| 摘要 |
1. An apparatus for transmitting radio-frequency signals using a signal generation unit, a signal line, a radiating element and a waveguide which is terminated in an end region by a back wall, where the signal generation unit generates the radiofrequency signals, where the signal line routes the radio-frequency signals to the radiating element of the waveguide, and where the radiating element projects into the waveguide, wherein the radiating element (4) is arranged at an angle to the back wall (6) of the waveguide or to a plane of the waveguide (5) which is parallel to the back wall (6). 2. The apparatus as claimed in claim 1, wherein the radiating element (4) is routed through the back wall (6) of the waveguide (5). 3. The apparatus as claimed in claim 1, wherein the radiating element (4) is routed through the side wall (8) of the waveguide (5). 4. The apparatus as claimed in claim 1, 2 or 3, wherein the size of the angle between the radiating element (4) and the back wall (6) of the waveguide (5) or a plane parallel to the back wall (6) of the waveguide (5) is greater than 4 degree . 5. The apparatus as claimed in claim 1 or 4, wherein the radiating element (4) is a transmission wire. 6. The apparatus as claimed in claim 5, wherein a transmission head (28) is arranged in the region of the free end of the transmission wire (4). 7. The apparatus as claimed in claim 1 or 2, wherein the radiating element (4) is a conductor structure which is arranged on a printed circuit board, and wherein the radiating structure is arranged on the printed circuit board at an angle to the back wall (6) of the waveguide (5) or to a plane which is parallel to the back wall (6) of the waveguide (5). 8. The apparatus as claimed in claim 1, wherein the waveguide (5) is routed to a horn antenna (16), a rod antenna (15) or a parabolic antenna. 9. The apparatus as claimed in claim 1 or 8, wherein a dielectric material (10; 18) is provided which fills up at least the interior of the waveguide (5) in the region of the radiating element (4). 10. The apparatus as claimed in claim 9, wherein the dielectric material (10; 18) contains a recess (14) into which the radiating element (4) projects. 11. The apparatus as claimed in claim 9 or 10, wherein the dielectric material (10; 18) is polytetrafluoroethylene (PTFE) or aluminum trioxide (Al2O3). 12. The apparatus as claimed in one or more of claims 1 to 11, wherein the apparatus is part of a level-measuring instrument (29).
|
