Waveguide window/seal

A satellite ground station antenna, comprising:

• a hub comprising:
• a first connecting member body,
• a first circular waveguide extending through the hub coaxial with the first connecting member body and terminating at a first port at an end face of the first connecting member body,
• a first window/seal to seal the first port, and
• two or more pins extending radially from the first connecting member body;
• and
• a front-side feed network comprising:
• a second connecting member body comprising a cavity configured to fit over the first connecting member body, and two or more slots disposed around a perimeter of the cavity, each of the two or more slots configured to accept one of the two or more pins extending from the first connecting member body,
• a second circular waveguide coaxial with the cavity and terminating at a second port within the cavity,
• a second window/seal to seal the second port,
• a cap configured to fit over the second connecting member body, the cap including two or more L-shaped slots, each L-shaped slot to engage one of the two or more pins extending from the first connecting member body through the slots of the second connecting member;
• and
• a wave spring between an inside surface of the cap and a shoulder of the second connecting member body, the spring effective to urge the second port towards the first port when the two or more L-shaped slots of the cap are engaged with the two or more pins,
• wherein the first and second window/seals each comprise:
• a right-circular cylindrical window having an axis;
• an annular rib surrounding and coaxial with the cylindrical window, an outer diameter of the annular rib configured to fit closely within an inside diameter of the respective circular waveguide;
• and
• an annular recess between the cylindrical window and the annular rib.