rfckt.hybrid

Hybrid connected network

Description

Use the hybrid object to represent hybrid connected networks of linear RF objects characterized by the components that make up the network.

Creation

Syntax

h = rfckt.hybrid

h = rfckt.hybrid('Ckts',value)

Description

h = rfckt.hybrid returns a hybrid connected network object whose properties all have their default values.

h = rfckt.hybrid('Ckts',value) returns a cascaded network with elements specified in the name-value pair property Ckts.

Properties

AnalyzedResult — Computed S-parameters, noise figure, OIP3, and group delay values

rfdata.data object

This property is read-only.

Computed S-parameters, noise figure, OIP3, and group delay values, specified as an rfdata.data object. For more information, see Algorithms.

Data Types: function_handle

Ckts — Circuit objects in network

cell array of object handles

Circuit objects in network, specified as a cell array of object handles. All circuits must be 2-port. By default, this property is empty.

Data Types: char

Name — Object name

1-by-N character array

This property is read-only.

Object name, specified as a 1-by-N character array.

Data Types: char

nport — Number of ports

positive integer

This property is read-only.

Number of ports, specified as a positive integer. The default value is 2.

Data Types: double

Object Functions

analyze	Analyze RFCKT object in frequency domain
calculate	Calculate specified parameters for rfckt objects or rfdata objects
circle	Draw circles on Smith Chart
extract	Extract specified network parameters from rfckt object or data object
listformat	List valid formats for specified circuit object parameter
listparam	List valid parameters for specified circuit object
loglog	Plot specified circuit object parameters using log-log scale
plot	Plot circuit object parameters on X-Y plane
plotyy	Plot parameters of RF circuit or RF data on X-Y plane with two Y-axes
getop	Display operating conditions
polar	Plot specified object parameters on polar coordinates
semilogx	Plot RF circuit object parameters using log scale for x-axis
semilogy	Plot RF circuit object parameters using log scale for y-axis
smith	Plot circuit object parameters on Smith chart
write	Write RF data from circuit or data object to file
getz0	Calculate characteristic impedance of RFCKT transmission line object
read	Read RF data from file to new or existing circuit or data object
restore	Restore data to original frequencies
getop	Display operating conditions
groupdelay	Group delay of S-parameter object or RF filter object or RF Toolbox circuit object

Examples

Create Hybrid Connected Networks

Create hybrid connected networks of linear RF objects with two transmission line objects using rfckt.hybrid.

tx1 = rfckt.txline;
tx2 = rfckt.txline;
hyb = rfckt.hybrid('Ckts',{tx1,tx2})

hyb = 
   rfckt.hybrid with properties:

              Ckts: {[1x1 rfckt.txline]  [1x1 rfckt.txline]}
             nPort: 2
    AnalyzedResult: []
              Name: 'Hybrid Connected Network'

Algorithms

The analyze method computes the S-parameters of the AnalyzedResult property using the data stored in the Ckts property as follows:

• The analyze method first calculates the h matrix of the hybrid network. It starts by converting each component network parameters to an h matrix. The following figure shows a hybrid connected network consisting of two 2-port networks, each represented by its h matrix,

  

  where

  $$\begin{array}{l}\left[h^{\prime }\right]=\left[\begin{array}{cc}{h}_{11}{}^{\prime }& h_{12}{}^{\prime }\\ h_{21}{}^{\prime }& h_{22}{}^{\prime }\end{array}\right]\\ \left[h^{″}\right]=\left[\begin{array}{cc}{h}_{11}{}^{\prime \text{}\prime }& h_{12}{}^{\prime \text{}\prime }\\ h_{21}{}^{\prime \text{}\prime }& h_{22}{}^{\prime \text{}\prime }\end{array}\right]\end{array}$$

• The analyze method then calculates the h matrix for the hybrid network by calculating the sum of the h matrices of the individual networks. The following equation illustrates the calculations for two 2-port networks.

  $$\left[h\right]=\left[\begin{array}{cc}{h}_{11}{}^{\prime }+h_{11}{}^{\prime \text{}\prime }& h_{12}{}^{\prime }+h_{12}{}^{\prime \text{}\prime }\\ h_{21}{}^{\prime }+h_{21}{}^{\prime \text{}\prime }& h_{22}{}^{\prime }+h_{22}{}^{\prime \text{}\prime }\end{array}\right]$$

• Finally, analyze converts the h matrix of the hybrid network to S-parameters at the frequencies specified in the analyze input argument freq.

References

[1] Ludwig, R. and P. Bretchko, RF Circuit Design: Theory and Applications, Prentice-Hall, 2000.

Version History

Introduced before R2006a