Redpine Signals, Inc. Proprietary and Confidential
Page 57
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NOTE
: The attached picture shows the antenna footprint details for
0.8mm thickness FR4 PCB
Figure 22: Chip Antenna Layout Recommendations
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 feed point of antenna to backwards) should
be at least one or two inches .
It is recommended to characterize the antenna portion using a Network
Analyzer. Electrical performance of any Chip antenna is influenced by the
physical characteristics of the surrounding ground plane, feed line, other
devices, and materials. This can be used as an advantage by manipulating
certain parameters to affect resonant frequency and match:
1.
Ground plane configuration
2.
Distance from antenna
3.
Topology around antenna
4.
Feed point transmission line impedance
5.
Trace width
6.
Trace length
7.
Matching Network
8.
PCB substrate thickness
9.
PCB substrate dielectric constant.