Radar fill level measurement device comprising radar chips on different planes of a circuit board

A radar fill level measurement device for fill level measurement or for recording a topology of a filling material surface in a container, comprising:

• a circuit board comprising a top circuit board surface and a bottom circuit board surface;
• and
• a first radar chip on the top circuit board surface and a second radar chip on the bottom circuit board surface,
• wherein the first radar chip and the second radar chip each comprise one or more transmission channels configured to generate a transmission signal, and one or more reception channels configured to receive the transmission signal that is reflected at the filling material surface,
• wherein at least one of the transmission channels of the first radar chip is connected, via a first line, to an antenna assembly for radiating the transmission signal,
• wherein at least one of the reception channels of the second radar chip is connected, via a second line, to the antenna assembly for receiving the reflected transmission signal,
• wherein the antenna assembly comprises a first waveguide configured to radiate the transmission signal towards the filling material surface,
• wherein the antenna assembly comprises a second waveguide configured to receive the reflected transmission signal,
• wherein the second waveguide comprises an end region that is positioned on the bottom of the circuit board,
• wherein the second waveguide further comprises a main region that is positioned on the top of the circuit board, and
• wherein a plurality of plated through-holes is arranged inside the circuit board, between the end region and the main region, in order to also form the second waveguide inside the circuit board.