Portal de Periódicos da CAPES

Noise Figures of Radio Receivers

1944; Institute of Electrical and Electronics Engineers; Volume: 32; Issue: 7 Linguagem: Inglês

10.1109/jrproc.1944.232049

2162-6634

H.T. Friis,

Microwave Engineering and Waveguides

A rigorous definition of the noise figure of radio receivers is given in this paper. The definition is not limited to high-gain receivers, but can be applied to four-terminal networks in general. An analysis is made of the relationship between the noise figure of the receiver as a whole and the noise figures of its components. Mismatch relations between the components of the receiver and methods of measurements of noise figures are discussed briefly.