Filter antenna device

A filter antenna device, comprising:

• an Substrate Integrated Waveguide (SIW) filter structure;
• an SIW radiation structure cascaded with the SIW filter structure, wherein the SIW filter structure comprises a first resonant cavity and a second resonant cavity that are stacked from top to bottom and communicate with each other, the SIW radiation structure comprises a back cavity arranged alongside and communicating with both the first resonant cavity and the second resonant cavity, and a metal patch received in the back cavity;
• a feeding port and a first coplanar waveguide that are provided on a side of the first resonant cavity facing away from the back cavity;
• a second coplanar waveguide provided on a side of the second resonant cavity close to the back cavity;
• a transmission wire provided in the back cavity and connected to one end of the second coplanar waveguide;
• and
• a probe connecting the transmission wire with the metal patch,
• wherein the first coplanar waveguide has one end connected to the feeding port and another end opposite to an end of the second coplanar waveguide facing away from the transmission wire.