Abstract: A very wide pass band polarization diplexer having a power divider, a transition element and a wave guide containing an impedance adapter, and applicable to all devices requiring the use of a wave guide in which two waves in orthogonal modes propagate.

Abstract: A wide-band microwave antenna capable of radiating over a wide angular field is fed by a rectangular wave guide and includes a first sectoral horn coupled to the rectangular wave guide. The first sectoral horn is sectoral in the H plane. Coupled to the first sectoral horn is a second sectoral horn which is sectoral in the E plane. The second sectoral horn has a partial-cylindrical-shape with circular-shaped outer edges. The second sectoral horn has a top plate and a bottom plate. A plurality of equally spaced power distributors are radially disposed in the second sectoral horn and extend from the top plate to the bottom plate through the entire length of the second sectoral horn. These power distributors thus form a plurality of elementary radiation sources.

Abstract: The invention relates to furnaces equipped with an insulating inner lining formed from fibers. The object of the invention is to reduce the thermal discontinuities at the level of the orifice tube of the burner. For this purpose, the orifice tube consists of blankets of fibers arranged radially round the burner and compressed to a greater extent in the inner part facing the axis of the burner than in the outer part. The density in the inner part preferably reaches 300 to 400 kg/m.sup.3.