As shown in the figure, I am using two coaxial cables for feeding, but the settings related to the waveguide port are always wrong. My purpose is to achieve dual polarization. How to set this feeding？Thanks.
Those do not look like coaxial cables. If they are coaxial cables, then for the usual size of cable the fields at the end are not polarized, but point radially from the centre conductor. It looks as if you have not thought through what you are doing and have not modelled it properly.
I agree with Mr Malcolm White. The picture doesn't depict the coaxial cable, as I can only see the outer conductor but not the inner conductor. I can send you the CST coaxial cable model if you can share your email.
Raja Usman Tariq , Malcolm White .Mr Raja Usman Tariq and Mr Malcolm White. I'am Sorry. I deleted some structures and expressed some deviations. The yellow part in the figure is used as PEC. The green part is the same material as the dielectric substrate. There is a patch (deleted) on top of the middle yellow cylinder. It is mainly fed by two coaxial inner cores.
The main problem at the moment is a mistake in setting up these two core feeds with CST. I use the wave port to feed the power, the ground is set to 0 thickness, and the coaxial outer wall is the yellow part outside the picture. CST prompted me to use a multi-pin setup. I checked the help documentation and there was no such setup for two coaxial feeds.
I have also used HFSS for simulation, and the settings there are no problem.
I cannot understand your structure, enough to correct it, from your description.
A waveguide port feeds power into a surface with conductors and dielectric leading away on the other side.
If you have 2 coaxial ports then you need to define 2 ports. You can feed them both at the same time if you want to by defining the excitations in CST in the excitation list in the solver parameter window.
Malcolm White Combined with what you said and the help document, I changed the solver to frequency domain solver or time domain solver, which can be simulated normally, but an error will be reported when using the multilayer solver, it may be that the structure does not support this solver. Thank you for your help！
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