Ultra-wideband feed systems for the EVN and SKA - evaluated for VGOS
Conference contribution, 2018

The design of the Square Kilometre Array (SKA) project for radio astronomy is now materializing at a rapid speed; the EU Horizon 2020 RadioNet project BRoad-bAND (BRAND) has the ambition to deliver a decade bandwidth receiver for EVN. The ultra-wideband quad-ridge flared horn (QRFH) feed systems developed for these projects show good performance within the geodetic VLBI Global Observing System (VGOS) frame due to the overlapping frequency bands and reflector geometries. We estimate, through simulation, system equivalent flux density (SEFD) of the two feed systems in the VGOS reflector and compare the it to the existing system installed on one of the 13.2 m diameter reflectors of the Onsala twin telescope (OTT). The two frequency bands analyzed cover 1.5−15.5 GHz and 4.6−24 GHz. Both systems show SEFD better than 1000 Jy over large parts of resp. frequency band - comparable to the 3−18 GHz feed systems. For the SKA QRFH over 4.6−24 GHz, the water vapor absorption line at 22 GHz is within the operational band, therefore we study the application of water-vapor radiometry in line-of-sight of the telescope.

EVN

SKA

VGOS

Water-vapor radiometry

QRFH

Author

Jonas Flygare

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Electronics Laboratory

Miroslav Pantaleev

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Electronics Laboratory

John Conway

Chalmers, Space, Earth and Environment, Onsala Space Observatory

Michael Lindqvist

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Onsala Space Observatory, Observation Support

Leif Helldner

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Electronics Laboratory

Magnus Dahlgren

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Electronics Laboratory

Rüdiger Haas

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Space Geodesy and Geodynamics

Peter Forkman

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Space Geodesy and Geodynamics

10th General Meeting, International VLBI Service for Geodesy and Astrometry (IVS 2018)
Longyearbyen, Svalbard and Jan Mayen,

Areas of Advance

Information and Communication Technology

Infrastructure

Onsala Space Observatory

Subject Categories

Earth and Related Environmental Sciences

Communication Systems

Other Electrical Engineering, Electronic Engineering, Information Engineering

More information

Latest update

12/28/2018