We are developing a new version of 868MHz RF module based on SX1276 IC. I asking myself if I need to mount a SAW BPF on the RX path. On SX1276 semtech reference design there is a footprint for a SAW filter but is always replace by 0 Ohm jumper. However I read in AN 1200.04 :
“Semtech recommend that for most applications, provision be made for a SAW filter since ISM band
devices share frequency spectrum with GSM/GPRS which operates close to the 863 - 870 MHz;”
In EU this is true for GSM900 UL (876 to 915MHz) and also for LTE800 UL (832 to 862MHz).
The major advantage of SAW filter is that it will improve OoB (Out-of-band rejection) and mains drawbacks is price and additional insertion loss.
What is your opinion ?
Is there a recommended SAW filter model ?