Abstract
We have produced a prototype broadband, low-sidelobe conical corrugated feed horn suitable for measurements of the Cosmic Microwave Blackground (CMB) radiation in the frequency band 120–150 GHz. The antenna is a first prototype for the Low Frequency Instrument array in ESA's PLANCK mission, a space project dedicated to CMB anisotropy mesurements in the 30–900 GHz range. We describe the fabrication method, based on silver electro-formation, and present the two-dimensional antenna beam pattern measured at 140 GHz with a milimeter-wave automated scalar test range. The beam has good symmetry in the E and H planes with a far sidelobe level approaching –60 dB at angles ∼ 80°. An upper limit to the return loss was measured to be –21 dB.
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Bersanelli, M., Mattaini, E., Santambrogio, E. et al. A Low-Sidelobe, High Frequency Corrugated Feed Horn for CMB Observations. Experimental Astronomy 8, 231–238 (1998). https://doi.org/10.1023/A:1008019826435
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DOI: https://doi.org/10.1023/A:1008019826435