Dielectric filter unit and dielectric filter

A dielectric filter, comprising two or more dielectric filter units, wherein each of the two or more dielectric units comprises:

• a first dielectric resonant cavity, provided with a first frequency hole in an upper end face or a lower end face of the first dielectric resonant cavity;
• and
• a second dielectric resonant cavity, connected to the first dielectric resonant cavity, and provided with a second frequency hole in an upper end face or a lower end face of the second dielectric resonant cavity;
• wherein, a coupling slot is provided at a joint of the first dielectric resonant cavity and the second dielectric resonant cavity, and two or more third frequency holes are provided at the joint of the first dielectric resonant cavity and the second dielectric resonant cavity;
• and
• wherein each of the third frequency holes has a projection area in the horizontal direction completely or partially overlaps with a projection area of the coupling slot in the horizontal direction.