Horn antenna device

An antenna system, comprising:

• a printed circuit board;
• at least one first horn antenna device that includes:
• a plastic body comprising a top face, a bottom face opposing the top face, and lateral faces adjoining the top face and the bottom face;
• and
• a cavity formed in the plastic body, wherein the cavity comprises a cavity opening formed at the top face of the plastic body, wherein the cavity is at least partially coated with a metal layer to form a horn antenna for radiating microwaves through the cavity opening;
• wherein a first portion of the lateral faces is coated with a metal layer, and a second portion of the lateral faces is exposed with the plastic of the plastic body, wherein the first portion of the lateral faces substantially blocks radiation within the plastic body and the second portion of the lateral faces allows radiation to pass through the plastic body;
• and
• wherein the at least one first horn antenna device is mounted on the printed circuit board, the at least one first horn antenna device being configured as a receiving antenna;
• at least one second horn antenna device, the at least one second horn antenna device being configured as a transmitting antenna;
• and
• a monolithic microwave integrated circuit (MMIC) placed on the printed circuit board, the MMIC comprising a plurality of transmit channels coupled to the transmitting antenna and a plurality of receive channels coupled to the receiving antenna by feed lines.