Telit Wireless Solutions LN940 WWAN M.2, Руководство пользователя

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Figure 3.3.5 DPR on host design recommendation
Tunable Antenna Interface
In the notebook platforms since the WWAN antennas are usually located on
the top of the lid there is a long RF mini-coax cable that can be up to 60cm
long between the antennas and the WWAN M.2 module. It’s preferred to use
switches/tunable components directly on the antenna for antenna band
switching or tuning for efficiency improvement.
Four GPIO pins are available on the host interface that can be connected to an
external antenna switch, to load the antenna with different impedances, and to
configure the different frequency responses for the main antenna
Table 3.4-1 Tunable Antenna GPIO interface
Signal Name Pin Voltage
Level Description
ANTCTL0 59 1.8V Antenna Control 0
ANTCTL1 61 1.8V Antenna Control 1
ANTCTL2 63 1.8V Antenna Control 2
ANTCTL3 65 1.8V Antenna Control 3