zparameters

Create Z-parameter object

Syntax

hz = zparameters(filename)

hz = zparameters(hnet)

hz = zparameters(data,freq)

hz = zparameters(rftbxobj)

Description

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

hz = zparameters(hnet) creates a Z-parameter object from the RF Toolbox™ network parameter object hnet.

hz = zparameters(data,freq) creates a Z-parameter object from the Z-parameter data, data, and frequencies, freq.

hz = zparameters(rftbxobj) extracts network data from rftbxobj and converts it into z-parameter data.

Examples

Extract and Plot Imaginary Part of Z11

Read the file default.s2p as z-parameters and extract Z11.

Z = zparameters('defaultbandpass.s2p')

Z = 
  zparameters: Z-parameters object

       NumPorts: 2
    Frequencies: [1000x1 double]
     Parameters: [2x2x1000 double]

  rfparam(obj,i,j) returns Z-parameter Zij

z11 = rfparam(Z,1,1);

Plot imaginary part of Z11.

 plot(Z.Frequencies, imag(z11))

Input Arguments

data — Z-parameter data

array of complex numbers

Z-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 hz.

filename — Touchstone data file that contains network parameter data

character vector

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

Example: hz = zparameters('defaultbandpass.s2p');

freq — Z-parameter frequencies

vector of positive numbers

Z-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 hz.

hnet — Network parameter data

scalar handle

Network parameter data, specified as a scalar handle. If hnet is a Z-parameter object, then hz is a deep copy of hnet. Otherwise, the function performs a network parameter conversion to create hz. 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

hz — Z-parameter object

scalar handle

Z-parameter data, returned as a scalar handle. disp(hz) 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 — Z-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 — Z-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

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

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

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