Band-pass filter

A band-pass filter comprising:

• an unbalanced port;
• a first balanced port;
• a second balanced port;
• and
• a first resonator, a second resonator, and a third resonator provided between the unbalanced port and the first and second balanced ports in a circuit configuration, wherein
• the second resonator and the third resonator each are a resonator with both ends open, and are adjacent to each other in the circuit configuration and electromagnetically coupled by magnetic coupling as main coupling, and
• the first resonator is provided closer to the second resonator than to the third resonator in the circuit configuration, and jump-coupled to the third resonator.