Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976itmtt..24..718k&link_type=abstract
IEEE Transactions on Microwave Theory and Techniques, vol. MTT-24, Nov. 1976, p. 718-725. Research supported by the Styrelsen fo
Astronomy and Astrophysics
Astronomy
2
Maser Outputs, Power Gain, Radio Astronomy, Signal Stabilization, Traveling Wave Masers, Additives, Bandwidth, Ferromagnetic Materials, Insertion Loss, Iron, Noise Temperature, Wave Dispersion
Scientific paper
Tunable rutile traveling-wave masers (TWMs) have been developed for the frequency ranges 20-25 GHz and 29-35 GHz. Operating data for iron-doped rutile are given and the optimum concentration of iron has been determined. A new type of dielectric image line slow-wave structure (SWS), particularly useful in the frequency range 10-50 GHz, is used in two of the masers. This SWS is found superior to the other structure tested, the dielectrically loaded waveguide. For both types of masers, a ferromagnetic isolator is used in order to ensure the gain stability of better than plus or minus 0.2 dB at 30 dB net gain, required for radio astronomical applications. The instantaneous 3-dB bandwidth is 30-60 MHz, depending on the maser. The maser package noise temperature at the input waveguide flange was measured to 27 plus or minus 4 K.
Kollberg Erik L.
Lewin P. T.
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