(2014) Lujambio Genua, Aintzane; Lopetegui Beregaña, José María; Gómez Laso, Miguel Ángel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
In this thesis, a new approximation procedure based on digital filter design techniques
and a direct synthesismethod based on inverse scattering are proposed to provide
flexibility to themicrowave filter design process. The combination of bothmethods
has been used for the design, fabrication, and measurement of a multiband filter.
Further modifications have been done in the design to improve its integration using
the latest Low Temperature Cofired Ceramics (LTCC)multilayer technology.
Different type of rectangular waveguide filters with smooth profiles have been presented
that provide wideband rejection, high power handling capability and higher
order mode suppression, typical specifications of satellite communication systems.
The analysis of the proposed devices makes special emphasis on multi-mode effects,
which are analyzed using a home-made mode-matching program that allows to obtain
the evolution of themodes and the coupling between theminside the structure.
Finally, dispersive delay lines (DDLs), the basic elements of analog signal processing
systems, have been considered in detail. After a review of the state of the art, a
new method to design chirped delay lines (CDLs) in coupled-lines is proposed and
validated by the design, fabrication, and measurement of a device aimed for Ultra
Wideband signal processing. In addition, several CDLs in coupled lines are designed
to compensate the chromatic dispersion of optical communication systems obtaining
very good results for relatively short optical links.
