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SUMMARY:Ultra-wideband Phased Array Antennas for Low-Frequency Radio Astro
 nomy - Eloy de Lera Acedo (Cavendish Astrophysics)
DTSTART:20100525T153000Z
DTEND:20100525T163000Z
UID:TALK24792@talks.cam.ac.uk
CONTACT:Sally Hales
DESCRIPTION:Next-generation radio astronomy will be led by the SKA telesco
 pe.  The ambitious objectives of the SKA will be only possible if the requ
 ired technology can be realised within the budget.  Components include: an
 tennas\, amplifiers\, communications\, power supply\, processing technolog
 ies\, etc.  It is a long list of state-of-the-art technology which needs t
 o become real within the next few years.  The SKA aims for ultra-wideband 
 arrays to cover the sub 1 GHz frequency band.  They need to be ultra-wideb
 and among other reasons in order to reduce the cost of the \nsystem.  Howe
 ver\, the realisation of ultra-wideband low-cost low-frequency arrays is n
 ot free of difficulties.  In this talk I focus on the analysis of these is
 sues and its solutions and the design of ultra-wideband arrays fulfilling 
 the SKA requirements.  The array designs presented could be divided in two
  according to the frequency band they intend to cover\; arrays for the hig
 h frequency band of the SKA aperture array proposal (SKA-AAhi: 0.3 to 1GHz
 ) and arrays for the low \nfrequency band (SKA-AAlo: 0.07 to 0.45 GHz).\n
LOCATION:Martin Ryle Seminar Room\, Kavli Building
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