Waveguide injecting unit

Apparatus for guiding an electromagnetic microwave, having:

• antenna surrounding walls, which at least partially define an interior space so as to surround therein at least an end region of an antenna of a microwave source;
• waveguide boundary walls, at least two of which are arranged parallel to each other, wherein the waveguide boundary walls form a waveguide having a cross-section shape, wherein a cross-sectional plane is defined by a first direction that extends along a longitudinal direction of the antenna and a second direction that extends perpendicularly to the first direction,
• wherein the two parallel waveguide boundary walls are aligned perpendicular to the first direction and are located at a distance along the first direction,
• wherein said antenna extends from a base region to the end region,
• wherein a first one of the two waveguide boundary walls that are arranged in parallel extends at the base region,
• wherein a second one of said two waveguide boundary walls that are arranged in parallel extends between the base region and the end region of said antenna,
• wherein it holds:
• 25>a/b>3,
• wherein
• a:
• is a width of the waveguide along the second direction,
• b:
• a height of the waveguide along the first direction,
• wherein the apparatus is designed to let proceed a microwave from the interior space of the antenna surrounding walls into the waveguide,
• wherein one of the following holds:
• the two parallel waveguide boundary walls are at least partially connected by at least one rounded off waveguide boundary wall;
• a third and a fourth waveguide boundary wall of the waveguide boundary walls are arranged parallel to each other, are oriented perpendicularly on the first one and the second one of the waveguide boundary walls, and connect the first waveguide boundary wall to the second waveguide boundary wall such that the cross-section shape of the waveguide is rectangular.