Optical design of S-band multifeed for the Sardinia Radio Telescope primary focus
Date Issued
2017
Author(s)
Abstract
We present the optical design of an S-band seven feed
cryogenic radio astronomy receiver for illuminating the
64-m diameter Sardinia Radio Telescope (SRT) dish from the
primary focus. The feeds are arranged in a compact hexagonal
configuration with a central one and are cryogenically cooled at
20 K inside a cryostat. Each feed accepts two linear polarizations
and use a circular waveguide with a single outer corrugated
section to achieve a nearly constant beamwidth and low cross
polarization across the 3.0-4.5 GHz band. The simulated
radiation pattern of the SRT telescope is obtained by coupling
the array of feed-horn beam patterns (optimized with the
electromagnetic software CST) with the 64-m parabolic dish
(through a physical optics analysis carried out with GRASP). We
compare the simulated beam pattern of an isolated feed with
those of the same feed embedded in the dense array and analyze
the effects of an absorber located inside the cryostat around the
cryogenic feeds. We found that the absorber improves the overall
system performance by decreasing the cross-coupling effects
between the feeds while adding negligible noise to the system.
Coverage
2017 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO)
Start page
239
Conferenece
2017 IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization for RF, Microwave, and Terahertz Applications (NEMO 2017)
Conferenece place
Seville, Spain
Conferenece date
17-19 May, 2017
Rights
open.access
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