Filter circuits having acoustic wave resonators in a transversal configuration

A filter circuit, comprising:

• a first circuit port;
• a second circuit port;
• a first filter branch connected between the first circuit port and the second circuit port, the first filter branch comprising:
• a first plurality of parallel acoustic wave resonators transverse to the first circuit port and the second circuit port;
• and
• a plurality of series capacitances, each connected in series with a respective parallel acoustic wave resonator of the first plurality of parallel acoustic wave resonators;
• and
• a second filter branch connected between the first circuit port and the second circuit port and comprising a second plurality of parallel acoustic wave resonators transverse to the first circuit port and the second circuit port;
• wherein the second filter branch has a phase shift from the first filter branch.

A filter circuit, comprising:

• a first circuit port;
• a first filter branch connected between the first circuit port and a first differential node and comprising a first plurality of parallel acoustic wave resonators;
• a second filter branch connected between the first circuit port and a second differential node and comprising at least one acoustic wave resonator;
• and
• a phase shift circuit connected between the second differential node and a second circuit port;
• wherein:
• the first differential node is connected to the second circuit port;
• and
• the phase shift circuit provides between a 160 degree and 200 degree phase shift from the first filter branch.