LFB182G45SG9A272 filter

[Ammar]

I am using this filter in the image shown below. The bluetooth link is bidirectional, but it will be receiving much more data than it is transmitting. Is the direction in the application note set correctly? What would happen if the "in" of the filter were facing the chip and the "out" was facing the antenna?

The datasheet for the filter doesn't say much about what is going on internally.

[RadioNerd]

The large majority of HF filters is usually almost petfectly reciprocal, i.e. S21 = S12. There might be some minor differences in return loss or power handling (the port defined as IN is usually slightly better) but this can be neglected in 99% of the cases