An example of an implementation with a combined Global Positioning System (GPS) and LTE antenna is shown in GPS implementation with combined LTE and GPS antenna.
Figure 1. GPS implementation with combined LTE and GPS antenna
| Reference | Description |
|---|---|
| L1 | Antenna matching |
| L2 | Low-Noise Amplifier (LNA) input matching |
| C1 | Antenna matching |
| C2 | Antenna matching |
| C3 | LNA input matching |
| C4 | LNA input matching |
| C5 | LNA supply filtering capacitor |
| C6 | LNA supply filtering capacitor |
| C7 | 100 nF, LNA enable filtering capacitor |
| C8 | 100 pF, LNA enable filtering capacitor |
| R1 | 1 MΩ, pull-down resistor |
| U1 | LNA |
| A1 | Combined LTE and GPS antenna |
Note: As a lower loss before the LNA ensures a better sensitivity in
the GPS, routing from the antenna to the ANT and from the AUX to the
LNA input should be kept as short as possible and LNA prefilter is not recommended.
When GPS is active, the AUX can be configured to be deployed during active GPS for GPS by an AT command. For more information, see nRF91 AT Commands Reference Guide.