RF Bandpass filters are used in both wired andwireless communications systems, sensor applications, instrumentation, medical applications, and many others. 

When it comes to these types of applications, the goal is to pass signals of interest from point A to point B, while reducing noise and unwanted radiation from the signal source, other equipment, and the environment. 

Often different bandpass filters can be combined in a switched filter bank (see figure) that integrate the filters and switches, thereby providing better insertion loss, flatness, VSWR, and overall better performance of the device.

RF Filters have vary types:such as Low Pass Filter, High Pass Filter, Band Pass Filter, Band Stop Filter, Diplexers and Triplexers