K-band traveling-wave maser using ruby

Details K-band traveling-wave maser using ruby K-band traveling-wave maser using ruby

Nov 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976itmtt..24..711y&link_type=abstract

IEEE Transactions on Microwave Theory and Techniques, vol. MTT-24, Nov. 1976, p. 711-717.

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1

Microwave Amplifiers, Millimeter Waves, Noise Reduction, Radio Telescopes, Ruby Lasers, Traveling Wave Masers, Amplifier Design, Chromium, Interstellar Masers, Metal Ions, Noise Temperature, Signal Transmission

Scientific paper

The described K-band ruby TW maser, operating in a frequency range which incorporates the important inversion lines of ammonia and the water vapor line at 22.235 GHz, has provided a decrease by an order of magnitude, in system noise temperature as compared to other front ends presently used in radio telescopes at K-band. The maser has also been used to observe or search for a large number of other molecules. The system noise temperature in a radio telescope using the maser is primarily determined by waveguide loss in the waveguide connecting the maser to the feed, and atmospheric thermal noise. Single-sideband system noise temperatures as low as 80 K have been obtained. The maser uses a new type of comb structure and a new isolator configuration to achieve 30-dB net gain over a tunable frequency range of about 20 percent.

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