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Monopole Antenna with ground plane infinite in CST

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renatoabner

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Hi,

I need to evaluate a model of a monopole antenna with the insertion of an infinite ground plane instead of the plane with finite dimensions. In CST i put the infinite plane in the determination of the boundary conditions with Et = 0, but in this case I have to use a discrete port instead of a waveguide port. This is the problem: The discrete port needs to be set at two points, one at the base of the monopole and the other on the ground plane, but the ground plane and monopole are at the same level (z = 0). How should I do this simulation?

Thanks.
 

I am not sure it is correct to have the groundplane and base of the monopole at the same level. This would mean the monopole is connected to the ground plane and the source voltage for exciting the monopole is always Zero? (it has been a while since i looked at monopoles so i may be mistaken)

If i remember correctly i think the gap between monopole and groundplane plays some part in optimizing the impedance match between the source and antenna impedances.
 

If your model is an antenna, you should set the boundary conditions to "add space" in all dimensions. You can see the setting of antennas in the examples of CST (Driver that installs CST ==>Program Files==>CST STUDIO SUITE==>Examples==>MWS==>Transient==>Antennas).
 

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