A RF module was integrated with an application. The whole system
including the RF module, antenna and application components must be put
inside a plastic box (per the users' requirement). Unfortunately, the
application components include a transformer and some other metal
components, and the box (designed beyond my control) is small, and the
antenna is very close to these metal comonents inside the plastic box
(very little room inside the box). I found the RF performance (e.g.
Tx/Rx distance) is much weaker than if the antenna is farther separated
from the the other components (for example, let the antenna stick out
of the box...). Could you make some suggestions or guidelines to deal
with this situation so that the RF performance is as good as if the
antenna is stick out of the box ....

Thanks for your help.

Jin