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Performance results of a 300-deg linear phase modulator for spaceborne communications applicationsA phase modulator capable of large linear phase deviation, low loss, and wide band operation with good thermal stability was developed for deep space spacecraft transponder (DST) applications at X-band (8.415 GHz) and Ka-band (32 GHz) downlinks. The design uses a two-stage circulator-coupled reflection phase shifter with constant gamma hyperabrupt varactors and an efficient modulator driver circuit to obtain a phase deviation of +/- 2.5 rad with better than 8 percent linearity. The measured insertion loss is 6.6 dB +/- 0.35 dB at 8415 MHz. Measured carrier and relative sideband amplitudes resulting from phase modulation by sine wave and square modulating functions agree well with the predicted results.
Document ID
19930069633
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Mysoor, Narayan R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Mueller, Robert O.
(JPL Pasadena, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: In: 1993 IEEE Aerospace Applications Conference, 14th, Steamboat Springs, CO, Jan. 31-Feb. 5, 1993, Digest (A93-53626 23-17)
Publisher: Institute of Electrical and Electronics Engineers, Inc.
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking
Accession Number
93A53630
Distribution Limits
Public
Copyright
Other

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