Acoustic wave filter including two types of resonators

A method of processing a radio frequency signal, the method comprising:

• filtering at least a first transmit radio frequency signal with a first transmit filter and at least a second transmit radio frequency signal with a second transmit filter, the first and second transmit filters each including a first stage in communication with an input of a final stage, the first stage including bulk acoustic wave resonators and but not surface acoustic wave resonators, the final stage having at least a series surface acoustic wave resonator but not bulk acoustic wave resonators, an output of the final stage coupled to a common node;
• filtering first and second receive radio frequency signals with first and second receive filters, the inputs of the first and second receive filters coupled to the common node, the first receive filter including a first plurality of surface acoustic wave resonators, the second receive filter including a second plurality of surface acoustic wave resonators;
• and
• suppressing a first target signal by applying to the input of first transmit filter a first anti-phase signal to a first target signal at a first particular frequency with a first loop circuit including a third plurality of surface acoustic wave resonators coupled to the common node and the input of the first transmit filter;
• and
• suppressing the target signal by separately applying to the input of the transmit filter a second anti-phase signal with a second loop circuit including a fourth plurality of surface acoustic wave resonators coupled to an output of the first receive filter and the input of the transmit filter.