Patent ID: 8018300

Claim:
A band rejection filter capable of reducing harmonics comprising: a first signal end; a second signal end; a high pass filter, coupled between the first signal end and the second signal end, for performing high pass filtering on signals transmitted between the first signal end and the second signal end; and a low pass filter, coupled between the first signal end and the second signal end, for performing low pass filtering on signals transmitted between the first signal end and the second signal end, comprising: a plurality of non-magnetic-core inductors, coupled in a sequence between the first signal end and the second signal end; and a plurality of capacitors, respectively coupled between an intersection of adjacent non-magnetic-core inductors of the plurality of non-magnetic-core inductors and a ground end; wherein inductances of a first non-magnetic-core inductor of the plurality of non-magnetic-core inductors coupled to the first end and a second non-magnetic-core inductor of the plurality of non-magnetic-core inductors coupled to the second signal end are smaller than inductances of other non-magnetic-core inductors of the plurality of non-magnetic-core inductors.