WT Microwave Cavity Band Pass Filter WT-A11654-Q04 (1418-1422MHz)
This cavity filter from China has remarkably narrow band of only 2MHz either side of target frequency of 1420MHz (hydrogen). I received 3 of these filters December 2024.
Simulation curve from company (WT Microwave) below for this filter:
Actual test curves and test data for the three filters I received:
