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Reflective Toraldo pupil for high-resolution millimeter-wave astronomy

Journal
Date Issued
2020
Author(s)
Shitvov, A
•
Pisano, G
•
•
•
Tucker, C
DOI
Abstract
A novel, to the best of our knowledge, beam-shaping reflective surface for high-resolution millimeter/ submillimeter-wave astronomy instruments is presented. The reflector design is based on Toraldo’s superresolution principle and implemented with annulated binary-phase coronae structure inspired by the achromatic magnetic mirror approach. A thin, less than half a free-space wavelength, reflective Toraldo pupil device operated in the W-band has been fabricated using mesh-filter technology developed at Cardiff University. The device has been characterized on a quasi-optical test bench and demonstrated expected reduction of the beam width upon reflection at oblique incidence, while featuring a sidelobe level lower than −10 dB. The proposed reflective Toraldo pupil structure can be easily scaled for upper millimeter and infrared frequency bands as well as designed to transform a Gaussian beam into a flat-top beam with extremely low sidelobe level.
Volume
59
Issue
34
Start page
10729
Uri
Url
Issn Identifier
1559-128X
Rights
open.access
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