createFeed

Create feed location for custom antenna

Since R2023b

Syntax

createFeed(antenna)

createFeed(antenna,FeedLocation,NumEdges)

createFeed(___,Name=Value)

Description

createFeed(antenna) opens an interactive figure window, where you can select the edges for assigning the feed. To specify a region for the feed point, select two points, inside triangles on either side of the air gap or inside triangles that share a common edge.

createFeed(antenna,FeedLocation,NumEdges) creates the feed at the specified location and using specified number of edges.

createFeed(___,Name=Value) creates the feed with additional properties specified by the name-value argument.

Examples

Create Feed to Custom Antenna

This example shows how to create the feed point for a custom antenna in multiple ways.

Create Feed Edge on Shape

Create a rectangle with length 2 m and width 0.1 m. Assign it as a shape to a custom antenna.

r = shape.Rectangle(Length=2,Width=0.1);
c = customAntenna(Shape=r);

Create feed at [0 0 0] with number of edges as 1.

createFeed(c,[0 0 0],1);
show(c)

Create Feed Using 2-D Shapes

Create a waveguide shape.

wg_height = 0.0102;
wg_length = 0.024;
wg = shape.Box(Length=wg_length,Width=0.0229,Height=wg_height);
removeFaces(wg,3);

Create feed rectangle.

feedrect = shape.Rectangle(Length = 6e-3,Width = 6.0000e-05);
offset = -(0.5*wg_length)+6e-3;
[~] = translate(feedrect,[offset 0 -wg_height/2+(feedrect.Length/2)]);

Rotate feed rectangle by 90 degrees.

 [~] = rotate(feedrect,90,[offset 0 -wg_height/2+(feedrect.Length/2)],[offset 1 -wg_height/2+(feedrect.Length/2)]);

Create custom antenna.

ant = customAntenna(Shape=wg);

Pass feed location, number of feed edges, and feed shape to create the feed.

createFeed(ant,[offset 0 -wg_height/2],1,FeedShape=feedrect);
show(ant)
view([-24.0 -48.9])

Create Multi-Edge Feed

Create a waveguide shape.

wg_height = 0.0102;
wg_length = 0.024;
wg = shape.Box(Length=wg_length,Width=0.0229,Height=wg_height,Center=[0,0,0.5*wg_height]);
removeFaces(wg,3);

Create custom antenna.

s = shape.Circle;
s.NumPoints = 6;
s.Radius = 0.001;
wg = extrude(wg,s,Height=0.005);
ant = customAntenna(shape=wg);

Pass feed location and number of feed edges to create the feed.

createFeed(ant,[0 0 0],6);
show(ant)
view([-19.3 -18.8])

Input Arguments

antenna — Custom antenna

customAntenna object (default)

Custom antenna to create the feed, specified as a customAntenna object.

Example: customAntenna(Shape=shape.Custom3D)

FeedLocation — Location of feed

[0 0 0] (default) | N-by-3 real matrix

Locations of the feed points, specified as a N-by-3 matrix of Cartesian coordinates in meters. N represents the number of feed points. See Feed Model for more details on the feed.

Example: [0 0 1]

Example: [0.01 -0.0065 2e-3;0.045 -0.0065 2e-3]

Data Types: double

NumEdges — Number of edges for feed

1 (default) | 1-by-N vector of positive integers

Number of edges for the feed, specified as a 1-by-N vector of positive integers. N represents the number of feed points.

Example: 2

Example: [1 1]

Data Types: double

Name-Value Arguments

Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

Example: FeedShape=shape.Rectangle

FeedShape — Shape of feed

shape object

Shape of feed, specified as a shape object.

Example: shape.Rectangle

Version History

Introduced in R2023b