s2s
Converts S-parameters to S-parameters with a different calculated impedance.
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Syntax
Function call
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s_params_new = s2s(s_params, Z0)— converts scattering parameterss_paramswith calculated total resistanceZ0in scattering parameterss_params_newwith a default rated impedance50Om.
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s_params_new = s2s(s_params, Z0, Z0_new)— converts scattering parameterss_paramswith calculated total resistanceZ0in scattering parameterss_params_newwith calculated total resistanceZ0_new.
Arguments
Input arguments
# s_params — N-port S-parameters
+
N×N×M array of complex numbers
Details
-port S-parameters specified as an array of complex numbers of the size on on , where represents the number of frequency points -port S-parameters.
# Z0 is the calculated impedance, ohms
+
50 | the real scalar | the real vector
Details
The calculated impedance in ohms is set using one of the following methods:
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A real scalar, if you want to set the same calculated impedance for all network ports.
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A real vector of length if you want to set a different design impedance for each port in - the port network.
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A real vector of length if you want to set a different design impedance for each of the frequencies in the data.
If the calculated impedance is a vector, and the number of ports is is equal to the number of data frequencies , , then the function sparameters assigns each element of the vector to each network port. To set the calculated impedance for each frequency in this case, specify Z0 as a three-dimensional vector in size on on .
# Z0_new — estimated impedance, ohms
+
50 | the real scalar | the real vector
Details
The calculated impedance in ohms, given as a real scalar or vector.
Output arguments
# s_params_new — N-port hybrid S-options
+
N×N×M array of complex numbers
Details
-port hybrid S-parameters returned as an array of complex numbers of the size on on , where represents the number of frequency points -port hybrid S-parameters.
Examples
Conversion of S-parameters to S-parameters with a different design impedance
Details
Let’s define a matrix of S-parameters and convert them to S-parameters with a different calculated impedance.
using EngeeRF
s_11 = 0.61*exp(1im*165/180*pi)
s_21 = 3.72*exp(1im*59/180*pi)
s_12 = 0.05*exp(1im*42/180*pi)
s_22 = 0.45*exp(1im*(-48/180)*pi)
s_params = [s_11 s_12; s_21 s_22]
z0 = 50
z0_new = 40
s_params_new = s2s(s_params,z0,z0_new)2×2 Matrix{ComplexF64}:
-0.503922+0.156317im 0.0372749+0.0349018im
1.89287+3.29405im 0.414978-0.328637im