A Low-Sidelobe, High Frequency Corrugated Feed Horn for CMB Observations |
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| Authors: | M Bersanelli E Mattaini E Santambrogio A Simonetto S Cirant F Gandini C Sozzi N Mandolesi F Villa |
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| Institution: | (1) CNR, Istituto di Fisica Cosmica, Milano, Italy;(2) CNR, Istituto TESRE, Bologna, Italy |
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| 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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| Keywords: | cosmic microwave background microwave instrumentation |
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