Feed horn sealing structure and method of sealing the feed horn

A method of producing a feed horn assembly, comprising:

• providing a tubular horn body having a first end and an opposite, second end, wherein the first end comprises a peripheral groove defined by an inner peripheral portion and an outer peripheral portion of the tubular horn body;
• placing a film on the first end of the horn body, wherein the film comprises a central portion, a peripheral bending portion and a periphery portion, and the peripheral bending portion and the peripheral portion are disposed in the peripheral groove and in contact with an inner side surface and a bottom surface of the groove;
• disposing a sealing structure in the peripheral groove, wherein the sealing structure comprises a first sealing component contacting the peripheral bending portion, the periphery portion, and a second sealing component contacting the peripheral bending portion and the first sealing component;
• fixing the film and the sealing structure;
• and
• crimping the outer peripheral portion to form a peripheral chamfer portion, wherein the peripheral chamfer portion urges against the sealing structure, such that a sealed condition is formed between the film and the inner peripheral portion.