Title :
Status update on APERTIF, phased array feeds for the Westerbork Radio Telescope
Author :
van Cappellen, W.A. ; bij de Vaate, Jan Geralt
Author_Institution :
ASTRON, Dwingeloo, Netherlands
Abstract :
The Westerbork Synthesis Radio Telescope (WSRT) will be upgraded with L-band Phased Array Feeds to increase its survey speed. Measurements on a prototype system revealed that out-of-band RFI at the WSRT site generated unacceptably high intermodulation products in the frequency band of operation. A low-loss high-pass filter between the antennas and the low-noise amplifiers was introduced to successfully reduce in-band intermodulation products. Verification of the system performance will be performed with ALPHA-3: a 3-dish PAF interferometer.
Keywords :
antenna arrays; interferometers; radiotelescopes; ALPHA-3; APERTIF; L-band phased array feeds; WSRT; Westerbork Synthesis Radio Telescope; antennas; frequency band; in-band intermodulation products; intermodulation products; low-loss high-pass filter; low-noise amplifiers; out-of-band RFI; three-dish PAF interferometer; Antenna measurements; Arrays; Feeds; Frequency measurement; Radio astronomy; Temperature measurement;
Conference_Titel :
General Assembly and Scientific Symposium (URSI GASS), 2014 XXXIth URSI
Conference_Location :
Beijing
DOI :
10.1109/URSIGASS.2014.6929993
