| 单词 | Friis, Harald T. (1893–1976) |
| 释义 | Friis, Harald T. (1893–1976) An electrical engineer with a focus on radio systems, Friis was director of a research team at Bell Telephone Laboratories that developed the first microwave transmission systems. The first primitive systems, used in military applications in the European and Pacific theaters of World War II, could handle up to 2,400 voice conversations over five channels. The first public demonstration was conducted between the West Street lab and Neshanic, New Jersey in October 1945, and construction began on the first experimental microwave telephone network in 1947. Friis also was instrumental in the development of several radar systems and various millimeter-wave systems, and made fundamental contributions to the understanding of the role of noise in radio receivers. See also Bell Labs, microwave, noise, and radar. |
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