Cassegrain Antenna Design Errors

2025 1 6
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更新时间：2026 6 4
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I'm trying to run the attached code for a Cassegrain antenna, changing the frequency from 18 GHz to the GPS frequencies 1575.42 MHz and 1227.6 MHz. I changed the frequencies and the following errors came up: "Error in em.MeshGeometry/updateMesh, Error in em.MeshGeometry/getMesh, and Error in em.EmStructures/analyze". Can you help resolve the errors?
Rp=0.3175;
fp=0.2536;
Rsub=0.033;
fhyp=0.1416;
ant=cassegrain('Radius',[Rp Rsub],'FocalLength',[fp fhyp]);
show(ant);
Exciter=design(hornConical,17.7e9);
Exciter.FeedWidth=3.4e-3;
Exciter.Tilt=270;
Exciter.TiltAxis=[0 1 0];
show(Exciter);
●
ant=reflectorParabolic('Radius',0.3175);
ant.Exciter=design(hornConical,17.7e9);
ant.Exciter.Tilt=90;
figure;
pattern(ant,18e9);
ant=cassegrain;
s=sparameters(ant,linspace(18e9,18.8e9,25));
Error using matlab.internal.capability.Capability.require (line 94)
Support for Java user interfaces is required, which is not available on this platform.

Error in waitbar (line 48)
Capability.require(Capability.Swing);

Error in em.EmStructures/analyze

Error in em.PortAnalysis/impedance (line 198)
status = analyze(obj,freq);

Error in em.SharedPortAnalysis/protectedsparameters (line 134)
Z = impedance(obj,freq,UseParallel=options.UseParallel);

Error in em.PortAnalysis/sparameters (line 48)
S = protectedsparameters(obj,freq,z0,UseParallel=options.UseParallel);
figure;rfplot(s);
figure;
impedance(ant,linspace(18e9,18.8e9,25));
current(ant,18e9,'scale','log10');
Exciter=design(horn,16.2e9);
Exciter.Tilt=270;
Exciter.TiltAxis=[0 1 0];
ant.Exciter=Exciter;
show(ant);
figure;
pattern(ant,18e9);

4 个评论
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Walter Roberson
Walter Roberson 2025-1-6
I ran the above code in R2025a (pre-release). It took a while, but it ran without error.
James Manns
James Manns 2025-1-6
Yes, it runs fine at 18 GHz. How do I change it to 1575.42 MHz and 1227.6 MHz? That's when I get the errors.
Walter Roberson
Walter Roberson 2025-1-6
I have not worked with Antenna toolbox before, so I am not sure what changes you are looking for.
When I try
pattern(ant, 1575.42e6)
pattern(ant, 1227.6e6)
or
s=sparameters(ant,linspace(1200e6, 1600e6,25));
or
impedance(ant,linspace(1200e6, 1600e6,25))
everything looks plausible when I test in R2023a.
James Manns
James Manns 2025-1-7
That's it. It runs fine now. Thanks.

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 采纳的回答

Sharath Maadam
Sharath Maadam 2026-6-4

0 个投票

Script seems to be running fine without any errors in 24b version.

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