S-Parameters and Linear Components

Touchstone files, S-parameter simulation, lumped and distributed elements

You can specify linear networks by importing S-parameter data files directly into RF Blockset™ models. To plot S-parameter data and the results of rational fitting, use the S-Parameters block. Other RF Blockset blocks enable you to build models using passive components like resistors, capacitors, inductors, and transmission lines.

Blocks

expand all

Elements

Basic Components

Resistor	Model resistor for circuit envelope analysis
Inductor	Model inductor for circuit envelope analysis
Capacitor	Model capacitor for circuit envelope analysis
Mutual Inductor	Model two coupled inductors for circuit envelope analysis
Ground	Simulate connection to electrical ground
Z (Impedance)	Model complex impedance
Attenuator	Model attenuator for RF circuit
Ideal Transformer	Model ideal transformer
Phase Shift	Model phase shift in RF systems
Signal Combiner	Compute sum of RF signals
S-Parameters	Model S-parameter network
Three-Winding Transformer	Compute sum of RF signals
Transmission Line	Model transmission line

RF Compound Components

Antenna	Model antenna or antenna array accounting for incident power wave (RX) and radiated power wave (TX)
Filter	Model RF Filter
LC Ladder	Model LC ladder networks

Simulink Controlled Elements

Variable Attenuator	Model variable attenuator
Variable Capacitor	Model variable capacitor
Variable Inductor	Model variable inductor
Variable Phase Shift	Model variable phase device
Variable Resistor	Model variable resistor

Junctions

Potentiometer	Simulink controlled potentiometer
Circulator	Model ideal frequency-independent circulators with S-parameters
Coupler	Model ideal frequency-independent couplers with S-parameters
Divider	Model ideal frequency-independent dividers or combiners with S-parameters
SPST	Single pole single throw switch
SPnT	Single pole multiple throw switch
SPDT	Single pole double throw switch
Switch	Simulink controlled two–terminal switch

Testbenches

Transducer Gain Testbench

Measures transducer gain of system

Featured Examples

Analysis of Frequency Response of RF System

Uses a few techniques to calculate the steady-state frequency response for a filter-based RF system built from RF Blockset™ Circuit Envelope library blocks. The first technique performs static analysis (harmonic balance) on a circuit comprising of inductors and capacitors. The second technique does time domain simulation using a similar circuit built with the Filter library block. The third technique facilitates small-signal analysis to obtain the frequency response of a filtering system that exhibits nonlinearity at a given operation point. This example helps you validate a circuit envelope model using a static analysis in the frequency domain, a time domain simulation, and small signal analysis in cases where the system exhibits non-linearity.

Open Script

Compare Time and Frequency Domain Simulation Options for S-parameters

Use two different options for modeling S-parameters with the RF Blockset™ Circuit Envelope library. The Time-domain (rationalfit) technique creates an analytical rational model that approximates the whole range of the data. This is a preferable technique when a good fit could be achieved with a small number of poles. When the data has a lot of details or high level of noise, this model becomes large and slow to simulate.

Open Script

Transmission Lines, Delay-Based and Lumped Models

Simulate delay-based and lumped-element Transmission Line using blocks in the RF Blockset™ Circuit Envelope library. The example is sequenced to examine circuit envelope and passband differences, delay-based lossy transmission line sectioning, and lumped element implementation of delay.

Open Script

100 Watt TR Module for S-Band Applications

Use the RF Blockset™ Circuit Envelope library to simulate a 100 Watt transmit and receive (TR) module. Three TR switches provide isolation between the transmitter and receiver and share a common path and components between both chains. You simulate the output power of transmit and receive chains and derive the achieved isolation.

Open Script

Model RF Systems with Antenna Arrays Using RF Blockset Antenna Block

Use the Antenna block to design antenna arrays for an RF system.

Open Script

Design and Simulate Monopulse Tracking System

Model and simulate a monopulse tracking system with a transmitter antenna, receiver antenna, and comparator[1]. The monopulse principle is used in many RADAR applications to estimate the position of the target in space by calculating the error in the azimuth and elevation direction. Monopulse tracking can be achieved using various antenna and comparator configurations. The antenna can be a 3-D antenna such as a horn or a planar antenna such as a simple patch antenna.

Open Script