Variable frequency filter, radio frequency front-end circuit, and communication terminal

A variable frequency filter comprising:

• a ladder resonance circuit comprising a series arm circuit connected between an antenna-side terminal and a transmitter-side terminal, and a parallel arm circuit connected between a first node on the series arm circuit and ground, wherein the parallel arm circuit comprises a first parallel arm resonator;
• a first attenuation circuit connected between ground and a second node between the ladder resonance circuit and the transmitter-side terminal;
• and
• a second attenuation circuit connected in series between the first parallel arm resonator and ground,
• wherein the first attenuation circuit comprises:
• a second parallel arm resonator, and
• a first switch configured to selectively switch between a first state in which the second parallel arm resonator is connected to the second node, and a second state in which the first switch is open,
• wherein the second attenuation circuit comprises:
• a capacitor, and
• a second switch configured to selectively switch between a first state in which the capacitor is connected to the first parallel arm resonator, and a second state in which the first parallel arm resonator is connected to ground, and
• wherein the second switch is in the first state when the first switch is in the first state.