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master's thesis
Preklopna radiofrekvencijska pojačala s komplementarnim filtrima
Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2019. urn:nbn:hr:168:996007
Brizić, Ante
University of Zagreb
Faculty of Electrical Engineering and Computing

Institutional repository: FER Repository

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Brizić, A. (2019). Preklopna radiofrekvencijska pojačala s komplementarnim filtrima (Master's thesis). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:996007

Brizić, Ante. "Preklopna radiofrekvencijska pojačala s komplementarnim filtrima." Master's thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2019. https://urn.nsk.hr/urn:nbn:hr:168:996007

Brizić, Ante. "Preklopna radiofrekvencijska pojačala s komplementarnim filtrima." Master's thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2019. https://urn.nsk.hr/urn:nbn:hr:168:996007

Brizić, A. (2019). 'Preklopna radiofrekvencijska pojačala s komplementarnim filtrima', Master's thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 03 November 2024, https://urn.nsk.hr/urn:nbn:hr:168:996007

Brizić A. Preklopna radiofrekvencijska pojačala s komplementarnim filtrima [Master's thesis]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2019 [cited 2024 November 03] Available at: https://urn.nsk.hr/urn:nbn:hr:168:996007

A. Brizić, "Preklopna radiofrekvencijska pojačala s komplementarnim filtrima", Master's thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2019. Available at: https://urn.nsk.hr/urn:nbn:hr:168:996007

Metadata
TitlePreklopna radiofrekvencijska pojačala s komplementarnim filtrima
Title (english)Switchmode radiofrequency amplifiers with complimentary filters
AuthorAnte Brizić
MentorDubravko Babić (mentor)
Committee memberDubravko Babić (predsjednik povjerenstva)
Committee memberSilvio Hrabar (član povjerenstva)
Committee memberMarko Bosiljevac (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Electrical Engineering and Computing
Zagreb
Defense date and country2019-07-02, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Computing
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Abstract
Ovaj rad uvodi novi pristup pri korištenju konstantnih otporničkih mreža, pobliže komplementarnih filtara u konfiguraciji dipleksera, na izlazu radiofrekvencijskih preklopnih modulatora. Dana su teorijska razmatranja i dizajn filtara te mjerenja napravljenih filtara s karakterističnom frekvencijom na 800 MHz i 2.5 GHz. Zaljučeno je da preklopna pojacala zaključena s komplementarnim filtrima imaju veću i stabilniju efikasnost nego kada su zaključena samo s nisko-propusnim filtrom. Iako povećavaju korisnost, proizvodnja ovakvih filtara predstavlja kompliciraniji postupak naspram korištenih nisko-propusnih filtara, iz razloga što s11 parametar, za koji želimo da bude što manji moguć, ovisi o faznom neslaganju između nisko-propusne i visoko-propusne sekcije, te u slučaju većeg neslaganja opada, pri čemu performanse pojačala i filtra također opadaju. Kao kvalitativna metoda za evaluaciju filtara koristi se reflektometrija u vremenskoj domeni. Korištenjem simulacija i mjerenja putem reflektometrije potvrđeno je da diskontinuiteti nastaju zbog faznog neslaganja između dviju filtarskih sekcija te je aproksimiran ekvivalentni iznos diskontinuiteta.
Abstract (english)
This work introduces a novel approach in using constant resistance networks, specially complementary filters in a diplexer configuration, on the output of a radio-frequency switch-mode modulator. Theory concepts and design for the filters, with a crossover frequency of 800 MHz and 2.5GHz, are considered and the filters were assembled and measured. Based on the measurements and simulations we concluded that switchmode RF power amplifiers terminated with complementary filters exhibit higher and more consistent drain efficiency than when terminated with only a low-pass filter. Despite increasing and stabilizing the drain efficiency, the filters present a slightly more stringent assembly procedure in comparison to the widely used low-pass filters due to the fact that the s11 parameter, which we want to be minimal as possible, falls off due to phase mismatch between the low-pass and high-pass section. We used time domain reflectometry(TDR) to evaluate the quality of the filter’s assembly. Using TDR simulations and measurements we identified the discontinuities that lower the performance of the complementary filters.
Keywords
Keywords (english)
Languageenglish
URN:NBNurn:nbn:hr:168:996007
Study programmeTitle: 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 resourceText
File originBorn digital
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Created on2020-01-07 17:02:46