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Millimeter-Wave Lumped Element Superconducting Bandpass Filters for Multi-Color Imaging

Kumar, Shwetank and Vayonakis, Anastasios and LeDuc, Henry G. and Day, Peter K. and Golwala, Sunil and Zmuidzinas, Jonas (2009) Millimeter-Wave Lumped Element Superconducting Bandpass Filters for Multi-Color Imaging. IEEE Transactions on Applied Superconductivity, 19 (3, Par). pp. 924-929. ISSN 1051-8223.

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The opacity due to water vapor in the Earth's atmosphere obscures portions of the sub-THz spectrum (mm/sub-mm wavelengths) to ground based astronomical observation. For maximum sensitivity, instruments operating at these wavelengths must be designed to have spectral responses that match the available windows in the atmospheric transmission that occur in between the strong water absorption lines. Traditionally, the spectral response of mm/sub-mm instruments has been set using optical, metal-mesh bandpass filters [1]. An alternative method for defining the passbands, available when using superconducting detectors coupled with planar antennas, is to use on-chip, superconducting filters [2]. This paper presents the design and testing of superconducting, lumped element, on-chip bandpass filters (BPFs), placed inline with the microstrip connecting the antenna and the detector, covering the frequency range from 209–416 GHz. Four filters were designed with pass bands 209–274 GHz, 265–315 GHz, 335–361 GHz and 397–416 GHz corresponding to the atmospheric transmission windows. Fourier transform spectroscopy was used to verify that the spectral response of the BPFs is well predicted by the computer simulations. Two-color operation of the pixels was demonstrated by connecting two detectors to a single broadband antenna through two BPFs. Scalability of the design to multiple (four) colors is discussed.

Item Type:Article
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Golwala, Sunil0000-0002-1098-7174
Additional Information:© 2009 IEEE. Manuscript received August 19, 2008. First published May 27, 2009; current version published July 10, 2009. This work was supported in part by the NASA Science Mission Directorate, Jet Propulsion Laboratory, and the Gordon and Betty Moore Foundation. Color versions of one or more of the figures in this paper are available online at
Funding AgencyGrant Number
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:Bandpass filters, passive microwave circuits, submillimeter astronomy
Issue or Number:3, Par
Record Number:CaltechAUTHORS:20090808-142502556
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14893
Deposited By: George Porter
Deposited On:01 Sep 2009 23:05
Last Modified:03 Oct 2019 00:53

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