Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976itmtt..24..725c&link_type=abstract
IEEE Transactions on Microwave Theory and Techniques, vol. MTT-24, Nov. 1976, p. 725-730.
Astronomy and Astrophysics
Astronomy
2
Amplifier Design, Microwave Amplifiers, Millimeter Waves, Radio Telescopes, Traveling Wave Masers, Microwave Coupling, Noise Reduction, Power Gain, Prototypes, Radio Astronomy, Slots, Waveguides
Scientific paper
A description is given of a newly developed traveling-wave maser amplifier for use at the new 13.7-m millimeter-wave radio telescope of the Five College Radio Astronomy Observatory (FCRAO) near Amherst, MA. The maser amplifier, using iron-doped rutile as the active maser material, has achieved 15-dB electronic gain in the prototype over an instantaneous bandwidth of 140 MHz in the frequency range from 85 to 90 GHz. The use of a slot-fed image-guide mode which provides a wide-bandwidth coupling to the maser material is described and analyzed. Reduction of the total system noise temperature to less than 100 K including the atmosphere can be realized with these maser devices providing an order of magnitude improvement in system sensitivity.
Cardiasmenos Apostle George
Shanley J. F.
Sigfrid Yngvesson K.
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