Harald T. Friis

Harald Trap Friis
Harald Trap Friis
Born	22 February 1893; Næstved, Zealand, Denmark
Died	15 June 1976 (aged 83); Palo Alto, California, United States
Nationality	American
Alma mater	Technical University of Denmark; Columbia University;
Known for	Friis transmission equation; Friis formulas for noise;
Awards	IEEE Medal of Honor (1955); Valdemar Poulsen Medal (1956);
	Scientific career
Fields	Electrical engineering
Institutions	Bell Labs

Harald Trap Friis (22 February 1893 – 15 June 1976), who published as H. T. Friis, was a Danish-American radio engineer whose work at Bell Laboratories included pioneering contributions to radio propagation, radio astronomy, and radar. His two Friis formulas remain widely used.

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