Title :
Development of a coolable 2–14 GHz Eleven feed for future radio telescopes for SKA and VLBI 2010
Author :
Kildal, Per-Simon ; Yang, Jian ; Karandikar, Yogesh ; Wadefalk, Niklas ; Pantaleev, Miroslav ; Helldner, Leif
Author_Institution :
Dept. of Signals & Syst., Chalmers Univ. of Technol. (Chalmers), Gothenburg, Sweden
Abstract :
The Eleven feed is a log-periodic array of parallel dipoles in Eleven (II) configuration. It exhibits constant beam width and phase center position over a decade bandwidth, and finds therefore application as a wideband feed for reflector antennas. The present paper gives a summary of the present performance of a 2-14 GHz Eleven feed that is under development for use as a feed for VLBI 2010 radio telescopes for geodesy. Previous reported Eleven feeds did not reach that high in frequency. The intention is also to develop a feed that can be integrated with a low noise amplifier inside a cryostat at temperature of 14 K, and receive the waves focused by the primary reflector through an RF window in the cryostatic cavity. Thereby the lowest system noise temperature is ensured. The present model has successfully survived cooling to 14 K.
Keywords :
low noise amplifiers; radiotelescopes; reflector antenna feeds; Eleven feed; RF window; SKA; VLBI 2010; cryostatic cavity; frequency 2 GHz to 14 GHz; low noise amplifier; parallel dipole; radio telescope; reflector antenna; square kilometer array; very long base-line interferometry; wideband feed; Antenna feeds; Bandwidth; Broadband antennas; Dipole antennas; Frequency; Geodesy; Log periodic antennas; Radio astronomy; Reflector antennas; Temperature;
Conference_Titel :
Electromagnetics in Advanced Applications, 2009. ICEAA '09. International Conference on
Conference_Location :
Torino
Print_ISBN :
978-1-4244-3385-8
Electronic_ISBN :
978-1-4244-3386-5
DOI :
10.1109/ICEAA.2009.5297374