| 摘要 |
In order to measure the liquid level in a tank with the aid of a microwave transmitting/receiving device and a waveguide extending into the tank, it is suggested that the waveguide be designed for a precise and scalable measuring of the filling level, in such a way that it has clear and constant wave propagation characteristics for a wave with the operating frequency of the microwave device. In particular, this is achieved by dimensioning the cross section of a hollow conductor in such a way that the operating frequency lies in the unambiguous range of the hollow conductor.
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