Sandra K. Johnson is a member of the Communication System Integration Branch of the Communications Division at the National Aeronautics and Space Administration's Glenn Research Center at Lewis Field in Cleveland, Ohio. Her current tasks include assisting a team responsible for evaluation of software-defined radios for space and performing communication system measurements for reflectarrays in the compact range.

Ms. Johnson earned her bachelor of science degree in electrical engineering from Ohio State University and a master of science degree in electrical engineering from the University of Akron. She has presented papers on Ka-band propagation and phased-array system characterization at Ka-Band Utilization, American Institute of Aeronautics and Astronautics (AIAA), and Institute of Electrical and Electronics Engineers (IEEE) conferences.

Ms. Johnson began her career at NASA with the Advanced Communications Technology Satellite (ACTS) Program, focusing on very small aperture terminal (VSAT) ground station installation and maintenance, and Ka-band propagation measurement and analysis. She has also been part of a team developing phased-array system characterization procedures for the operation of phased arrays at high data rates. Ms. Johnson has been involved in communication research at NASA Glenn since 1990.