4.3 Antenna Placement

The following figure illustrates how to place an antenna on the motherboard and how the location affects antenna performance. It must reserve the clearance area between the ground plane and antenna, where the range extends to 2*(D2/λ) of the distance from the actual antenna entity.

Note:
  1. D is the widest dimension of the antenna perpendicular to the line of propagation, and λ is the wavelength of the carrier frequency, fc.
  2. For more details on PCB antenna design, refer to the 2.4 GHz PCB Antenna Reference Document available in the IS1870 Reference Design Package on the IS1870 website.
Figure 4-3. Antenna Placement Examples