Optimization of the Coupling of High-Frequency Horn Antenna Array to the   ESA PLANCK Submillimeter-Wave Telescope
  We study the electromagnetic coupling of the array of Gaussian and multi-moded horn antennas to the dual-reflector submillimeter-wave telescope on the ESA PLANCK Surveyor designed for measuring the temperature anisotropies and polarization characteristics of the cosmic microwave background. In this paper, we present the results of our analysis concerning the measurement of polarization with tilted off-axis dual-reflector Gregorian telescope and the propagation of multi-moded beams through such a system. 
Vladimir Yurchenko, John Anthony Murphy, and Jean-Michel Lamarre