I'm designing a board which uses a chip antenna. According to the datasheet, there should be no copper on all layers under the antenna. There's also should be some ground plane on the top layer with a know distance between the plane and the chip.
My question is : what about power and bottom layers ? Should I add a ground band around the clear area or should I just do nothing ?
Datasheet : http://www.mouser.com/ds/2/276/0479480001_ANTENNAS-701294.pdf (link to app notes and other relateds in the top of the datasheet)