How to put a capacitance in parallel to a port in CST

Hello everybody,

My problem is very simple, I just want to put a capacitance as lumped adaptive element IN PARALLEL with respect to the generator (discrete port). I know that exists the macro->construct->discrete port with lumped element, but this macro allows only to put a SERIES element with the port.

Another way I thought it were correct is to put a lumped element between the same to points defined for the discrete port, but this solution doesn't work because the CST told me: "the discrete port has the same mesh location as the lumped element" and the simulation aborted.

Can someone help me please?

Thank you in advance for the answers!

Regards,

Luca

Ciao Luca,

Just go to pick two points, the same you selected for putting the port. Then there is an icone of lumped elements where you choose L,C or resonant circuit.

I hope it helps.

Ciao Enrico!

Thanks for the answer, but as I have written in the first post, if you put a lumped element in the same points as the port, then CST give me an error: "the lumped element has the same mesh location as the port"

regards,
Luca

Luca,

If you place it very close to the points you also placed the ports, it should not introduce discrepancies. It most likely you are using same and a "coarse" mesh where you have the port, try to increase mesh in these area assigning it and changing the "local mesh properties, also extend it few millimeters on each axes.

By the way what is the purpose to superimpose the lumped element and port ?

If you don't need it in the simulation domain for radiation analysis, moreover the s-paramters results, alternatively you can export the 1D Results to any simulator (even own CST Studio) and place a parallel component.

I hope it helps and let me know if you need any help.

Ok, I will try!

I want to do it because I am measuring a farfield at a certain distance from a small loop antenna which is not self-resonant with a probe and if the antenna is not matched, what I measure is a very small value.

just I am here, I have another question for you, since you look to be very prepared!

I want to simulate the farfield pattern of this famous loop antenna, but it is put inside a radome and the radome is inside a pipe full of water. I just want to simulate an infinite pipe, so I have used a Perfect Matching Layer PML using open boundaries at the edges of the pipe, while I have used open boundaries (add space) in the other directions. i cannot use open boundaries with add space at the edges of the pipe because otherwise the gap of material (water->freespace) makes the pipe to be resonant and the S-parameter is not real.

What I have obtained is a farfield with directivity less than one in the maximum direction. That is impossible! I have tried anythink without success...any suggestions?

Thank you Enrico,

have a nice time,

Luca

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