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s2t

Convert S-parameters to T-parameters

Syntax

t_params = s2t(s_params)

Description

t_params = s2t(s_params) converts the scattering parameters s_params into the chain scattering parameters t_params. The s_params input is a complex 2-by-2-by-M array, representing M 2-port S-parameters. t_params is a complex 2-by-2-by-M array, representing M 2-port T-parameters.

This function uses the following definition for T-parameters:

[a1b1]=[T11T12T21T22][b2a2],

where:

  • a1 is the incident wave at the first port.

  • b1 is the reflected wave at the first port.

  • a2 is the incident wave at the second port.

  • b2 is the reflected wave at the second port.

Examples

collapse all

Convert S-parameters to T-parameters. Define a matrix of S-parameters.

s11 = 0.61*exp(j*165/180*pi);
s21 = 3.72*exp(j*59/180*pi);
s12 = 0.05*exp(j*42/180*pi);
s22 = 0.45*exp(j*(-48/180)*pi);
s_params = [s11 s12; s21 s22];

Convert to T-parameters

t_params = s2t(s_params)
t_params =

   0.1385 - 0.2304i   0.0354 + 0.1157i
  -0.0452 + 0.1576i  -0.0019 - 0.0291i

References

Gonzalez, Guillermo, Microwave Transistor Amplifiers: Analysis and Design, 2nd edition. Prentice-Hall, 1997, p. 25.

See Also

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Introduced before R2006a

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