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Antenna-Coupled LEKIDs for Multi-Band CMB Polarization Sensitive Pixel

Abstract : Next generation telescopes for observing the Cosmic Microwave Background are demanding in terms of number of detectors and focal plane area filling efficiency. Moreover, foreground reduction in B-Mode polarimetry requires sky observation with multiple frequency bands. In this context KIDs are promising technology because of their large multiplexing rate, while antenna coupling can provide multi-band and dual-polarization solutions in compact design. The proposed polarization sensitive antenna-coupled LEKID is operating at 140 GHz and 160 GHz with a bandwidth of almost 10% for each sub-band. The design involves a microstrip excited slot antenna and two open-stub band-pass filters to direct the signal toward two resonators. These are lumped elements capacitively coupled to the antenna and include an Aluminium strip as absorber. The architecture proposed is particularly simple to fabricate, via-less and only involves two metallization levels. The transition doesn't require any dielectric deposition above the resonator, thus preventing limitations from any source of noise due to non-monocrystalline substrate (TLS). Furthermore, the same coupling technique can be applied to many types of microstrip excited antennas, which allow to accommodate band-pass filters.
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  • HAL Id : tel-02457098, version 1

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Alessandro Traini. Antenna-Coupled LEKIDs for Multi-Band CMB Polarization Sensitive Pixel. Earth Sciences. Université Sorbonne Paris Cité, 2018. English. ⟨NNT : 2018USPCC205⟩. ⟨tel-02457098⟩

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