According to these standard:RoHS，HBTE-BPF-20180227-FS,etc,.

1,Bandpass filter

In addition to electronics and signal processing, an example of bandpass filter applications is in the field of atmospheric science. A very common example is to use bandpass filters to filter weather data within the last 3 to 10 day range, so that only a disturbance as a cyclone is retained in the data domain. There is a resonance frequency between the lower frequency band F1 and the higher shear frequency f2, where the gain of the filter is maximum and the bandwidth of the filter is the difference between F2 and F1.

2,Bandstop filter

The band stop filter is used to eliminate a single interference frequency. For example, when you live near a FM station, you will find that the signal is in a large area in this band, or at a number of frequency points in this band. Although it may be that the FM radio transmitter needs to be repaired, it is more likely to be caused by overload at the front end of your receiver.

1,Low insertion loss;

2,High inhibition;

3,High power;

4,Wide band;

5,It is small in size, light in weight and smooth in appearance.