MATLAB: Save S-parameter in matlab

create .s2p files-parameter

Hello,

I want to create S-parameter(.s2p) file in MATLAB.I have following information stored in matlab.

Freq–stored as 2650*1 double and SParameter–stored as 2650*4 complex double

–vinoth

Best Answer

1. You need to create an RF Data Object from your available data. Doc page is here;

2. Ensure that the dimensions of each of the properties of the RF Data Object match the standard dimensions. As a reference, use this:

orig_data=read(rfdata.data,'default.s2p')

3. Use the WRITE function as described here.

4. The References for the WRITE function as mentioned in the documentation page is EIA/IBIS Open Forum, "Touchstone File Format Specification," Rev. 1.1, 2002

Related Solutions

MATLAB: SIMRF-How to Set the S-parameters

Check out the SimRF Demo model 'simrf_low_if'. The SAW Filter block 'simrf_low_if/SimRF Hartley Receiver/SAW Filter' is actually an S-Parameters block. For more specific details on how to include S-Parameters, please refer to the doc page on the block.

MATLAB: How to cascade a four port device with a two port device using rfckt objects in RF Toolbox

Unlike RF Blockset which has a 'Coupler' block for Simulink, there is no four port device rfckt object. In RF Toolbox, rfckt circuit objects are designed for chain of objects, i.e. we are limited to two port networks. As a workaround, if you could represent the Coupler as a 2 port network touchstone file, it will be possible to read the file and create a 'rfckt.passive' element with it. And then we can continue do the RF analysis on that network.

Please refer to the sample scripts below demonstrating this using two approaches -

1. Use the 'nport' object which reads both S-parameters and noise data from a Touchstone file. Then cascade them using an 'rfbudget' object. This sample script is the recommended and approach and it uses some functions which were released in MATLAB R2017a.

%%Using NEW nport objects (Recommended)/Approach 1
%%Read in a 3 Port coupler 

S3 = sparameters('default.s3p');

Coupler to to 2-port nport

S2 = snp2smp(S3);
rfwrite(S2, 'coupler2port.s2p')
% Creating a nport object
Coupler2port = nport('coupler2port.s2p');
% Note that coupler does not have noise of its own.
ckt1 = nport('default.s2p'); % Other 2 port sparameter device

% Noise Data can be viewed by doing ckt1.NoiseData
%%CASCADE

ckt_cascade = rfbudget([Coupler2port ckt1],[2e9:1e9:10e9],-30,10);
show(ckt_cascade);

To export the network into Simulink, i.e. RF Blockset please uncomment and execute the command below

% exportRFBlockset(ckt_cascade)

2. Use the 'rfckt.amplifier' object which contains both S-parameter and noise data. Then cascade them using 'rfckt.cascade'. This approach is not recommended, as it might be not available in future releases.

%%Using OLD rfckt objects /Approach 2
%%Read in a 3 Port coupler 
ckt = read(rfckt.passive,'default.s3p'); % This only works for passive data
s3p = ckt.NetworkData.Data;
Z0 = ckt.NetworkData.Z0;

Coupler to to 2-port rfckt.amplifier

s2p = snp2smp(s3p,Z0);
% Creating a rfckt object
rfwrite(s2p,ckt.NetworkData.Freq,'coupler2port_ckt.s2p')
Coupler2port = read(rfckt.amplifier,'coupler2port_ckt.s2p');
ckt1 = read(rfckt.amplifier,'default.s2p'); % Other 2 port sparameter device
%%CASCADE
ckt_cascade = rfckt.cascade('Ckts', {Coupler2port, ckt1});
analyze(ckt_cascade, 2.9e9)

Best Answer

Related Solutions

MATLAB: SIMRF-How to Set the S-parameters

MATLAB: How to cascade a four port device with a two port device using rfckt objects in RF Toolbox

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