yparameters

Create Y-parameter object

Syntax

hy = yparameters(filename)

hy = yparameters(hnet)

hy = yparameters(data,freq)

hy = yparameters(rftbxobj)

Description

hy = yparameters(filename) creates a Y-parameter object hy by importing data from the Touchstone file specified by filename. All data is stored in real/imag format.

hy = yparameters(hnet) creates a Y-parameter object from the RF Toolbox™ network parameter object hnet.

hy = yparameters(data,freq) creates a Y-parameter object from the Y-parameter data, data, and frequencies, freq.

hy = yparameters(rftbxobj) extracts network data from rftbxobj and converts it into y-parameter data.

Examples

Plot Y-Parameters on Smith Chart

Extract Y-parameters from default.s2p and plot on a smith chart.

Y = yparameters('default.s2p')

Y = 
  yparameters with properties:

       NumPorts: 2
     Parameters: [2x2x191 double]
    Frequencies: [191x1 double]

figure;
smith(Y,1,1)

Input Arguments

data — Y-parameter data

array of complex numbers

Y-parameter data, specified as an array of complex numbers, of size N-by-N-by-K. The function uses this input argument to set the value of the Parameters property of hy.

filename — Touchstone data file

character vector

Touchstone data file, specified as a character vector, that contains network parameter data. filename can be the name of a file on the MATLAB^® path or the full path to a file.

Example: hy = yparameters('defaultbandpass.s2p');

freq — Y-parameter frequencies

vector of positive numbers

Y-parameter frequencies, specified as a vector of positive real numbers, sorted from smallest to largest. The function uses this input argument to set the value of the Frequencies property of hy.

hnet — Network parameter data

scalar handle

Network parameter data, specified as a scalar handle. If hnet is a Y-parameter object, then hy is a deep copy of hnet. Otherwise, the function performs a network parameter conversion to create hy. When converting network parameters, the same restrictions apply as those for RF Toolbox network parameter data conversion functions:

• ABCD parameter objects support 2N-port data.

• Hybrid-g parameter objects support 2-port data.

• Hybrid parameter objects support 2-port data.

• S-parameter objects support N-port data.

• Y-parameter objects support N-port data.

• Z-parameter objects support N-port data.

• T-parameter objects support 2-port data.

rftbxobj — network object

scalar

Network object, specified as scalar handle. Specify rftbxobj as one of the following types: rfdata.data, rfdata.network, and any analyzed rfckt type.

Output Arguments

hy — Y-parameter data

scalar handle

Y-parameter data, returned as a scalar handle. disp(hy) returns the properties of the object:

• NumPorts — Number of ports, specified as an integer. The function calculates this value automatically when you create the object.

• Frequencies — Y-parameter frequencies, specified as a K-by-1 vector of positive real numbers sorted from smallest to largest. The function sets this property from the filename or freq input arguments.

• Parameters — Y-parameter data, specified as an N-by-N-by-K array of complex numbers. The function sets this property from the filename or data input arguments.

Version History

Introduced in R2012b

R2023b: Recommended over rfdata.network

yparameters is recommend over rfdata.network because it enables you to calculate Y-parameters for a circuit object, an RF data, and a network.

R2023a: Build network with vector of reference impedances for each port

The yparameters function now allows you to build a network with different reference impedance for each port.