US Patent 11056754 Filter antenna device

A filter antenna device is provided, which including a SIW filter structure, a SIW radiation structure cascaded with the SIW filter structure, 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. The SIW filter structure includes a first resonant cavity and a second resonant cavity that are stacked from top to bottom and communicate with each other.