Lujambio Genua, Aintzane

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https://academica-e.unavarra.es/handle/2454/49470

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Lujambio Genua

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Aintzane

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Ingeniería Eléctrica y Electrónica

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1174233

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9131

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2013 - 20142
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    PublicationOpen Access
    Passive microwave component design using inverse scattering: theory and applications
    (Hindawi, 2013) Arnedo Gil, Israel; Arregui Padilla, Iván; Chudzik, Magdalena; Teberio Berdún, Fernando; Lujambio Genua, Aintzane; Benito Pertusa, David; Lopetegui Beregaña, José María; Gómez Laso, Miguel Ángel; Ingeniería Eléctrica y Electrónica; Ingeniaritza Elektrikoa eta Elektronikoa
    We briefly review different synthesis techniques for the design of passive microwave components with arbitrary frequency response, developed by our group during the last decade. We provide the theoretical foundations based on inverse scattering and coupledmode theory as well as several applications where the devices designed following those techniques have been successfully tested. The main characteristics of these synthesis methods are as follows. (a) They are direct, because it is not necessary to use lumpedelement circuit models; just the target frequency response is the starting point. (b)They are exact, as there is neither spurious bands nor degradation in the frequency response; hence, there is no bandwidth limitation. (c) They are flexible, because they are valid for any causal, stable, and passive transfer function; only inviolable physical principles must be guaranteed. A myriad of examples has been presented by our group in many different technologies for very relevant applications such as harmonic control of amplifiers, directional couplerwith enhanced directivity and coupling, transmission-type dispersive delay lines for phase engineering, compact design of high-power spurious free low-pass waveguide filters for satellite payloads, pulse shapers for advanced UWB radar and communications and for novel breast cancer detection systems, transmission-type Nth-order differentiators for tunable pulse generation, and a robust filter design tool.
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    PublicationOpen Access
    Frequency responses and synthesis methods for advanced microwave applications
    (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.