s_parameters介紹(38頁)-閱讀頁
2025-05-19 10:34本頁面
【正文】 ices are symmetrical. A symmetrical matrix has symmetry about the leading diagonal. In the case of a symmetrical 2port work, that means that S21 = S12 and interchanging the input and output ports does not change the transmission properties. A transmission line is an example of a symmetrical 2port work. 26 Sparameters A little math… Parameters along the leading diagonal, S11 amp。 S22, of the Smatrix are referred to as reflection coefficients because they refer to the reflection occurring at one port only. 27 Sparameters A little math… Parameters along the leading diagonal, S11 amp。) 33 Sparameters Larger works: A Network may have any number of ports. The Smatrix for an nport work contains n2 coefficients (Sparameters), each one representing a possible inputoutput path. The number of rows and columns in an Sparameters matrix is equal to the number of ports. For the Sparameter subscripts “ij”, “j” is the port that is excited (the input port) and “i” is the output port. 34 Sparameters 35 Sparameters Sum up… ? Sparameters are a powerful way to describe an electrical work ? Sparameters change with frequency / load impedance / source impedance / work ? S11 is the reflection coefficient ? S21 describes the forward transmission coefficient (responding port 1st!) ? Sparameters have both magnitude and phase information ? Sometimes the gain (or loss) is more important than the phase shift and the phase information may be ignored ? Sparameters may describe large and plex works ? If you would like to learn more please see next slide: 36 Sparameters Further reading: Agilent papers National Instruments paper EDB?OpenDocument Other links: Online lecture OLL140 Intro to Sparameters Eric Bogatin Online lecture OLL141 S11 amp。 test tools for controlled impedance amp。 software 169。2020 Polar Instruments Your contacts at Polar: USA: Ken Taylor (800) 328 0817 Europe: Neil Chamberlain +44 23 9226 9113 Asia / Pacific: Terence Chew +65 6873 7470
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