Redpine Signals Inc. Proprietary and Confidential
Page 13
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Chip Antenna Layout Recommendations
The choice of antenna will depend on the application. However, some recommendations are listed below if an on-chip
antenna is desired to be used:
a.
Antenna Factor ANT-2.45-CHP or equivalent.
b.
Rainsun AN3216
Please make sure that the Cu is etched out in all the Layers in the Antenna region. The Ground plane should be removed
from under & either sides of the antenna. Please follow the rules listed in the picture below while doing the layout for the
chip Antenna. Removing the ground plane from the underneath the antenna is very important.
Figure 4 Antenna layout
The chosen Chip Antennae are
λ
/4 antennae and would require external ground plane for proper functioning and the length of
the ground plane behind the antenna (from the feedpoint of antenna to backwards) should be atleast 1 or 2 inches.
Interms of feedtrace which does not have ground underneath (3mm length), it will be resonant part of the antenna and lower
its frequency. This can be a useful tuning method although this kind of short trace should have little effect which can be
observed on a Network Analyzer. It is recommended to characterize the antenna portion using a Network Analyzer.
