Title :
600 GHz planar-Schottky-diode subharmonic waveguide mixers
Author :
Mehdi, I. ; Lee, T.H. ; Humphrey, D.A. ; Martin, S.C. ; Dengler, R.J. ; Oswald, J.E. ; Pease, A. ; Smith, R.P. ; Siegel, P.H.
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Abstract :
We report on the first planar two-diode subharmonic mixer operating at 600 GHz. The measured mixer noise temperature of 4200 K DSB is only a factor of 2 worse than the best single diode (whisker-contacted or planar) fundamental mixers and a factor 1.5 worse than the best ever single diode (whisker-contacted) harmonic mixer at similar frequencies. The measured conversion loss is /spl ap/12 dB and a noise temperature between 4200-5300 K can be maintained with a fix tuned circuit over a 1-18 GHz IF bandwidth. The anodes are made via a trilayer direct e-beam write process that results in extremely low parasitic devices with high cutoff frequencies. The mixers are being developed for NASA´s Mission to Planet Earth.
Keywords :
Schottky diode mixers; radiotelescopes; submillimetre wave diodes; submillimetre wave mixers; waveguide components; 12 dB; 600 GHz; Mission to Planet Earth; NASA; Schottky-diode waveguide mixers; THF; conversion loss; high cutoff frequencies; low parasitic devices; noise temperature; planar two-diode subharmonic mixer; trilayer direct e-beam write process; Circuit noise; Diodes; Extraterrestrial measurements; Frequency measurement; Loss measurement; Mixers; Noise measurement; Planar waveguides; RLC circuits; Temperature measurement;
Conference_Titel :
Microwave Symposium Digest, 1996., IEEE MTT-S International
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-3246-6
DOI :
10.1109/MWSYM.1996.508534
