Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Parameter related to the reproduction or fidelity of a...
Patent
1993-03-04
1994-07-05
Wieder, Kenneth A.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Parameter related to the reproduction or fidelity of a...
324603, 324613, 324633, 324636, G01R 2700
Patent
active
053270916
ABSTRACT:
A device under test is placed in a metallic reverberation chamber and test are run for various characteristics. An antenna positioned in the chamber radiates microwave energy into the chamber. There is disclosed a method of frequency stirring which uses band limited White Gaussian noise (WGN) up-converted by performing double sideband, suppressed carrier modulation with a microwave signal from a synthesized sweeper. The output is then amplified with a TWT amplifier to meet the higher power level requirements. The synthesized sweeper is used to generate the monochromatic signal which determines the center frequency of the output while the WGN source and low pass filters provide the frequency agility.
REFERENCES:
patent: H821 (1990-09-01), Hatfield
patent: 2919215 (1959-12-01), Neuhaus et al.
patent: 3495807 (1970-02-01), Shields et al.
patent: 3614069 (1971-10-01), Murry
patent: 3720402 (1973-03-01), Cummins et al.
patent: 4733165 (1988-03-01), Richardson
patent: 4941134 (1990-07-01), Nyberg et al.
Garfinkle Irwin P.
Singer Donald J.
Solis Jose M.
The United States of America as represented by the Secretary of
Wieder Kenneth A.
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