BANDPASS FILTER TYPES
Filter Type 1
This is also known as a single-cavity filter. It is characterized by an extremely narrow peak and gradual sideband slopes.
Filter Type 2
This is also known as a two-cavity filter. It is characterized by a rounded peak.
Filter Type 3
This is also known as a three-cavity filter. It is characterized by a square peak and fairly steep sideband slopes.
Filter Type 4
This is also known as a four-cavity filter. It is characterized by very steep sideband slopes and a square but wavy peak.
Filter Type 5
This is also known as a five-cavity filter. It is characterized by very steep sideband slopes and a square but wavy peak.
Filter Type 6
This is the same bandshape as a filter type 2 but does not include any additional out-of-band blocking. It is also referred to as a "spike" filter.