MATLAB: Should the Coaxial Transmission Line block include the parameter tangential dielectric loss in RF Blockset 2.2 (R2008a)

RF Blockset

The Coaxial Transmission Line block does not include the parameter tangential dielectric loss.

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This enhancement has been incorporated in Release 2009a (R2009a). For previous product releases, read below for any possible workarounds:

The parameter tangential dielectric loss is not available for the Coaxial Transmission Line block in RF Blockset.

To work around this issue, add this property to coaxial objects defined from the MATLAB command line and then use the General Circuit Element block from the Black Box Elements library to import the new coaxial object into RF Blockset as follows.

1. Rename two files under the folder ‘toolbox\rf\rf\@rfckt\@coaxial’: schema.p and calckl.m

2. Copy the attached two files, calckl.m and schema.p, to the same folder.

3. Quit MATLAB and restart it.

4. Define the coaxial object as follows:

mycoaxial = rfckt.coaxial

5. The object, mycoaxial, shows the following two new properties:

 DielLossSpec: 'SigmaDiel' 
 TanDiel: 0

6. Set the 'RFCKT object' parameter of the General Circuit Element block to the MATLAB variable mycoaxial.

Related Solutions

MATLAB: Can I specify a frequency-dependent IP3 parameter in the RF Blockset

This enhancement has been incorporated in Release 2008b (R2008b). For previous product releases, read below for any possible workarounds:

To work around this issue, use the General Circuit Element block from the Black Box Elements library. Use the following command line functionality to define an RFCKT object called mixer that specifies the mixer behavior and then set the 'RFCKT object' parameter of the General Circuit Element block to the MATLAB variable mixer:

% mixer for the mask parameter ‘RFCKT object’ of the General Circuit Element block % is an RFCKT.MIXER object and should be created in MATLAB workspace:
mixer = rfckt.mixer;
% Create data objects for frequency-dependent S-parameters, spot noise and IP3: 
freq = [1e9 1.4e9];     % two frequencies


sparams(:,:,1) = [-0.7247 - 0.4813i        0;           -0.6857 + 1.7827i  -0.0741 - 0.3216i];
sparams(:,:,2) = [-0.7318 - 0.4715i   0.0014 + 0.0005i; -0.6560 + 1.7980i  -0.0761 - 0.3190i];
sparamsData = rfdata.network('Type', 'S', 'Freq', freq, 'Data', sparams);
freq = [1e9 1.4e9];                       % two frequencies
fmin = [12.08 13.40];                     % Minimum noise figure in dB
gopt = [0.2484-1.2102j 1.0999-0.9295j];   
% "gopt" is a source reflection coefficient to realize minimum noise figure
rn = [0.26 0.45];                         % Equivalent normalized noise resistance
noiseData = rfdata.noise('Freq', freq, 'FMIN', fmin, 'GAMMAOPT', gopt, 'RN', rn);
freq = [1e9 1.4e9];     % two frequencies
ip3 = [0.001 0.05];     % IP3 in Watts at two frequencies
ip3Data = rfdata.ip3('Type', 'IIP3', 'Freq', freq, 'Data', ip3);
% Set mixer’s three properties: NetworkData, NoiseData and NonlinearData with
% three data objects:
mixer.NetworkData = sparamsData
mixer.NoiseData = noiseData
mixer.NonlinearData = ip3Data

MATLAB: Are there no examples in the documentation of the PLOT function for “rfckt.cascade” objects in the RF Toolbox 2.3 (R2008a)

Examples on the PLOT function of the "rfckt.cascade" object are missing in the documentation.

Here is a basic example on how to use the plot the analysis results (S-parameters) of a tee circuit:

R1 = rfckt.seriesrlc('R',26);  %Series

R2 = rfckt.shuntrlc('R',35);  %Shunt
R3 = rfckt.seriesrlc('R',26);   %Series
tee=rfckt.cascade;  % Creating a cascade circuit
tee.Ckts={R1,R2,R3};
freq=[1e6,2e6];   %Assigning frequency for analysis
analyze(tee,freq);   
   % To plot the s21 and s11 parameters on a Linear scale
plot(tee,'s21','s11','Magnitude (linear)')

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Related Solutions

MATLAB: Can I specify a frequency-dependent IP3 parameter in the RF Blockset

MATLAB: Are there no examples in the documentation of the PLOT function for “rfckt.cascade” objects in the RF Toolbox 2.3 (R2008a)

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