Horn antennas with integrated feed networks

A method, comprising:

• forming a horn antenna array in a single workpiece of material comprising horn antenna elements with integrated feed networks;
• wherein forming each of the integrated feed networks comprises:
• forming a waveguide interface flange having a port;
• forming a filter element having a serpentine cavity coupled to the port that is at least partially formed by a base section, wherein a separation interface is established between the base section and an attachable cap that forms a remainder of the serpentine cavity;
• and
• forming a polarizer element having a waveguide cavity that couples between the serpentine cavity of the filter element and an associated horn antenna element;
• and
• wherein forming each of the horn antenna elements comprises:
• forming a horn structure;
• and
• forming a signal aperture.

An apparatus, comprising:

• a horn antenna assembly formed in a single workpiece of material comprising a horn antenna element and an integrated feed network;
• the integrated feed network comprising:
• a waveguide interface flange comprising a port;
• a filter element comprising a serpentine cavity coupled to the port and is at least partially formed by a base section, wherein a separation interface is established between the base section and an attachable cap that forms a remainder of the serpentine cavity;
• a polarizer element comprising a waveguide cavity that couples between the serpentine cavity of the filter element and a horn antenna element comprising a signal aperture.