Planar polarimetry receivers for large imaging arrays at Q-band

Pekka Kangaslahti, Todd Gaier, Michael Seiffert, Sander Weinreb, Dennis Harding, Douglas Dawson, Mary Soria, Charles Lawrence, Benjamin Hooberman, Amber Miller

Research output: Contribution to journalConference articlepeer-review


The characterization of the intensity fluctuations of the Cosmic Microwave Background (CMB) will be followed by the mapping of the polarization fluctuations of the CMB. Measurement of the polarization fluctuations requires highly sensitive instruments that are only possible by increasing the number of receivers. We are developing a large receiver array for the Q, U Imaging Experiment (QUIET) by building individual receivers that have noise temperatures close to the physical limit and that are simple, and low cost to build and operate. We developed these planar polarimetry receivers for Q-band by designing InP MMIC amplifiers with noise below 20 K, low loss and highly balanced phase switches and an entirely planar hybrid thin film circuit for the detection of the Stokes parameters Q and U. Our receivers achieve 25 K noise temperature over 8 GHz bandwidth and provide the I, Q and U parameters simultaneously. These planar modules have a simple plug in architecture that enables automated production of a large number of receivers and simple integration of large arrays of receivers.

Original languageEnglish (US)
Article number4014826
Pages (from-to)89-92
Number of pages4
JournalIEEE MTT-S International Microwave Symposium Digest
StatePublished - 2006
Externally publishedYes
Event2006 IEEE MTT-S International Microwave Symposium Digest - San Francisco, CA, United States
Duration: Jun 11 2006Jun 16 2006


  • Cosmic Microwave Background (CMB)
  • MMICs
  • Millimeter wave imaging
  • Millimeter wave phase shifters
  • Millimeter wave radiometry
  • Polarimetry

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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