Switch Simulation in CST

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Akbar Ali

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I am working on frequency reconfigurable antennas and simulating design in cst. I am facing problems in simulation of pin diode like dimension of pin diode, width of connecting strips...etc.
Plz see this attachment and help me to simulate switch.
 

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  • Pin diode.png
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Hi,

pictures are quite small, did you placed a port between the lead pins of your diode? If yes, you can include a model in the cst schematic editor and simulate or structure.
 
Thank you johnjoe for your reply. But I coudn't get your point. Actually I am using BAP64-02 silicon PIN diode & its size is nearly 2mm. So I just left 2mm space between two ends of antenna and directly put lumped network element over it and assign it RLC values.
I want to know is it right way to do?
**broken link removed**
 
Could not get your attachment. Lumped network element is not correct, because your diode is nonlinear. Place your ports on both sides and add in the schematic window a model between both ports and run your simulation.
 
If you have any design simulating switch then plz send me. Because I don't have any idea of schematic window.
 
At the moment I don't have any templates, but have a look in the manual and search for microwave studio co-simulation.
 

Thank you for this suggestion, it nearly resolve my problem. One thing more, I want to use spice model of diode but I couldn't get that file which is imported in spice model block.
 

You have a spice model file for your diode?
 

In CST DS help I found that " commercial SPICE simulators such as HSPICE, PSPICE, LTSPICE, etc. are not supported.This type of block imports a circuit from a file in Berkeley SPICE syntax.

I don't know how to draw spice model in berkeley syntax and where to draw.
 
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johnjoe said:
Lumped network element is not correct, because your diode is nonlinear.
Click to expand...

For PIN diodes used as a switch, it would be reasonable to simply use R for the "closed" state and C for the "open" state, instead of a non-linear model.
 
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