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I think the problem is that the square in the center and the rest of the structure have only 4 edges (i.e. 4 lines) in common which are 1D objects. If you modify the structure slightly so that the middle rectangle overlaps with the rest of the structure you will be okay. Just an infinitesimal...
Basically, you can get a TEM mode between the plates BUT the energy coupled to this mode would be too small compared to the energy of the free space TEM mode (very poor coupling efficiency). This is because of the impedance mismatch as other people have already said.
Your confusion starts from...
I had a look at your files (e.g. for 0.4mm) and I noticed the following:
1. You are exciting the structure with ports, and thus you do not use the eigenmode solve as you say in the original post. The standard way to get the dispersion diagram is with the eigenmode solver (i.e. without...
Usually one needs to setup a parameter sweep (with the phase shift being the parameter). The dispersion diagram then can be found under the "tables" folder. It would be useful if you can provide some more info about your design or even better if you could upload the cst project....
Try to manually mesh denser the volume around the antenna (i.e., the air around the antenna) and the radiation boundaries as well. HFSS automatically refines the mesh where the electric field is more intense. This usually happens close to the port, therefore in order to accurately get the...
Yes, I'm Greek as well....;-)The port impedance is not 50 ohms in the software. For example when designing an antenna one makes sure that the feed line has a characteristic impedance that matches that of the transmission line that is going to be connected to. In most cases the excitation is a...
Hi,
The "characteristic impedance Z0" you are referring to is not 50ohms in a waveguide. In fact there are various ways to define it (e.g., current-voltage, power-current, power-voltage, etc). This is because in a waveguide operating in the TE/TM mode the voltage is not defined unambiguously...
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