186151
• Study programme: Title: Electrical Engineering and Information Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije (magistar/magistra inženjer/inženjerka elektrotehnike i informacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2023-07-13 09:52:51