I am new to RF electronics and trying to build my first circuit integrating Bluetooth Low Energy, with quite strong geometrical constraints : the whole thing needs to fit inside a narrow 8x5x60mm volume. I am thinking about using a chip antenna (e.g. Johanson 2450AT43A100) on one end of the PCB, but can't find information about the effects of having such a narrow ground plane : datasheets usually only present performance with large ground planes without saying much about the degradation we should expect if we shrink it below recommendations and theoretical limits related to wavelength.
Is there is any practical limit on the width of the PCB serving as the ground plane? For example, assuming proper tuning, should I expect a decent connectivity with this kind of antenna using a 7x40mm ground plane?
The system is intended for short range communication only, with a device less than 2m away (possibly with a human body in the middle though).
I have seen interesting patch antennas like what Apple did for their Air Plugs, but I would really like to avoid the cost of a custom antenna design for now.
Another very interesting solution I found was Insight SiP ISP 1507. Sadly it's just a bit too large for our requirements...