Patent ID: 7821445

Claim:
A radar level gauge for measuring a level of a surface of a product in a container, comprising: 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; a dielectric barrier arranged in said gap, and a shaft member inserted into the hollow waveguide and extending through at least a portion of the first waveguide member and through at least a portion of the second waveguide member, wherein the dielectric barrier comprises the shaft member, the shaft member extending through the gap so as to guide the microwaves out from the one of the waveguide members through the gap into the other one of the waveguide members.