Copyright © 2021, IEEEAja, B.De Ory, M. C.De la Fuente, L.Artal, E.Pascual, J. P.Teresa Magaz, M.Granados, D.Gómez, A.Centros de Excelencia Severo Ochoa, INSTITUTO MADRILEÑO DE ESTUDIOS AVANZADOS EN NANOCIENCIA, SEV-2016-06862022-03-172022-03-172021-01-03IEEE Transactions on Microwaves Theory and Techniques 69(1): 578-589(2021)0018-9480https://ieeexplore.ieee.org/document/9279269http://hdl.handle.net/20.500.12666/681Lumped-element superconducting resonators are a promising technology for their use in millimeter-wave observations and quantum computing applications that require large arrays of extremely sensitive detectors. Among them, lumped-element kinetic inductance detectors (LEKIDs) have shown good performance in the submillimeter band in several earth-based telescopes. In this work, LEKIDs for their use as millimeter-wave receivers of astronomical applications are presented. LEKID arrays using a thin bilayer of superconducting titanium/aluminum (Ti/Al), deposited on the silicon substrate, have been designed and fabricated. The design of a dual-polarization LEKID with the goal of detection at the W-band for two orthogonal polarizations is described and a fabricated array has demonstrated absorption at ambient temperature. Also, an approximate design methodology of the coupling parameter for LEKIDs' readout, essential for dynamic range optimization of the detector under millimeter-wave radiation, is proposed. In addition, the resonance characteristics and coupling factor of the fabricated superconducting resonators using high-quality internal factor Q i under cryogenic temperatures have been analyzed. The design guidelines in this work are applicable to other LEKID arrays, and the presented superconducting Ti/Al thin-film LEKIDs can be used in future receiver arrays in the millimeter bands.engSiliconStripsDetectorsSuperconducting microwave devicesResonatorsSubstratesInductanceinfo:eu-repo/semantics/article10.1109/TMTT.2020.30387771557-9670http://dx.doi.org/10.13039/501100011033http://dx.doi.org/10.13039/100012818info:eu-repo/semantics/restrictedAccess