post-filter to the RF Transceiver for demodulation.
The WLAN/BT signal goes to the Switch through the GNSS/WLAN/BT three-in-one antenna, and then
passes through the filter to the WLAN module for demodulation. At the same time, the WLAN/BT signal
can be modulated in the WLAN module, and then passes through the filter and the Switch to the
GNSS/WLAN/BT three-in-one antenna for transmission.