Design and analysis of low-loss linear analog phase modulator for deep space spacecraft X-band transponder (DST) applicationThis paper summarizes the design concepts, analyses, and the development of an X-band transponder low-loss linear phase modulator for deep space spacecraft applications. A single section breadboard circulator-coupled reflection phase modulator has been analyzed, fabricated, and evaluated. Two- and three-cascaded sections have been modeled and simulations performed to provide an X-band DST phase modulator with +/- 2.5 radians of peak phase deviation to accommodate down-link signal modulation with composite telemetry data and ranging with a deviation linearity tolerance +/- 8 percent and insertion loss of less than 10 +/- 0.5 dB. A two-section phase modulator using constant gamma hyperabrupt varactors and an efficient modulator driver circuit was breadboarded. The measured results satisfy the DST phase modulator requirements, and excellent agreement with the predicted results.
Document ID
19920059866
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 15, 2013
Publication Date
January 1, 1991
Subject Category
Space Communications, Spacecraft Communications, Command And Tracking