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frequency range setting in CST

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y.ettefagh

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Hi everyone!
I would appreciate it if you guys can help me out...
I'm new to CST and i'm having a problem in setting my desired frequency bandwidth of the input signal.
I want the excitation signal to be a gaussian modulated signal (actually the default excitation) within the bandwidth of 25 ghz up to 35 ghz (in order to have a wideband signal) but when i check it in matlab with respect to the sampling frequency which is about 7 Thz i see that the two peaks of the input signal (they are gaussian modulated) are about 3.5 Thz! am i making a mistake?

Here's the code i use in matlab:

Code: 
d1=load('input1.txt');
v_ind1=d1(:,2);
f=fftshift(fft(v_ind1));
fs=1/d1(2,1);
 
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can you explain what platform of CST you are using means Microwave Studio etc as In Particle Studio of CST you can very easily define the Gaussian Signal of your choice by changing the features in pre-defined Template.
In Traniset Time and frequency domain solvers you can also edit the program in CST to change the amplitude type and frequency range of input excitation signal.
In CST MW studio you need not any excitation signal.
I am not able to understand why you are defining the input signal in MATLAB
 

thanks for your attention, my problem is solved fortunately :)
now i have another question and i would appreciate it if you answer me.
i need to run CST for many times and in each time, change the location of a solid component. can anyone tell me how to control CST? for example by linking it with MATLAB?
Thanks so much :)
 

I think if you just need to change some parameter for example dimension, frequency or anything else and need to observe the effect of this change on Response of Structure you can do this very easily by sweeping that parameter in CST .....
I am not getting why you want to link CST with MATLAB just to change one parameter
 

Thanks for your reply.
Actually i need to run CST over 200 times to get the data i want and in each time i want to change the location of a specific component. It is very hard for me to change thelocation manually more than 200 times so it would be ideal for me if i could write a code to do this and also save the results...
 

it does not matter how many times you have to run CST and you need not to change the parameter manually.
Just define it as a variable and then sweep it for all the values you need to explore CST will change the value of that variable and then run it as many times as needed and save the results.
But all that is very easy in CST I have used this to investigate the effect of change of slot length on coupling in rectangular waveguide couplers as part of my project.
I do not find any reason to use specific code or may be I am not understanding your problem
 

Thank you so much, here is my problem:
I want to insert a small brick in a bigger different brick then change the location of the smaller brick with specified epsilon in that bigger brick over than 200 times. how can i do this by using variables?
Thanks so much
 

I think it is very simple when you define the smaller brick in modeling instead of entering fixed numbers for its length, height and width define them as variables in the geometry this will give you all the flexibility to sweep any of those or all of those parameters using SWEEP tool of CST this will also change the location of brick automatically .....
 
Thank you so much, i used parameter sweep and the subsequent models are running but i can not find where the port signals of my two models are saved...? actually i need the port signals but after the parameter sweep, the whole 1D results vanish and i just can see materials!
 

Again it is simple you can see the results of sweep by using TEMPLATE BASED POST PROCESSING tab in CST where you can define the task and then results would be saved in last tab in CST TREE named TABLE.... I think if sweep is working to your choice it means you are done .......
 
Thank you so much, completely solved :)
 

Hello again... I have another very simple and primary question and hope to be solved easily as the previous one.
im working with CST2011 and in extracting port signals i cant select all of them and i have to extract them one by one. i think once i extract all of them in one single txt file but now i tried a lot but i cant do it now! is it possible to do so in CST2011 or not? also i have problem in installing the newer versions of cst :(
Thank you in advance,
 

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