Tesis doctorales DIEC - IEKS Doktoretza tesiak

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Browsing Tesis doctorales DIEC - IEKS Doktoretza tesiak by Author "Arregui Padilla, Iván"

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    PublicationOpen Access
    Microwave and millimeter-wave components aiming for an easy fabrication
    (2023) Sami, Abdul; Gómez Laso, Miguel Ángel; Arregui Padilla, Iván; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektriko eta Elektronikoaren eta Komunikazio Ingeniaritzaren
    This Thesis is intended to develop various novel design techniques to design low-pass and band-pass waveguide filters based on stepped-impedance commensurate lines for various satellite applications. The main objectives of the thesis are to design waveguide filters which are more robust against fabrication errors, with high electrical performance, reduced size and capable of high-power operations. Keeping in mind the objectives of the thesis, the inherent low-pass response of the commensurate line waveguide sections is utilized to design a low-pass filter with meandered topology employing E-plane mitered bends with constant widths to achieve a very compact design for Ku-band but with large mechanical gaps to make the filter design capable for high power operations. The high-power handling capabilities are demonstrated with SPARK3D at various frequencies between 10.7 GHz to 11.7 GHz in the passband in the pass-band. The estimated minimum input threshold power is 20 kW at the highest frequency of the passband. Also, the critical areas inside the filter structures are also identified which are considered to be more prone to multipactor discharge to identify the key design parameters for enhancing the power handling capabilities.
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    PublicationEmbargo
    Robust design methods and technologies for millimeter-wave components
    (2024) Santiago Arriazu, David; Gómez Laso, Miguel Ángel; Arregui Padilla, Iván; Ingeniería Eléctrica, Electrónica y de Comunicación; Ingeniaritza Elektrikoa, Elektronikoa eta Telekomunikazio Ingeniaritza
    In this thesis, a novel gap waveguide topology is presented alongside an innovative manufacturing approach, complemented by a variety of design methods and topologies for gap waveguide low-pass filters (LPFs) and bandpass filters (BPFs). Moreover, a new design method for filtering antennas is proposed. The primary objective behind all these designs is to develop topologies that can effectively withstand manufacturing tolerances. To begin with, a novel gap waveguide topology is introduced and compared with existing designs from the literature, offering a promising alternative for future applications. Moreover, a cutting-edge manufacturing technique is proposed, leveraging selective laser melting (SLM) and subsequent computer numerical control (CNC) milling to address common challenges associated with selective laser melting, including surface roughness and manufacturing imperfections. In the field of microwave filters, a gap waveguide low-pass filter is presented for the first time. This approach simplifies the design process, employing closed-form expressions and rapidly performing calculations using simulation software. Additionally, several bandpass filters utilizing higher-order modes are introduced, featuring diverse topologies, including inline and stacked configurations. Notably, the innovation in their design extends to create bandpass filters with reduced sensitivity to manufacturing tolerances. This development is particularly pertinent for Q/V/W-band satellite payloads, where it significantly enhances fabrication yields compared to traditional filter designs. Lastly, this Thesis presents an innovative and comprehensive design methodology, encompassing the integration of microwave filters and antennas, known as a filtering antenna. The concept of a filtering antenna offers a multifaceted solution to address the evolving demands of modern communication systems. It combines the functionality of microwave filters with antennas, essential for signal transmission and reception. This integration not only simplifies the system architecture but also brings forth a range of benefits in terms of performance, space utilization, and overall system efficiency.