TDRS MA Antenna ESD Qualification Program

Details TDRS MA Antenna ESD Qualification Program TDRS MA Antenna ESD Qualification Program

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998sct..conf...99m&link_type=abstract

Proceedings of the 6th Spacecraft Charging Conference. November 2-6, 1998. AFRL Science Center, Hanscom AFB, MA, USA., p.99-102

Physics

Scientific paper

A single antenna element from the Multiple Access array on the TDRS H,I,J spacecraft was tested for electrostatic discharge. The element consisted of a copper trace on a Kevlar/Nomex honeycomb sandwich, all beneath a sunshield. The objective was not only to measure the ground current generated by a discharge, but to determine whether a discharge that couples in-band to the RF communications signal could cause either damage to a sensitive low-noise amplifier downstream, or through repetition an increase in the overall bit error rate of the communications channel. Therefore, measurements of the discharge events focused on the RF inband peak power and the overall discharge rate. The testing used 25 and 90 keV electron beams, with the sample at both room temperature and the minimum on-orbit expected temperature (-80C). Based on the test results, RF limiters were added to ensure extra margin for the ESD protection of the LNAs. Measured discharge rates were not high enough to increase the overall bit error rate.

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