Filter-bank for broadband sub-mm wave superconducting on-chip spectrometers

Alejandro Pascual Laguna; Kenichi Karatsu; Juan Bueno; Shahab O. Dabironezare; David J. Thoen; Vignesh Murugesan; Akira Endo; Jochem J. A. Baselmans

doi:10.1117/12.2560483

13 December 2020 Filter-bank for broadband sub-mm wave superconducting on-chip spectrometers

Alejandro Pascual Laguna, Kenichi Karatsu, Juan Bueno, Shahab O. Dabironezare, David J. Thoen, Vignesh Murugesan, Akira Endo, Jochem J. A. Baselmans

Author Affiliations +

Proceedings Volume 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X; 114530D (2020) https://doi.org/10.1117/12.2560483
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

DESHIMA 2.0 is a broadband sub-mm wave superconducting on-chip spectrometer for astronomy, targeting an instantaneous octave bandwidth (220 - 440 GHz) sampled with moderate spectral resolution channels (f/df ~ 500). In this work we propose a microstrip filter-bank implementation for DESHIMA 2.0 based on “H-shaped” resonators. These bandpass filters are free from spurious resonances over an octave bandwidth, do not suffer from radiation losses and can be arrayed in large filter-banks thanks to their extremely low reflections off-resonance. The design has been aided by an analytical circuit model that can fast and reliably predict the filter-bank behaviour. Prototype chips have been characterised in terms of frequency response and coupling efficiency.

Conference Presentation

Citation Download Citation

Alejandro Pascual Laguna, Kenichi Karatsu, Juan Bueno, Shahab O. Dabironezare, David J. Thoen, Vignesh Murugesan, Akira Endo, and Jochem J. A. Baselmans "Filter-bank for broadband sub-mm wave superconducting on-chip spectrometers", Proc. SPIE 11453, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy X, 114530D (13 December 2020); https://doi.org/10.1117/12.2560483

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