Title :
Wideband feeds and low noise amplifiers for large arrays
Author :
Weinreb, S. ; Akgiray, A. ; Russell, D.
Author_Institution :
Dept. of Electr. Eng., California Inst. of Technol., Pasadena, CA, USA
Abstract :
The state of the art for feeds and LNAs with frequency ranges approaching one decade will be presented. These components reduce the cost of receivers required to cover a given frequency range and enable observations requiring large bandwidth such as spectral index measurements, search for spectral lines with unknown red shift, and detection of transient events. An example of a 2 to 12 GHz feed will be given and compared in efficiency with an octave band feed. Low noise amplifiers for the 0.5 to 12 GHz range utilizing HEMT and SiGe bipolar transistor will be described.
Keywords :
low noise amplifiers; radiotelescopes; receivers; red shift; HEMT; LNA; SiGe bipolar transistor; bandwidth; frequency 0.5 GHz to 12 GHz; frequency 2 GHz to 12 GHz; low noise amplifiers; radio astronomy receivers; redshift; spectral index measurement; spectral lines; transient events; wideband feeds; Feeds; HEMTs; Low-noise amplifiers; Noise; Radio astronomy; Silicon germanium; Wideband;
Conference_Titel :
General Assembly and Scientific Symposium, 2011 XXXth URSI
Conference_Location :
Istanbul
Print_ISBN :
978-1-4244-5117-3
DOI :
10.1109/URSIGASS.2011.6051201
