Mimo antenna terminals and parameters design

could anyone telll me the parameters of mimo antenna...and what is the range or value respective to return loss.

There is a param to describe the far field dependency.
Others almost same.
What's your application?
For mobile phone, maybe the MIMO pattern concerned.
For mobile antenna, VSWR should be less than -6dB.

Application For the USB Dongle application. 2.5-2.7GHz...

For microstrip MIMO antenna which book shoulb be used ?