4117047
Rev 2.2
December 18, 2015
36
Product Technical Specification
Design Guidelines
3.9. Radio Frequency Integration
The AirPrime HL8518, HL8528 and HL8529 modules are equipped with an external antenna. A 50Ω
line matching circuit between the module, the customer’s board and the RF antenna is required, for
GSM feed path, as shown in the example below.
Figure 18. GSM Antenna Connection with Antenna Detection
Note:
Antenna detection circuit is optional. Rant is the equivalent DC terminating resistor of the antenna.
Rant should be close to 10K
Ω
.
