Design trade-offs in feed systems for ultra-wideband VLBI observations
Conference contribution, 2018

Due to the advanced capability of today’s ultra-wideband feed systems and low-noise amplifiers, interesting upgrades for future VLBI receiver and tele- scope design should be considered. Multiple input pa- rameters need to be taken into account for optimal sensitivity and applications of the future astronomical and geodetic observational systems. In this paper we present an overview of some trade-offs for wideband systems between SEFD, bandwidth and telescope re- flector optics. We evaluate receiver bandwidths from 3.5:1 to 10.3:1 bandwidth within the frequency range 1.5-24 GHz in different configurations. Due to poten- tial RFI-pollution of the lower frequencies we present potential feed upgrades for the most common reflector geometries ofVGOS and EVN telescopes that mitigate this problem. The results of this work is relevant for fu- ture VLBI stations and telescope design in general. Keywords

vgos

quad-ridge flared horn

sefd

vlbi

ultra wideband

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

Rüdiger Haas

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

Electrical Engineering, Electronic Engineering, Information Engineering

More information

Latest update

12/21/2018