For simulating a dual-polarized transition, a trial with a basic patch structure with 2 orthogonal microstrip line (MSL) feeds is used to excite orthogonal modes in a Circular Dielectric Waveguide above. As both the MSL ports should act as input ports, I have tried initially with sequential excitation which gives the results (S Parameters etc) for each excitation individually.
My queries in this context are:
1) In order to know the transmission to the Waveguide port on top due to excitation of both the input ports is simultaneous excitation the only way out? (Are the results of transmission characteristics of simultaneous excitation a sum of those due to individual sequential ones)
2) Having tried out simultaneous excitation too 'F Parameter' term is obtained. Could the precise meaning of they precisely mean be clarified?
Hi Arka Halder
For simultaneous port excitation in CST, you must use the following procedure.
1. Go to time domain solver setting.
2. Select "selection" in "Source type"
3. Click on "Excitation List...".
4. Select your desire ports.
5. Active "Active" option.
If something went wrong, let me know.
Dear Arka
CST solves the structure for each port individually, so you can superpose the desire results to have a total!
Or you may use one microstrip port using a spliter with or without phase rotation to excite the Dielectric wave guide by just one port. so you will have a combined s-parameters.
regards
I would not use anything else than the simulation of the ordinary S parameters. It will solve the three ports in sequence (guess the waveguide port should need two modes assigned to it, both orthogonal). It would be analog to what you'd have in case of a network analyzer measurement.
Hi Arka Halder
For simultaneous port excitation in CST, you must use the following procedure.
1. Go to time domain solver setting.
2. Select "selection" in "Source type"
3. Click on "Excitation List...".
4. Select your desire ports.
5. Active "Active" option.
If something went wrong, let me know.
Hello i designed circular polarization yagi antenna in CST, for circular polarization yagi antenna you should define two port with 90 degree phase difference , but now i cannot do it because CST every time give me a port simulation result while i need to simulate them together, so i don't know how i can add phase difference in port setting.
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