stripLineCustom

Create a coupled single-ended or differential transmission line in strip form

Since R2024b

Description

Use the stripLineCustom object to create edge-coupled striplines located within the layers of multi-layer PCBs. Striplines are high speed transmission lines used for routing various RF components in the inner layers of a multi-layer printed circuit board (PCB). The structure consists of a transmission line trace surrounded by dielectric material sandwiched between two ground planes.

Creation

Syntax

custstrip = stripLineCustom

custstrip = stripLineCustom(name=value)

Description

custstrip = stripLineCustom creates a default coupled form of single-ended or differential transmission line. The default pcb substrate isTeflon with a thickness of 0.0016 meters. The resulting dimensions are for a default resonant frequency of 2.5 GHz.

custstrip = stripLineCustom(name=value) sets Propertiesusing one or more name-value arguments. For example custstrip = stripLineCustom(TraceWidth=0.004) creates a custom stripline with a trace width of 0.004 meters. Properties not specified retain their default values.

Properties

TraceType — Type of trace

'Single' (default) | 'Differential'

Trace type specified as either 'Single' or 'Differential'.

Example: custstrip = stripLineCustom(TraceType='Differential')

Data Types: char

TraceLength — Length of the trace

0.0271 (default) | positive scalar

Trace length specified in meters.

Example: custstrip = stripLineCustom(TraceLength=0.026)

Data Types: double

TraceWidth — Width of the trace

0.0051 (default) | positive scalar

Trace width specified in meters.

Example: custstrip = stripLineCustom(TraceWidth=0.0049)

Data Types: double

TraceSpacing — Spacing between differential traces

0.0046 (default) | positive scalar

Trace spacing, when the trace type is differential, specified in meters.

Example: custline = stripLineCustom(TraceSpacing=0.0051)

Data Types: double

TraceOffsetX — Offset of the reference trace along the X-axis

0.0 (default) | positive scalar

Reference trace offset, along the X-axis, specified in meters.

Example: custline = stripLineCustom(TraceOffsetX=0.005)

Data Types: double

Height — Height of the ground plane above the stripline trace

0.0030 (default) | positive scalar

The height from the ground plane to the stripline trace, specified in meters.

Example: custline = stripLineCustom(Height=0.0040)

Data Types: double

GroundPlaneLength — Length of the ground plane

0.06 (default) | positive scalar

Length of the ground plane specified in meters.

Example: custstrip = stripLineCustom(GroundPlaneLength=0.063)

Data Types: double

LeftCoupledTraceGap — Gap between the left-coupled traces

0.0046 (default) | positive scalar

The gap between left-coupled traces specified in meters. If left-coupled traces are not required this property should be set to 0.

Example: custline = stripLineCustom(LeftCoupledTraceGap=0.005)

Data Types: double

RightCoupledTraceGap — Gap between right-coupled traces

0.0046 (default) | positive scalar

The gap between right-coupled traces specified in meters. If right-coupled traces are not required this property should be set to 0.

Example: custline = stripLineCustom(RightCoupledTraceGap=0.005)

Data Types: double

Substrate — Type of dielectric material

'Teflon' (default) | dielectric object

Type of dielectric material used as a substrate, specified as a dielectric object.

Example: d = dielectric('FR4'); custline = stripLineCustom(Substrate=d)

Data Types: string | char

Conductor — Type of metal

PEC (default) | metal object

Type of metal used for the conducting layers, specified as a metal object.

Example: m = metal('copper'); custline = stripLineCustom(Conductor=m)

Data Types: char | string

Object Functions

show	Display PCB component structure or PCB shape
sparameters	Calculate S-parameters for RF PCB objects
mesh	Change and view mesh properties of metal or dielectric in PCB component
current	Calculate and plot current distribution
charge	Calculate and plot charge distribution
feedCurrent	Calculate current at feed port
layout	Plot all metal layers and board shape
shapes	Extract all metal layer shapes of PCB component
design	Design a custom transmission line in stripline form around a specified frequency
rlgc	Compute resistances, inductances, conductances, and capacitances
propagationDelay	Compute propagation delay of transmission line
getZEven	Calculate even mode impedance of differential PCB transmission line
getZOdd	Calculate odd mode impedance of differential PCB transmission line
dgs	Create defected ground structure of PCB element

Examples

Create a Default Custom Stripline

This example shows the creation and visualization of default custom stripline object

Create the stripline

Create the object

custline = stripLineCustom

custline = 
  stripLineCustom with properties:

               TraceType: 'Single'
             TraceLength: 0.0271
              TraceWidth: 0.0051
            TraceOffsetX: 0
                  Height: 0.0030
       GroundPlaneLength: 0.0600
     LeftCoupledTraceGap: 0.0046
    RightCoupledTraceGap: 0.0046
               Substrate: [1×1 dielectric]
               Conductor: [1×1 metal]

Visualize the stripline

Use the show function and layout function to visualize the stripline

show(custline)

layout(custline)

Edge-Coupled Differential Custom Stripline

This example shows the creation and visualization of a differential stripline with two pairs of right-coupled lines.

Create Stripline

Set the appropriate stripline properties of the stripline object.

diffline = stripLineCustom(TraceType="Differential",TraceWidth=0.002,RightCoupledTraceGap=[0.003,0.003],LeftCoupledTraceGap=0)

diffline = 
  stripLineCustom with properties:

               TraceType: 'Differential'
             TraceLength: 0.0271
              TraceWidth: 0.0020
            TraceSpacing: 0.0046
            TraceOffsetX: 0
                  Height: 0.0030
       GroundPlaneLength: 0.0600
     LeftCoupledTraceGap: 0
    RightCoupledTraceGap: [0.0030 0.0030]
               Substrate: [1×1 dielectric]
               Conductor: [1×1 metal]

Visualize Stripline

Use the show and layout functions to visualize the stripline.

show(diffline)

layout(diffline)

Version History

Introduced in R2024b