Band reject filter (also called a band-stop filter or notch filter) attenuates signals in the stop band and passes signals outside the stop band. Sirius Microwave’s series of lumped element and microstrip band reject filters cover stop band frequencies from a few KHz to 5GHz, while passbands extend from DC to 18GHz. These filters are available for bandwidths from 0.1% to an octave. Some examples of lumped element designs are listed in the table below. Contact factory for special requirements here.