LC Network in Microchip's LoRa Gateway
That is a narrow band power divider, basically two identical L matching networks with the inputs in parallel to match from the output of the filter (U9) to the inputs of the RF sand. 

The resistor is there to improve the balance between the two halves of the thing, given that the loads are probably not really identical.

the SX1257 datasheet shows a remarkable lack of RF detail, where are the numbers for things like the RF S parameters (Nothing is really a resistive input at 1GHz), which you rather need to properly design matching networks? In fact even such useful things as IMD3 numbers are missing from the data.