DeltaGapFeed

Create a delta gap feed object

Since R2024b

Description

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

Creation

Syntax

f1=DeltaGapFeed

f1=DeltaGapFeed(PropertyName=Value)

Description

f1=DeltaGapFeed creates a default DeltaGapFeed object.

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

Properties

SignalLocations — Location where the delta gap feed should be centered

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

Specifies the location where the DeltaGapFeed should be centered as a 1x2 matrix. The location must lie within the chosen metal layer.

The first and the second columns correspond to the X and Y coordinates in meters, respectively. The location must lie within the chosen metal layer.

Example: f1=DeltaGapFeed;f1.SignalLocations=[0.01,0.01]

Data Types: double

SignalLayers — Board layer for the excitation site

1 (default) | scalar

Specifies the board layer for the excitation site as a scalar.

Example: f1=DeltaGapFeed;f1.SignalLayers=2

Data Types: double

SignalWidths — Width of the delta gap feed

0.001 (default) | scalar

Specifies the width of the DeltaGapFeed as a scalar in meters.

Example: f1=DeltaGapFeed;f.SignalWidths=0.002

Data Types: double

CurrentDirection — Current direction of the delta gap feed

"auto" (default) | 1x2 unit vector

Specifies the direction of current that the DeltaGapFeed should produce as a 1x2 unit vector. The first and second columns of the vector contain the x and y values, respectively, of the unit vector.

CurrentDirection can also take the value of "auto" in which case the DeltaGapFeed will be automatically oriented based on its width and the nearest metal edge.

Example: f1=DeltaGapFeed;f1.CurrentDirection=[0.6,0.8]

Data Types: double | char | string

Examples

Delta Gap Feed Setup for an Internal Port

This example shows how to use a DeltaGapFeed object to define an internal port on a pcbComponent object.

Start with the Wilkinson splitter catalog element and convert it to a pcbComponent.

p = pcbComponent(wilkinsonSplitter);

The catalog element has a lumped load bridging the two output terminals. Save its location, then replace it by the placeholder lumpedElement.

internalPortLocation = p.Load.Location;
p.Load = lumpedElement;

Switch the pcbComponent object's FeedFormat property to 'FeedDefinitions' to expose the FeedDefinitions property. Instantiate a DeltaGapFeed at the saved lumped load site and add it to the list of feeds.

p.FeedFormat = 'FeedDefinitions';
f = DeltaGapFeed('SignalLocations', internalPortLocation(1:2), 'SignalLayers', 1, 'SignalWidths', 0.5e-3, 'CurrentDirection', [0 1]);
p.FeedDefinitions(end+1) = f;
figure; show(p);

Calculate 4-port S-parameters for the splitter. Terminate the internal port into a 100-ohm resistance and plot the result.

s = sparameters(p, linspace(1e9, 5e9, 51));
s100 = snp2smp(s, 1:3, 100);
figure; rfplot(s100)

Version History

Introduced in R2024b