Patent ID: 7227495

Claim:
A radar fill-level sensing device, incorporating a high-frequency unit that serves to generate and process radar signals of a predefined frequency and wave-length, an antenna for transmitting and/or receiving the radar signals, as well as circuitry, provided on a circuit board and including a microstrip circuit, that serves to connect the high-frequency unit to the antenna, said microstrip circuit including several ground conductors, wherein the ground conductors encompasses a first segment, a radial stub and a second segment, respectively, the length of the first segment essentially corresponds to one quarter of the predefined wavelength, said radial stub is positioned at the end of the first segment, the end of the first segment and the radial stub connect to the second segment and the second segment is grounded, wherein the ground conductors are so dimensioned especially in terms of their width that intrinsic safety is attainable only through the combination of all ground conductors.