attenuator

Creates a two-port attenuator.

Library

EngeeRF

Syntax

Function call

att = attenuator() — creates an attenuator object with attenuation 3 dB, whose properties are set by default.

att = attenuator(Name=Value) — creates an attenuator object with properties specified by one or more arguments of the type Name=Value. Unspecified properties retain their default values.

Arguments

Name-value input arguments

# Name — name of the attenuator

+ "Attenuator" (by default) | line

Details

The name of the attenuator. All names must be valid variable names.

Типы данных

String

# Attenuation — insertion loss or attenuation, dB

+ 3 (by default) | scalar

Details

The insertion loss or attenuation applied to the signal, specified as a scalar in dB.

Типы данных

Float64

# Zin — input resistance, ohms

+ 50 (by default) | positive scalar

Details

Input resistance in ohms, set as a positive scalar.

Типы данных

Float64

# Zout — output resistance, ohms

+ 50 (by default) | positive scalar

Details

Output resistance in ohms, set as a positive scalar.

Типы данных

Float64

# NumPorts — number of input and output ports

+ 2 (by default) | scalar

Details

The number of ports specified as an integer scalar.

This argument is read-only.

Типы данных

Int64

# Terminals — terminal names

+ ("p1+", "p2+", "p1−", "p2−") (by default) | tuple of strings

Details

Terminal names specified as a tuple of strings.

This argument is read-only.

Output arguments

# att — attenuator object

+ object

Details

The attenuator object.

Examples

Development and calculation of the S-parameters of the attenuator element

Details

We will develop an attenuator element that reduces the amplitude level of the audio signal by 18 dB, while matching the circuit resistance in 600 Om. Let’s output the properties of the attenuator object.

using EngeeRF

att = attenuator(Attenuation=18,Zin=600,Zout=600)

println("Name: ", att.Name)
println("Attenuation: ", att.Attenuation)
println("Zin: ", att.Zin)
println("Zout: ", att.Zout)
println("NumPorts: ", att.NumPorts)
println("Terminals: ", att.Terminals)

Name: Attenuator
Attenuation: 18.0
Zin: 600.0
Zout: 600.0
NumPorts: 2
Terminals: ("p1+", "p2+", "p1-", "p2-")

Calculate the S-parameters of the attenuator element at the frequency 3 kHz. Let’s output the properties of the S-parameter object.

spar = sparameters(att,3e3)

println("Impedance: ", spar.Impedance)
println("Parameters: ", spar.Parameters)
println("Frequencies: ", spar.Frequencies)
println("NumPorts: ", spar.NumPorts)

Impedance: 50.0
Parameters: ComplexF64[0.8423011906310689 + 0.0im 0.0361668634411914 + 0.0im; 0.0361668634411914 + 0.0im 0.8423011906310689 + 0.0im;;;]
Frequencies: [3000.0]
NumPorts: 2