EdgeFeed

Create an edge feed object

Since R2024b

Description

Use the EdgeFeed object to create and specify the FeedDefinitions property in a parent pcbComponent object.

Creation

Syntax

f1=EdgeFeed

f1=EdgeFeed(PropertyName=Value)

Description

f1=EdgeFeed creates a defaultEdgeFeed object.

f1=EdgeFeed(PropertyName=Value) sets object Properties using one or more name value arguments.

Properties

SignalLocations — Specifies the location to be positively excited

[-0.01,0] (default) | 1x2 matrix

Specifies the location to be positively excited as a 1x2 matrix in meters.

The first and the second columns correspond to the X and Y coordinates in meters, respectively. This location must lie on the edge of a metal layer. Locations of negative excitation are assumed to lie directly above (+z) and/or below (-z) the location of positive excitation.

Example: f1=EdgeFeed;f1.SignalLocations=[-0.02,0]

Data Types: double

SignalLayers — Board layer for the positive excitation site

1 (default) | scalar

The board layer for the positive excitation site specified as a scalar.

Example: f1=EdgeFeed;f1.SignalLayers=2

Data Types: double

GroundLayers — Board layers for all negative excitation sites

3 (default) | Nx1 matrix.

Specifies the board layers for all negative excitation sites as a Nx1 matrix in meters.

Example: f1=EdgeFeed;f1.GroundLayers=5

Data Types: double

SignalWidths — Width of the positive excitation site

0.002 (default) | scalar

Specifies the width of the positive excitation site as a scalar, in meters.

Example: f1=EdgeFeed;f1.SignalWidths=0.003

Data Types: double

Examples

Edge Feed setup for a stripline-style pcbComponent

This example shows how to instantiate edge feed objects to excite a pcbComponent in stripline configuration.

Convert the default pcbComponent from microstrip format to stripline format by copying its bottom two layers to the top of the layer stack.

p = pcbComponent;
layersTemp = p.Layers;
p.BoardThickness = p.BoardThickness * 2;
p.Layers = [layersTemp(3), layersTemp(2), layersTemp];

The default FeedLocations property has the correct positions for the two feeds. Save this information to a temporary variable and switch the FeedFormat property to 'FeedDefinitions' to expose the pcbComponent's FeedDefinitions property.

feedsTemp = p.FeedLocations;
p.FeedFormat = 'FeedDefinitions';

Introduce two EdgeFeed objects to excite the strip against both ground planes simultaneously. The second is a copy of the first with an updated position.

f1 = EdgeFeed('SignalLocations', feedsTemp(1, 1:2), 'SignalLayers', 3, 'GroundLayers', [1; 5], 'SignalWidths', p.Layers{3}.Width);
f2 = copy(f1);
f2.SignalLocations = feedsTemp(2, 1:2);

Write the EdgeFeed objects to the pcbComponent's FeedDefinitions property, then show the pcbComponent and calculate its S-parameters.

p.FeedDefinitions = [f1 f2];

figure; show(p);

s = sparameters(p, linspace(1e9, 5e9, 10));
figure; rfplot(s);

Version History

Introduced in R2024b