Filter unit, antenna filter unit and radio unit

An antenna filter unit, comprising:

• a filter unit comprising
• a cavity filter comprising a hollow main body, with an inner-side surface of the main body defining a closed cavity for housing resonance elements,
• the main body is formed by joining a filter chassis part and a filter cover part covering the filter chassis part,
• wherein an outer-side surface of the filter chassis part or the filter cover part, facing a radio board that is electrically coupleable with the cavity filter, is metalized including a metal layer formed thereby and is configured as an electromagnetic compatibility (EMC) cover for blocking the radio board from electromagnetic interference, wherein the metal layer is metalized by plating on a base portion made of plastic;
• and
• an antenna unit electrically coupled with the filter unit, wherein the antenna unit comprises radiators and a feeding network that are integrally formed on an outer-side surface of one of the filter chassis part and the filter cover part, and a reflector integrally formed on an inner-side surface of the one of the filter chassis part and the filter cover part, wherein the EMC cover is integrally formed on an outer-side surface of the other one of the filter chassis part and the filter cover part.

A radio unit, comprising a radio board and a filter unit, the filter unit comprising:

• a cavity filter comprising a hollow main body, with an inner-side surface of the main body defining a closed cavity for housing resonance elements, and
• the main body is formed by joining a filter chassis part and a filter cover part covering the filter chassis part,
• wherein an outer-side surface of the filter chassis part or the filter cover part, facing the radio board that is electrically coupleable with the cavity filter, is metalized including a metal layer formed thereby and is configured as an electromagnetic compatibility (EMC) cover for blocking the radio board from electromagnetic interference, wherein the metal layer is metalized by plating on a base portion made of plastic,
• wherein the EMC cover is formed on the filter cover part, the filter cover part comprises the base portion made of plastic on which the metal layer is plated, and the EMC cover is shaped by integrally molding.