Sixing Liu was sentenced in Newark federal court Monday to 70 months in prison.
Liu worked for Space & Navigation, a division of New York-based L3 Communications.
He was arrested at his Deerfield, Ill., home in March 2011 and accused of taking restricted military data and presenting them at two conferences in China.
Liu was found guilty of exporting defense data without permission, possessing stolen trade secrets and lying to authorities. The government wanted at least eight years in prison.
His lawyer called Liu “an educator” who downloaded information on his personal laptop to work on outside the office.