Band-pass filter

A band-pass filter comprising:

• a main body formed of a dielectric;
• a first input/output port and a second input/output port integrated with the main body;
• and
• five or more resonators provided within the main body, located between the first input/output port and the second input/output port in circuit configuration, and configured so that electromagnetic coupling is established between every two of the resonators adjacent to each other in circuit configuration, wherein
• each of the five or more resonators includes a resonator conductor portion formed of a conductor,
• the five or more resonators include:
• a first resonator and a second resonator that are configured to be magnetically coupled to each other although not adjacent to each other in circuit configuration;
• and a third resonator and a fourth resonator that are configured to be capacitively coupled to each other although not adjacent to each other in circuit configuration,
• the first resonator and the third resonator are adjacent to each other in circuit configuration,
• the second resonator and the fourth resonator are adjacent to each other in circuit configuration,
• the resonator conductor portion of the first resonator and the resonator conductor portion of the second resonator are physically adjacent to each other without any resonator conductor portion of another resonator therebetween,
• the resonator conductor portion of the third resonator and the resonator conductor portion of the fourth resonator are physically adjacent to each other without any resonator conductor portion of another resonator therebetween,
• the resonator conductor portion of the first resonator and the resonator conductor portion of the third resonator are physically adjacent to each other without any resonator conductor portion of another resonator therebetween, and
• the resonator conductor portion of the second resonator and the resonator conductor portion of the fourth resonator are physically adjacent to each other without any resonator conductor portion of another resonator therebetween.