DocumentCode :
1040775
Title :
Measurements on a 215-GHz subharmonically pumped waveguide mixer using planar back-to-back air-bridge Schottky diodes
Author :
SIEGEL, Peter H. ; Dengler, Robert J. ; Mehdi, Imran ; Oswald, John E. ; Bishop, William L. ; Crowe, Thomas W. ; Mattauch, Robert J.
Author_Institution :
Jet Propulsion Lab., California Inst. of Technol., Pasadena, CA, USA
Volume :
41
Issue :
11
fYear :
1993
fDate :
11/1/1993 12:00:00 AM
Firstpage :
1913
Lastpage :
1921
Abstract :
This paper presents design and performance data for a 215-GHz subharmonically pumped waveguide mixer using an antiparallel-pair of planar air-bridge-type GaAs Schottky-barrier diodes. The waveguide design is a prototype for a 640-GHz system and uses split-block rectangular waveguide with a 2:1 width-to-height ratio throughout. The measured mixer noise and conversion loss are below that of the best reported whisker contacted or planar-diode mixers using the subharmonic-pump configuration at this frequency. In addition, the required local oscillator power is as low as 3 mW for the unbiased diode pair, and greater than 34 dB of LO noise suppression is observed. Separate sideband calibration, using a Fabry-Perot filter, indicates that the mixer can be tuned for true double sideband response at an intermediate frequency of 1.5 GHz. Microwave scale model measurements of the waveguide mount impedances are combined with a mixer nonlinear analysis computer program to predict the mixer performance as a function of anode diameter, anode finger inductance, and pad-to-pad fringing capacitance. The computed results are in qualitative agreement with measurements, and indicate that careful optimization of all three diode parameters is necessary to significantly improve the mixer performance
Keywords :
Schottky-barrier diodes; circuit analysis computing; gallium arsenide; mixers (circuits); noise; nonlinear network analysis; rectangular waveguides; solid-state microwave circuits; waveguide components; 1.5 GHz; 215 GHz; 3 mW; EHF; Fabry-Perot filter; GaAs; GaAs Schottky-barrier diodes; MM-wave type; air-bridge Schottky diodes; anode diameter; anode finger inductance; antiparallel-pair; diode parameters; double sideband response; local oscillator power; mixer nonlinear analysis computer program; mixer performance; pad-to-pad fringing capacitance; planar back-to-back diodes; sideband calibration; split-block rectangular waveguide; subharmonic-pump configuration; subharmonically pumped mixer; waveguide mixer; waveguide mount impedances; Anodes; Frequency measurement; Gallium arsenide; Loss measurement; Mixers; Noise measurement; Planar waveguides; Prototypes; Rectangular waveguides; Schottky diodes;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/22.273416
Filename :
273416
Link To Document :
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