Allen Avionics designs and manufacturers Band Reject filters designs utilize mainly Chebyshev types, but we also use Butterworth and Elliptical designs as needed. These filters are epoxy encapsulated or sealed in metal cans. See the mechanical design guide for more information. Key parameters of these filters are:

Cut-off Frequency: 500 KHz to 150 MHz

Impedance: 50 to 2.5 K Ohms

Maximum Insertion Loss: 1 to 3 dB

Maximum Ripple: 1 dB