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There exist no single isotropic antennas, but a simple dipole will provide you with an omni-azimuthal pattern. Perhaps a simple horizontally-oriented dipole might be adequate for your needs? See https://en.wikipedia.org/wiki/Omnidirectional_antenna . Alternatively, you could consider a low-gain horn antenna, or even just define a small area on your computational boundary as a port, and then radiate from it. You didn't mention polarization, or the angular distribution of the polarization that is of interest to you. If you are entirely not interested in the polarization, then perhaps you shouldn't be using the RF module at all, but might want to consider formulating your problem in terms of a scalar wave, like an acoustic wave. (For an acoustic wave, you can very easily generate the field distribution you mentioned.) See also https://en.wikipedia.org/wiki/Isotropic_radiator . Anyway, if you can tell the community here more about what you actually want to accomplish, you may get more helpful answers.

Thank you for your reply. I'm actually trying to recreate a dual linear polarized RFID reader, at UHF frequency as shown in the image below. The radiation pattern is circular so you should be able to see that no matter the angle. I only have RF module on my licence at work, and I cannot install anything else at the moment, but something could be done with it.

Pablo,

sounds like a circular or linear polarized patch antenna is what you want. I think there is an example in the application library.

Cheers Edgar

Indeed! The circularly polarized antenna example of the library suits me very well. I'll let you know if any other issue comes up.

Thank you!