RF Network Construction

Create RF circuits for frequency domain analysis

Use these RF Toolbox™ circuit objects and functions such as capacitor , inductor, and resistor to create arbitrary networks and calculate the S-parameters and group delay.

Alternatively, use the RFCKT objects and functions to define RF network components and connect them in series, parallel, cascade, hybrid, and inverse hybrid configurations. Then you can use these networks to perform additional RF analysis.

Objects

expand all

Circuit

Basic Elements

`resistor`	Resistor object
`capacitor`	Capacitor object
`inductor`	Inductor object
`circuit`	Circuit object

Linear Elements

`attenuator`	Create two-port attenuator element
`rfantenna`	Create antenna element modeled as transmitter, receiver, or transmit-receive
`rffilter`	Create RF filter object
`nport`	Create linear n-port circuit element
`lcladder`	Create LC ladder network
`seriesRLC`	Create two-port series RLC circuit
`shuntRLC`	Create two-port shunt RLC circuit
`phaseshift`	Create phase-shift circuit
`mutualInductor`	Create mutual inductor element
`rfdivider`	Create three-port Wilkinson power divider element for `circuit` object

Linear Elements—Transmission Lines

`txlineCoaxial`	Create coaxial transmission line
`txlineCPW`	Create coplanar waveguide transmission line
`txlineMicrostrip`	Create microstrip transmission line
`txlineParallelPlate`	Create parallel-plate transmission line
`txlineLumped`	Create lumped transmission line
`txlineRLCGLine`	Create RLCG line transmission line
`txlineTwoWire`	Create two-wire transmission line
`txlineStripline`	Create stripline transmission line element
`txlineEquationBased`	Create equation-based transmission line
`txlineDelayLossless`	Create delay lossless transmission line
`txlineDelayLossy`	Create delay lossy transmission line
`txlineElectricalLength`	Create electrical-length-based transmission line

Nonlinear Elements

`amplifier`	Create two-port amplifier element
`modulator`	Modulator object
`rfelement`	Generic RF element object
`mixerIMT`	Create IMT mixer element

Third-Party Components

`mdlxPart`	Create Modelithics component
`mdlxLibrary`	Create Modelithics library object
`mdlxSetup`	Set up Modelithics library

RFCKT

`rfckt.amplifier`	RF Amplifier
`rfckt.cascade`	Cascaded network
`rfckt.coaxial`	Coaxial transmission line
`rfckt.cpw`	Coplanar waveguide transmission line
`rfckt.datafile`	Component or network from file data
`rfckt.delay`	Delay line
`rfckt.hybrid`	Hybrid connected network
`rfckt.hybridg`	Inverse hybrid connected network
`rfckt.mixer`	2-port representation of RF mixer and its local oscillator
`rfckt.microstrip`	Microstrip transmission line
`rfckt.passive`	Passive component or network
`rfckt.parallel`	Parallel connected network
`rfckt.parallelplate`	Parallel-plate transmission line
`rfckt.rlcgline`	Passive component or network
`rfckt.series`	Series connected network
`rfckt.seriesrlc`	Series RLC component
`rfckt.shuntrlc`	Shunt RLC component
`rfckt.twowire`	Two-wire transmission line
`rfckt.txline`	General transmission line

Functions

expand all

Circuit

`richards`	Convert lumped element circuit to distributed element circuit using Richards' transformation
`kuroda`	Apply Kuroda's transformation based on Kuroda's identities
`sparameters`	Calculate S-parameters for RF data, network, circuit, and matching network objects
`groupdelay`	Group delay of S-parameter object or RF filter object or RF Toolbox circuit object
`copy`	Copy circuit or data object
`cascadesparams`	Combine S-parameters to form cascade network
`add`	Insert circuit element or circuit object into circuit
`delete`	Delete circuit object and decouple its elements
`setports`	Set ports of circuit object
`setterminals`	Set terminals of circuit object
`clone`	Create copy of existing circuit element or circuit object
`noisefigure`	Calculate noise figure of transmission lines, series RLC, and shunt RLC circuits
`rationalfit`	Perform rationalfit on an S-parameters object
`noiseParameters`	Extract noise data from Touchstone file or build noise figure data
`search`	Search Modelithics component of interest
`datasheet`	Open datasheet of Modelithics component

RFCKT

`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
`setop`	Set operating conditions
`groupdelay`	Group delay of S-parameter object or RF filter object or RF Toolbox circuit object

Topics

RF circuit or rfbudget vs. rfckt Objects
Determine when to use RF circuit, rfbudget, and rfckt objects in your RF analysis workflow.
Specify Operating Conditions
Explains how to set and retrieve operating condition values.
RF Circuit Objects
Discover the available RF circuit objects and learn their uses.

Featured Examples

Design Matching Network Using Lumped Components from Modelithics Library

Design a matching network with real-world lumped components from Modelithics SELECT+ Library™.

Open Live Script

Richards-Kuroda Workflow for RF Filter Circuit

Apply Richards-Kuroda workflow to an RF filter circuit.

Open Live Script

Analysis of Coplanar Waveguide Transmission Line in X-Band Application

Analyze a coplanar waveguide (cpw) transmission line for X-band applications. CPW transmission line consists of a central metal strip separated by a narrow gap from two ground planes on either side. The dimensions of the center strip, the gap, the thickness, and permittivity of the dielectric substrate determine the characteristic impedance, group delay, and noise. The gap in the cpw is usually very small and supports electric fields primarily concentrated in the dielectric.

Open Live Script

Design Two-Stage Low Noise Amplifier Using Microstrip Transmission Line Matching Network

Use the RF Toolbox™ microstrip transmission line element to design two-stage low noise amplifier (LNA) for wireless local area network (WLAN) with an input and the output matching network (MNW) to maximize the power delivered through a 50-ohm load and the system.

Open Live Script