rfwrite

Write RF network data to Touchstone file

Syntax

rfwrite(data,freq,filename)

rfwrite(netobj,filename)

rfwrite(nportobj,filename)

rfwrite(_____,Name=Value)

Description

rfwrite(data,freq,filename) creates a Touchstone data

file, filename. rfwrite Touchstone files output 16 digits.

Note

RF Toolbox™ supports reading and writing Touchstone 1.1 files and reading Touchstone 2.0 files. (since R2023b)

rfwrite(netobj,filename) creates a Touchstone file from a network parameter object, netobj.

rfwrite(nportobj,filename) creates a Touchstone file from a nport object, nportobj.

rfwrite(_____,Name=Value) creates a Touchstone file using the options specified in the name-value arguments for the file specified in filename. For example, rfwrite(S150,'passive150.s2p',FrequencyUnit="MHz") writes Touchstone file passive150.s2p in MHz using the S-parameters stored in the variable, S150.

Examples

Write Touchstone File Using Data and Frequency Values

Write a new Touchstone file from file default.s2p using data and frequency values. The output is stored in defaultnew.s2p.

S50 = sparameters('default.s2p');
data = S50.Parameters;
freq = S50.Frequencies;
rfwrite(data, freq, 'defaultnew.s2p')

Write Touchstone File Using Network Object Parameters

Convert an existing Touchstone file passive.s2p to S-parameters with a new resistance value.

S50 = sparameters('passive.s2p');
S100 = newref(S50,100);

Write a Touchstone file passive100.s2p using the new S-parameters.

rfwrite(S100, 'passive100.s2p');

Write Touchstone File Using Name-Value Arguments

Convert an existing Touchstone file passive.s2p to S-parameters with a new resistance value.

S50 = sparameters('passive.s2p');
S150 = newref(S50,150);

Write a Touchstone file passive150.s2p in MHz using the new S-parameters.

rfwrite(S150, 'passive150.s2p',FrequencyUnit="MHz");

Write Touchstone File Using Y-Parameters

Convert an existing Touchstone file passive.s2p to Y-parameters.

Y50 = yparameters('passive.s2p');

Write a Touchstone file passive.y2p in MHz using the new Y-parameters.

rfwrite(Y50, 'passive.y2p',FrequencyUnit="MHz");

Input Arguments

data — Number of ports and frequencies

matrix

Number of ports and frequencies, specified as an N-by-N-by-K matrix, to create Touchstone file. N is the number of ports of data to be written. K is the number of frequencies.

Data Types: double
Complex Number Support: Yes

freq — Value of frequencies

numeric vector

Value of frequencies, specified as a numeric vector of length K, represents the value of frequencies in Hz.

Data Types: double

filename — Name of Touchstone file

character vector | string scalar

Name of a Touchstone file, specified as a character vector.

Example: default.s2p

Data Types: char | string

netobj — Network parameter object

scalar

Network parameter object, specified as one of the following: sparameters, yparameters, zparameters, gparameters, hparameters, abcdparameters, and tparameters.

Data Types: double

nportobj — N-port object

nport object

N-port object, specified as a nport object. If the N-port object represents a 2-port circuit element with noise data, the noise data is written to the Touchstone file.

Data Types: double

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

Example: rfwrite(S150,'passive150.s2p',FrequencyUnit="MHz")

FrequencyUnit — Scaling unit for frequency values

"GHz" (default) | "MHz" | "KHz" | "Hz"

Scaling unit for frequency value, specified as a comma-separated pair consisting of Frequency Unit and any one of the values shown in value summary.

Example: FrequencyUnit="MHz"

Data Types: double

Parameter — Network parameter type

'S' (default) | 'Y' | 'Z' | 'h' | 'g'

Network parameter type, specified as a comma-separated pair consisting of Parameter and any one of the values shown in value summary. This pair determines the parameter type the data has to be converted into in the Touchstone file.

Example: Parameter='Z'

Data Types: double
Complex Number Support: Yes

Format — File storage format

"MA" (default) | "DB" | "RI"

File storage format, specified as a comma-separated pair consisting of Format and any one of the values shown in value summary. This pair determines the format to store the Touchstone file.

Example: Format="MA"

ReferenceResistance — Resistance

50 (default) | positive scalar (Ohm)

Reference resistance, specified as a comma-separated pair consisting of ReferenceResistance and a positive scalar.

Example: ReferenceResistance=100

Data Types: double

ForceOverwrite — Flag to suppress the warning message while overwriting existing file

false (default) | true

Flag to suppress the warning message while overwriting an existing file, specified as a comma-separated pair consisting of ForceOverwrite and a logical value. Set ForceOverwrite to true, to overwrite the filename without a warning message.

Example: ForceOverwrite=true

Data Types: double

Version History

Introduced in R2014a