I want to make 2 elements mimo antenna . in fact, my element is a monopole antenna . Some papers said it is necessary to make connection between them ground planes . is that true ? and why?
In order to make a strong reference plane for your antenna, you must do a connection for your antenna arrays, this is the reason why you see these work's ground plane is a very large one.
Without ground, how would you connect your feed to the antenna?
For mono-pole antennas, I suggest:
1-Create a large plane as your ground, and connect the antenna to the ground.
or
2- Use boundary conditions to avoid extra calculations (if your simulator supports boundary conditions). For example: if your antenna is directed toward z direction, you can consider xy plane as the ground by defining an E-field boundary condition on it. This way, you can treat the xy plane as your ground for feeding purposes.
In the ground planes of the two monopoles are not directly connected at the antenna, then during the measurements the connection will be through the outer conductors of the two cables that will be connecting the two antennas.The practical case will not be analogous to the simulated one.
If the ground planes of the two monopoles are not directly connected at the antenna, then during the measurements the connection will be through the outer conductors of the two cables that will be connecting the two antennas. The practical case will not be analogous to the simulated one.
Thanks Shobhit Saxena Sir and Khalil H. Sayidmarie Sir for sharing the article and practical implementation, respectively while simulating/measuring the MIMO antenna system. As far as my knowledge is concerned, no paper has mentioned this kind of scenario. I'll also take care of this while working on MIMO systems.
Thanks Alaa Imran for asking this question. Thanks RG team for providing us such platform where we can share our thoughts and information.