International Journal of Infrared and Millimeter Waves

, Volume 26, Issue 4, pp 505-523

First online:

Millimeter-Wave Profiled Corrugated Horns for the Quad Cosmic Background Polarization Experiment

  • J. A. MurphyAffiliated withNational University of Ireland
  • , E. GleesonAffiliated withNational University of Ireland
  • , G. CahillAffiliated withNational University of Ireland
  • , W. LaniganAffiliated withNational University of Ireland
  • , C. O’SullivanAffiliated withNational University of Ireland
  • , E. CartwrightAffiliated withNational University of Ireland
  • , S. E. ChurchAffiliated withStanford University
  • , J. HinderksAffiliated withStanford University
  • , E. KirbyAffiliated withStanford University
    • , K. ThompsonAffiliated withStanford University
    • , B. RusholmeAffiliated withStanford University
    • , W. K. GearAffiliated withCardiff University
    • , B. MaffeiAffiliated withCardiff University
    • , P. A. R. AdeAffiliated withCardiff University
    • , C. TuckerAffiliated withCardiff University
    • , B. JonesAffiliated withCalifornia Institute of Technology

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In this paper we report on the design and validation process for the profiled corrugated horn antennas, which feed the bolometer array of a cosmology experiment known as QUaD located at the South Pole. This is a cosmic background radiation polarization project, which demands precise knowledge and control of the optical coupling to the signal in order to map the feeble E- and B-polarization mode structure. The system will operate in two millimeter wavelength bands at 100 and 150 GHz. The imaging horn array collects the incoming signal via on-axis front-end optics and a Cassegrain telescope, with a cold stop in front of the array to terminate side-lobe structure at an edge taper of −20dB. The corrugated horn design process was undertaken using in-house analytical software tools, based on modal scattering, specially developed for millimeter -wave profiled horn antennas. An important part of the instrument development was the validation of the horn design, in particular to verify low edge taper levels and the required well-defined band edges. Suitable feed horn designs were measured and were found to be in excellent agreement with theoretical predictions.

Key Words:

profiled corrugated horn antennas polarization CMB