Polarization _lter for microstrip lumped-element kinetic inductance detectors

Abstract : Lumped Element Kinetic Inductance Detectors (LEKIDs) have a broad potential for their future use in Cosmic Microwave Background radiation (CMB) experiments. However, for these experiments, polarization sensitivity is a major requirement and LEKIDs based on meander inductors exhibit a cross polarization around 30%. LEKIDs consist of series inductance-capacitance resonators coupled to a feed line. Coplanar waveguide (CPW), coplanar striplines (CPS) and microstrip (MS) have been tested for the feed line configuration in order to decrease coupling dispersion and avoid parasitic propagating modes. MS configuration, which consists on shield loops around each resonator and a ground plane on the bottom side of the wafer, has already shown good performance and is, for instance, the configuration integrated in NIKA 2 arrays [1]. In this work, continuous ground plane of the MS has been replaced with parallel lines in order to be used as a polarizer. Microwave simulations show that if the spacing between lines is small enough compared to the resonant frequency wavelength, it acts as an effective ground plane with no in uence on the electromagnetic performance. Several devices have been fabricated in order to test the polarizer-ground plane and preliminary experiments show a mitigation of the cross polarization to 2 %. [1] Calvo, M. et al. “ The NIKA2 instrument, a dual-band kilopixel KID array for millimetric astronomy ”, J. Low Temp. Phys, 184: 816 (2016).
Type de document :
Poster
17th International Workshop on Low Temperature Detectors (LTD17), Jul 2017, Fukuoka, Japan. 〈www-x.phys.se.tmu.ac.jp/ltd17/wp/〉
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Contributeur : Emmanuelle Vernay <>
Soumis le : lundi 7 août 2017 - 10:21:48
Dernière modification le : mardi 21 août 2018 - 11:58:03

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  • HAL Id : in2p3-01572365, version 1

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A. Gomez, M. Calvo, J. Goupy, A. Bideaud, F. Levy-Bertrand, et al.. Polarization _lter for microstrip lumped-element kinetic inductance detectors . 17th International Workshop on Low Temperature Detectors (LTD17), Jul 2017, Fukuoka, Japan. 〈www-x.phys.se.tmu.ac.jp/ltd17/wp/〉. 〈in2p3-01572365〉

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