ArbitraryFiniteGapFeed
Description
Use the ArbitraryFiniteGapFeed
object to create and specify the
FeedDefinitions
property in a parent pcbComponent
object.
Creation
Description
f1=ArbitraryFiniteGapFeed
creates a default
ArbtraryFiniteGapFeed
object.
f1=ArbitraryFiniteGapFeed(
sets
object Properties using one or more
name value arguments. Properties not set retain their default value.Name=value
)
Properties
SignalLocations
— Signal locations of the feed
[-0.01,0]
(default) | N-by-2 | array
Specifies the locations that require positive excitation, as an array of size N-by-2 in meters.
The first and the second columns correspond to the X and Y coordinates in meters, respectively. Each location must lie on the edge of a metal layer.
Example: f1=ArbitraryFiniteGapFeed;f1.SignalLocations=[-0.2 0]
Data Types: double
GroundLocations
— Ground locations of the feed
[-0.01,0]
(default) | N-by-2 | array
Specifies the locations that require negative excitation as an array of size N-by-2 in meters.
The first and the second columns correspond to the X and Y coordinates in meters, respectively. Each location must lie on the edge of a metal layer.
Example: f1=ArbitraryFiniteGapFeed;f1.GroundLocations=[-0.2
0]
Data Types: double
SignalWidths
— Width of each positive excitation site
0.005
(default) | N-by-1 array
Specifies the widths of the signal locations, in meters, as an N-by-1 array.
The metal edge on which the SignalLocations(n,:)
lie must be
longer than, or equal to, the SignalWidths(n)
.
Example: f1=ArbitraryFiniteGapFeed;f1.SignalWidths=.007
Data Types: double
GroundWidths
— Width of each negative excitation site
0.005 (default) | N-by-1 array
Specifies the widths the negative excitation sites, in meters, as an N-by-1 array.
The metal edge on which the GroundLocations(n,:)
lie must be
longer than, or equal to the GroundWidths(n)
.
Example: f1=ArbitraryFiniteGapFeed;f1.GroundWidths=0.007
Data Types: double
SignalLayers
— Board layers for all positive excitation sites
1
(default) | N-by-1 array
Specifies the board layers for all positive excitation sites as an N-by-1 array.
Example: f1=ArbitraryFiniteGapFeed;f1.SignalLayers=2
Data Types: double
GroundLayers
— Board layers for all negative excitation sites
3 (default) | N-by1 array
Specifies the board layers for all negative excitation sites as an N-by-1 array.
Example: f1=ArbitraryFiniteGapFeed;f1.GroundLayers=4
Data Types: double
Examples
Arbitrary Finite Gap Feed Setup for a Coplanar Port
This example shows how to configure an ArbitraryFiniteGapFeed to excite a coplanar waveguide with no conductor backing implemented as a pcbComponent object.
Set up three rectangles in a coplanar waveguide configuration.
w = 3e-3; % width of the strip (m) s = 0.2e-3; % spacing from strip to ground planes (m) t = 1e-3; % substrate thickness boardWidth = 4*w; % Total width of the board (m) boardLength = 10*w; % Length of the trace and all GPs (m) d = dielectric('Teflon'); d.Thickness = t; rect1 = traceRectangular('Length', boardLength, 'Width', boardWidth); rectCut1 = traceRectangular('Length', boardLength, 'Width', s, 'Center', [0, (s/2+w/2)]); rectCut2 = copy(rectCut1); rectCut2.Center = -rectCut1.Center; p = pcbComponent; p.BoardShape = rect1; p.BoardThickness = t; p.Layers = {rect1 - rectCut1 - rectCut2, d};
Switch the pcbComponent's FeedFormat property to 'FeedDefinitions' to expose its FeedDefinitions property, and configure one ArbitraryFiniteGapFeed at each end of the coplanar waveguide. Each property of a given ArbitraryFiniteGapFeed requires two rows in this case. All properties' first rows together will define the first +/- excitation pair - that is, the excitation of the strip against the right ground plane. All properties' second rows together will define the second +/- excitation pair: the strip against the left ground plane.
p.FeedFormat = 'FeedDefinitions'; f1 = ArbitraryFiniteGapFeed('SignalLocations', [-boardLength/2 0; -boardLength/2 0], 'GroundLocations', [-boardLength/2, (w+s); -boardLength/2, -(w+s)], 'SignalWidths', [w;w], 'GroundWidths', [w; w], 'SignalLayers', [1; 1], 'GroundLayers', [1, 1]); f2 = copy(f1); f2.SignalLocations = -f1.SignalLocations; f2.GroundLocations = -f1.GroundLocations; p.FeedDefinitions = [f1; f2]; figure; show(p)
Compute and plot S-parameters for the waveguide.
s = sparameters(p, linspace(1e9, 5e9, 51)); figure; rfplot(s)
Version History
Introduced in R2024b
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