So, is this means that this dipole is horizontal and vertical polarized, means circular polarized?!!įrom other hand, let me put it is organized way by another one question. You will see same level of signal in both horizontal and vertical. Then, if you go to far field and switch to ludwig 3 (which is something I'm not sure that I understood from CST help). If you open the example in CST, it is dipole in z-direction. Let me take the same example you mentioned about dipole.
What I can't understand that how to show that in CST and what's the pattern will be for each of polarization or when we have dual polarization. I totally understand the linear and circular polarization. Your answer is absolutely fine but excite me for more questions. If you want vertical polarization then rotate the dipole by 90 degrees. For example, in the case of the dipole, with ludwig3 coordinates you will see a high level of radiation in the horizontal polarisation but a low level in the vertical this means the antenna radiates in a linear horizontal polarization. The antenna itself forces its own polarisation. Balanis (or another one).įinally, you cant choose the polarisation of an antenna port. The definition of right polarisation and left polarisation is the standard definition, see for example the book of Constantine A. You choose ludwig3 or spherical in plot properties/axes, after far field simulation in the farfield plots. I havent worked with FHSS but people I know is changing to CST (?) because its faster. However it will also radiate with lower level in the Y direction the difference between them is known as crosspolar discrimination (XPD).ĭiscrete ports should be used only when waveguide ports cant.
That means you dont need to generate a plane wave excitation to see the performance of your receiving antenna, just run a far field simulation.įor example, if you have a dipole along the x axis it will mostly radiate in the X direction. Remember that, due to the recipocal theorem, an antenna perfoms exactly in the same way as a transmitter or a receiver. Is it something from your experience or it is written somewhere? what about switching to HFSS? is it better for high frequencies design like 300 GHz patches or horns?ģ- Is it ok to check antenna polarization act by driving it with different polarization port, or just to check far field left hand and right hand results with simple port?Ĥ- You said: For the polarization, choose ludwig3 coordinates for linear polarization (vertical or horizontal) and spherical for Circularly polarised antennas.ĭo you mean during port definition? Sorry I'm new in CST world.ĥ- Do you have any idea of the meaning of left polarization and right polarization in the far field results in CST? They are almost the same for different antenna structures. I'm using 1 V/m and the propagation in z direction.ġ- It is better always to use waveguide ports.Ģ- Discrete ports give some errors in s11. I think should be some special setting for plane wave. I tried plane wave but results are much worse than waveguide port for simple horn antenna. In fact, I'd like to to check polarization effect of antennas by driving my antennas by circular or elliptical polarization signal and see the reaction. It seems you have good experience with CST.Īctually, I'm using waveguide ports and it seems no problem so far.