A superconducting diplexer for cosmic microwave background experiments

M. Madi, M. Mattes, J. R. Mosig, D. Rauly, P. Febvre

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Cosmic microwave background (CMB) studies require observations in several frequency bands simultaneously. For example, the detection of clusters of remote galaxies can be performed by comparing CMB photon fluxes at different frequencies, using the spectral deformation of the Planck law, due to the Sunyaev-Zeldovich effect. We propose a single pixel design to receive and detect simultaneously two frequency bands of the (CMB), centered at 150 and 220 GHz. It is composed of a bow-tie antenna, sensitive to the polarization of the incident radiation, feeding a diplexer structure to separate the signal towards two kinetic inductance resonators associated respectively with the 130-170 and 200-270 GHz frequency bands. The diplexer makes use of 150 nm thick niobium-based superconducting transmission lines of the coplanar strip-lines (CPS) type, for filtering and separation purposes, deposited on a 30 μm thick quartz substrate. A new coplanar matching structure, taking into account the kinetic inductance of the superconducting films, is proposed and achieves a nearly perfect match over more than 25% of each frequency band, along with a signal separation ratio above 30 dB at both center frequencies. The size of a single pixel is 0.9 mm × 1.2 mm.

Original languageEnglish
Article number015011
JournalSuperconductor Science and Technology
Volume27
Issue number1
ISSN0953-2048
DOIs
Publication statusPublished - Jan 2014
Externally publishedYes

Keywords

  • astrophysics
  • cosmic microwave background radiation detectors
  • detector arrays
  • multi-channel detectors
  • superconductive detectors

Cite this

Madi, M. ; Mattes, M. ; Mosig, J. R. ; Rauly, D. ; Febvre, P. / A superconducting diplexer for cosmic microwave background experiments. In: Superconductor Science and Technology. 2014 ; Vol. 27, No. 1.
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A superconducting diplexer for cosmic microwave background experiments. / Madi, M.; Mattes, M.; Mosig, J. R.; Rauly, D.; Febvre, P.

In: Superconductor Science and Technology, Vol. 27, No. 1, 015011, 01.2014.

Research output: Contribution to journalJournal articleResearchpeer-review

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