- Friis formula
There are two formulas or equations named after American radio engineer
Harald T. Friis
*Friis formulas for noise
*Friis transmission equation
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Friis formula
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Friis formulas for noise — The terms the Friis formula and Friis s formula (sometimes Friis formula), named after Harald T. Friis, can refer to either of two formulas used in telecommunications engineering. One relates to noise figure, and the other relates to noise… … Wikipedia
Friis transmission equation — The Friis transmission equation is used in telecommunications engineering, and gives the power received by one antenna under idealized conditions given another antenna some distance away tramitting a known amount of power. The formula was derived … Wikipedia
Harald T. Friis — Infobox Scientist name = Harald T. Friis caption = birth date = 1893 birth place = Naestved, Denmark death date = 1976 death place = Palo Alto, California residence = United States nationality = American field = Electrical engineering work… … Wikipedia
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Noise figure — (NF) is a measure of degradation of the signal to noise ratio (SNR), caused by components in a radio frequency (RF) signal chain. The noise figure is defined as the ratio of the output noise power of a device to the portion thereof attributable… … Wikipedia
Low-noise amplifier — The low noise amplifier (LNA) is a special type of electronic amplifier or amplifier used in communication systems to amplify very weak signals captured by an antenna. It is often located very close to the antenna, so that losses in the feedline… … Wikipedia
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