| 摘要 |
PCT No. PCT/FR89/00002 Sec. 371 Date Jul. 13, 1990 Sec. 102(e) Date Jul. 13, 1990 PCT Filed Jan. 6, 1989 PCT Pub. No. WO89/06869 PCT Pub. Date Jul. 27, 1989.The present invention is directed to a mode transformer for a microwave energy transmission circuit. This transformer is interposed between an electromagnetic wave source, operating in a predetermined frequency band, and a waveguide transmitting energy. This waveguide is excited by the electromagnetic wave source in a single chosen mode. The transformer has the shape of a conical tube whose large end is connected to the waveguide. The electromagnetic wave source is connected to the conical tube by a lateral opening. In the region of the conical tube where the excitation takes place the cross-section of the conical tube is smaller than that of the waveguide. At the center of the lateral opening, the cross-section of the conical tube is that which would be that of a waveguide of the same shape whose cut-off frequency, for the chosen mode, would be the central frequency of the working frequency band. The present invention has particular application to mode conversion in high power transmission circuits operating in the millimetric waves.
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