query on SMD antennas

what are the considerations to be taken while interfacing a SMD antenna on a PCB containing Bluetooth module and/or WLAN module.

Antennas don't work alone. It seems your "SMD Antenna" needs a good
ground plane. Required ground plane size can be best answered by the
antenna manufacturer.
Other than that, you will need to use a good 50 ohm transmisssion line
to maintain impedance match.