Flat panel array antenna

A panel array antenna, comprising:

• a waveguide network coupling an input feed to a plurality of primary coupling cavities;
• each of the primary coupling cavities provided with four intermediate ports, each of the intermediate ports coupled to a secondary coupling cavity with four output ports, each of the output ports coupled to a horn radiator;
• the waveguide network formed on a second side of an input layer and a first side of a first intermediate layer;
• the primary coupling cavities provided on a second side of the first intermediate layer;
• the intermediate ports provided on a first side of a second intermediate layer;
• the secondary coupling cavities provided on a second side of the second intermediate layer;
• the output ports provided on a first side of an output layer;
• and
• the horn radiators provided as an array of horn radiators on a second side of the output layer.

A method for manufacturing a panel array antenna, comprising the steps of:

• providing a waveguide network coupling an input feed to a plurality of primary coupling cavities;
• each of the primary coupling cavities feeding four output ports, each of the output ports feeding a horn radiator;
• the input feed provided on a first side of an input layer;
• the waveguide network provided on a second side of the input layer and a first side of a first intermediate layer;
• the primary coupling cavities provided on a second side of the first intermediate layer;
• the output ports provided on a first side of an output layer, each of the output ports in communication with one of the horn radiators;
• and
• the horn radiators provided as an array of horn radiators on a second side of the output layer.