Mikrotalasni planarni filtri realizovani pomoću rezonatora sa više rezonantnih učestanosti
Microwave planar filters with multi-mode resonators
Doktorand
Plazinić, AnaMentor
Potrebić, MilkaČlanovi komisije
Kolundžija, BrankoŽivanić, Jeroslav
Milovanović, Alenka
Cvetković, Zlata
Metapodaci
Prikaz svih podataka o disertacijiSažetak
REZIME:
Predmet istraživanja ove doktorske disertacije su mikrotalasni filtri propusnici
opsega učestanosti, realizovani pomoću rezonatora sa više rezonantnih učestanosti, koji
su implementirani u planarnoj štampanoj tehnici. S obzirom na stalan razvoj bežičnih
tehnologija, kao što je peta generacija mobilnih mreža, postavljaju se zahtevi za
projektovanje mikrotalasnih komponenti za šire propusne opsege, na višim učestanostima,
čime bi se osvario brži prenos podataka, veći kapacitet mreže i bolja energetska
efikasnost. Mikrotalasni filtri, kao deo nove tehnologije pete generacije mobilnih
sistema, predstavljaju pravi izazov za projektante, o čemu svedoče brojne objavljene
publikacije. Shodno sve strožijim specifikacijama tehnologije u razvoju, nameće se
potreba za novim realizacijama mikrotalasnih filtara željenih performansi.
U cilju zadovoljenja zahteva kao što su novi frekvecijski opsezi, širina kanala,
primopredajnici sa više opsega, rekonfigurabilnost primopredajnika, ...minijaturizacija
prenosivih uređaja uz uslov da ne dođe do neželjene sprege delova sitema, ostavlja se prostor
za dalja istraživanja u oblasti projektovanja kako rezonatora, tako i filtara na
mikrotalasnim učestanostima.
Da bi se zadovoljili navedeni kriterijumi nove tehnologije, u okviru disertacije
ispituje se nov način realizacije rezonatora sa dve ili tri rezonantne učestanosti. Razmatra
se štampanje rezonatora u više slojeva planarne strukture u cilju smanjenja zauzeća
štampane pločice. Korišćenje višeslojane strukture doprinosi minijaturizaciji sa jedne
strane samog rezonatora, a sa druge strane celog filtra, uz težnju da se očuva ili poboljša
karakteristika filtra. U razmatranom istraživanju, višeslojna realizacija je ostvarena
spajanjem dve mikrotrakaste strukture masama, čime se masa postavlja u centar strukture.
Predloženi rezonatori koriste se za projektovanje nove klase planarnih filtara koji
imaju jedan ili više propusnih opsega. Za svaki propusni opseg filtra koristi se po jedan
rezonator, a sprega između susednih opsega je izbegnuta ostavljanjem potrebnog rastojanja na
štampanoj pločici. Osnovni cilj nove realizacije filtra je mogućnost nezavisnog
vi
podešavanja svakog od opsega. Shodno tome, ispitituje se optimalno rastojanja između
rezonatora za različite propusne opsege.
ABSTRACT:
The scope of the research, presented in this doctoral dissertation, is the microwave bandpass
filter design using multi-mode resonators implemented in planar technology. Due to the constant
development of wireless technologies, such as the fifth generation of mobile networks, requirements
for the microwave components design for wider pass bands are set up for higher frequencies, thereby
securing faster data transfer, greater network capacity and better energy efficiency. As evidenced in
numerous publications, microwave filters, as a part of the new technology of the fifth generation of
mobile systems, present a real challenge for designers. In accordance with increasingly stringent
technology specifications in development, the need for new microwave filter realizations of desired
performance is imposed.
In order to meet requirements such as new frequency bands, channel bandwidth, multi-band
transceivers, reconfigurable transceivers, portable devices miniaturization... without unwanted
coupling between the parts of the system, a space for further resonators and filters design research
remains.
In order to satisfy the stated new technology criteria, in the framework of this dissertation, a
new method of the resonator realization with two or three resonant frequencies is examined. In order
to reduce the printed circuit area occupation, resonators printed in several layers of the planar structure
are considered. The use of multilayer structure contributes to resonator miniaturization on one side,
as well as for the entire filter, while preserving or improving the filter characteristics. In this study,
the multilayer realization was achieved by combining two microstrip structures which are connected
by a common ground, which is placed in the center of the structure.
The proposed resonators are used for a new class of planar filters design with one or more
pass bands. One resonator is used for each pass band of the filter, and the coupling between the
adjacent pass bands is avoided by leaving the required distance on the printed circuit area. The main
aim of the new filter realization is the possibility to independently tune each of the pass bands.
Consequently, optimal distances between the resonators for different pass bands are examined.
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Due to the geometric complexity of the proposed filters, the analysis was performed in threedimensional electromagnetic software. For more efficient filter characteristics examination and for
reducing the time needed for the analysis, equivalent circuits of the resonators and filters are
proposed. The introduced equivalent circuits allow analysis of changing individual filter parameters
on its frequency characteristics, almost instantaneously. Using the equivalent circuits significantly
reduces the time required for filter design, since it allows the optimization of filter parameters at the
microwave circuit level.