Wideband Sub-mm Wave Superconducting Integrated Filter-bank Spectrometer

The design of an octave bandwidth sub-mm wave superconducting on-chip filter-bank spectrometer for Astronomy is presented. An array of THz band-pass filters subdivides the bandwidth 220–440 GHz into channels with a spectral resolution of 400 and an average maximum coupling strength $f/ \Delta {f} $ of 40%. The filter-bank performance is assessed by means of a transmission line formalism that approximates its behavior. The chip is under fabrication and its measurements will follow.