Samooscilirajući antenski sustav temeljen na negativnom i pozitivnom pretvorniku imitancije

master's thesis

• Title (english): Self-oscillating antenna system based on negative and positive immittance converter
• Author: Ivan Bašić
• Mentor: Silvio Hrabar (mentor)
• Committee member: Silvio Hrabar (predsjednik povjerenstva)
• Committee member: Zvonimir Šipuš (član povjerenstva)
• Committee member: Igor Krois (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2020-09-14, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering

Abstract

U ovom diplomskom radu dan je uvod u metamaterijale i negativne pasivne reaktivne elemente strujnog kruga: kondenzator i zavojnicu. Iznesena je ideja kako generirati navedene negativne elemente pomoću „negativnog konvertera impedancija“ (engl. NIC), te kako iskoristiti negativni kondenzator u svrhu rješavanja poznatog problema prilagođenja antene, i u svrhu izrade samooscilirajućeg antenskog sustava. Zatim je iznesena ideja kako kompenzirati pogrešku pretvorbe NIC-a pomoću novopredloženog elektroničkog sklopa – „pozitivnog konvertera impedancija“ (engl. PIC). Napravljen je matematički model stvarnog operacijskog pojačala THS4304 te je dana usporedba matematičkog modela i SPICE modela pojačala, NIC-a i PIC-a. Opisan je način optimizacije samooscilirajućeg antenskog sustava u NIC-PIC konfiguraciji, te je antenski sustav simuliran u ADS-u u tri različite konfiguracije: samo NIC, NIC-PIC, te optimizirani NIC-PIC. Na kraju je dana usporedba ponašanja sve tri konfiguracije.

Abstract (english)

In this master thesis, metamaterials were introduced, as well as negative, passive, reactive components of electric circuits - capacitors and inductors. An idea was introduced on how to generate the beforementioned negative elements by using a „Negative Impedance Converter“ (NIC), and how one should utilize the negative capacitor to solve a well-known problem of antenna matching, and to build a self-oscillating antenna system. Furthermore, an idea on how to compensate a NIC conversion error using the newly proposed „Positive Impedance Converter“ (PIC), was given. A mathematical model of a real op-amp THS4304 was developed. Then, mathematical model was compared with a SPICE model of both op-amp, NIC and PIC. Optimization procedure of the self-oscilatting antenna system in NIC-PIC configuration was described, and the antenna system was simulated in ADS, using three different configurations – NIC only, NIC and PIC, optimized NIC and PIC. To conclude, behaviour of all three configurations was compared.

• Keywords: negativni kapacitet; negativni konverter impedancija; NIC; pozitivni konverter impedancija; PIC; optimizacija
• Keywords (english): negative capacitor; Negative Impedance Converter; NIC; Positive Impedance Converter; PIC; optimization
• Language: croatian
• URN:NBN: urn:nbn:hr:168:805769
• Study programme: Title: Information and Communication Technology; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije (magistar/magistra inženjer/inženjerka informacijske i komunikacijske tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2025-02-25 12:51:10