Patent ID: 8187445

Claim:
A process for manufacturing a monobloc microwave source with a polarizer, the microwave source operating in a frequency band of 7.25 GHz to 8.4 GHz, the polarizer comprising a thick plate and a waveguide, the process comprising the following steps: electroforming the monobloc microwave source and the polarizer, wherein the thick plate has a thickness of at least 1 mm and comprises four steps of length l 1 , l 2 , l 3 and l 4 and of height h 1 , h 2 , h 3 and h 4 respectively, the thick plate having a width H and a setback D chosen to compensate for the thickness of the thick plate, said waveguide having a dimension C corresponding to an output of the waveguide, a dimension A corresponding substantially to half the width of the waveguide taken in its widened portion, a dimension B corresponding to the height of said waveguide; fixing the dimension C of the output so that only a chosen fundamental mode of the output is in the useful bandwidth of the microwave source; selecting a predetermined dimension for the setback D; and iterating the following steps until a predetermined performance level of the microwave source is achieved: selecting the dimension A by means of the setback D and the height B of the waveguide so that the guide of cross section (2*A+H, B) propagates only the fundamental mode in the bandwidth; determining the height or the length of the steps of the thick plate, so as to obtain performance levels of the microwave source that are fixed by a given application; and modifying the setback D and repeating the steps of selecting the dimension A and determining the height or the length until the predetermined performance level is achieved.