S parameters of port in DB Опции

[sergei94]

when we calculate S parameter in DB

DB is a ratio what ratio takes plase in the S parameters measure?

thanks

[semigas]

S parameters is ratio between powers of incident and reflected waves. As exemple for two port device: S21=20 dB means, that power of incident wave a1 is 100 times smaller than power of reflected wave b2.

An one more thing

S21=b2/a1, this is a complex value. When we talk about gain (measure it):

Gain=|S21| and Gain in dB=20log10(|S21|)

Сообщение отредактировал semigas - Feb 1 2017, 20:24

Эскизы прикрепленных изображений