Abstract: A radar high frequency module having at least one distance piece mounted at the flat top wall of the shielding cover for supporting the shielding cover on the printed circuit board without mechanical contact of the downwardly extending side walls of the shielding cover with the printed circuit board to allow alignment of a rod antenna to a patch antenna arranged on the printed circuit board with greater precision. The side walls may be fixed to the printed circuit board by a conductive adhesive.

Abstract: A radar high frequency module having at least one distance piece mounted at the flat top wall of the shielding cover for supporting the shielding cover on the printed circuit board without mechanical contact of the downwardly extending side walls of the shielding cover with the printed circuit board to allow alignment of a rod antenna to a patch antenna arranged on the printed circuit board with greater precision. The side walls may be fixed to the printed circuit board by a conductive adhesive.

Abstract: A radar level gauge for measuring a level of a surface of a product in a container has an antenna for transmitting microwaves to the surface and receiving microwaves reflected by the surface, a measurement circuitry for generating said microwaves to be transmitted and for evaluating said received microwaves, a hollow waveguide between the antenna and the measurement circuitry, said waveguide being separated by a gap into a first waveguide member coupled to the antenna and a second waveguide member coupled to the measurement circuitry, and a dielectric barrier arranged in said gap. A dielectric barrier which is simpler in construction and less critical with respect to the wavelength of the microwaves is obtained in that the dielectric barrier comprises a shaft member inserted into the hollow waveguide and extending through at least a portion of the first waveguide member, through the gap and through at least a portion of the second waveguide member.

Abstract: A timebase is provided by a circuit including an optical source emitting a light beam which is detected and integrated by an optical detector/integrator to give an output when the integrated value reaches a preset value. The optical source is a laser or LED. The optical detector/integrator is a photon counter.

Abstract: A radar level gauge for measuring a level of a surface of a product in a container has an antenna for transmitting microwaves to the surface and receiving microwaves reflected by the surface, a measurement circuitry for generating said microwaves to be transmitted and for evaluating said received microwaves, a hollow waveguide between the antenna and the measurement circuitry, said waveguide being separated by a gap into a first waveguide member coupled to the antenna and a second waveguide member coupled to the measurement circuitry, and a dielectric barrier arranged in said gap. A dielectric barrier which is simpler in construction and less critical with respect to the wavelength of the microwaves is obtained in that the dielectric barrier comprises a shaft member inserted into the hollow waveguide and extending through at least a portion of the first waveguide member, through the gap and through at least a portion of the second waveguide member.